York Millennium Ycas0130 Users Manual 201.19 NM1 (204)

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2015-02-02

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AIR-COOLED SCREW LIQUID CHILLERS
INSTALLATION, OPERATION & MAINTENANCE

New Release

Form 201.19-NM1 (204)
035-20319-000

YCAS AIR-COOLED LIQUID CHILLERS
YCAS0130 THROUGH YCAS0230
STYLE G

028971-G

60 Hz
YCAS 2 SYSTEM EPROM

031-01798-001

(STANDARD, BRINE & METRIC MODELS COMBINED)

FORM 201.19-NM1 (204)

CHANGEABILITY OF THIS DOCUMENT
In complying with YORK’s policy for continuous product improvement, the information contained in this
document is subject to change without notice. Literature updates that may occur will be printed on the
Revision Sheet and included with the Installation, Operation & Maintenance (IOM) man, which is provided
with new equipment. If not found with the manual, the current Revision Sheet containing any applicable
revisions, and the manual, can be found on the internet at www.york.com. The Renewal Parts (RP) manual
and revision sheet for this equipment can also be found at this internet site.
It is the responsibility of installing/operating/service personnel to determine prior to working on the equipment, that they have all of the applicable literature, that it is current and that the equipment has not been
modified since manufacture.

Revision Sheets are available for
the IOM and Renewal Parts

Each update will be assigned a
sequential Rev. Level with the
date it was introduced

The Description/Change will explain
the change. If necessary it will
refer the reader to an additional
supplement or bulletin.

YORK part number for the Revision
Sheet to aid manufacturing and
distribution

Web address for the Revision Sheet
035-XXXXX-XXX
www.york.com

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

IMPORTANT!

READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
This equipment is a relatively complicated apparatus.
During installation, operation, maintenance or service,
individuals may be exposed to certain components or
conditions including, but not limited to: refrigerants,
oils, materials under pressure, rotating components, and
both high and low voltage. Each of these items has the
potential, if misused or handled improperly, to cause
bodily injury or death. It is the obligation and responsibility of operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure
to comply with any of these requirements could result
in serious damage to the equipment and the property in

which it is situated, as well as severe personal injury or
death to themselves and people at the site.
This document is intended for use by owner-authorized
operating/service personnel. It is expected that this individual possesses independent training that will enable
them to perform their assigned tasks properly and safely.
It is essential that, prior to performing any task on this
equipment, this individual shall have read and understood this document and any referenced materials. This
individual shall also be familiar with and comply with
all applicable governmental standards and regulations
pertaining to the task in question.

SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to areas of potential hazard:
DANGER indicates an imminently
hazardous situation which, if not
avoided, will result in death or serious
injury.

CAUTION identifies a hazard which
could lead to damage to the machine,
damage to other equipment and/or
en vi ron men tal pollution. Usually
an instruction will be given, together
with a brief explanation.

WARNING indicates a potentially
haz ard ous sit u a tion which, if not
avoided, could result in death or serious injury.

NOTE is used to highlight additional
information which may be helpful to
you.

External wiring, unless specified as an optional connection in the manufacturer’s product
line, is NOT to be connected inside the micro panel cabinet. Devices such as relays, switches,
transducers and controls may NOT be installed inside the micro panel. NO external wiring
is allowed to be run through the micro panel. All wiring must be in accordance with YORK’s
published specifications and must be performed ONLY by qualified YORK personnel. YORK
will not be responsible for damages/problems resulting from improper connections to the
controls or application of improper control signals. Failure to follow this will void the
manufacturer’s warranty and cause serious damage to property or injury to persons.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TABLE OF CONTENTS
SECTION 1 - GENERAL CHILLER
INFORMATION & SAFETY
INTRODUCTION ...........................................................9
WARRANTY...................................................................9
SAFETY...........................................................................9
Standards for Safety ...............................................9
RESPONSIBILITY FOR SAFETY...............................10
ABOUT THIS MANUAL..............................................10
MISUSE OF EQUIPMENT...........................................10
Suitability for Application ....................................10
Structural Support ................................................10
Mechanical Strength.............................................10
General Access .....................................................10
Pressure Systems ..................................................10
Electrical...............................................................10
Rotating Parts ....................................................... 11
Sharp Edges.......................................................... 11
Refrigerants and Oils............................................ 11
High Temperature and Pressure Cleaning ............ 11
Emergency Shutdown........................................... 11
SECTION 2 - PRODUCT DESCRIPTION
INTRODUCTION .........................................................12
General Description..............................................12
Compressor...........................................................12
Evaporator ............................................................13
Condenser.............................................................13
Economizer...........................................................14
Oil Separator/System............................................14
Oil Cooling...........................................................14
Capacity Control ..................................................14
Power and Control Panel......................................14
Each power compartment contains: .....................15
The control section contains:................................15
The options sections contain: ...............................15
Microprocessor Controls ......................................15
Motor Current Protection .....................................15
Motor Protection Modules (2ACE)......................16
Current Overload..................................................16
Thermal Overload ................................................17
Current Imbalance (Loaded & Unloaded)............17
Loss of Phase........................................................17
Improper Phase Sequence ....................................17
MOTOR STARTING .....................................................22
KEYPAD CONTROLS..................................................22
Display .................................................................22
Program ................................................................23
ACCESSORIES AND OPTIONS .................................23
Multiple Point Power Connection (Standard) ......23
4

Single-Point Power Connection with Individual
Circuit Protection .................................................23
Single-Point Power Connection with Combined
Circuit Protection ................................................23
Single-Point Power Connection without Circuit
Protection ............................................................23
Control Circuit Terminal Block............................23
Building Automation System (BAS) Interface.....23
Condenser Coil Protection ..................................23
DX EVAPORATOR AND STARTER OPTIONS .........24
UNIT ENCLOSURES OPTIONS .................................24
FAN OPTIONS ..............................................................24
SOUND REDUCTION OPTIONS................................24
VIBRATION ISOLATION ...........................................24
UNIT NOMENCLATURE ............................................25
NAMEPLATE ENGINEERING DATA ........................25
PRODUCT IDENTIFICATION NUMBER (PIN) ........26
SECTION 3 - HANDLING AND STORAGE
DELIVERY AND STORAGE .......................................27
INSPECTION ................................................................27
MOVING THE CHILLER ............................................27
Lifting Weights.....................................................27
UNIT RIGGING ............................................................28
SECTION 4 - INSTALLATION
LOCATION REQUIREMENTS....................................29
OUTDOOR INSTALLATIONS ....................................29
INDOOR INSTALLATIONS ........................................29
LOCATION CLEARANCES ........................................29
COMPRESSOR FEET BOLT REMOVAL ...................30
VIBRATION ISOLATORS ..........................................31
Installation ............................................................31
SHIPPING BRACES .....................................................31
PIPEWORK CONNECTION ........................................31
General Requirements ..........................................31
WATER TREATMENT..................................................32
PIPEWORK ARRANGEMENT....................................33
CONNECTION TYPES & SIZES.................................33
EVAPORATOR CONNECTIONS ................................33
Optional Flanges ..................................................33
REFRIGERANT RELIEF VALVE PIPING ..................33
DUCTWORK CONNECTION .....................................33
General Requirements ..........................................33
ELECTRICAL CONNECTION ....................................34
POWER WIRING..........................................................34
STANDARD UNITS WITH MULTI POINT POWER
SUPPLY WIRING .........................................................34
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TABLE OF CONTENTS (CONT’D)
Units with Single-Point Power Supply Wiring ....34
115VAC CONTROL SUPPLY TRANSFORMER ........34
Remote Emergency Stop Device..........................35
CONTROL PANEL WIRING........................................35
VOLTS FREE CONTACTS ..........................................35
Chilled Liquid Pump Starter ................................35
Run Contact..........................................................35
Alarm Contacts.....................................................35
SYSTEM INPUTS.........................................................35
Flow Switch..........................................................35
Remote Run / Stop ...............................................35
Remote Print.........................................................35
Remote Setpoint Offset – Temperature ................35
Remote Setpoint Offset – Current ........................35
SECTION 5 - COMMISSIONING
PREPARATION.............................................................42
PREPARATION – POWER OFF ..................................42
Inspection .............................................................42
Refrigerant Charge ...............................................42
Valves ...................................................................42
Compressor Oil ....................................................42
Fans ......................................................................42
Isolation/Protection ..............................................42
Control Panel........................................................42
Power Connections...............................................42
Grounding.............................................................42
Overloads .............................................................42
Supply Voltage .....................................................42
Control Transformer .............................................42
Switch Settings.....................................................43
Crankcase Heaters ................................................43
Water System........................................................43
Flow Switch..........................................................43
Temperature Sensor(s)..........................................43
Control Supply .....................................................43
Programmed Options............................................43
Programmed Settings ...........................................43
Date and Time ......................................................43
Start/Stop Schedule ..............................................43
Setpoint and Remote Offset .................................43
FIRST TIME START-UP...............................................44
Interlocks ..............................................................44
System Switches...................................................44
Start-up .................................................................44
Oil Pressure ..........................................................44
Refrigerant Flow ..................................................44
Fan Rotation .........................................................44

YORK INTERNATIONAL

Suction Superheat.................................................44
Expansion Valve ..................................................44
Economizer Superheat .........................................44
Subcooling............................................................44
General Operation ................................................44
SECTION 6 - OPERATION
GENERAL DESCRIPTION ..........................................46
START-UP .....................................................................46
NORMAL RUNNING AND CYCLING.......................46
SHUTDOWN.................................................................46
SECTION 7 - TECHNICAL DATA
FLOW RATE AND PRESSURE DROP CHARTS .......48
GLYCOL CORRECTION FACTORS...........................48
TEMPERATURE AND FLOWS...................................49
PHYSICAL DATA.........................................................51
OPERATING LIMITATIONS AND SOUND POWER
DATA .............................................................................53
Electrical Data ......................................................54
Electrical Notes ....................................................62
WIRING DIAGRAM.....................................................64
ELEMENTARY DIAGRAM .........................................66
CONNECTION DIAGRAM (SYSTEM WIRING) ......77
COMPRESSOR TERMINAL BOX ..............................78
DIMENSIONS–YCAS0130-YCAS0180 (ENGLISH) .82
DIMENSIONS–YCAS0130-YCAS0180 (SI) ...............84
DIMENSIONS–YCAS0200-YCAS0230 (ENGLISH) .86
DIMENSIONS–YCAS0200-YCAS0230 (SI) ...............88
TECHNICAL DATA......................................................90
WEIGHT DISTRIBUTION AND ISOLATOR
MOUNTING POSITIONS ............................................91
INSTALLATION INSTRUCTIONS FOR VMC SERIES
AWR/AWMR AND CP RESTRAINED
MOUNTINGS..............................................................107
COMPRESSOR COMPONENTS ............................... 111
UNIT CHECKS (NO POWER)................................... 117
SYSTEM STARTUP CHECKLIST............................. 117
PANEL CHECKS ........................................................ 118
PROGRAMMED VALUES......................................... 118
INITIAL START-UP.................................................... 119
CHECKING SUBCOOLING AND SUPERHEAT .... 119
CHECKING ECONOMIZER SUPERHEAT .............120
LEAK CHECKING .....................................................120

FORM 201.19-NM1 (204)

TABLE OF CONTENTS (CONT’D)
SECTION 8 - MICRO PANEL CONTENTS
CHILLERLER CONTROL PANEL
PROGRAMMING AND DATA ACCESS KEYS ....... 122
DISPLAY AND STATUS INFORMATION KEYS .... 122
ON / OFF ROCKER SWITCH.................................... 122
PROGRAM & SETUP KEYS ..................................... 122
1. INTRODUCTION & PHYSICAL DESCRIPTION 123
1.1 General ......................................................... 123
1.2 Keypad & Display ........................................ 123
1.3 Unit (chiller) ON/OFF Switch...................... 124
1.4 Microprocessor Board .................................. 124
1.5 Ancillary Circuit Boards............................... 124
1.6 Circuit Breakers ........................................... 125
1.8 Transformers................................................. 125
1.9 Motor Protection Modules ........................... 125
1.10 EMS/BAS Controls .................................... 128
1.11 Microprocessor Board Layout.................... 130
1.12 Logic Section Layout ................................. 131
1.13 Anti-Recycle Timer .................................... 132
1.14 Anti-Coincidence Timer ............................. 132
1.15 Evaporator Pump Control........................... 132
1.16 Compressor Heater Control........................ 132
1.17 Evaporator Heater Control ......................... 132
1.18 Pumpdown (EEV) Control ......................... 132
1.19 Alarms ........................................................ 133
1.20 Run Status (chiller) .................................... 133
1.21 Lead / Lag Compressor Selection .............. 133
1.22 Economizer Solenoid Control .................... 134
2. STATUS KEY: GENERAL STATUS MESSAGES &
FAULT WARNINGS............................................... 136
2.1 General ......................................................... 136
2.2 General Status Messages .............................. 136
2.3 Unit Warnings............................................... 137
2.4 Anticipation Control Status .......................... 138
2.5 Unit Fault Status Messages .......................... 139
2.6 System Fault (SAFETY) status ................... 140
2.7 Printout on Fault Shutdown.......................... 143
3. DISPLAY KEYS & OPTION SWITCHES ............. 144
3.1 General ......................................................... 144
3.2 Chilled Liquid Temps key ............................ 144
3.3 System # Data Keys ..................................... 145
3.4 Ambient Temp Key ...................................... 145
3.5 % Motor Current key.................................... 146
6

3.6 Operating Hrs / Start Counter key................146
3.7 Options key & .............................................146
3.8 Funtion Key..................................................148
4. PRINT KEYS...........................................................149
4.1 General .........................................................149
4.2 Oper Data Key..............................................149
4.3 Operating Data – Software Version..............149
4.4 Operating Data – Remote Printout ...............151
4.5 History Key ..................................................152
4.6 Fault History Data – Local Display
Messages ......................................................152
4.7 Fault History Data – Remote Printout..........156
5. ENTRY KEYS .........................................................157
5.1 General .........................................................157
5.2 Numerical Keypad........................................157
5.3 Enter Key......................................................157
5.4 Cancel Key ...................................................157
5.5
KEYS ...............................................157
6. SETPOINTS KEYS & CHILLED LIQUID
CONTROL...............................................................158
6.1 General .........................................................158
6.2 Chilled Liquid Temperature Control ............158
6.3 Local Cooling Setpoints Key .......................162
6.4 Remote cooling setpoints Key......................162
7. CLOCK KEYS ........................................................163
7.1 GENERAL ...................................................163
7.2 SET TIME KEY ...........................................163
7.3 set schedule / holiday key.............................164
7.4 Manual Override key....................................165
8. PROGRAM KEY.....................................................166
8.1 General .........................................................166
8.2 Program Key – User Programmable Value ..166
8.3 Programming "Default" Values ....................170
8.4 Electronic Expansion Valve..........................172
8.5 EEV Operation .............................................173
8.6 EEV Programming .......................................175
8.7 EEV Troubleshooting ...................................176
8.8 Condenser Fan Control.................................177
8.9 Service Mode: Unit Setup ............................179
8.10 Sensor Calibration Charts...........................185
8.11 Control Inputs/Outputs ...............................186
8.12 ISN Control ...............................................189
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TABLE OF CONTENTS (CONT’D)
SECTION 11 - TROUBLE SHOOTING
SECTION 9 - MAINTENANCE
GENERAL REQUIREMENTS ...................................194
CONDENSER COILS .................................................194
Chiller / Compressor Operating Log ..................195
Scheduled Maintenance......................................195
ON-BOARD BATTERY BACK-UP ...........................195
OVERALL UNIT INSPECTION ................................195
COMPRESSOR UNIT OPERATION .........................196
GENERAL PERIODIC MAINTENANCE CHECKS 198
STANDARD UNITS ...................................................198
SECTION 10 - SPARE PARTS

TROUBLESHOOTING GUIDE .................................200
LIMITED WARRANTY YORK AMERICAS
ENGINEERED SYSTEMS .........................................202
WARRANTY ON NEW EQUIPMENT ......................202
WARRANTY ON RECONDITIONED OR
REPLACEMENT MATERIALS .................................202
TEMPERATURE CONVERSION CHART................203
TEMPERATURE CONVERSION CHART
ACTUAL TEMPERATURES......................................203
TEMPERATURE CONVERSION CHART
DIFFERENTIAL TEMPERATURES..........................203
PRESSURE CONVERSION CHARRT - GAUGE
OR DIFFERENTIAL...................................................203

Recommended Spares ........................................199
Recommended Compressor Oils ........................199

LIST OF TABLES
TABLE 1 – Motor Protector Dip Switch Setting ..........18
TABLE 2 – Programmable Values Table
(minimum/maximum) ...............................175
TABLE 3 – Condenser Fan Control and Fan Contactor
Data for DXST Units with 4
Fans/System .............................................178
TABLE 4 – Condenser Fan Control and Fan Contactor
Data For DXST Units With 5
Fans/System.. ...........................................178
TABLE 5 – Service Mode Programmable Values ......179

YORK INTERNATIONAL

TABLE 6 – YCAS Style G, Across the Line Start .....180
TABLE 7 – YCAS Style G, Wye Delta Start .............182
TABLE 8 - Digital Outputs..........................................186
TABLE 9 - Analog Inputs ............................................187
TABLE 10 - Digital Inputs ..........................................188
TABLE 11 - Analog Outputs........................................188
TABLE 12 – ISN Received Data .................................189
TABLE 13 – ISN Transmitted Data.............................189
TABLE 14 – ISN Operational and Fault Codes...........192

FORM 201.19-NM1 (204)

LIST OF FIGURES
FIG. 1 – COMPONENT LOCATIONS ......................... 12
FIG. 2 – SCREW COMPRESSOR................................ 13
FIG. 3 – UNIT RIGGING..............................................28
FIG. 4 – LIFTING LUGS .............................................. 28
FIG. 5 – COMPRESSOR MOUNTING........................ 30
FIG. 7 – VICTAULIC GROOVE .................................. 33
FIG. 8 – FLANGE ATTACHMENTS ........................... 33
FIG. 9 – POWER PANEL SECTION............................ 36
FIG. 10 – OPTION PANEL SECTION ......................... 37
FIG. 11 – LOGIC SECTION LAYOUT ........................ 38
FIG. 12 – LOGIC SECTION LAYOUT WITH
CONTROL PANEL LAYOUT...................... 39
FIG. 13 – CUSTOMER CONNECTIONS .................... 40
FIG. 14 – CUSTOMER CONNECTIONS .................... 41
FIG. 16 – GLYCOL CORRECTION FACTORS ..........48
FIG. 15 – FLOW RATE AND PRESSURE DROP
CHARTS ........................................................ 48
FIG. 17 – WIRING DIAGRAM –
ACROSS-THE-LINE START.......................64
FIG. 18 – WIRING DIAGRAM –
ACROSS-THE-LINE START.......................65
FIG. 19 – ELEMENTARY DIAGRAM –
ACROSS-THE-LINE START......................66
FIG. 20 – WIRING DIAGRAM –
WYE-DELTA START ................................... 68
FIG. 21 – ELEMENTARY DIAGRAM –
WYE-DELTA START ................................... 69
FIG. 22 – ELEMENTARY DIAGRAM –
WYE-DELTA START ................................... 70
FIG. 22A – POWER PANEL (SYSTEM #1)
COMPONENT LOCATIONS..................... 72
FIG. 22B – CONTROL PANEL COMPONENT
LOCATION................................................ 73
FIG. 22C – POWER PANEL (SYSTEM #2)
COMPONENT LOCATIONS..................... 74

FIG. 23 – MODEL YCAS0130 - 0180
DIMENSIONS (ENGLISH) .........................82
FIG. 25 – MODEL YCAS0200 - YCAS0230
DIMENSIONS (ENGLISH) .........................86
FIG. 26 – MODEL YCAS0200 - YCAS0230
DIMENSIONS (SI).......................................88
FIG. 27 – CLEARANCES.............................................90
FIG. 28 – CP-2-XX........................................................92
FIG. 29 – ISOLATOR DETAILS .................................93
FIG. 30 – CP-2-XX........................................................96
FIG. 31 – ISOLATOR DETAILS .................................97
FIG. 32 – CP-2-XX......................................................100
FIG. 33 – ISOLATOR DETAILS ...............................101
FIG. 34 – CP-2-XX......................................................104
FIG. 35 – ISOLATOR DETAILS ...............................105
FIG. 36 – REFRIGERANT FLOW DIAGRAM .........108
FIG. 37 – PROCESS AND INSTRUMENTATION
DIAGRAM..................................................109
FIG. 38 – COMPONENT LOCATIONS ..................... 110
FIG. 39 – COMPRESSOR COMPONENTS .............. 111
FIG. 40 – COMPRESSOR COMPONENTS .............. 112
FIG. 41 – COMPRESSOR COMPONENTS .............. 113
FIG. 42 – COMPRESSOR COMPONENTS .............. 114
FIG. 43 – COMPRESSOR COMPONENTS .............. 115
FIG. 44 – COMPRESSOR COMPONENTS .............. 116
FIG. 45 – MOTOR PROTECTION MODULE...........127
FIG. 46 – COMPONENT LAYOUT ...........................130
FIG. 47 – LOGIC SECTION LAYOUT......................131
FIG. 47A – PROCESS AND INSTRUMENTATION
DIAGRAM ...............................................135
FIG. 48 – SUCTION PRESSURE CUTOUT .............141
FIG. 49 – ENLARGED PHOTOGRAPH OF DIP
SWITCHES ON MICROPROCESSOR
BOARD.......................................................147
FIG. 50 – ELECTRONIC EXPANSION VALVE .....172
FIG. 51 – CONDENSER FAN LAYOUT FOR
DXST 2 COMPRESSOR UNITS .............177

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

GENERAL CHILLER INFORMATION & SAFETY

INTRODUCTION

YORK YCAS chillers are manufactured to the highest
design and construction standards to en sure high
performance, reliability and adaptability to all types of
air conditioning installations.
The unit is intended for cooling water or glycol solutions
and is not suitable for purposes other than those specified
in this manual.
This manual and the Microprocessor Operating
Instructions contain all the information required for
correct installation and commissioning of the unit,
together with operating and maintenance instructions.
The manuals should be read thoroughly before
attempting to operate or service the unit.
All procedures detailed in the manuals, including
installation, commissioning and maintenance tasks
must only be performed by suitably trained and
qualified personnel.
The manufacturer will not be liable for any injury or
damage caused by incorrect installation, commissioning,
operation or maintenance resulting from a failure to
follow the procedures and instructions detailed in the
manuals.

For warranty purposes, the following conditions must
be satisfied:
• The initial start of the unit should be carried out
by trained personnel from an Authorized YORK
Service Center. See Commissioning, page 42.
• Only genuine YORK approved spare parts, oils
and refrigerants must be used. Recommendations
on spare parts can be found on page 199.
• All the scheduled maintenance operations detailed
in this manual must be performed at the specified
times by suitably trained and qualified personnel.
See Maintenance Section, page 194.
• Failure to satisfy any of these conditions will
automatically void the warranty. See Warranty
Policy, page 202.
SAFETY

Standards for Safety
YCAS chillers are designed and built within an ISO
9002 accredited design and manufacturing organization.
The chillers comply with the applicable sections of the
following Standards and Codes:

WARRANTY

York International warrants all equipment and materials
against defects in workmanship and materials for a
period of eighteen months from deliveryunless extended
warranty has been agreed upon as part of the contract.
The warranty is limited to parts only replacement and
shipping of any faulty part, or sub-assembly which has
failed due to poor quality or manufacturing errors. All
claims must be supported by evidence that the failure
has occurred within the warranty period, and that the
unit has been operated within the designed parameters
specified.
All warranty claims must specify the unit model, serial
number, order number. These details are printed on the
unit identification plate.

• ANSI/ASHRAE Standard 15, Safety Code for
Mechanical Refrigeration
• ANSI/NFPA Standard 70, National Electrical Code
(N.E.C.)
• ASME Boiler and Pressure Vessel Code, Section
VIII Division 1
• ARI Standard 550/590-98, Centrifugal and Rotary
Screw Water Chilling Packages
In addition, the chillers conform to Underwriters
Laboratories (U.L.) for construction of chillers and
provide U.L./cU.L. listing label.

The unit warranty will be void if any modification to the
unit is carried out without prior written approval from
York International.
YORK INTERNATIONAL

General Chiller Information & Safety

FORM 201.19-NM1 (204)

RESPONSIBILITY FOR SAFETY

MISUSE OF EQUIPMENT

Every care has been taken in the design and manufacture
of the unit to ensure compliance with the safety requirements listed above. However, the individual operating
or working on any machinery is primarily responsible
for:

Suitability for Application
The unit is intended for cooling water or glycol solutions
and is not suitable for purposes other than those specified
in these instructions. Any use of the equipment other than
its intended use, or operation of the equipment contrary
to the relevant procedures may result in injury to the
operator, or damage to the equipment.

• Personal safety, safety of other personnel, and the
machinery.
• Correct utilization of the machinery in accordance
with the procedures detailed in the manuals.
ABOUT THIS MANUAL

The following terms are used in this document to alert
the reader to areas of potential hazard.
A Warning is given in this document
to identify a hazard which could lead to
personal injury. Usually an instruction
will be given, together with a brief explanation and the possible result of ignoring
the instruction.
A Caution identifies a hazard which could
lead to damage to the machine, damage to
other equipment and/or environmental pollution. Usually an instruction will be given,
together with a brief explanation and the
possible result of ignoring the instruction.

The unit must not be operated outside the design parameters specified in this manual.
Structural Support
Structural support of the unit must be provided as indicated in these instructions. Failure to provide proper
support may result in injury to the operator, or damage
to the equipment and/or building.
Mechanical Strength
The unit is not designed to withstand loads or stresses
from adjacent equipment, pipework or structures. Additional components must not be mounted on the unit.
Any such extraneous loads may cause structural failure
and may result in injury to the operator, or damage to
the equipment.

A Note is used to highlight additional
information which may be helpful to you
but where there are no special safety implications.

General Access
There are a number of areas and features which may
be a hazard and potentially cause injury when working
on the unit unless suitable safety precautions are taken.
It is important to ensure access to the unit is restricted
to suitably qualified persons who are familiar with the
potential hazards and precautions necessary for safe
operation and maintenance of equipment containing
high temperatures, pressures and voltages.

The contents of this manual include suggested best
working practices and procedures. These are issued for
guidance only, and they do not take precedence over
the above stated individual responsibility and/or local
safety regulations.

Pressure Systems
The unit contains refrigerant vapor and liquid under pressure, release of which can be a danger and cause injury.
The user should ensure that care is taken during installation, operation and maintenance to avoid damage to
the pressure system. No attempt should be made to gain
access to the component parts of the pressure system other
than by suitably trained and qualified personnel.

This manual and any other document supplied with
the unit, are the property of YORK which reserves all
rights. They may not be reproduced, in whole or in part,
without prior written authorization from an authorized
YORK representative.

Electrical
The unit must be grounded. No installation or maintenance work should be attempted on the electrical
equipment without first switching OFF, isolating and
locking-off the power supply. Work on live equipment
must only be carried out by suitably trained and qualified

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

personnel. No attempt should be made to gain access to
the control panel or electrical enclosures during normal
operation of the unit.
Rotating Parts
Fan guards must be fitted at all times and not removed
unless the power supply has been isolated. If ductwork is
to be fitted, requiring the wire fan guards to be removed,
alternative safety measures must be taken to protect
against the risk of injury from rotating fans.
Sharp Edges
The finning on the air cooled condenser coils has sharp
metal edges. Reasonable care should be taken when
working in contact with the coils to avoid the risk of
minor abrasions and lacerations. The use of gloves is
recommended.
Refrigerants and Oils
Refrigerants and oils used in the unit are generally nontoxic, non-flammable and non-corrosive, and pose no
special safety hazards. Use of gloves and safety glasses
are, however, recommended when working on the unit.
The build up of refrigerant vapor, from a leak for ex-

YORK INTERNATIONAL

ample, does pose a risk of asphyxiation in confined or
enclosed spaces and attention should be given to good
ventilation.
High Temperature and Pressure Cleaning
High temperature and pressure cleaning methods (e.g.
steam cleaning) should not be used on any part of the
pressure system as this may cause operation of the pressure relief device(s). Detergents and solvents which may
cause corrosion should also be avoided.
EMERGENCY SHUTDOWN

In case of emergency the electrical option panel is fitted
with an emergency stop switch CB3 (Circuit Breaker
3). Separate Circuit Breakers, CB1 (System 1) and CB2
(System 2), can also be used to stop the respective system in an emergency. When operated, CB3 removes the
electrical supply from the control system, thus shutting
down the unit.

Product Description

FORM 201.19-NM1 (204)

PRODUCT DESCRIPTION
1
2
3
4
5
6
7
8
9
10

System Fans
System 1 Power Panel
System 2 Power Panel
Control Panel
Power Entry
System 1 Compressor
Evaporator
System 2 Compressor
System 1 Condenser
Option Box

1
2

9
10

8
7
6

FIG. 1 – COMPONENT LOCATIONS

INTRODUCTION

YORK YCAS chillers are designed for water or water-glycol cooling. All units are designed to be located
outside on the roof of a building or at ground level.
The units are completely assembled with all interconnecting refrigerant piping and internal wiring, ready for
field installation.
Prior to delivery, the unit is pressure tested, evacuated,
and fully charged with refrigerant and oil in each of the
two independent refrigerant circuits. After assembly,
an operational test is performed with water flowing
through the evaporator to ensure that each refrigerant
circuit operates correctly.
The unit structure is manufactured from heavy gauge,
galvanized steel. All external structural parts are coated
with “Desert Sand” baked-on enamel powder paint. This
provides a finish which, when subjected to ASTM B117,
500 hour, 5% salt spray conditions, shows breakdown
of less than 1/8" either side of a scribed line (equivalent
to ASTM D1654 rating of “6”).
12

028971-G

All exposed power wiring is be routed through liquidtight, non-metallic conduit.
General Description
The Air Cooled Screw Chiller utilizes many components
which are the same or nearly the same as a standard
reciprocating chiller of a similar size. This includes
modular frame rails, condenser, fans and evaporator.
The chiller consists of 2 screw compressors in a corresponding number of separate refrigerant circuits, a single
shell and tube DX counterflow evaporator, economizers,
an air cooled condenser, and expansion valves.
Compressor
The semi-hermetic rotary twin-screw compressor is
designed for industrial refrigeration applications and
ensures high operational efficiencies and reliable performance. Capacity control is achieved through a single
slide valve. The compressor is a positive displacement
type characterized by two helically grooved rotors which
are manufactured from forged steel. The 60 Hz motor operates at 3550 RPM to direct drive the male rotor which
in turn drives the female rotor on a light film of oil.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Refrigerant gas is drawn into the void created by the
unmeshing of the five lobed male and seven lobed
female rotor. Further meshing of the rotors closes
the rotor threads to the suction port and progressively
compresses the gas in an axial direction to the discharge
port. The gas is compressed in volume and increased
in pressure before exiting at a designed volume at the
discharge end of the rotor casing. Since the intake and
discharge cycles overlap, a resulting smooth flow of gas
is maintained.

The compressor is lubricated by removing oil from
the refrigerant using an external oil separator. The
pressurized oil from the oil separator is then cooled in
the condenser coils and piped back to the compressor for
lubrication. The compressor design working pressure is
450 PSIG (31 bar). Each chiller receives a 300 PSIG (21
bar) low side and a 450 PSIG (31 bar) high side factory
test. A 350 watt (115-1-60) cartridge heater is located
in the compressor. The heater is temperature activated
to prevent refrigerant condensation.

The rotors are housed in a cast iron compressor housing
precision machined to provide optimal clearances for
the rotors. Contact between the male and female rotor
is primarily rolling on a contact band on each of the
rotor’s pitch circle. This results in virtually no rotor
wear and increased reliability, a trademark of the screw
compressor.

The following items are also included:

The compressor incorporates a complete anti-friction
bearing design for reduced power input and increased
reliability. Four separated, cylindrical, roller bearings
handle radial loads. Angular-contact ball bearings
handle axial loads. Together they maintain accurate rotor
positioning at all pressure ratios, thereby minimizing
leakage and maintaining efficiency. A springless check
valve is installed in the compressor discharge housing
to prevent compressor rotor backspin due to system
refrigerant pressure gradients during shutdown.
Motor cooling is provided by suction gas from the
evap o ra tor flowing across the motor. Redundant
overload protection is provided using both thermistor
and current overload protection.

• An acoustically tuned, internal discharge muffler to
minimize noise, while maintaining maximum flow
and performance.
• Discharge shutoff valve.
• A rain-tight terminal box.
• A suction gas screen and serviceable, 0.5 - 3.0
micron full flow oil filter within the compressor
housing.
Evaporator
The system uses a high efficiency Shell and Tube type
Direct Expansion Evaporator. Each of the 2 refrigerant
circuits consists of 4 passes with the chilled liquid
circulating back and forth across the tubes from one
end to the other.
The design working pressure of the standard evaporator
on the shell side is 150 PSIG (10 bar), and 350 PSIG (24
bar) for the tube (refrigerant side). The water baffles
are fabricated from galvanized steel to resist corrosion.
Removable heads are provided for access to internally
enhanced, seamless, copper tubes. Water vent and drain
connections are included.
The evaporator is equipped with a heater for protection
to -20°F (-29°C) ambient and insulated with 3/4" (19
mm) flexible closed-cell foam.
The water nozzles are provided with grooves for
mechanical couplings and should be insulated by the
contractor after pipe installation.
Condenser
The fin and tube condenser coils are manufactured
from seamless, internally enhanced, high condensing
coefficient, corrosion resistant copper tubes arranged in

FIG. 2 – SCREW COMPRESSOR
YORK INTERNATIONAL

00485VIP

Product Description
staggered rows and mechanically expanded into corrosion
resistant aluminum alloy fins with full height fin collars.
They have a design working pressure of 450 PSIG
(31 bar). Each coil is rested to 495 PSIG (34 bar).
Multiple fans move air through the coils. They are
dynamically and statically balanced, direct drive with
corrosion resistant glass fiber reinforced composite
blades molded into low noise, full airfoil cross section,
providing vertical air discharge from extended orifices
for efficiency and low sound. Each fan is located in a
separate compartment to prevent cross flow during fan
cycling. Guards of heavy gauge, PVC coated galvanized
steel are provided.
The fan motors are high efficiency, direct drive, 6-pole,
3-phase, Class- “F,” current overload protected, totally
enclosed (TEAO) type with double sealed, permanently
lubricated ball bearings.
Economizer
Economizer is a refrigerant to refrigerant, compact platetype heat exchanger to maximize chiller capacity and
efficiency by subcooling liquid refrigerant delivered to
the cooler expansion valve. Constructed of corrosion
resistant stainless steel plates formed to induce turbulent
flow and enhance heat transfer, then oven brazed and
pressure tested for reliability. Designed and constructed
with ASME and TÜV certification for 31 bar (450 psig).
UL/CSA listed.
Oil Separator/System
The external oil separator, with no moving parts and
designed for minimum oil carry-over, is mounted in
the discharge line of the compressor. The high pressure
discharge gas is forced around a 90 degree bend. Oil is
forced to the outside of the separator through centrifugal
action and captured on wire mesh where it drains to the
bottom of the oil separator and flows to the condenser
for cooling before returning to the compressor.
The oil (YORK “L” oil – a POE oil used for all refrigerant applications), which flows back into the compressor through a replaceable 0.5 - 3.0 micron oil filter,
is at high pressure. This high pressure “oil injection”
forces the oil into the compressor where it is fed to the
bearings for lubrication. After lubricating the bearings,
it is injected through orifices on a closed thread near
the suction end of the rotors. The oil is automatically
injected because of the pressure difference between the
discharge pressure and the reduced pressure at the suction end of the rotors. This lubricates the rotors as well as
provides an oil seal against leakage around the rotors to
14

FORM 201.19-NM1 (204)

assure refrigerant compression (volumetric efficiency).
The oil also provides cooling by transferring much of
the heat of compression from the gas to the oil keeping
discharge temperatures down and reducing the chance
for oil breakdown. Oil injected into the rotor cage flows
into the rotors at a point about 1.2x suction. This assures
that a required minimum differential of at least 30 PSID
(2.1 bar) exists between discharge and 1.2x suction, to
force oil into the rotor case. A minimum of 10 PSID
(0.6 bar) is all that is required to assure protection of
the compressor. Oil pressure safety is monitored as the
difference between suction and the pressure of the oil
entering the rotor case.
Maximum working pressure of the oil separator is 450
PSIG (31 bar). Oil level should be above the midpoint
of the “lower” oil sight glass when the compressor is
running. Oil level should not be above the top of the
“upper” sight glass.
Oil Cooling
Oil cooling is provided by routing oil from the oil separator through several of the top rows of the condenser
coils and back to the compressor.
Capacity Control
The compressors will start at the minimum load position
and provide a capacity control range from 10% - 100%
of the full unit load using a continuous function slide
valve. The microprocessor modulates a voltage signal to
a 3-way pressure regulating capacity control valve which
controls compressor capacity, independent of system
pressures, and balances the compressor capacity with
the cooling load. Loading is accomplished by varying
pressure through the pressure regulating capacity control
valve to move the slide valve against the spring pressure
to promote stable smooth loading.
Automatic spring return of the slide valve to the minimum load position will ensure compressor starting at
minimum motor load.
Power and Control Panel
All controls and motor starting equipment are factory
wired and function tested. The panel enclosures are
designed to IP55 and are manufactured from powder
painted galvanized steel.
The Power and Control Panel are divided into power
sections for each compressor and associated fans, a control section and an electrical options section. The power
and control sections have separate hinged, latched, and
gasket sealed doors equipped with wind struts.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Each power compartment contains:
Compressor and fan starting contactors, fan motor
external overloads, control circuit serving compressor
capacity control, compressor and fan contactor coils and
compressor motor overloads. (Fig #1, page 12)
Current transformers in the 2ACE module provide
compressor motor overload protection and sense each
phase. This protects the compressor motors from
damage due to: low current input, high input current,
unbalanced current, single phasing, phase reversal, and
compressor locked rotor.
The control section contains:
ON/OFF switch, microcomputer keypad and display,
microprocessor board, I/O expansion board, relay boards
and power supply board.
The options sections contain:
A control circuit transformer complete with service
switch providing 115/1/60 Hz power to the unit control
system.
Electrical options as described in “Accessories and
Options.”
Microprocessor Controls
The microprocessor has the following functions and
displays:
• A liquid crystal 40 character display with text provided on two lines and light emitting diode backlighting outdoor viewing.
• A color coded, 35 button, sealed keypad with sections for Display, Entry, Setpoints, Clock, Print,
Program and Unit ON/OFF.
The standard controls shall include: brine chilling,
thermal storage, automatic pump down, run signal
contacts, demand load limit from external building
automation system input, remote reset liquid temperature
reset input, unit alarm contacts, chilled liquid pump
control, automatic reset after power failure, automatic
system optimization to match operating conditions.

Motor Current Protection
The microprocessor motor protection provides high
cur rent protection to assure that the motor is not
damaged due to voltage, excess refrigerant, or other
problems that could cause excessive motor current. This
is accomplished by sending a current signal proportional
to motor current from the Motor Protector module to the
I/O Expansion board to be multiplexed and sent to the
Microprocessor Board. If the motor current exceeds
the 115% FLA trip point after 3 seconds of operation
on either Wye-Delta or ACL starters, the micro will
shut the system down and lock it out after one fault.
A manual reset of the respective system switch is
required to clear the fault and restart the system. A
thorough check of the motor, wiring, and refrigerant
system should be done before restarting a system that
has faulted on high motor current.
The micro also provides low motor current protection
when it senses a motor current less than 10% FLA.
The micro will shut the system down whenever low
motor current is sensed and will lock out a system if
three faults occur in 90 minutes. Low motor current
protection is activated 4 seconds after start on both
Wye-Delta and ACL starters to assure the motor starts,
the system doesn’t run without refrigerant, the motor
protector is not tripped, and the mechanical high pressure
cut-out is not tripped. Once the system is locked out
on Low Motor Current, it must be manually reset with
the system switch. See also Motor Protection Module
section below.
The micro senses low motor current whenever a HPCO
or Motor Protector contact opens. This occurs because
the MP and HPCO contacts are in series with the motor
contactor. Whenever either of these devices are open,
the contactor de-energizes and the motor shuts down.
Since the micro is sending a run signal to the contactor,
it senses the low motor current below 10% FLA and
shuts the system down.

The software is stored in non-volatile memory (EPROM)
to eliminate chiller failure due to AC power failure. The
Programmed Setpoints are stored in lithium battery
backed memory.

YORK INTERNATIONAL

Product Description
Motor Protection Modules (2ACE)
The mechanical motor protector is a Texas Instruments
2ACE Three Phase Protection Module (Fig. 45, page
127), provides thermal and current motor overload protection. This module also protects against phase to phase
current imbalance, over current, under current, and phase
rotation. The modules, mounted in the power panels,
utilizes a 7 segment display which provides operating
status and fault diagnostic information. The 7 segment
display will display either a stationary or a flashing alphanumeric value which can be decoded by the operator.
A list of the codes follows:

HAXXX

Normal motor OFF display. Sequentially
sweeps through the motor protection dip
switch setting.
0
Normal - no fault detected (Running)
Flashing “0” Motor off or unloaded < 5A (Running)
AC current level.
1
High current fault.
Loaded phase to phase current
2
imbalance > 17%.
Unloaded phase to phase current
3
imbalance > 25%.
4
Improper incoming phase rotation.
High motor temperature. Trip point =
5
13kW, reset = 3.25kW.
6
Communication error.
7
Unload imbalance ( > 50%)
8
Phase Loss (> 60%)
E
Out of range of RLA calibration.
Other symbols Defective module or supply voltage.
Working voltage 18 - 30 VAC, 24 VAC nominal.
Low voltage trip
= 15 VAC.

Whenever a motor protector trips, the motor protector
contacts wired in series with the motor contacts opens
and the motor contactor de-energizes causing the motor
to stop. The micro senses the low motor current and
shuts the system down. The micro will try two more
starts before locking the system out. The system locks
out because the motor protector is a manual reset
device. After the first start, the modules’ contacts

FORM 201.19-NM1 (204)

will be open preventing the motor contactors from
energizing. Power must be removed and reapplied to
reset the module. Use CB3 in the Micro Panel to cycle
power.
Current Overload
The 2ACE module design uses one integral current
transformer per phase to provide protection against
rapid current overload conditions. The module responds
to changes in current and must be calibrated using DIP
switches located on the module. Integral trip curves allow for in-rush currents during Wye-Delta, part wind,
or ACL starts without nuisance tripping.
To check the factory setting of the 2ACE module current
overload trip value. See Table 1 (pages 18 and 21).
For the location of the dip switches and determining the
ON side of the switches, refer to Figure 45, page 127. As
indicated, to place a switch in the ON position requires
pushing the switch to the left.

A switch must be pushed to the left to
place the switch in the ON position.
The numerical value for the combination of "ON" switches equals the
overload setting.
It is recommended that a YORK Service Technician or the YORK factory
be consulted before changing these
settings for any reason, since damage to the compressor could result.
Changes should never be made unless it is verified that the settings are
incorrect.
Anytime a dip switch change is made,
power must be cycled off and on to the
module to reprogram the module to the
new value.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Thermal Overload
Three PTC (positive temperature coefficient) thermistors
in the motor windings provides thermal protection. The
sensor resistance stays relatively constant at 1kΩ until
a temperature of 266°F (130°C) is sensed. The sensor
experiences a rapid rise in resistance beyond this temperature. Whenever the resistance of one of the sensors
reaches 13kΩ, +/− 3kΩ, the 2ACE module trips, which
ultimately de-energizes the motor’s pilot circuit. Reset
is manual after the motor cools and the sensor resistance
drops to 3.25kΩ, +/− 0.5kΩ.
Current Imbalance (Loaded & Unloaded)/
Loss of Phase
A 2 second delay at start-up allows for any imbalances
resulting during normal starting conditions. After this
initial delay, the 2ACE module compares the “Operating Current” to the measured half line current. The
“Operating Current” is given by 0.65 X factory overload
current setting.
An unloaded compressor condition occurs when any
measured half line current is less than the “Operating

Current.” A current imbalance exceeding an unloaded
level of 25% will result in the motor pilot circuit being
de-energized.
A loaded compressor condition occurs when any measured half line current is greater than or equal to the
“Operating Current.” A current imbalance exceeding a
loaded level of 17% will result in the motor pilot circuit
being de-energized.
Imbalance is defined as
(High Phase - Low Phase)/High Phase
Improper Phase Sequence
The 2ACE module calculates the phase sequence at
start-up using the three current transformers to determine whether the three phase sequence on the load
side of the main contactor is miswired. Upon detection
of a miswired motor load, the module will de-energize
the main contactor pilot circuit within 50 millisecond
response time.
Additional information on the 2ACE MP module may
be found on page 125.

YORK INTERNATIONAL

Product Description

FORM 201.19-NM1 (204)

TABLE 1 – MOTOR PROTECTOR DIP SWITCH SETTING

YCAS STYLE G, ACROSS-THE-LINE – 60 HZ
MODEL
NO.

130

140

0150
SYS. 1

0150
SYS. 2

0160

0170
SYS. 1

0170
SYS. 2

CHILLER
VOLT
NAMEPLATE
CODE
RLA
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58

246
214
130
107
86
267
232
140
116
93
295
256
155
128
103
265
230
139
115
92
295
256
155
128
103
321
279
169
140
112
295
256
155
128
103

NO.
LEADS
MP
PER
DISPLAY
PHASE
HA XXX
*2
2
2
1
1
*4
*2
2
1
1
*4
*4
2
2
1
*4
*2
2
1
1
*4
*4
2
2
1
*4
*4
*2
2
1
*4
*4
2
2
1

166
144
175
144
116
90
157
189
157
125
99
86
209
173
139
89
155
188
155
124
99
86
209
173
139
108
94
114
189
151
99
86
209
173
139

MOTOR PROTECTOR
DIP SWITCH SETTINGS ON MP (“1” INDICATES ON)
128
1
1
1
1
0
0
1
1
1
0
0
0
1
1
1
0
1
1
1
0
0
0
1
1
1
0
0
0
1
1
0
0
1
1
1

64
0
0
0
0
1
1
0
0
0
1
1
1
1
0
0
1
0
0
0
1
1
1
1
0
0
1
1
1
0
0
1
1
1
0
0

32
1
0
1
0
1
0
0
1
0
1
1
0
0
1
0
0
0
1
0
1
1
0
0
1
0
1
0
1
1
0
1
0
0
1
0

16
0
1
0
1
1
1
1
1
1
1
0
1
1
0
0
1
1
1
1
1
0
1
1
0
0
0
1
1
1
1
0
1
1
0
0

8
0
0
1
0
0
1
1
1
1
1
0
0
0
1
1
1
1
1
1
1
0
0
0
1
1
1
1
0
1
0
0
0
0
1
1

4
1
0
1
0
1
0
1
1
1
1
0
1
0
1
0
0
0
1
0
1
0
1
0
1
0
1
1
0
1
1
0
1
0
1
0

2
1
0
1
0
0
1
0
0
0
1
1
1
0
0
1
0
1
0
1
0
1
1
0
0
1
0
1
1
0
1
1
1
0
0
1

1
0
0
1
0
0
0
1
1
1
0
1
0
1
1
1
1
1
0
1
0
1
1
1
1
1
0
0
0
1
1
1
1
1
1
1

* Indicates one lead/phase through motor protector.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TABLE 1 – MOTOR PROTECTOR DIP SWITCH SETTING (CONT’D)

YCAS STYLE G, ACROSS-THE-LINE – 60 HZ

MODEL
NO.

180

200

210
SYS. 1

210
SYS. 2

230

CHILLER
VOLT
NAMEPLATE
CODE
RLA
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58

321
279
169
140
112
342
298
181
149
119
374
325
197
163
130
342
298
181
149
119
374
325
197
163
130

NO.
LEADS
MP
PER
DISPLAY
PHASE
HA XXX
*4
*4
*2
2
1
*4
*4
*2
2
1
*4
*4
*2
*2
2
*4
*4
*2
2
1
*4
*4
*2
*2
2

108
94
114
189
151
115
101
122
201
161
126
110
133
110
175
115
101
122
201
161
126
110
133
110
175

MOTOR PROTECTOR
DIP SWITCH SETTINGS ON MP (“1” INDICATES ON)
128
0
0
0
1
1
0
0
0
1
1
0
0
1
0
1
0
0
0
1
1
0
0
1
0
1

64
1
1
1
0
0
1
1
1
1
0
1
1
0
1
0
1
1
1
1
0
1
1
0
1
0

32
1
0
1
1
0
1
1
1
0
1
1
1
0
1
1
1
1
1
0
1
1
1
0
1
1

16
0
1
1
1
1
1
0
1
0
0
1
0
0
0
0
1
0
1
0
0
1
0
0
0
0

8
1
1
0
1
0
0
0
1
1
0
1
1
0
1
1
0
0
1
1
0
1
1
0
1
1

4
1
1
0
1
1
1
1
1
0
0
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1

2
0
1
1
0
1
0
0
1
0
0
1
1
0
1
1
0
0
1
0
0
1
1
0
1
1

1
0
0
0
1
1
0
1
0
1
1
0
0
1
0
1
0
1
0
1
1
0
0
1
0
1

* Indicates one lead/phase through motor protector

YORK INTERNATIONAL

Product Description

FORM 201.19-NM1 (204)

TABLE 1 – MOTOR PROTECTOR DIP SWITCH SETTING (CONT’D)

YCAS STYLE G, WYE DELTA START – 60 HZ
MODEL
NO.

130

140

0150
SYS. 1

0150
SYS. 2

0160

0170
SYS. 1

0170
SYS. 2

CHILLER
VOLT
NAMEPLATE
CODE
RLA
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58

246
214
130
107
86
267
232
140
116
93
295
256
155
128
103
265
230
139
115
92
295
256
155
128
103
321
279
169
140
112
295
256
155
128
103

NO.
LEADS
MP
PER
DISPLAY
PHASE
HA XXX
*4
*2
2
2
2
*4
*4
2
2
2
*4
*4
2
2
2
*4
*4
2
2
2
*4
*4
2
2
2
*4
*4
*2
2
2
*4
*4
2
2
2

96
167
175
144
116
105
91
189
157
126
115
100
209
173
139
104
90
188
155
124
115
100
209
173
139
126
109
132
189
151
115
100
209
173
139

MOTOR PROTECTOR
DIP SWITCH SETTINGS ON MP (“1” INDICATES ON)
128
0
1
1
1
0
0
0
1
1
0
0
0
1
1
1
0
1
1
1
0
0
0
1
1
1
0
0
1
1
1
0
0
1
1
1

64
1
0
0
0
1
1
1
0
0
1
1
1
1
0
0
1
1
0
0
1
1
1
1
0
0
1
1
0
0
0
1
1
1
0
0

32
1
1
1
0
1
1
0
1
0
1
1
1
0
1
0
1
0
1
0
1
1
1
0
1
0
1
1
0
1
0
1
1
0
1
0

16
0
0
0
1
1
0
1
1
1
1
1
0
1
0
0
0
1
1
1
1
1
0
1
0
0
1
0
0
1
1
1
0
1
0
0

8
0
0
1
0
0
1
1
1
1
1
0
0
0
1
1
1
1
1
1
1
0
0
0
1
1
1
1
0
1
0
0
0
0
1
1

4
0
1
1
0
1
0
0
1
1
1
0
1
0
1
0
0
0
1
0
1
0
1
0
1
0
1
1
1
1
1
0
1
0
1
0

2
0
1
1
0
0
0
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
0
0
1
1
0
0
0
1
1
0
0
0
1

1
0
1
1
0
0
1
1
1
1
0
1
0
1
1
1
0
0
0
1
0
1
0
1
1
1
0
1
0
1
1
1
0
1
1
1

* Indicates one lead/phase through motor protector.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TABLE 1 – MOTOR PROTECTOR DIP SWITCH SETTING (CONT’D)

YCAS STYLE G, WYE DELTA START – 60 HZ
MODEL
NO.

180

200

210
SYS. 1

210
SYS. 2

230

CHILLER
VOLT
NAMEPLATE
CODE
RLA
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58
17
28
40
46
58

321
279
169
140
112
342
298
181
149
119
374
325
197
163
130
342
298
181
149
119
374
325
197
163
130

NO.
LEADS
MP
PER
DISPLAY
PHASE
HA XXX
*4
*4
*2
2
2
*4
*4
*2
2
2
*4
*4
*2
*2
2
*4
*4
*2
2
2
*4
*4
*2
*2
2

126
109
132
189
151
134
117
142
201
161
146
127
154
128
175
134
117
142
201
161
146
127
154
128
175

MOTOR PROTECTOR
DIP SWITCH SETTINGS ON MP (“1” INDICATES ON)
128
1
0
1
1
1
1
0
1
1
1
1
0
1
1
1
1
0
1
1
1
1
0
1
1
1

64
0
1
0
0
0
0
1
0
1
0
0
1
0
0
0
0
1
0
1
0
0
1
0
0
0

32
0
1
0
1
0
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1

16
0
0
0
1
1
0
1
0
0
0
1
1
1
0
0
0
1
0
0
0
1
1
1
0
0

8
0
1
0
1
0
0
0
1
1
0
0
1
1
0
1
0
0
1
1
0
0
1
1
0
1

4
0
1
1
1
1
1
1
1
0
0
0
1
0
0
1
1
1
1
0
0
0
1
0
0
1

2
1
0
0
0
1
1
0
1
0
0
1
1
1
0
1
1
0
1
0
0
1
1
1
0
1

1
0
1
0
1
1
0
1
0
1
1
0
1
0
0
1
0
1
0
1
1
0
1
0
0
1

* Indicates one lead/phase through motor protector.

YORK INTERNATIONAL

Product Description
MOTOR STARTING

Two types of compressor motor starting are available:
Across-the-Line and optional Wye-Delta Open Transition Starter.
Across-the-Line starters will utilize one contactor and
one start relay per compressor. The optional Wye-Delta
starter utilizes 4 motor contactors, a transition delay
relay, a start relay, and a start-wye relay.
The Wye-Delta start allows inrush current to be limited
to approximately 33% LRA for the first 4 to 7 seconds,
with current increasing to normal running current when
the Delta connection is completed.
When the micro initiates a start signal at Relay Output
Board #1 (SYS 1) Terminal 20 or Relay Output Board
#2 (SYS 2) Terminal 20 to run a compressor, the 1CR
(SYS 1) or 2CR (SYS 2) relay is energized. The transition of the 1CR (SYS 1) or 2CR (SYS 2) relay contacts
energizes the 1S (SYS 1) or 2S (SYS 2) relay approx.
16ms later. The 1S/2S contacts in turn energize the 1M
(SYS 1) or 3M (SYS 2) motor contacts 16ms later. This
completes the “WYE” connection of the motor start.
At the same time, the normally closed 1S/2S auxiliary
interlock contact opens preventing the 2M and 1 TRX
(SYS 1) or 4M and 2 TRX (SYS 2) motor contactors
from energizing. 2 sets of auxiliary contacts from 1M
(SYS 1) or 3M (SYS 2) close, interlocking the 1M (SYS
1) or 3M (SYS 2) contactors, keeping them energized
in parallel with 1S (SYS 1) or 2S (SYS 2).
The “WYE” connection of the motor start is enabled
for 4 to 7 seconds depending upon motor current as
sensed by the microprocessor. The transition to Delta
takes 7 seconds if current is below 110% FLA. If motor current exceeds 110% FLA, the transition is made
to Delta as long as the WYE has been enabled for at
least 4 seconds.
After the “WYE” connection is enabled for 4 to 7
seconds, the 1TR (SYS 1) or 2TR (SYS 2) transition
delay relay is enabled by the microprocessor from Relay
Output Board #1 Terminal 8 (SYS 1) or Relay Output
Board #2 Terminal 6 (SYS 2). The 1TR (SYS 1) or 2TR
(SYS 2) contacts open, de-energizing 1S (SYS 1) or 2S
(SYS 2). 1M (SYS 1) or 3M (SYS 2) remain energizes
through 2 sets of interlocking contacts 1M (SYS 1) or
3M (SYS 2). Opening of the 1TR (SYS 1) or 2TR (SYS
2) contacts deenergizes 1S/2S and closes the normally
closed 1S (SYS 1) or 2S (SYS 2) contacts, energizing

FORM 201.19-NM1 (204)

1 TRX (SYS 1) or 2 TRX (SYS 2). 1TRX or 2TRX
subsequently energizes motor contactor 2M (SYS 1) or
4M (SYS 2), completing the “DELTA” connection of
the motor.

1 TR, 1 TRX, 2 TR, and 2 TRX are
NOT “timing” relays. These devices
are sim ply pilot relays iden ti cal to
1CR and 2CR.

KEYPAD CONTROLS

Display
Parameters are displayed in English (°F and PSIG) or
Metric (°C and Bars) units, and for each circuit, the
following items can be displayed:
• Return and leaving chilled liquid, and ambient temperature.
• Day, date and time. Daily start/stop times. Holiday
and Manual Override status.
• Compressor operating hours and starts. Automatic or
manual lead/lag. Lead compressor identification.
• Run permissive status. No cooling load condition.
Compressor run status.
• Anti-recycle timer and anti-coincident start timer
status per compressor.
• System suction (and suction superheat), discharge,
and oil pressures and temperatures.
• Percent full load compressor motor current per phase
and average per phase. Compressor capacity control
valve input steps.
• Cutout status and setpoints for: supply fluid temperature, low suction pressure, high discharge pressure and temperature, high oil temperature, low and
high ambient, phase rotation safety, and low leaving
liquid temperature.
• Unloading limit setpoints for high discharge pressure and compressor motor current.
• Status of: evaporator heater, condenser fans, load
and unload timers, chilled water pump.
• “Out of range” message.
• Up to 6 fault shut down conditions.
The standard display language is English, with 4 other
languages available.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Entry – Used to confirm Set Point changes, cancel
inputs, advance day, and change AM/PM.
Setpoints – For setting chilled liquid temperature,
chilled liquid range, remote reset temperature range.
Clock – Used to set time, daily or holiday start/stop
schedule and manual override for servicing.
Print – Used to display or print operating data or system fault shutdown history for last six faults. Printouts
through an RS-232 port via a separate printer.
Program
For setting low leaving liquid temperature cutout, 300
to 600 second anti-recycle timer, average motor current
unload point, liquid temperature setpoint reset signal
from YORK ISN or building automation system.
Additional functions (password protected) for programming by a qualified service technician:
Cutouts for low and high ambient, low suction pressure and high discharge pressure, refrigerant type, high
discharge pressure unload setpoint.
ACCESSORIES AND OPTIONS

Multiple Point Power Connection (Standard)
Standard field power wiring connection on all models
is Multiple Point Power Connection. Field provided
power supply circuits, with appropriate branch circuit
protection, are connected to factory provided terminal
blocks, non-fused disconnect switches or circuit breakers
with lockable external handles located in the two power
compartments.
Single-Point Power Connection with Individual
Circuit Protection
A single-point supply circuit with field provided protection is connected to a factory provided terminal block
or non-fused disconnect switch located in the options
compartment. Factory wiring is provided from the terminal block or disconnect switch to factory supplied
internal branch circuit breakers with lockable external
handles in the power compartments.

YORK INTERNATIONAL

Single-Point Power Connection with Combined
Circuit Protection
A single-point supply circuit with field provided
protection is connected to a factory provided circuit
breaker with lockable external handle located in the
options compartment. Factory wiring is provided from
the circuit breaker to factory supplied terminal blocks
in the power compartments.
Single-Point Power Connection without Circuit
Protection
A single-point supply circuit with field provided protection is connected to a factory provided terminal block
or non-fused disconnect switch located in the options
compartment. Factory wiring is provided from the terminal block or disconnect switch to factory supplied
terminal blocks in the power compartments.
Control Circuit Terminal Block
A 120V, 20A control circuit power terminal strip located
in the control panel to accept a field provided control
power supply, rather than the standard factory mounted
control circuit transformer. The supply with appropriate
branch circuit protection in accordance with applicable
Local codes, provides the unit control circuit power supply via the panel mounted Emergency Stop Switch.
Building Automation System (BAS) Interface
Provides a means to reset the leaving chilled liquid temperature or percent full load amps (current limiting) from
the BAS (Factory-mounted):
Printed circuit board to accept 4 to 20mA, 0 to 10VDC,
or dry contact closure input from the BAS.
A YORK ISN Building Automation System can provide a Pulse Width Modulated (PWM) signal direct to
the standard control panel via the standard on-board
RS485 port.
Condenser Coil Protection
The standard condenser coils have Aluminum fins, copper tubes, and galvanized steel supports for generally
adequate corrosion resistance. However, these materials
are not adequate for all environments.

Product Description
The following options provide added protection:
Black fin condenser coils – Condenser coils constructed
using black epoxy coated Aluminum fin stock for corrosion resistance comparable to copper fin coils in
typical seashore locations.
Copper fin condenser coils – Coils constructed with
corrosion resistant copper fins. Not recommended in
areas where units may be exposed to acid rain.
Phenolic coated condenser coils – Completed condenser coil assemblies are covered with a cured Phenolic
coating. Probably the most suitable selection for seashore locations where salt spray may come into contact
with the fins, and other corrosive applications except:
strong alkalis, oxidizers, and wet bromine, chlorine, and
fluorine in concentrations greater than 100 PPM.
DX EVAPORATOR AND STARTER OPTIONS

300 PSIG (21 bar) Waterside Design Working
Pressure – The DX evaporator waterside is designed
and constructed for 300 PSIG (21 bar) working pressure.
(Factory-mounted)
1-1/2" (38 mm) Insulation – Double thickness insulation provided for enhanced efficiency.
Flange Accessory – Consists of raised face flanges to
convert grooved water nozzles to flanged evaporator
connections. Includes companion flanges for fieldmounting. (See Page 33.)
Remote DX Evaporator – Includes the main condensing unit less the evaporator, refrigerant and liquid
line devices. The insulated evaporator and field accessory kits per refrigerant circuit are supplied separately.
The condensing unit is shipped with a nitrogen holding
charge and the evaporator is shipped with a nitrogen
holding charge.
Flow Switch Accessory – Johnson Controls model
F61MG-1C Vapor-proof SPDT, NEMA 4X switch, 150
PSIG (10 bar) DWP, -20°F to 250°F (-29°C to 121°C),
with 1" NPT (IPS) connection for upright mounting in
horizontal pipe. A flow switch must be field installed
with each unit. Optional 300 PSIG switch available.

FORM 201.19-NM1 (204)

UNIT ENCLOSURES OPTIONS

Wire enclosure – Heavy gauge welded wire mesh
guards mounted on the exterior of the unit (Factory- or
field-mounted).
Louvered panels and wired guards – Louvered panels mounted over the exterior condenser coil faces, and
heavy gauge welded wire mesh guards mounted around
the bottom of the unit (Factory- or field-mounted).
Louvered panels (condenser coils only) – Louvered
panels are mounted over the exterior condenser coil faces
on the sides of the unit to visually screen and protect the
coils (Factory- or field-mounted).
Louvered panels (full unit) enclosure – Louvered
panels over condenser coils and around the bottom of
the unit (Factory- or field-mounted).
FAN OPTIONS

High static fans: Fans and motors suitable for High
External Static conditions to 100 Pa.
SOUND REDUCTION OPTIONS

Low speed fans – Reduced RPM fan motors and alternative fan selection for low noise applications.
Compressor sound enclosures – Acoustically
treated metal compressor enclosures.
VIBRATION ISOLATION

Neoprene pad isolation – Recommended for normal
installations. (Field-mounted)
1" (25 mm) spring isolators – Level adjustable, spring
and cage type isolators for mounting under the unit base
rails (Field-mounted).
2" (51 mm) seismic spring isolators – Restrained
Spring-Flex Mountings incorporate welded steel housing with vertical and horizontal limit stops. Housings designed to withstand a minimum 1.0 g accelerated force in
all directions to 2" (51 mm). Level adjustable, deflection
may vary slightly by application. (Field- mounted).

Star-Delta Compressor Motor Starter – Provides approximately 65% reduced inrush current compared to
across-the-line start (Factory-mounted).
24

YORK INTERNATIONAL

YORK INTERNATIONAL
#

# Tons
0130 0373
0140 0403
0150 0453
0160 0503
0170 0543
0180 0573
0200 0623
0210 0653
0230

X
D
B
D
X
X
B
B
S
S
Q

C
Q
T

X
Q

: No Option Required
: Special Quote

: Control Transformer Required

: Control Circuit Power Terminal Strip (std)
: Special Transformer Required

: Standard Power Option
X
: MP NF Disconnects
Q
: MP Circuit Breakers
: SP NF Disconnects
: SP TB
: SP Circuit Breaker
: SP TB w/ Separate System Circuit Breakers
: SP NF Disconnect w/ Separate System Circuit Breakers
: SP Supply w/ Separate Disconnect Switch
: SP w/ Separate Disconnect Switch
: Special Power Option

MP = Multiple Point
SP = Single-Point
NF = Non-Fused
TB = Terminal Block
Ser. = Service
TS = Thermal Storage
Ind. Sys. Brkr. & L. Ext. Handles = Individual
System Breaker & Lockable External Handle

X
M
M
S
S
B
S
D
C
C
Q
X
T
C
B
Q
X
S
F
G
I
Q
X
Q
L
C
N
Q
X
Q
X
P
Q
X
O
Q

High-Efficiency
Standard
High Ambient

NUM
TS
QQ

English LCD & Keypad Display (std)
Spanish LCD & Keypad Display
French LCD & Keypad Display
German LCD & Keypad Display
Italian LCD & Keypad Display
Special LCD & Keypad Display

:
:
:
:

No Option Required
Special Quote
No Pump Control Required
Pump Control Required
Special Pump Control Required
No Remote Control Panel Required
Optiview Remote Control Panel Required
Special Remote Control Panel Required
No Sequence Kit Required
Sequence Kit Required
Special Sequence Kit Required

N. American Safety Code
European Safety Code
No Listing
Special Safety Code

8
X

7
8
0
6

: 200/3/60
G
: 230/3/60
: 380/3/60
: 460/3/60
: 380/3/50
Y : 575/3/60
: Wye (Star) Delta
: Across-the-Line

X
C
S
B
Q
X
Q
X
Q
X
Q
X
Q
X
Q

: Leaving Water Temp = Degrees
: Thermal Storage
: Special LWT Requirements
: No Chicago Code Kit Required
: Chicago Code Kit Required
: Service Isolation Valve
: Both Isolation Valve and Chicago Code
: Special Chicago Code Kit Required
: Standard Valves Required
: Special Optional Valves Required
: No Option Required
: Special Quote
: No Option Required
: Special Quote
: No Option Required
: Special Quote
: No Option Required
: Special Quote
X : No Option Required
Q : Special Quote

: Design Series G
A : Engineering
Change
or PIN Level

14 15

DESIGN/DEVELOPMENT LEVEL (STYLE)

COMPRESSOR / PIPING FIELD

:
:
:
:
:
:
: No Option Required
: Special Quote

1
2
4
4
0
5

11 12 13

VOLTAGE/STARTER

29 30 31 32 33 34 35 36 37

: R-407C
: R-22

No BAS Reset / Offset Required
Temp Reset / Offset
Current Reset / Offset
Both Temp and Current Reset / Offset
Special BAS Reset / Offset Required

B
C

REFRIGERANT

:
:
:
:
:

: No Option Required
: Special Quote

E
S
G

:
:
:
:
:
:
:
:
X :
S :
Q :

CONTROLS FIELD

20 21 22 23 24 25 26 27 28

: YORK
#
: Chiller
: Air-Cooled
S : Screw

UNIT DESIGNATOR

POWER FIELD

5 6 7 8

NOMINAL CAPACITY

16 17 18 19

OPTIONS MODEL NUMBER

BASE PRODUCT TYPE

1 2 3 4

YCAS0230EC46YGA

BASIC PART NUMBER

FORM 201.19-NM1 (204)

UNIT NOMENCLATURE
NAMEPLATE ENGINEERING DATA

26
X
A

X
T

X
S

X
R

L
X

X
P

X
R

X
S

X
3
Q

X
D
Q

X
S
D
Q

A
S
F
T
I
P
D
O
E
U
Q

X
R
Q

X : Standard Warranty
B : 1st Year Parts & Labor
C : 2nd Year Parts Only
D : 2nd Year Parts & Labor
E : 5 Year Compressor Parts Only
F : 5 Year Compressor Parts & Labor Only
G : 5 Year Units Parts Only
H : 5 Year Unit Parts & Labor

Q : Special Fan Motors

: Aluminum
: Pre-Coated
: Copper
: Post-Coated
: Special Coil
: No Option
: Special Quote
X : TEAO Fan Motors

X
C

X
1

X
X

X
D

X
W

X
1
2
3
4
5
6
7
8
Q
X
P
B
Q
D
X
Q
X
Q
X
L
H
Q

CABINET FIELD

X
S
Q
X
1
S
N
Q

48 49 50 51 52 53 54

X
A

X
R

X
X

X
B

X
X

X
B

X
X

: No Enclosure Panels Required
: Wire Panels (Factory)
: Wire Panels (Field)
: Wire / Louvered Panels (Factory)
: Wire / Louvered Panels (Field)
: Louvered (Cond. Only) Panels (Factory)
: Louvered (Cond. Only) Panels (Field)
: Louvered (Full Unit) Panels (Factory)
: Louvered (Full Unit) Panels (Field)
: Special Enclosure Panels
: No Sound Enclosure Required
: Acoustical Arrgt. & Silencerb Kit
: Compressor Blanket
: Special Sound Enclosure
: Dual Sound Attenuation
: No Option Required
: Special Quote
: No Option Required
: Special Quote
: Standard Sound Fans
: Low Sound Fans
: High Static Fans
: Special Sound Fans
: No Final Overspray Paint Required
: Final Overspray Paint
: Special Overspray Paint Required
: No Vibration Isolators
: 1" Vibration Isolators
: Seismic Vibration Isolators
: Neoprene Vibration Isolators
: Special Vibration Isolators

NOTES:
1. Q :DENOTES SPECIAL / S.Q.
2. # :DENOTES STANDARD
3. X :w/in OPTIONS FIELD, DENOTES NO OPTION SELECTED
4. Agency Files (i.e. U.L. / E.T.L.; CE; ARI; ETC.) will contain info. based on the first 14 characters only.

: ASME Pressure Vessel Codes
: Australian Pressure Vessel Codes
: French Pressure Vessel Codes
: German Pressure Vessel Codes
: Italian Pressure Vessel Codes
: Polish Pressure Vessel Codes
: Sweden SAQ Pressure Codes
: Austian TUV Pressure Vessel Codes
: European "CE" Pressure Vessel Directive
: Dutch Pressure Pressure Vessel Codes
: Special Pressure Vessel Codes
: Standard Evaporator
: Remote Evaporator
: Special Evaporator Requirements
X : No Option Required
Q : Special Quote

55
WARRANTY FIELD

X
W
V
Q

: 150PSIG DWP
X
: 300PSIG DWP
B
: Special DWP
C
: 3/4" Evaporator Insulation
P
: 1 1/2" Evaporator Insulation
Q
: Special Evaporator Insulation
X
: No Flanges Required
Q
: Weld Flanges Required
: Vitaulic Flanges Required
: Special Flanges Required
: No Flow Switch
: Flow Switch
: Differential Pressure Switch
: Special Flow Switch
: Multinational Pressure Vessel Codes

45 46 47

CONDENSER FIELD

38 39 40 41 42 43 44

EVAP. FIELD

X
L

X
X

X
S

X
D

X
1
2
5
X
A
B
C
Q
X
Q
X
Q
X
Q

: No Refrigerant Warranty
: 1 Year Refrigerant
: 2 Year Refrigerant
: 5 Year Refrigerant
: No option required
: Buy American Act
: Both Buy American Act
: Container Shipping Kit
: Special quote
: No option required
: Special quote
: No option required
: Special quote
: No option required
: Special quote
B : Basildon Plant
R : Monterrey Plant

56 57 58 59 60 61

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

EXAMPLES:

Product Description
FORM 201.19-NM1 (204)

PRODUCT IDENTIFICATION NUMBER (PIN)

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

HANDLING AND STORAGE
DELIVERY AND STORAGE

INSPECTION

To ensure consistent quality and maximum reliability, all
units are tested and inspected before leaving the factory.
Standard units are shipped completely assembled and
containing refrigerant under pressure. Units are shipped
without export crating unless this has been specified on
the Sales Order.

Remove any transit packing and inspect the unit to ensure that all components have been delivered and that
no damage has occurred during transit. If any damage
is evident, it should be noted on the carrier's freight bill
and a claim entered in accordance with the instructions
given on the advice note.

Units with remote evaporators will have the chiller and
remote evaporator charged with nitrogen.

Major damage must be reported immediately to your
local YORK representative.

If the unit is to be put into storage, prior to installation,
the following precautions should be observed:

MOVING THE CHILLER

• Unit must be “blocked” so that the base is not
permitted to sag or bow.
• Ensure that all openings, such as water connections,
are securely capped.
• Do not store where exposed to ambient air temperatures exceeding 110°F (43°C).
• The condensers should be covered to protect the fins
from potential damage and corrosion, particularly
where building work is in progress.
• The unit should be stored in a location where there
is minimal activity in order to limit the risk of accidental physical damage.
• To prevent inadvertent operation of the pressure
relief devices the unit must not be steam cleaned.
• It is recommended that the unit is periodically inspected during storage.

YORK INTERNATIONAL

Prior to moving the unit, ensure that the installation
site is suitable for installing the unit and is capable of
supporting the weight of the unit and all associated
services.
The units are designed to be lifted using cables. A
spreader bar or frame 88" (2250 mm) wide should be
used in order to prevent damage to the unit from the
lifting chains (See Figures 3 and 4).
Units are provided with lifting eyes extending from the
sides of the base frame which can be attached to directly
using shackles or safety hooks (See Figure 4).
The unit must only be lifted by the base frame at the
points provided. Never move the unit on rollers, or
lift the unit using a forklift truck.
Care should be taken to avoid damaging the condenser
cooling fins when moving the unit.
Lifting Weights
For details of weights and weight distribution refer to
the Technical Data Section.

Handling and Storage

FORM 201.19-NM1 (204)

UNIT RIGGING

88" (2250mm)

CORRECT!

✓

CORRECT!

✗

WRONG!

LD03514

FIG. 3 – UNIT RIGGING

WRONG!
CORRECT!

LD03515

FIG. 4 – LIFTING LUGS
28

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

INSTALLATION
LOCATION REQUIREMENTS

To achieve optimum performance and trouble-free
service, it is essential that the proposed installation
site meets with the location and space requirements
for the model being installed. For dimensions, weight
and space requirements, including service access, refer
to the Technical Data Section.
It is important to ensure that the minimum service access space is maintained for cleaning and maintenance
purposes.
OUTDOOR INSTALLATIONS

The units can be installed at ground level, or on a
suitable rooftop location. In both cases an adequate
supply of air is required. Avoid locations where the
sound output and air discharge from the unit may be
objectionable.
The location should be selected for minimum sun exposure and away from boiler flues and other sources of
airborne chemicals that could attack the condenser coils
and steel parts of the unit.
If located in an area which is accessible to unauthorized
persons, steps must be taken to prevent access to the
unit by means of a protective fence. This will help to
prevent the possibility of vandalism, accidental damage,
or possible harm caused by unauthorized removal of
protective guards or opening panels to expose rotating
or high voltage components.
For ground level locations, the unit must be installed
on a suitable flat and level concrete base that extends
to fully support the two side channels of the unit base
frame. A one-piece concrete slab, with footings extending below the frost line is recommended. To avoid
noise and vibration transmission the unit should not be
secured to the building foundation.
On rooftop locations, choose a place with adequate
structural strength to safely support the entire operating
weight of the unit and service personnel. The unit can
be mounted on a concrete slab, similar to ground floor
locations, or on steel channels of suitable strength. The
channels should be spaced at the same centres as the
vibration mounting holes in the unit base frame and
must be at least 4-3/4" (120 mm) wide at the contact
points. This will allow vibration isolators to be fitted
if required.
YORK INTERNATIONAL

Any ductwork or attenuators fitted to the unit must
not have a total static pressure resistance, at full unit
airflow, exceeding the capability of the fans installed
in the unit.
INDOOR INSTALLATIONS

The unit can be installed in an enclosed plant room
providing the floor is level and of suitable strength
to support the full operating weight of the unit. It is
essential that there is adequate clearance for airflow
to the unit. The discharge air from the top of the unit
must be ducted away to prevent recirculation of air
within the plant room. If common ducts are used for
fans, non-return dampers must be fitted to the outlet
from each fan.
The discharge ducting must be properly sized with a
total static pressure loss, together with any intake static
pressure loss, less than the available static pressure
capability for the type of fan fitted.
The discharge air duct usually rejects outside the building through a louver. The outlet must be positioned to
prevent the air being drawn directly back into the air
intake for the condenser coils, as such recirculation
will affect unit performance.
LOCATION CLEARANCES

Adequate clearances around the unit(s) are required for
the unrestricted airflow for the air-cooled condenser
coils and to prevent recirculation of warm discharge
air back onto the coils. If clearances given are not
maintained, airflow restriction or recirculation will
cause a loss of unit performance, an increase in power
consumption and may cause the unit to malfunction.
Consideration should also be given to the possibility of
down drafts, caused by adjacent buildings, which may
cause recirculation or uneven unit airflow.
For locations where significant cross winds are expected, such as exposed roof tops, an enclosure of
solid or louver type is recommended to prevent wind
turbulence interfering with the unit airflow.
When units are installed in an enclosure, the enclosure
height should not exceed the height of the unit on more
than one side. If the enclosure is of louvered construction the same requirement of static pressure loss applies
as for ducts and attenuators stated above.
29

Installation

FORM 201.19-NM1 (204)

Where accumulation of snow is likely, additional height
must be provided under the unit to ensure normal airflow
to the unit.

The clearance dimensions given are
necessary to maintain good airflow
and ensure correct unit operation. It
is also necessary to consider access
requirements for safe operation and
maintenance of the unit and power
and control panels. Local health and
safety regulations, or practical considerations for service replacement
of large com po nents, may require
larger clearances than those given
in the Technical Data Section of this
manual, (page 90).

COMPRESSOR FEET BOLT REMOVAL

After the chiller is placed in the final location, remove
the four bolts, 1 , attaching the compressor feet to the
frame rails. These bolts are only used for shipping
purposes. The bolts are screwed into the compressor
feet from the bottom side of the frame rail. Refer to
Figure 5.
After the four shipping bolts are removed from the
compressor feet, the compressor will be held in place
by the four corner brackets, 2.
This assembly reduces compressor noise by isolating
the compressor from the base rails.
DO NOT remove the four 3/8" bolts, 3, mounting the
corner brackets, 2, to the frame rails.

COMPRESSOR

2
3

BASE SUPPORT
RAIL
2

1
CHANNEL BASE
LD09131

FIG. 5 – COMPRESSOR MOUNTING
30

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

VIBRATION ISOLATORS

Optional sets of vibration isolators can be supplied loose
with each unit.
Using the Isolator tables, refer to the Technical Data
Section, identify each mount and its correct location
on the unit.
Installation
Place each mount in its correct position and lower the
unit carefully onto the mounts ensuring the mount engages in the mounting holes in the unit base frame.
On adjustable mounts, transfer the unit weight evenly to
the springs by turning the mount adjusting nuts (located
just below the top plate of the mount) counter-clockwise
to raise and clockwise to lower. This should be done
two turns at a time until the top plates of all mounts are
between 1/4" and 1/2" (6 and 12 mm) clear of top of
their housing and the unit base is level.

A more detailed installation instruction
is provided in the Installation Instructions for VMC Series AWR/AWMR and
CP Restrained Mountings Section of
this manual, (page 107).
SHIPPING BRACES

The chiller’s modular design does not require shipping
braces.
PIPEWORK CONNECTION

General Requirements
The following piping recommendations are intended
to ensure satisfactory operation of the unit(s). Failure
to follow these recommendations could cause damage
to the unit, or loss of performance, and may invalidate
the warranty.

YORK INTERNATIONAL

The maximum flow rate and pressure
drop for the evaporator must not be
exceeded at any time. Refer to the
Technical Data Section for details.
The liquid must enter the evaporator
at the inlet connection. The inlet connection for the evaporator is at the far
end of the unit when viewed from the
power and control panels.
Water inlet is always nearest the suction gas outlet on the DX evaporators.
(chiller barrel)

A flow switch must be installed in the customer
pipework at the outlet of the evaporator and wired
back to the control panel using shielded cable. There
should be a straight run of piping of at least 5 pipe diameters on either side. The flow switch should be wired
to Terminals 13 and 14 (see Figs. 13 and 14, pages 40
and 41). A flow switch is required prevent damage to
the evaporator caused by the unit operating without
adequate liquid flow.
The flow switch used must have gold plated contacts
for low voltage/current operation. Paddle type flow
switches suitable for 150 PSIG (10 bar) (optional 300
PSIG) working pressure and having a 1" N.P.T. connection can be obtained from YORK as an accessory
for the unit. Alternatively a differential pressure switch
sited across an orifice plate may be used, preferably of
the high/low limit type.
The chilled liquid pump(s) installed in the pipework
system(s) should discharge directly into the unit evaporator section of the system. The pump(s) may be controlled
external to the unit - but an override must be wired to the
control panel so that the unit can start the pump in the
event that the liquid temperature falls below the minimum
setting. For details refer to “Electrical Connection.”

Installation
Pipework and fittings must be separately supported to
prevent any loading on the evaporator. Flexible connections are recommended which will also minimize
transmission of vibrations to the building. Flexible
connections must be used if the unit is mounted on
anti-vibration mounts as some movement of the unit
can be expected in normal operation.
Pipework and fittings immediately next to the evaporator should be readily de-mountable to enable cleaning
before operation, and to facilitate visual inspection of
the exchanger nozzles.
The evaporator must be protected by a strainer, preferably of 30 mesh, fitted as close as possible to the
liquid inlet connection, and provided with a means
of local isolation.
The evaporator must not be exposed to flushing velocities or debris released during flushing. It is recommended
that a suitably sized by-pass and valve arrangement is
installed to allow flushing of the pipework system. The
by-pass can be used during maintenance to isolate the
heat exchanger without disrupting flow to other units.
Thermometer and pressure gauge connections should
be provided on the inlet and outlet connections of each
evaporator.
Drain and air vent connections should be provided at all
low and high points in the pipework to permit drainage
of the system and to vent any air in the pipes.

FORM 201.19-NM1 (204)

Any debris left in the water pipework
between the strainer and evaporator
could cause serious damage to the
tubes in the evaporator and must be
avoided. The installer/user must also
ensure that the quality of the water
in circulation is adequate, without
any dissolved gases which can cause
ox i da tion of steel parts within the
evaporator.
WATER TREATMENT

The unit performance given in the Design Guide is based
on a fouling factor of 0.00025 ft2hr°F/Btu (0.044m2/hr
°C/kW). Dirt, scale, grease and certain types of water
treatment will adversely affect the heat exchanger surfaces and therefore unit performance. Foreign matter
in the water system(s) can increase the heat exchanger
pressure drop, reducing the flow rate and causing potential damage to the heat exchanger tubes.
Aerated, brackish or salt water is not recommended for
use in the water system(s). YORK recommends that a
water treatment specialist is consulted to determine the
proposed water composition will not affect the evaporator materials of carbon steel and copper. The pH value
of the water flowing through the evaporator must be kept
between 7 and 8.5.

Liquid systems at risk of freezing, due to low ambient
temperatures, should be protected using insulation and
heater tape and/or a suitable glycol solution. The liquid
pump(s) must also be used to ensure liquid is circulated
when the ambient temperature approaches freezing
point. Insulation should also be installed around the
evaporator nozzles. Heater tape of 21 watts per meter
under the insulation is recommended, supplied independently and controlled by an ambient temperature
thermostat set to switch on at 37°F (21°C) above the
freezing temperature of the liquid.
The liquid circulation pump must be controlled by the
unit. This will ensure that when the liquid temperature
falls within 3° or 5°F (2° or 3°C) of freezing, the pump
will start.
The evaporator is protected by heater mats under the insulation which are supplied from the unit control system
power supply. During risk of freezing the control system
should be powered to provide the freeze protection function unless the liquid systems have been drained.

Water
Out

Water
In
LD04739

Isolating Valve - Normally Open
Isolating Valve - Normally Closed
Flow Regulating Valve
Flow Measurement Device
Strainer
Pressure Tapping
Flow Switch
Flanged Connection
Pipework

FIG. 6 – PIPEWORK ARRANGEMENT

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

PIPEWORK ARRANGEMENT

Figure #6 shows the suggested pipework arrangement
for single unit installations. For multiple unit installations, each unit should be piped as shown.
CONNECTION TYPES & SIZES

For connection sizes relevant to individual models refer
to the Technical Data Section.
EVAPORATOR CONNECTIONS

Standard chilled liquid connections on all evaporators
are of the Victaulic Groove type.

It is recommended that a piece of pipe is fitted to each
valve and directed so that if the valve is activated, the
release of high pressure gas and liquid cannot be a danger
or cause injury. For indoor installations pressure relief
valves should be piped to the exterior of the building.
The size of any pipework attached to a relief valve must
be of sufficient diameter so as not to cause resistance to
the operation of the valve. Unless otherwise specified
by local regulations, internal diameter depends on the
length of pipe required and is given by the following
formula:
D5 = 1.447 x L
Where:
D = minimum pipe internal diameter in cm
L = length of pipe in meters

LD03521

FIG. 7 – VICTAULIC GROOVE

Optional Flanges
One of two types of flanges may be fitted depending on
the customer or local Pressure Vessel Code requirements.
These are Victaulic-Adapter flanges, normally supplied
loose, or weld flanges which may be supplied loose or
ready fitted. Victaulic-Adapter and weld flange dimensions are to ISO 7005 - NP10.

LD03523

Weld Flange

Victaulic Adapter

FIG. 8 – FLANGE ATTACHMENTS
REFRIGERANT RELIEF VALVE PIPING

Evaporators and oil separators are each protected
against internal refrigerant overpressure by refrigerant
relief valves. For evaporators, a pressure relief valve is
mounted on each of the main refrigerant lines connecting
the evaporator to the compressors.

YORK INTERNATIONAL

If relief pipework is common to more than one valve its
cross sectional area must be at least the total required
by each valve. Valve types should not be mixed on a
common pipe. Precautions should be taken to ensure
that the outlet of relief valves/vent pipe remain clear of
obstructions at all times.
DUCTWORK CONNECTION

General Requirements
The following ductwork recommendations are intended
to ensure satisfactory operation of the unit. Failure to
follow these recommendations could cause damage to
the unit, or loss of performance, and may invalidate the
warranty.
When ducting is to be fitted to the fan discharge it is
recommended that the duct should be the same cross sectional area as the fan outlet and straight for at least three
feet (1 meter) to obtain static regain from the fan.
Ductwork should be suspended with flexible hangers
to prevent noise and vibration being transmitted to the
structure. A flexible joint is also recommended between
the duct attached to the fan and the next section for the
same reason. Flexible connectors should not be allowed
to concertina.
The unit is not designed to take structural loading. No
significant amount of weight should be allowed to rest
on the fan outlet flange, deck assemblies or condenser
coil module. No more than 3 feet (1 meter) of light
construction ductwork should be supported by the unit.
Where cross winds may occur, any ductwork must be
supported to prevent side loading on the unit.

Installation
If the ducts from two or more fans are to be combined
into a common duct, back-flow dampers should be fitted in the individual fan ducts. This will prevent recirculation of air when only one of the fans is running.
Units are supplied with outlet guards for safety and to
prevent damage to the fan blades. If these guards are removed to fit ductwork, adequate alternative precautions
must be taken to ensure persons cannot be harmed or
put at risk from rotating fan blades.
ELECTRICAL CONNECTION

The following connection recommendations are intended to ensure safe and satisfactory operation of the
unit. Failure to follow these recommendations could
cause harm to persons, or damage to the unit, and may
invalidate the warranty.

No additional controls (relays, etc.)
should be mount ed in the control
panel. Power and control wiring not
connected to the control panel should
not be run through the control panel.
If these precautions are not followed it
could lead to a risk of electrocution. In
addition, electrical noise could cause
malfunctions or damage the unit and
its controls.
After connection do not switch on
main power to the unit. Some internal
components are live when main power
is switched on and this must only be
done by Authorized persons.
POWER WIRING

All electrical wiring should be carried out in accordance
with local regulations. Route properly sized cables to
cable entries on both sides of the unit.
In accordance with U.L. Standard it is the responsibility
of the user to install overcurrent protection devices
between the supply conductors and the power supply
terminals on the unit.
To ensure that no eddy currents are set up in the power
panel, the cables forming each 3-phase power supply
must enter via the same cable entry.

FORM 201.19-NM1 (204)

All sources of supply to the unit must
be taken via a common point of isolation (not supplied by YORK).

STANDARD UNITS WITH MULTI POINT POWER
SUPPLY WIRING

Standard units require two 3-phase separately fused 3wire supplies plus a ground per refrigerant system. One
supply to be connected to each of the power panels.
Connect each of the main 3-phase supplies to the circuit breakers, non-fused disconnect switches or terminal
boards located in the power panels using lug sizes detailed in the Technical Data Section.
Connect the ground wires to the main protective ground
terminals in each power panel.
Units with Single-Point Power Supply Wiring
Units require only one 3-phase supply plus ground.
Connect the 3-phase supplies to the terminal block or
non-fused disconnect switch/circuit breaker located in
the options panel using lug sizes detailed in the Technical Data Section.
Connect a ground wire to the main protective ground
terminal.
115VAC CONTROL SUPPLY TRANSFORMER

A 3-wire high voltage to 115VAC supply transformer
is standard in the chiller. This transformer steps down
the high voltage supply to 115VAC to be used by the
Micro Panel, Power Panel components, solenoids, heaters, etc.
The high voltage for the transformer primary is taken
from the chiller input to one of the systems. Fusing is
provided for the transformer.

It is important to check that the correct primary tapping has been used
and that it conforms to the site high
voltage supply.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Removing high voltage power to the
chiller will remove the 115VAC supply voltage to the microprocessor circuitry and the evaporator heater. In
cold weather, this could cause serious
damage to the chiller due to evaporator
freeze-up. Do not remove power unless
alternate means are taken to assure
operation of the evaporator heater.
Remote Emergency Stop Device
If required, a remote emergency stop device can be wired
into the unit. The device should be wired into terminals
31 and 32 (Figs. 13 and 14, pages 40 and 41.) in the
microprocessor control panel.
CONTROL PANEL WIRING

All wiring to the control panel terminal block terminals
13-19 is nominal 30VDC and must be run in shielded
cable, with the shield grounded at the panel end only.
Run shielded cable separately from mains cables to
avoid electrical noise pick-up. Use the control panel
cable entry to avoid the power cables.
The voltage free contacts supplied must be suitable for
30VDC (gold contacts recommended). If the voltage
free contacts are from a relay or contactor, the coil of
the device must be suppressed using a standard R/C
suppressor. The above precautions must be taken to
avoid electrical noise which could cause a malfunction
or damage to the unit and its controls.
The length of cable to these terminals must not exceed
25 ft. (7.5 m) unless an isolator is fitted.
VOLTS FREE CONTACTS

Chilled Liquid Pump Starter
Terminals 25 and 26 (Figs. 13 and 14, pages 40 and 41)
close to start the chilled liquid pump. This contact can be
used as a master start/stop for the pump in conjunction
with the daily start/stop schedule. See Section 8.1.15.

Run Contact
Terminals 29 and 30 (Figs. 13 and 14, pages 40 and 41)
close to indicate that a system is running.
Alarm Contacts
Each system has a voltage-free change over contact
which will operate to signal an alarm condition whenever a system locks out, or there is a power failure. To
obtain system alarm signal, connect the alarm circuit
to volt free terminals 23 and 24 (Figs. 13 and 14, pages
40 and 41) for No. 1 System and to terminals 27 and 28
(Figs. 13 and 14) for No. 2 System.
SYSTEM INPUTS

Flow Switch
A chilled water flow switch, (either by YORK or others)
MUST be installed in the leaving water piping of the
evaporator. There should be a straight horizontal run of
at least 5 diameters on each side of the switch. Adjust
the flow switch paddle to the minimum flow allowed
through the evaporator. (See manufacturer's instructions
furnished with the switch.) The switch is to be wired to
terminals 13 - 14 of CTB1 located in the control panel,
as shown on the unit wiring diagram.
Remote Run / Stop
Connect remote switch(es) in series with the flow switch
to provide remote run/stop control if required.
Remote Print
Closure of suitable contacts connected to terminals 13
and 18 (Figs. 13 and 14, pages 40 and 41) will cause a
hard copy printout of Operating Data/Fault History to
be made if an optional printer is connected to the RS
232 port.
Remote Setpoint Offset – Temperature
Timed closure of suitable contacts connected to
terminals 13 and 17 (PWM contacts) will provide
remote offset function of the chilled liquid set point
if required. See Figs. 13 and 14, pages 40 and 41 for
contact location.
Remote Setpoint Offset – Current
Timed contact closure of a suitable contact connected to
terminals 13 and 16 (PWM contacts) will provide remote
offset of EMS% CURRENT LOAD LIMIT. See Figs.
13 and 14, pages 40 and 41 for contact location.

YORK INTERNATIONAL

Installation

FORM 201.19-NM1 (204)

POWER PANEL LAYOUTS (TYPICAL)

028972-G

OPTIONAL DISCONNECT SWITCH

(WYE-DELTA - TYPICAL)

028973-G

OPTIONAL CIRCUIT BREAKER SWITCH

(ACROSS THE LINE - TYPICAL)

FIG. 9 – POWER PANEL SECTION
36

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

OPTION PANEL LAYOUT (TYPICAL)

LOGIC PANEL

OPTION PANEL
WITH SINGLE
POINT TERMINAL
BLOCK
(OPTIONAL)

00246VIP

FIG. 10 – OPTION PANEL SECTION
YORK INTERNATIONAL

Installation

FORM 201.19-NM1 (204)

LOGIC SECTION LAYOUT

60 Hz Models:
5

028975-G

PHOTOGRAPH OF
60 HZ MODEL LOGIC SECTION
ITEM
1
2
3
4
5
6
7
8

DESCRIPTION
Microprocessor Board
Back of Display
I/O Expansion Board #1
Power Supply Board
Relay Output Board #1
Relay Output Board #2
Flow Switch & Customer Connection Terminals
Circuit Breakers CB1, CB2, CB3

FIG. 11 – LOGIC SECTION LAYOUT
38

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

LOGIC SECTION LAYOUT WITH CONTROL PANEL

4
028976-G

FIG. 12 – LOGIC SECTION LAYOUT WITH CONTROL PANEL
YORK INTERNATIONAL

Installation

FORM 201.19-NM1 (204)

CUSTOMER CONNECTIONS

TERMINALS 13-34

028977-G

Flow Switch
13

System No. 1 Run
14
15

Current
PWM
13

Temperature
PWM
13

System No. 2 Run

System No. 1
Alarm Contacts

Chilled Liquid
Circulating Pump
Start

Print
13

System No. 2
Alarm Contacts

25
26
27
28
29

Chiller Run
30

Isolator
Auxiliary
Interlock

CONNECTION
POINTS FOR
EMERGENCY
STOPS
LD03502

FIG. 13 – CUSTOMER CONNECTIONS
40

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

CUSTOMER CONNECTIONS

RELAY BOARDS

I/O EXPANSION BOARD

TRANSFORMERS

4
SYSTEM
SWITCHES

CIRCUIT
BREAKERS
CB1, CB2, CB3
115 VAC SUPPLY
MICROPROCESSOR
CIRCUIT BOARD

CUSTOMER
CONNECTIONS
(FLOW SWITCH, ALARM, RUN, ETC.)

2028978-G

FIG. 14 – CUSTOMER CONNECTIONS
YORK INTERNATIONAL

Commissioning

FORM 201.19-NM1 (204)

COMMISSIONING
PREPARATION

Commissioning of this unit should
only be carried out by YORK Authorized personnel.

The Millennium Microcomputer Control System
Operating Instructions must be read in conjunction
with this section.
PREPARATION – POWER OFF

The following checks should be made with the customer
supply/supplies to the unit switched OFF.
Inspection
Inspect unit for installation damage. If damage is found
take action and/or repair as appropriate.
Refrigerant Charge
Units are normally shipped as standard with a full
refrigerant operating charge. Check that refrigerant
pressure is present in both systems and that no leaks
are apparent. If no pressure is present a leak test must be
undertaken. The leak(s) should be located and repaired.
Repaired systems and units supplied with a nitrogen
holding charge must be evacuated with a suitable vacuum pump/recovery unit as appropriate to below 100
microns.
Do not liquid charge with static water in the evaporator.
Care must also be taken to liquid charge slowly to avoid
excessive thermal stress at the charging point. Once the
vacuum is broken, charge into the condenser coils with
the full operating charge as given in the Technical Data
Section.
Valves
Open each compressor suction, economizer, and discharge valve fully (counter-clockwise) then close one
turn of the stem to ensure operating pressure is fed to
the pressure transducers. Open the liquid line service
valve fully and ensure the oil return line ball valve is
open in each system.
Compressor Oil
To add oil to a circuit - connect a YORK hand oil pump
(Part No. 470-10654-000) to the 1/4" oil charging valve
on the oil separator piping with a length of clean hose
42

or copper line, but do not tighten the flare nut. Using
clean oil of the correct type (“L” oil), pump oil until all
air has been purged from the hose then tighten the nut.
Stroke the oil pump to add oil to the oil system. The oil
level should be between the middle of the lower and
middle of the upper sight glasses of the oil separator.
Approximately 5 gallons is present in the entire chiller
system, with 1-2 gallons in the oil separator.
Fans
Check that all fans are free to rotate and are not damaged. Ensure blades are at the same height when rotated.
Ensure fan guard is securely fixed.
Isolation/Protection
Verify that all sources of electrical supply to the unit
are taken from a single point of isolation. Check that
the maximum recommended fuse sizes given in the
Technical Data Section have not been exceeded.
Control Panel
Check the panel to see that it is free of foreign materials
(wire, metal chips, etc.) and clean out if required.
Power Connections
Check to assure the customer power cables are connected
correctly. Ensure that connections of power cables within
the panels to the circuit breakers, terminal blocks or
switch disconnectors are tight.
Grounding
Verify that the unit’s protective terminal(s) are properly
connected to a suitable grounding point. Ensure that all
unit internal ground connections are tight.
Overloads
Ensure that the fan overloads settings are correct for the
type of fan fitted.
Supply Voltage
Verify that the site voltage supply corresponds to the
unit requirement and is within the limits given in the
Technical Data Section.
Control Transformer
The 3-wire control transformer is mounted external to
the panel. It is important to check that the correct primary
tapping has been used:
With the supply voltage to the unit turned off, remove
the lid to the transformer box.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Check that the tapping used conforms to the site supply
voltage. After the tapping is verified, replace the lid.
Switch Settings
Ensure that the unit ON/OFF switch on the display door
and the micro board system switches S2 through S5 are
set to “0” (OFF). Set the red handled emergency stop
device on the options panel to “1” (ON). For units fitted
with door interlocked circuit breakers the power panel
doors must be closed and the devices set to “1” (ON).
The customer’s power disconnection devices can now
be set to ON.

The machine is now live!

The unit is fitted with an under voltage circuit in each
panel and it may take between 5 to 10 seconds for its
contacts to close and energize the unit’s electronics,
including the display on the main panel.
Compressor Heaters
Verify the compressor heaters are en er gized. If
the ambient temperature is above 96°F (36°C) the
compressor heaters must be on for at least 8 hours before
start-up to ensure all refrigerant liquid is driven out of
the compressor. If the ambient temperature is below
86°F (30°C) then allow 24 hours.
Water System
Verify that the chilled liquid system has been installed
correctly, and has been commissioned with the correct
direction of water flow through the evaporator. The inlet
should be at the refrigerant pipework connection end of
the evaporator. Purge air from the top of the evaporator
using the plugged air vent mounted on the top of the
evaporator body. Flow rates and pressure drops must be
within the limits given in the Technical Data Section.
Operation outside of these limits is undesirable and could
cause damage.
Flow Switch
Verify a chilled water flow switch is correctly fitted in
the customer’s pipework on the evaporator outlet, and
wired into the control panel correctly using shielded

YORK INTERNATIONAL

cable. There should be a straight run of at least 5 pipe
diameters on either side of the flow switch. The flow
switch should be connected to terminals 13 and 14 in the
micro panel (Figs. 13 and 14, pages 40 and 41).
Temperature Sensor(s)
Ensure the leaving liquid temperature sensor is coated
with heat conductive compound (part no. 013-00890000) and is inserted in the water outlet sensor pocket
of the evaporator. This sensor also acts as the freeze
protection thermostat sensor and must always be in the
water OUTLET sensor pocket.
Control Supply
Verify the control panel display is illuminated.
Programmed Options
Verify that the options factory programmed into the
Microcomputer Control Center are in accordance with
the customer’s order requirements by pressing the ‘Options’ key on the keypad and reading the settings from
the display.
Programmed Settings
Ensure the system cut-out and operational settings
are in accordance with the instructions provided in
Section 8 (page 166) and with the general chiller operational requirements by pressing the ‘Program’ key.
The chilled liquid temperature control settings need to
be set according to the unit model and required operating conditions.
Date and Time
Program the date and time by first ensuring that the CLK
jumper J18 on the microprocessor board is in the ON
position (top two pins). Then press the ‘Clock Set Time’
key and set the date and time. (See Section 7.)
Start/Stop Schedule
Program the daily and holiday start/stop by pressing the
‘Set Schedule/Holiday’ key. (See Section 7.)
Setpoint and Remote Offset
Set the required leaving chilled liquid temperature
setpoint and control range. If remote temperature reset
(offset) is to be used, the maximum reset must be programmed by pressing the ‘Remote Reset Temp’ key.
(See Section 6.)

Commissioning

FIRST TIME START-UP

During the commissioning period
there should be sufficient heat load
to run the unit under stable full load
operation to enable the unit controls,
and system operation to be set up correctly and a commissioning log taken.
Be sure that the Micro Panel is properly programmed (page 166) and the
System Start-up Checklist (page 117)
is completed.
Interlocks
Verify that liquid is flowing through the evaporator and
that heat load is present. Ensure that any remote run interlocks are in the run position and that the run schedule
requires the unit to run or is overridden.
System Switches
Place the ‘Sys 1’ switch on the microprocessor board to
the ‘ON’ position – (Fig. 46, page 130).
Start-up
Remove the locking device from the unit Auto/OFF
switch which prevents unauthorized starting of the unit
before commissioning. Press the ‘Status’ key, then turn
the unit switch to the “1” position to start the unit (there
may be a few seconds delay before the first compressor
starts because of the anti-recycle timer). Be ready when
each compressor starts, to switch the unit OFF immediately if any unusual noises or other adverse conditions
develop. Use the appropriate emergency stop device if
necessary.
Oil Pressure
When a compressor starts, press the relevant ‘System
Pressures’ key and verify that oil differential pressure
develops immediately (Discharge Pressure minus Oil
Pressure). If oil pressure does not develop, the automatic
controls will shut down the compressor. Under no circumstances should a restart attempt be made on a compressor which does not develop oil pressure immediately.
Switch the unit switch to the ‘0’ position (OFF).
Refrigerant Flow
When a compressor starts, a flow of liquid refrigerant
will be seen in the liquid line sight glass. After several
minutes operation and providing a full charge of refrigerant is in the system, the bubbles will disappear and be
replaced by a solid column of liquid.
44

FORM 201.19-NM1 (204)

Fan Rotation
As discharge pressure rises, the condenser fans operate
in stages to control the pressure. Verify that the fan operation is correct for the type of unit.
Suction Superheat
Check suction superheat at steady full compressor load
only. Measure suction temperature on the copper line
about 6" (150 mm) before the compressor suction service valve. Measure suction pressure at the compressor
service valve. Superheat should be 10°F to 12°F
(5.6°C to 6.7°C).
Expansion Valve
The electronic expansion valves are factory set and
should not need adjustment.
Economizer Superheat
(Not all models are equipped with economizers)
Check economizer superheat at steady full compressor
load only, under conditions when the economizer solenoid is energized. (See Section 1.22, page 134) Measure
gas temperature on the economizer outlet pipe next to the
expansion valve bulb. Measure gas pressure at the back
seat port of the economizer service valve. Superheat as
measured should be 10°F to 12°F (5.6°C to 6.7°C).
Subcooling
Check liquid subcooling at steady full compressor
load only. It is important that all fans are running for
the system. Measure liquid line temperature on the
copper line beside the main liquid line service valve.
Measure liquid pressure at the liquid line service valve.
Subcooling should be 12°F to 15°F (6.7°C to 8.3°C).
No bubbles should show in the sight glass. If subcooling
is out of range add or remove refrigerant as required.
Do not overcharge the unit. The liquid flow to the main
evaporator TXV is subcooled further by the economizer,
increasing subcooling to between 22°F and 28°F (12°C
and 15°C) at ambients above 90ºF.
General Operation
After completion of the above checks for System 1, stop
the unit, switch OFF the ‘SYS 1’ switch on the main
panel microprocessor board and repeat the process for
each subsequent system. When all run correctly, stop the
unit, switch all applicable switches to the ‘ON’ position
and restart the unit.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

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YORK INTERNATIONAL

Operation

FORM 201.19-NM1 (204)

OPERATION
GENERAL DESCRIPTION

NORMAL RUNNING AND CYCLING

The units are designed to work independently, or in
conjunction with other equipment via a YORK ISN
building management system or other automated control system. When operating, the unit controls monitor
the chilled liquid system temperature at the unit and
take the appropriate action to maintain this temperature
within desired limits. This action will involve running
one or more compressors at a suitable load step to match
the cooling effect of the refrigerating systems to the
heat load on the liquid system. The heat removed from
the chilled liquid is then rejected from the air cooled
condenser coils.

Once the unit has been started, all operations are fully
automatic. After an initial period at minimum capacity
on the lead compressor, the control system will adjust
the unit load depending on the chilled liquid temperature
and rate of temperature change. If high heat load is present, the controller will increase the capacity of the lead
compressor and/or start-up the other compressor.

The following sections give an overview of the operation
of the unit. For detailed information, reference should
be made to the Chiller Control Panel Programming and
Data Access Operating Instructions for the unit (pages
122 - 192).

Once a compressor is running, discharge pressure rises
as refrigerant is pumped into the air cooled condenser
coils. This pressure is controlled by stages of fans to
ensure maximum unit efficiency while maintaining sufficient pressure for correct operation of the condensers
and expansion valves.

START-UP

Check the main power supplies to the unit are ‘ON’, all
refrigerant service valves are open (counter-clockwise
one turn short of fully open) and chilled liquid flow has
been established (unless the unit chilled liquid pump
start control is being used, in which case just ensure
the pump supply is on). Ensure only the correct system
switches (SYS 1-2) on the microprocessor circuit board
are in the ‘ON’ position.
Press the ‘STATUS’ key on the keypad and then switch
the unit ON/OFF switch below the keypad to the ON
position.
The controller will perform a pre-check to ensure that
the daily/holiday schedule and any remote interlocks will
allow the unit to run, all safety cut-outs are satisfied and
that cooling load is required (i.e. that the chilled liquid
temperature is outside the set limits). Any problems
found by the pre-check will be displayed if present. If
no problems are present and cooling duty is required the
lead compressor will start.
The display will show the anti-coincidence timer status
for the lag compressor, followed by ‘NO COOL LOAD’
until it is called to operate by the control system.

If very little heat load is present, the lead compressor
will continue at minimum capacity or may simply stop
again to avoid overcooling the liquid. If the latter is the
case, one compressor will restart automatically should
the liquid temperature rise again.

When a compressor is running, the controller monitors
oil pressure, motor current, and various other system
parameters such as discharge pressure, chilled liquid
temperature, etc. Should any problems occur, the control
system will immediately take appropriate action and
display the nature of the fault (Section 8).
SHUTDOWN

The unit can be stopped at any time by switching the
UNIT ON/OFF switch just below the keypad to the
OFF position. The compressor heater will energize to
prevent refrigerant condensing in the compressor rotors.
If ambient temperatures are low, the evaporator heater
mats will also energize to prevent the possibility of liquid freezing in the vessels. The mains power to the unit
should not normally be switched OFF, even when the
unit is not required to run.
The system switches (S2-S5) on the microboard can be
used to cycle a system OFF. An automatic pumpdown
will occur using the system switches.
If mains power must be switched OFF, (for extended
maintenance or a shutdown period), the compressor suction, discharge and motor cooling service stop valves
should be closed (clockwise) and if there is a possibility
of liquid freezing due to low ambient temperatures, the
evaporators should be drained. Valves should be opened
and power must be switched on for at least 8 Hours
(36 Hours if ambient temperature is over 86°F [30°C])
before the unit is restarted.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

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YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

TECHNICAL DATA
FLOW RATE AND PRESSURE DROP CHARTS
EVAPORATOR WATER PRESSURE DROP
(ENGLISH UNITS)
YCAS0130 - 0230

EVAPORATOR WATER PRESSURE DROP
(SI UNITS)
YCAS0130 - 0230

1000.00

100.00

Press Drop, kPA

Press Drop, Ft H2O

100.00

10.00

1.00

1.00
100

Flow, GPM

MODEL NUMBER YCAS
0130, 0140
0150, 0160, 0170, 0180,
0200, 0210,
0230

500

10.00

1000
LD09230A

EVAPORATOR
A
B
C
D

100.00

50.00

Flow, L/S
MODEL NUMBER YCAS
0130, 0140
0150, 0160, 0170, 0180,
0200, 0210,
0230

LD04482A

EVAPORATOR
A
B
C
D

Pressure Conversion : Ft H20 = 2.3 x PSI

FIG. 15 – FLOW RATE AND PRESSURE DROP CHARTS

GLYCOL CORRECTION FACTORS
The evaporator is designed in accordance with ARI-59092 which allows for an increase in pressure drop of up
to 15% above the design value given above. Debris in
the water may also cause additional pressure drop.

ETHYLENE GLYCOL

1.45
1.40
1.35
1.30

When using glycol solutions, pressure drops are higher
than with water (see correction factors to be applied
when using glycol solutions).

A = Correction Factor
B = Mean Temperature through Evaporator (°C)
C = Concentration W/W (%)

1.20

40%

1.15

30%

1.10

20%

1.05
-10

Excessive flow, above the max GPM,
will damage the evaporator.

50%

1.25

10%
-8

-6

-4

-2

°C

PROPYLENE GLYCOL

1.8
1.7
1.6
1.5

GLYCOL CORRECTION EXAMPLE: (With YCAS0140)
• RWT = 36°F LWT = 28°F
• Average Water Temperature = 32°F (= 0°C)
• For 30% Propylene Glycol: From Graph, Find Correction Factor =
1.3 @ 0°C and 30%

• Actual Measured ∆P = 12' H20
• Corrected ∆P = 12'/1.3 = 9.2' H20
• From Flow Rate and Pressure Drop Chart, locate flow @ 9.2' ≈

50%

1.4
1.3

40%

1.2

30%

1.1

20%
10%

1.0
-10

-8

-6

-4

-2

°C

LD03504

FIG. 16 – GLYCOL CORRECTION FACTORS

300 GPM

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TEMPERATURE AND FLOWS
(ENGLISH UNITS)

MODEL
NUMBER
YCAS
0130EC
0140EC
0150EC
0160EC
0170EC
0180EC
0200EC
0210EC
0230EC

LEAVING WATER
TEMPERATURE (°F)
MIN.1
40
40
40
40
40
40
40
40
40

MAX.2
55
55
55
55
55
55
55
55
55

EVAPORATOR FLOW
(GPM3)
MIN.
138
138
200
200
200
200
250
250
250

MAX.
525
525
600
600
600
600
750
750
750

AIR ON CONDENSER (°F)
MIN.
0
0
0
0
0
0
0
0
0

MAX
125
125
125
125
125
125
125
125
125

NOTES:
1. For leaving brine temperature below 40°F (4.4°C), contact your nearest YORK office for application requirements.
2. For leaving water temperature higher than 55°F (12.8°C), contact the nearest YORK office for application guidelines.
3. The evaporator is protected against freezing to -20°F (-28.8°C) with an electric heater as standard.

Excessive flow, above the max GPM,
will damage the evaporator.

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

TEMPERATURE AND FLOWS
(SI UNITS)

MODEL
NUMBER
YCAS
0130EC
0140EC
0150EC
0160EC
0170EC
0180EC
0200EC
0210EC
0230EC

LEAVING WATER
TEMPERATURE (°C)
MIN.1
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4
4.4

MAX.2
12.8
12.8
12.8
12.8
12.8
12.8
12.8
12.8
12.8

Evaporator FLOW
(l/s3)
MIN.
8.7
8.7
12.6
12.6
12.6
12.6
15.8
15.8
15.8

MAX.
33.1
33.1
37.9
37.9
37.9
37.9
47.3
47.3
47.3

AIR ON CONDENSER (°C)
MIN.
-17.7
-17.7
-17.7
-17.7
-17.7
-17.7
-17.7
-17.7
-17.7

MAX
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7

Excessive flow, above the max GPM,
will damage the evaporator.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

PHYSICAL DATA
ENGLISH UNITS
MODEL NUMBER YCAS
0130EC
General Unit Data
Unit Capacity at ARI Conditions, Tons
121.1
Number of Independent Refrigerant Circuits
2
Refrigerant Charge, R-22, Ckt.-1 / Ckt.-2, lbs.
180 / 180
Oil Charge, Ckt.-1 / Ckt.-2, gallons
5/5
Shipping Weight:
Aluminum Fin Coils, lbs.
9,888
Copper Fin Coils, lbs.
11,154
Operating Weight:
Aluminum Fin Coils, lbs.
10,315
Copper Fin Coils, lbs.
11,581
Compressors, DXS Semihermetic Twin Screw
Quantity per Chiller
2
Nominal Ton Size, Ckt.-1 / Ckt.-2
62 / 62
Refrigerant Economizer, Ckt.-1 / Ckt.-2
No / No
Condensers, High Efficiency Fin / Tube with Integral Subcooler
Total Chiller Coil Face Area, ft2
256
Number of Rows
3
Fins per Inch
13
CONDENSER FANS
Number, Ckt.-1 / Ckt.-2
4/4
Standard Fans
Fan Motor, HP / kW
2 / 1.8
Fan & Motor RPM
1140
Fan Diameter, inches
35.4
Fan Tip Speed, feet/min.
10,575
Total Chiller Airflow, CFM
114,400
Low Noise Fans
Fan Motor, HP / kW
2 / 1.53
Fan & Motor Speed, RPM
840
Fan Diameter, inches
35.4
Fan Tip Speed, feet/min.
7,792
Total Chiller Airflow, cfm
112,400
High Static Fans
Fan Motor, HP / kW
5 / 3.79
Fan & Motor RPM
1140
Fan Diameter, inches
35.4
Fan Tip Speed, feet/min.
10,575
Total Chiller Airflow, CFM (@0.4" additional static)
114,400
Evaporator, Direct Expansion
Water Volume, gallons
53
150
Maximum1 Water Side Pressure, PSIG
Maximum Refrigerant Side Pressure, PSIG
350
Minimum Chilled Water Flow Rate, GPM
138
Maximum Chilled Water Flow Rate, GPM
525
Water Connections, inches
8
1

0140EC

0150EC

0160EC

0170EC

0180EC

0200EC

0210EC

0230EC

130.1
2
180 / 180
5/5

145.3
2
180 / 190
5/5

157.1
2
190 / 190
5/5

164.3
2
190 / 190
5/5

171.6
2
190/190
5/5

186.7
2
220/220
5/5

194.8
2
220/220
5/5

209.1
2
220/220
5/5

10,110
11,376

10,599
11,865

10,583
11,849

10,694
11,960

10,805
12,071

11,849
13,441

11,970
13,552

12,081
13,663

10,537
11,803

11,263
12,529

11,247
12,513

11,358
12,624

11,469
12,735

12,513
14,105

12,634
14,216

12,745
14,327

2
68 / 68
Yes / Yes

2
78 / 68
No / Yes

2
78 / 78
No / No

2
85 / 78
Yes / No

2
85/85
Yes / Yes

2
95/95
No / No

2
105/95
Yes / No

2
105/105
Yes / Yes

256
3
13

320
3
13

4/4

5/5

2 / 1.8
1140
35.4
10,575
114,400

2 / 1.8
1140
35.4
10,575
143,000

2 / 1.53
840
35.4
7,792
112,400

2 / 1.8
1140
35.4
10,575
114,400

2 / 1.8
1140
35.4
10,575
143,000

5 / 3.79
1140
35.4
10,575
114,400

5 / 3.79
1,140
35.4
10,575
114,400

5 / 3.79
1,140
35.4
10,575
143,000

53
150
350
138
525
8

55
150
350
200
600
8

79
150
350
250
750
8

Optional 300 PSIG Waterside available

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

PHYSICAL DATA
SI UNITS
MODEL NUMBER YCAS
0130EC
General Unit Data
Unit Capacity at 6.7°C water & 35°C ambient, kW
425.7
Number of Independent Refrigerant Circuits
2
Refrigerant Charge, R-22, Ckt.-1 / Ckt.-2, kg.
82 / 82
Oil Charge, Ckt.-1 / Ckt.-2, liters
19 / 19
Shipping Weight:
Aluminum Fin Coils, kg.
4,484
Copper Fin Coils, kg.
5,059
Operating Weight:
Aluminum Fin Coils, kg.
4,679
Copper Fin Coils, kg.
5,253
Compressors, DXS Semihermetic Twin Screw
Quantity per Chiller
2
Nominal kW Size, Ckt.-1 / Ckt.-2
220 / 220
Refrigerant Economizer, Ckt.-1 / Ckt.-2
No / No
Condensers, High Efficiency Fin / Tube with Integral Subcooler
Total Chiller Coil Face Area, m2
23.78
Number of Rows
3
Fins per Meter
512
CONDENSER FANS
Number, Ckt.-1 / Ckt.-2
4/4
Standard Fans
Fan Motor, HP / kW
2 / 1.8
Fan & Motor Speed, rev./sec.
19.0
Fan Diameter, mm
900
Fan Tip Speed, m/sec.
40
Total Chiller Airflow, l/sec.
53,989
Low Noise Fans
Fan Motor, HP / kW
2 / 1.53
Fan & Motor Speed, rev./sec.
14
Fan Diameter, mm
900
Fan Tip Speed, m/sec.
40
Total Chiller Airflow, l/sec.
53,045
High Static Fans
Fan Motor, HP / kW
5 / 3.79
Fan Diameter, mm
900
Fan Tip Speed, m/sec.
54
Total Chiller Airflow, l/sec. (@0.4" additional static)
53,989
Fan & Motor Speed, rev./sec.
19.0
Evaporator, Direct Expansion
Water Volume, liters
200
10
Maximum1 Water Side Pressure, Bar
Maximum Refrigerant Side Pressure, Bar
24
Minimum Chilled Water Flow Rate, l/sec.
8.7
Maximum Chilled Water Flow Rate, l/sec.
33.1
Water Connections, inches
8

0140EC

0150EC

0160EC

0170EC

0180EC

0200EC

0210EC

0230EC

457.6
2
82 / 82
19 / 19

510.9
2
82 / 86
19 / 19

552.6
2
86 / 86
19 / 19

578.0
2
86 / 86
19 / 19

603.4
2
86 / 86
19 / 19

656.6
2
100 / 100
19 / 19

685.2
2
100 / 100
19 / 19

735.2
2
100 / 100
19 / 19

4,585
5,159

4,807
5,381

4,800
5,374

4,850
5,424

4,900
5,474

5,374
6,096

5,429
6,146

5,479
6,196

4,780
5,354

5,109
5,683

5,102
5,676

5,152
5,726

5,202
5,777

5,676
6,398

5,731
6,448

5,781
6,499

2
240 / 240
Yes / Yes

2
275 / 240
No / Yes

2
275 / 275
No / No

2
300 / 275
Yes / No

2
300/300
Yes / Yes

2
335/335
No / No

2
370/335
Yes / No

2
370/370
Yes / Yes

23.78
3
512

29.73
3
512

4/4

5/5

2 / 1.8
19.0
900
40
53,989

2 / 1.8
19.0
900
54
53,989

2 / 1.8
19.0
900
54
67,486

2 / 1.53
14
900
40
53,045

2 / 1.53
14
900
40
66,307

5 / 3.79
900
54
53,989
19.0

5 / 3.79
19.0
900
54
53,989

5 / 3.79
19.0
900
54
67,486

200
10
24
8.7
33.1
8

208
10
24
12.6
37.9
8

299
10
24
15.8
47.3
8

Optional 300 PSIG Waterside available

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

OPERATING LIMITATIONS AND SOUND POWER DATA
OPERATING LIMITATIONS – ENGLISH UNITS

OPERATING LIMITATIONS – SI UNITS

MIN

MAX

LEAVING CHILLED LIQUID TEMP ( °F)

40.1

LEAVING CHILLED LIQUID TEMP ( °C)

CHILLED WATER TEMP DIFFERENCE ( °F)

5.5

CHILLED WATER TEMP DIFFERENCE ( °C)

WATER SIDE PRESSURE (PSIG)

150

WATER SIDE PRESSURE (BAR)

–

REFRIGERANT SIDE PRESSURE (PSIG)

300

REFRIGERANT SIDE PRESSURE (BAR)

–

EVAPORATOR FLOW
MODEL
YCAS

MIN.

MAX.

0130EC

141

403

0140EC

141

403

0150EC

180

0160EC
0170EC

MAX

4.5

EVAPORATOR FLOW

MODEL

GALLONS/MINUTE

MIN

LITERS/SECOND

YCAS

MIN.

MAX.

0130EC

8.9

25.43

0140EC

8.9

25.43

769

0150EC

11.3

48.45

141

403

0160EC

8.9

25.43

180

768

0170EC

11.3

48.45

0180EC

180

768

0180EC

11.3

48.45

0200EC

180

768

0200EC

11.3

48.45

0210EC

180

768

0210EC

11.3

48.45

0230EC

180

768

0230EC

11.3

48.45

–18

AIR

STANDARD FANS

115*

ENTERING

HIGH PRESS. FANS

115*

CONDENSER (°F)
FAN

STANDARD FANS

AIR
ENTERING

STANDARD FANS

CONDENSER (°C)
FAN

STANDARD FANS

AVAILABLE STATIC

HIGH PRESS. FANS OPTION 1

AVAILABLE STATIC

HIGH PRESS. FANS OPTION 1

PRESSURE (Pa)

HIGH PRESS. FANS OPTION 2

150

PRESSURE (Pa)

HIGH PRESS. FANS OPTION 2

150

LOW NOISE (4 PL)

SLOW SPEED FANS

ELECTRICAL THREE PHASE 60 Hz (V)

200

ELECTRICAL THREE PHASE 60 Hz (V)

230

380

460
575
* Maximum Ambient w/ High Ambient Kit is 130°F.

200

230

460
440

575
* Maximum Ambient w/ High Ambient Kit is 54°C.

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

ELECTRICAL DATA

OPTIONAL CONTROL
TRANSFORMER
CIRCUIT #1

CIRCUIT # 2

MULTIPLE POINT POWER SUPPLY CONNECTION

1T
Control
Transformer
Options:
Term. Block
NF Disc SW
or Circ Brkr

Suitable for:
Y - ∆ Start and
Across-The-Line-Start

Options:
Term. Block
NF Disc SW
or Circ Brkr
2

Two field provided power supply circuits to the unit. Field
Power Wiring connections to factory provided, Non-Fused
Dis con nect Switches (Opt), Circuit Breakers (Opt) or
Terminal Blocks (Opt).

GRD

CTB

SEE NOTE 3

FIELD PROVIDED
UNIT POWER SUPPLY

SEE NOTE 3

STD FIELD PROVIDED
120-1-60Hz POWER SUPPLY (NOT REQUIRED IF
OPTIONAL CONTROL
TRANSFORMER FITTED)

FIELD PROVIDED
UNIT POWER SUPPLY

See page 62 for notes.
LD05548

MULTIPLE POINT POWER SUPPLY CONNECTION - 2 COMPRESSOR UNITS
(Two Field Provided Power Supply Circuits To The Chiller. Field Connections to Factory Provided Terminal Block (Std), Disconnects (Opt),
or Individual System Circuit Breakers (Opt) in each of the two Motor Control Centers.)
SYSTEM #1 FIELD-SUPPLIED WIRING
MODEL
YCAS

0130EC

0140EC

0150EC

0160EC

0170EC

0180EC

0200EC

0210EC

0230EC

FIELD PROVIDED POWER SUPPLY
OVER-CURRENT
VOLTS
MIN NF
PROTECTION
MCA1
2, 9
DISC SW
MIN.3, 5 MAX.4, 6
200
340
400
450
500
230
299
400
400
500
380
181
200
225
300
460
150
150
200
250
575
119
150
150
200
200
366
400
450
600
230
321
400
400
500
380
195
200
250
300
460
161
200
200
250
575
128
150
175
200
200
402
400
500
600
230
351
400
450
600
380
213
250
300
350
460
176
200
225
300
575
141
150
175
225
200
402
400
500
600
230
351
400
450
600
380
213
250
300
350
460
176
200
225
300
575
141
150
175
225
200
434
600
600
700
230
380
400
450
600
380
230
250
300
350
460
191
200
250
300
575
152
150
200
250
200
434
600
600
700
230
380
400
450
600
380
230
250
300
350
460
191
200
250
300
575
152
150
200
250
200
469
600
600
800
230
412
400
500
700
380
250
250
300
400
460
206
200
250
350
575
164
200
200
250
200
509
600
700
800
230
445
600
600
700
380
270
400
350
450
460
224
250
300
350
575
178
200
225
300
200
509
600
700
800
230
445
600
600
700
380
270
400
350
450
460
224
250
300
350
575
178
200
225
300

FACTORY PROVIDED (LUGS) WIRE RANGE7
STD. TERMINAL
BLOCK
(2)1/0 - 300
2/0 - (2) 4/0
1/0 - 300
# 2 - 4/0
# 2 - 4/0
(2) 1/0 - 300
2/0 - (2) 4/0
1/0 - 300
# 2 - 4/0
# 2 - 4/0
(2) 2/0 - 500
(2) 1/0 - 300
2/0 - 500
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) 1/0 - 300
# 1 - 300
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) # 1 - 300
2/0 - 500
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
# 1 - 300
1/0 - 300
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
2/0 - 500
1/0 - 300
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
2/0 - 500
1/0 - 300

OPT. NF.
DISC SW.
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 4 - 300
# 4 - 300
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 4 - 300
# 4 - 300
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 4 - 300
# 4 - 300
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350

COMPRESSOR

OPT. C.B.

RLA Y-LRA

(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 4 - 300
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
(2) 3/0-250
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
(2) 3/0-250
# 6 - 350

246
214
130
107
86
267
232
140
116
93
295
256
155
128
103
295
256
155
128
103
321
279
169
140
112
321
279
169
140
112
342
298
181
149
119
374
325
197
163
130
374
325
197
163
130

591
481
285
228
182
591
481
285
228
182
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224

FANS11, 12

FLA LRA
X-LRA QTY (EA.) (EA.)
N/A
4
8.2
38.0
N/A
4
7.8
33.0
900
4
4.8
23.0
719
4
4.0
19.0
574
4
3.1
15.2
N/A
4
8.2
38.0
N/A
4
7.8
33.0
900
4
4.8
23.0
719
4
4.0
19.0
574
4
3.1
15.2
N/A
4
8.2
38.0
N/A
4
7.8
33.0
1093
4
4.8
23.0
893
4
4.0
19.0
714
4
3.1
15.2
N/A
4
8.2
38.0
N/A
4
7.8
33.0
1093
4
4.8
23.0
893
4
4.0
19.0
714
4
3.1
15.2
N/A
4
8.2
38.0
N/A
4
7.8
33.0
1093
4
4.8
23.0
893
4
4.0
19.0
714
4
3.1
15.2
N/A
4
8.2
38.0
N/A
4
7.8
33.0
1093
4
4.8
23.0
893
4
4.0
19.0
714
4
3.1
15.2
N/A
5
8.2
38.0
N/A
5
7.8
33.0
1093
5
4.8
23.0
893
5
4.0
19.0
714
5
3.1
15.2
N/A
5
8.2
38.0
N/A
5
7.8
33.0
1093
5
4.8
23.0
893
5
4.0
19.0
714
5
3.1
15.2
N/A
5
8.2
38.0
N/A
5
7.8
33.0
1093
5
4.8
23.0
893
5
4.0
19.0
714
5
3.1
15.2

See page 62 for Electrical Data footnotes.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

ELECTRICAL DATA

SYSTEM #2 FIELD-SUPPLIED WIRING
MODEL
YCAS

0130EC

0140EC

0150EC

0160EC

0170EC

0180EC

0200EC

0210EC

0230EC

FIELD PROVIDED POWER SUPPLY
OVER-CURRENT
VOLTS
MIN NF
MCA1
PROTECTION
DISC SW2, 9
MIN.3, 5 MAX.4, 6
200
343
400
450
500
230
298
400
400
500
380
180
200
225
300
460
149
150
200
250
575
119
150
150
200
200
368
400
450
600
230
320
400
400
500
380
194
200
250
300
460
160
200
200
250
575
128
150
175
200
200
366
400
450
600
230
318
400
400
500
380
192
200
250
300
460
159
150
200
250
575
127
150
175
200
200
404
400
500
600
230
350
400
450
600
380
212
200
300
350
460
175
200
225
300
575
141
150
175
225
200
404
400
500
600
230
350
400
450
600
380
212
200
300
350
460
175
200
225
300
575
141
150
175
225
200
436
600
600
700
230
379
400
450
600
380
230
250
300
350
460
190
200
250
300
575
152
150
200
250
200
471
600
600
800
230
411
400
500
700
380
249
250
300
400
460
205
200
250
350
575
164
200
200
250
200
471
600
600
800
230
411
400
500
700
380
249
250
300
400
460
205
200
250
350
575
164
200
200
250
200
511
600
700
800
230
444
600
600
700
380
269
400
350
450
460
223
250
300
350
575
178
200
225
300

YORK INTERNATIONAL

FACTORY PROVIDED (LUGS) WIRE RANGE7
STD. TERMINAL
BLOCK
(2) 1/0 - 300
2/0 - (2) 4/0
1/0 - 300
# 2 - 4/0
# 2 - 4/0
(2) 1/0 - 300
2/0 - (2) 4/0
1/0 - 300
# 2 - 4/0
# 2 - 4/0
(2) 1/0 - 300
(2) 1/0 - 300
1/0 - 300
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) 1/0 - 300
2/0 - 500
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) 1/0 - 300
# 1 - 300
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
1/0 - 300
# 2 - 4/0
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
2/0 - 500
1/0 - 300
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
# 1 -300
1/0 - 300
(2) 2/0 - 500
(2) 2/0 - 500
2/0 - 500
2/0 - 500
1/0 - 300

OPT. NF.
DISC SW.
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 4 - 300
# 4 - 300
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 4 - 300
# 4 - 300
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(2) 3/0-250
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 6 - 350
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350

COMPRESSOR

OPT. C.B.

RLA Y-LRA

(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
# 4 - 300
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
# 6 - 350
# 6 - 350
(3) 2/0-400
(3) 2/0-400
(2) 3/0-250
(2) 3/0-250
# 6 - 350

246
214
130
107
86
267
232
140
116
93
265
230
139
115
92
295
256
155
128
103
295
256
155
128
103
321
279
169
140
112
342
298
181
149
119
342
298
181
149
119
374
325
197
163
130

591
481
285
228
182
591
481
285
228
182
591
481
285
228
182
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224

FANS11, 12

FLA
X-LRA QTY (EA.)
N/A
4
8.2
N/A
4
7.8
900
4
4.8
719
4
4.0
574
4
3.1
N/A
4
8.2
N/A
4
7.8
900
4
4.8
719
4
4.0
574
4
3.1
N/A
4
8.2
N/A
4
7.8
900
4
4.8
719
4
4.0
574
4
3.1
N/A
4
8.2
N/A
4
7.8
1093
4
4.8
893
4
4.0
714
4
3.1
N/A
4
8.2
N/A
4
7.8
1093
4
4.8
893
4
4.0
714
4
3.1
N/A
4
8.2
N/A
4
7.8
1093
4
4.8
893
4
4.0
714
4
3.1
N/A
5
8.2
N/A
5
7.8
1093
5
4.8
893
5
4.0
714
5
3.1
N/A
5
8.2
N/A
5
7.8
1093
5
4.8
893
5
4.0
714
5
3.1
N/A
5
8.2
N/A
5
7.8
1093
5
4.8
893
5
4.0
714
5
3.1

LRA
(EA.)
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2

Technical Data

FORM 201.19-NM1 (204)

ELECTRICAL DATA
OPTIONAL SINGLE-POINT POWER SUPPLY
CONNECTION AND INDIVIDUAL SYSTEM CIRCUIT
BREAKERS
Suitable for:
Y - ∆ Start and
Across-The-Line-Start

LD05549

One field provided power supply circuit to the unit.
Field con nec tions to factory pro vid ed Non-Fused
Disconnect Switch (Opt), or Terminal Block (Opt).
Factory connections to Circuit Breakers on Terminal
Blocks in each of the two Power Panels.
See page 62 for notes.

OPTIONAL SINGLE-POINT POWER SUPPLY WITH INDIVIDUAL SYSTEM CIRCUIT BREAKERS –
2 COMPRESSOR UNITS
(One Field Provided Power Supply Circuit to the chiller. Field connections to Factory Provided Terminal Block (standard) or Non-Fused Disconnect (option).
Individual System Circuit Breakers in each Motor Control Center10)
CHILLER
MODEL
YCAS

0130EC

0140EC

0150EC

0160EC

0170EC

0180EC

0200EC

0210EC

0230EC

VOLTS
MCA1
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575

619.3
543.9
329.8
272.8
217.4
665.9
584.4
354.3
293.0
233.6
698.9
612.4
371.4
307.0
245.6
729.4
638.4
387.2
320.0
256.6
761.9
667.2
404.7
335.0
267.8
787.9
690.2
418.7
347.0
276.8
851.5
748.5
455.3
375.3
298.8
891.5
782.3
475.3
392.8
312.5
923.5
809.3
491.3
406.8
323.5

FIELD PROVIDED POWER SUPPLY
MIN NF
OVER-CURRENT PROTECTION13
DISC SW2, 9
MIN.3, 5
MAX.4, 6
800
700
700
600
600
700
400
400
450
400
300
350
250
250
300
800
800
800
800
700
800
400
400
450
400
350
400
250
300
300
800
800
800
800
700
800
400
450
500
400
350
400
400
300
300
800
1000
800
800
800
800
600
450
500
400
400
400
400
300
300
800
1000
1000
800
800
800
600
450
500
400
400
400
400
300
350
1000
1000
1000
800
800
800
600
500
500
400
400
450
400
350
350
1000
1000
1000
800
1000
800
600
600
500
400
450
450
400
350
350
1000
1000
1000
1000
1000
1000
600
600
600
600
450
500
400
350
400
1000
1200
1200
1000
1000
1000
600
600
600
600
450
500
400
400
450

FIELD-SUPPLIED WIRING
FACTORY PROVIDED (LUGS) WIRE RANGE 7
STANDARD
OPTIONAL NF
TERMINAL BLOCK
DISC. SWITCH
(3) 2/0 - 500
(3) 2/0-400
(2) 2/0 - 500
(2) 250-500
(2) 1/0 - 300
(2) 3/0-250
2/0 - 500
(2) 3/0-250
2/0 - 500
# 6 - 350
(3) 2/0 - 500
(3) 2/0-400
(3) 2/0 - 500
(2) 250-500
(2) 1/0 - 300
(2) 3/0-250
(2) 1/0 - 300
(2) 3/0-250
2/0 - 500
# 6 - 350
(3) 2/0 - 500
(3) 2/0-400
(3) 2/0 - 500
(3) 2/0-400
(2) 2/0 - 500
(2) 3/0-250
(2) 1/0 - 300
(2) 3/0-250
2/0 - 500
(2) 3/0-250
(3) 2/0 - 500
(3) 2/0-400
(3) 2/0 - 500
(3) 2/0-400
(2) 2/0 - 500
(2) 250-500
(2) 1/0 - 300
(2) 3/0-250
2/0 - 500
(2) 3/0-250
(3) 2/0 - 500
(3) 2/0-400
(3) 2/0 - 500
(3) 2/0-400
(2) 2/0 - 500
(2) 250-500
(2) 1/0 - 300
(2) 3/0-250
2/0 - 500
(2) 3/0-250
N/A
N/A
N/A
N/A
(2) 2/0 - 500
(2) 250-500
(2) 1/0 - 300
(2) 3/0-250
(2) 1/0 - 300
(2) 3/0-250
N/A
N/A
N/A
N/A
(2) 2/0 - 500
(2) 250-500
(2) 2/0 - 500
(2) 3/0-250
(2) 1/0 - 300
(2) 3/0-250
N/A
N/A
N/A
N/A
(2) 2/0 - 500
(2) 250-500
(2) 2/0 - 500
(2) 250-500
(2) 1/0 - 300
(2) 3/0-250
N/A
N/A
N/A
N/A
(2) 2/0 - 500
(2) 250-500
(2) 2/0 - 500
(2) 250-500
(2) 1/0 - 300
(2) 3/0-250

See page 62 for Electrical Data footnotes.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

ELECTRICAL DATA

SYSTEM #1
MODEL
YCAS

0130EC

0140EC

0150EC

0160EC

0170EC

0180EC

0200EC

0210EC

0230EC

RLA
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575

YORK INTERNATIONAL

SYSTEM #2

COMPRESSOR DATA

VOLTS

246.1
214.0
129.5
107.0
85.6
266.8
232.0
140.4
116.0
92.8
295.0
256.0
155.0
128.0
103.0
295.0
256.0
155.0
128.0
103.0
321.0
279.0
169.0
140.0
112.0
321.0
279.0
169.0
140.0
112.0
342.0
298.0
181.0
149.0
119.0
374.0
325.0
197.0
163.0
130.0
374.0
325.0
197.0
163.0
130.0

Y-LRA
591
481
285
228
182
591
481
285
228
182
708
642
343
280
224
708
642
343
280
224
708
642
343
280
224
N/A
N/A
343
280
224
N/A
N/A
343
280
224
N/A
N/A
343
280
224
N/A
N/A
343
280
224

FAN DATA11, 12

X-LRA

QTY

FLA
(EA.)

1866
1518
900
719
574
1866
1518
900
719
574
2256
2045
1093
893
714
2256
2045
1093
893
714
2256
2045
1093
893
714
N/A
N/A
1093
893
714
N/A
N/A
1093
893
714
N/A
N/A
1093
893
714
N/A
N/A
1093
893
714

4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5

8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1

COMPRESSOR DATA
LRA
(EA)

RLA

38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2

246.1
214.0
129.5
107.0
85.6
266.8
232.0
140.4
116.0
92.8
264.5
230.0
139.2
115.0
92.0
295.0
256.0
155.0
128.0
103.0
295.0
256.0
155.0
128.0
103.0
321.0
279.0
169.0
140.0
112.0
342.0
298.0
181.0
149.0
119.0
342.0
298.0
181.0
149.0
119.0
374.0
325.0
197.0
163.0
130.0

Y-LRA

X-LRA

591
481
285
228
182
591
481
285
228
182
591
481
285
228
182
708
642
343
280
224
708
642
343
280
224
N/A
N/A
343
280
224
N/A
N/A
343
280
224
N/A
N/A
343
280
224
N/A
N/A
343
280
224

1866
1518
900
719
574
1866
1518
900
719
574
1866
1518
900
719
574
2256
2045
1093
893
714
2256
2045
1093
893
714
N/A
N/A
1093
893
714
N/A
N/A
1093
893
714
N/A
N/A
1093
893
714
N/A
N/A
1093
893
714

FAN DATA11, 12
FLA
QTY
(EA)
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5

8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1
8.2
7.8
4.8
4.0
3.1

LRA
(EA)
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2
38.0
33.0
23.0
19.0
15.2

Technical Data

FORM 201.19-NM1 (204)

ELECTRICAL DATA
OPTIONAL SINGLE-POINT POWER SUPPLY
CONNECTION WITH FIELD SUPPLIED CIRCUIT
PROTECTION
Suitable for:
Y - ∆ Start and
Across-The-Line-Start

One field provided power supply circuit to the unit.
Field con nec tions to fac to ry pro vid ed Non-Fused
Disconnect Switch (Opt), or Terminal Block (Opt).
Factory connections to Terminal Blocks in each of the
two Power Panels.
See page 62 for notes.

LD05550

OPTIONAL SINGLE-POINT POWER SUPPLY CONNECTION – 2 COMPRESSOR UNITS
(One Field Provided Power Supply Circuit to the Chiller. Field connections to Factory Provided Terminal Block (Standard) or Non-Fused Disconnect (option).
No Internal Branch Circuit Protection (Breakers) per Motor Control Center10)

CHILLER
MODEL
YCAS
0130EC
0140EC
0150EC
0160EC
0170EC
0180EC
0200EC
0210EC
0230EC

VOLTS
MCA1
460
575
460
575
460
575
460
575
460
575
460
575
460
575
460
575
460
575

273
217
293
234
307
246
320
257
335
268
347
277
375
299
393
313
407
324

FIELD PROVIDED POWER SUPPLY
MIN NF
OVER-CURRENT PROTECTION13
DISC SW2, 9
MIN.3, 5
MAX.4, 6
400
300
350
250
250
300
400
350
400
250
300
300
400
350
400
400
300
300
400
400
400
400
300
350
400
400
450
400
300
350
400
400
450
400
350
350
400
450
500
400
350
400
600
450
500
400
350
400
600
450
500
400
400
450

FIELD-SUPPLIED WIRING
FACTORY PROVIDED (LUGS) WIRE RANGE 7
STANDARD
OPTIONAL NF
TERMINAL BLOCK
DISC. SWITCH
# 1 - 500
(2) 3/0-250
# 1 - 500
# 6 - 350
(2) # 2 - 300
(2) 3/0-250
# 1 - 500
# 6 - 350
(2) # 2 - 300
(2) 3/0-250
# 1 - 500
(2) 3/0-250
(2) # 2 - 300
(2) 3/0-250
# 1 - 500
(2) 3/0-250
(2) # 2 - 300
(2) 3/0-250
# 1 - 500
(2) 3/0-250
(2) # 2 - 300
(2) 3/0-250
(2) # 2 - 300
(2) 3/0-250
(2) # 1 - 500
(2) 3/0-250
(2) # 2 - 300
(2) 3/0-250
(2) # 1 - 500
(2) 250-500
(2) # 2 - 300
(2) 3/0-250
(2) # 1 - 500
(2) 250-500
(2) # 2 - 300
(2) 3/0-250

See page 62 for Electrical Data footnotes.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

ELECTRICAL DATA

SYSTEM #1
MODEL
YCAS

0130EC
0140EC
0150EC
0160EC
0170EC
0180EC
0200EC
0210EC
0230EC

VOLTS
460
575
460
575
460
575
460
575
460
575
460
575
460
575
460
575
460
575

YORK INTERNATIONAL

SYSTEM #2

COMPRESSOR DATA

FAN DATA11, 12

RLA

X-LRA

QTY

FLA
(EA.)

107
86
116
93
128
103
128
103
140
112
140
112
149
119
163
130
163
130

719
574
719
574
893
714
893
714
893
714
893
714
893
714
893
714
893
714

4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5

4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1

COMPRESSOR DATA
LRA
(EA)

RLA

X-LRA

19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2

107
86
116
93
115
92
128
103
128
103
140
112
149
119
149
119
163
130

719
574
719
574
719
574
893
714
893
714
893
714
893
714
893
714
893
714

FAN DATA11,12
FLA
QTY
(EA)
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5

4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1
4.0
3.1

LRA
(EA)
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2
19.0
15.2

Technical Data

FORM 201.19-NM1 (204)

ELECTRICAL DATA
OPTIONAL SINGLE-POINT POWER SUPPLY
CONNECTION TO FACTORY CIRCUIT BREAKER
Suitable for:
Across-The-Line-Start

One field provided power supply circuit to the unit. Field
connections to factory provided Circuit Breaker in the
Options Panel. Factory connections to Terminal Blocks
in each of the two Power Panels.
See page 62 for notes.

LD05551

OPTIONAL SINGLE-POINT POWER SUPPLY CONNECTION TO FACTORY CIRCUIT BREAKER –
2 COMPRESSOR UNITS
(One Field Provided Power Supply Circuit to the chiller. Field Connections to Factory Provided Circuit Breaker.
No Internal Branch Circuit Protection (Breakers) per Motor Control Center10.)

MODEL
YCAS
0130EC
0140EC
0150EC
0160EC
0170EC
0180EC
0200EC
0210EC
0230EC

VOLTS
460
575
460
575
460
575
460
575
460
575
460
575
460
575
460
575
460
575

MCA1
273
217
293
234
307
246
320
257
335
268
347
277
375
299
393
313
407
324

FIELD SUPPLIED WIRING
FACTORY SUPPLIED BREAKER
RATING2
WIRE RANGE7 (LUGS)
400
(2) 3/0-250
250
# 6 - 350
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
400
(2) 3/0-250
600
(3) 2/0-400
400
(2) 3/0-250
600
(3) 2/0-400
400
(2) 3/0-250
600
(3) 2/0-400
400
(2) 3/0-250

SYSTEM #1
SYSTEM #2
COMPRESSOR
FANS11, 12
COMPRESSOR
FANS11, 12
RLA
X-LRA QTY FLA(ea) LRA(ea) RLA X-LRA QTY FLA(ea) LRA(ea)
107
719
4
4.0
19.0
107
719
4
4.0
19.0
86
574
4
3.1
15.2
86
574
4
3.1
15.2
116
719
4
4.0
19.0
116
719
4
4.0
19.0
93
574
4
3.1
15.2
93
574
4
3.1
15.2
128
893
4
4.0
19.0
115
719
4
4.0
19.0
103
714
4
3.1
15.2
92
574
4
3.1
15.2
128
893
4
4.0
19.0
128
893
4
4.0
19.0
103
714
4
3.1
15.2
103
714
4
3.1
15.2
140
893
4
4.0
19.0
128
893
4
4.0
19.0
112
714
4
3.1
15.2
103
714
4
3.1
15.2
140
893
4
4.0
19.0
140
893
4
4.0
19.0
112
714
4
3.1
15.2
112
714
4
3.1
15.2
149
893
5
4.0
19.0
149
893
5
4.0
19.0
119
714
5
3.1
15.2
119
714
5
3.1
15.2
163
893
5
4.0
19.0
149
893
5
4.0
19.0
130
714
5
3.1
15.2
119
714
5
3.1
15.2
163
893
5
4.0
19.0
163
893
5
4.0
19.0
130
714
5
3.1
15.2
130
714
5
3.1
15.2

NOTES: Wye-Delta Compressor Start not available with this option.
See page 62 for Electrical Data footnotes.

NOTES:
1. – – – – – – – Dashed Line indicates Field Provided Wiring.
2. The above recommendations are based on the National Electric Code and using copper connectors only.
Field wiring must also comply with local codes.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

ELECTRICAL DATA
COMPRESSOR DATA

VOLTAGE CODEMAX kW
MAX AMPS

MAXIMUM kW AND AMPERAGE VALUES FOR DXST COMPRESSORS
COMPRESSOR MODEL AND VOLTAGE CODE
DXS45LA – MOTOR CODE A
DXS36LA – MOTOR CODE A
DXS24LA – MOTOR CODE (TBD)
(B5N, B5E, B6N, B6E)
(A5N, A5E, A6N, A6E)
(C5N, C5E, C6N, C6E)
-17 -28 -40 -46 -50 -58 -17 -28 -40 -46 -50 -58 -17 -28 -40 -46 -50 -56
150 150 150 150 113 150 150 150 150 150 113 150 105 105 105 105 80 105
492 428 259 214 193 171 492 428 259 214 193 171 338 294 178 147 135 118

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

ELECTRICAL NOTES
NOTES & LEGEND
LEGEND
ACR-LINE
C.B.
D.E.
DISC SW
FACT CB
FLA
HZ
MAX
MCA
MIN
MIN NF
RLA
S.P. WIRE
Y-∆
X-LRA
Y-LRA

ACROSS THE LINE START
CIRCUIT BREAKER
DUAL ELEMENT FUSE
DISCONNECT SWITCH
FACTORY-MOUNTED CIRCUIT BREAKER
FULL LOAD AMPS
HERTZ
MAXIMUM
MINIMUM CIRCUIT AMPACITY
MINIMUM
MINIMUM NON-FUSED
RUNNING LOAD AMPS
SINGLE-POINT WIRING
WYE-DELTA START
ACROSS-THE-LINE INRUSH LOCKED ROTOR AMPS
WYE-DELTA INRUSH LOCKED ROTOR AMPS

VOLTAGE CODE
-17 = 200-3-60
-28 = 230-3-60
-40 = 380-3-60
-46 = 460-3-60
-58 = 575-3-60

CONTROL POWER SUPPLY (UNITS WITHOUT STANDARD CONTROL CIRCUIT TRANSFORMER)
NO. OF
COMPRESSORS

CONTROL
POWER
SUPPLY

MCA
(MAX LOAD
CURRENT)

MAX DUAL
ELEMENT
FUSE SIZE

NON-FUSED
DISCONNECT
SWITCH SIZE

115V-1Ø

20A

NOTES:
1. Minimum circuit ampacity (MCA) is based on 125% of the rated load amps for the largest motor plus 100% of the rated load amps for all
other loads included in the circuit, per N.E.C. Article 430-24. If a Factory Mounted Control Transformer is provided, add the following to the
system #1 MCA values in the YCAS Tables: -17, add 15 amps; -28, add 12 amps; -40, add 7 amps; -46, add 6 amps; -58, add 5 amps.
2. The recommended disconnect switch is based on a minimum of 115% of the summation rated load amps of all the loads included in the circuit,
per N.E.C. 440 - 12A1.
3. Minimum recommended fuse size is based on 150% of the largest motor RLA plus 100% of the remaining RLAs. Minimum fuse rating = (1.5
x largest compressor RLA) + other compressor RLAs + (# fans x each fan motor FLA).
4. Maximum dual element fuse size is based on 225% maximum plus 100% of the rated load amps for all other loads included in the circuit, per
N.E.C. 440-22. Maximum fuse rating = (2.25 x largest compressor RLA) + other compressor RLAs + (# fans x each fan motor FLA).
5. Minimum recommended circuit breaker is 150% maximum plus 100% of rated load amps included in the circuit. Minimum circuit breaker rating
= (1.5 x largest compressor RLA) + other compressor RLAs + (# fans x each fan motor FLA).
6. Maximum circuit breaker is based on 225% maximum plus 100% of the rated load amps for all loads included in the circuit, per circuit, per
U.L. 1995 Fig. 36.2. Maximum circuit breaker rating = (2.25 x largest compressor RLA) + other compressor RLAs + ( # fans x each fan motor
FLA).
7. The Incoming Wire Range is the minimum and maximum wire size that can be accommodated by unit wiring lugs. The (1), (2), or (3) indicate
the number of termination points or lugs which are available per phase. Actual wire size and number of wires per phase must be determined
based on ampacity and job requirements using N.E.C. wire sizing information. The above recommendations are based on the National Electric
Code and using copper conductors only. Field wiring must also comply with local codes.
8. A ground lug is provided for each compressor system to accommodate field grounding conductor per N.E.C. Article 250-54. A control circuit
grounding lug is also supplied. Incoming ground wire range is #6 - 350 MCM.
9. The field supplied disconnect is a “Disconnecting Means” as defined in N.E.C. 100.B, and is intended for isolating the unit from the available
power supply to perform maintenance and troubleshooting. This disconnect is not intended to be a Load Break Device.
10. Two-Compressor machines with single-point power connection, and equipped with Star (Wye)-Delta Compressor motor start must also include
factory-provided individual system circuit breakers in each motor control center. All 3 & 4 Compressor machines equipped with Star-Delta
compressor motor start must also include factory-provided individual system circuit breakers in each motor control center.
11. Consult factory for Electrical Data on units equipped with “High Static Fan” option. High Static Fans are 3.8 kW each.
12. FLA for “Low Noise Fan” motors: 200V = 8.0A, 230V = 7.8A, 380V = 4.4A, 460V = 3.6A, 575V = 2.9A.
13. Group Rated breaker must be HACR type for cU.L. Machines.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

This page intentionally left blank.

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

WIRING DIAGRAM
7.

ACROSS-THE-LINE START

NOTES:

1. Field wiring to be in accordance with the current edition of
the National Electrical Code as well as all other applicable
codes and specifications.
2. Numbers along the right side of a diagram are line identification numbers. The numbers at each line indicate the line
number location of relay contacts. An unlined contact location signifies a normally closed contact. Numbers adjacent
to circuit lines are the circuit identification numbers.
3. Any customer supplied contacts must be suitable for
switching 24VDC. (Gold contacts recommended.) Control Wiring must not be run in the same conduit with any
line voltage wiring.
4. To cycle unit on and off automatically with contact
shown, install a cycling device in series with the flow
switch (FSLW). See Note 3 for contact rating and wiring
specifications. Also refer to cautions on page 67.
5. To stop unit (Emergency Stop) with contacts other than
those shown, install the stop contact between 5 and 1. If
a stop device is not installed, a jumper must be connected
between terminals 5 and 1. Device must have a minimum
contact rating of 100VA at 115 volts A.C.
6. Alarm contacts are for annunciating alarm/unit malfunction. Contacts are rated at 115V, 100VA, resistive load only,
and must be suppressed at load by user.
7. See Installation, Operation and Maintenance Manual when
optional equipment is used.

LD09231

LD09232

LEGEND
TS

Transient Voltage Suppression
Terminal Block for Customer Connections
Terminal Block for Customer Low Voltage
(Class 2) Connections. See Note 2
Terminal Block for YORK Connections Only
Wiring and Components by YORK
Optional Equipment
Wiring and/or Components by Others

8. Control panel to be securely connected to earth ground.
9. Use 2KVA transformer in optional transformer kit unless
there are optional oil separator sump heaters which necessitates using a 3KVA transformer.
FIG. 17 – WIRING DIAGRAM – ACROSS-THE-LINE START
64

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WIRING DIAGRAM
ACROSS-THE-LINE START

LD09233

FIG. 18 – WIRING DIAGRAM – ACROSS-THE-LINE START
YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

ELEMENTARY DIAGRAM

LD09234

FIG. 19 – ELEMENTARY DIAGRAM – ACROSS-THE-LINE START
66

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

ELEMENTARY DIAGRAM
CAUTION:
No Controls (relays, etc.) should
be mounted in the Smart Panel
enclosure or connected to power
supplies in the control panel.
Additionally, control wiring not
connected to the Smart Panel
should not be run through the
cabinet. This could re sult in
nuisance faults.

Any contacts connected to flow
switch inputs or BAS inputs on
terminals 13 - 19 or TB3, or any
other terminals, must be suppressed with a YORK P/N 03100808-000 suppressor across the
relay/contactor coil.

FANS

CAUTION:
Any inductive devices (relays)
wired in series with the flow
switch for start/stop, into the
Alarm circuitry, or pilot relays
for pump starters wired through
motor contactor auxiliary contacts must be suppressed with
YORK P/N 031-00808-000
sup pres sor across the re lay/
contactor coil.

YORK INTERNATIONAL

* All primary and secondary wiring between transformer and control panel included.

30A 240V
30A 240V
30A 480V
30A 600V
15A 250V
15A 250V
8A 600V
8A 600V
15A
15A
8A
8A
200-1-60
230-1-60
400-1-60
575-1-60

30A 240V
20A 250V
20A
115-1-50/60

NON-FUSED
DISC.
SWITCH SIZE
CONTROL
POWER
SUPPLY

MIN
CIRCUIT
AMP.

MAX DUAL
ELEMENT
FUSE SIZE

ALL MODELS
W/O TRANS.
MODELS
-17
WITH
-28
TRANS.
-46
*
-58

LD09235

UNIT
VOLTAGE

CONTROL POWER SUPPLY

CAUTION:
Control wiring connected to the
control panel should never be run
in the same conduit with power
wiring.

Technical Data

FORM 201.19-NM1 (204)

WIRING DIAGRAM
7.

WYE-DELTA START

NOTES:

1. Field wiring to be in accordance with the current edition of
the National Electrical Code as well as all other applicable
codes and specifications.
2. Numbers along the right side of a diagram are line identification numbers. The numbers at each line indicate the line
number location of relay contacts. An unlined contact location signifies a normally closed contact. Numbers adjacent
to circuit lines are the circuit identification numbers.
3. Any customer supplied contacts must be suitable for
switching 24VDC. (Gold contacts recommended.) Control Wiring must not be run in the same conduit with any
line voltage wiring.
4. To cycle unit on and off automatically with contact
shown, install a cycling device in series with the flow
switch (FSLW). See Note 3 for contact rating and wiring
specifications. Also refer to cautions on page 71.
5. To stop unit (Emergency Stop) with contacts other than
those shown, install the stop contact between 5 and 1. If
a stop device is not installed, a jumper must be connected
between terminals 5 and 1. Device must have a minimum
contact rating of 100VA at 115 volts A.C.
6. Alarm contacts are for annunciating alarm/unit malfunction. Contacts are rated at 115V, 100VA, resistive load only,
and must be suppressed at load by user.
7. See Installation, Operation and Maintenance Manual when
optional equipment is used.

LD09231

LD09232

LEGEND
TS

8. Control panel to be securely connected to earth ground.

FIG. 20 – WIRING DIAGRAM – WYE-DELTA START
68

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WIRING DIAGRAM
WYE-DELTA START

LD09236

FIG. 21 – ELEMENTARY DIAGRAM – WYE-DELTA START
YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

ELEMENTARY DIAGRAM

LD09234

FIG. 22 – ELEMENTARY DIAGRAM – WYE-DELTA START
70

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

FANS

YORK INTERNATIONAL

* All primary and secondary wiring between transformer and control panel included.

30A 240V
30A 240V
30A 480V
30A 600V
15A 250V
15A 250V
8A 600V
8A 600V
15A
15A
8A
8A
200-1-60
230-1-60
400-1-60
575-1-60

30A 240V
20A 250V
20A
115-1-50/60

NON-FUSED
DISC.
SWITCH SIZE
CONTROL
POWER
SUPPLY

MIN
CIRCUIT
AMP.

MAX DUAL
ELEMENT
FUSE SIZE

ALL MODELS
W/O TRANS.
MODELS
-17
WITH
-28
TRANS.
-46
*
-58

LD09235

UNIT
VOLTAGE

CONTROL POWER SUPPLY

CAUTION:
Control wiring con nect ed to
the control panel should never
be run in the same conduit with
power wiring.

Technical Data

FORM 201.19-NM1 (204)

LD09238

FIG. 22A – POWER PANEL (SYSTEM #1) COMPONENT LOCATIONS
72

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

FIG. 22B – CONTROL PANEL COMPONENT LOCATION
YORK INTERNATIONAL

LD09239

Technical Data

FORM 201.19-NM1 (204)

LD09240

FIG. 22C – POWER PANEL (SYSTEM #2) COMPONENT LOCATIONS
74

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

LEGEND

LD09241

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

LD03282

LD03283

2 ACE MOTOR
PROTECTOR MODULE

LD03284

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

CONNECTION DIAGRAM (SYSTEM WIRING)

LD09242

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

COMPRESSOR TERMINAL BOX

LD09243

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

ELEMENTARY DIAGRAM
CONTROL CIRCUIT

7
LD09373

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

ELEMENTARY DIAGRAM

#3/#4

#5/#6

#7/#8

#3/#4

#5/#6

#7/#8

#9/#10
LD06840

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

This page intentionally left blank.

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0130 - YCAS0180 (ENGLISH)
0P0.71

LD03742a

LD03742

DIMENSION
P

MODELS
130 - 140
17-1/4"

MODELS
150 - 180
18"

NOTES:
1. Placement on a level surface free of obstructions (including snow, for winter operation) or air recirculation ensures rated performance, reliable operation and ease of maintenance. Site restrictions may compromise minimum clearances indicated below, resulting in unpredictable
air flow patterns and possible diminished performance. YORK’s unit controls will optimize operation without nuisance high pressure safety
cutout; however, the system designer must consider potential performance degradation. Access to the unit control center assumes the unit is
no higher than on spring isolators. Recommended minimum clearances: Side to wall - 6'; rear to wall - 6'; control panel end to wall - 4'; top
- no obstructions allowed; distance between adjacent units - 10'. No more than one adjacent wall may be higher than the unit.

FIG. 23 – MODEL YCAS0130 - 0180 DIMENSIONS (ENGLISH)
82

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0130 - YCAS0180 (ENGLISH)

CONTROL/OPTIONS

LD03743

CENTER OF GRAVITY (Alum.)
YCAS
X
Y
Z
0130 101.3" 44.4" 37.8"
0140 101.3" 44.4" 37.8"
0150 106.7" 42.8" 36.2"
0160 107.0" 43.0" 36.2"
0170 107.0" 43.0" 36.2"
0180 107.0" 43.0" 36.2"

CENTER OF GRAVITY (Copper)

YCAS
0130
0140
0150
0160
0170
0180

X
103.5"
103.5"
108.2"
108.4"
108.4"
108.4"

Y
44.4"
44.4"
43.0"
43.1"
43.1"
43.1"

Z
40.7"
40.7"
39.2"
39.1"
39.1"
39.1"

LD03744

YORK INTERNATIONAL

Technical Data

All dimensions
are in mm unless
otherwise noted.

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0130 - YCAS0180 (SI)

LD03745a

46 (EDGE OF
UNIT TO COOLER
CONNECTION

DIMENSION
P

MODELS
130 - 140
438

MODELS
150 - 180
457

NOTES:
1. Placement on a level surface free of obstructions (including snow, for winter operation) or air recirculation ensures rated performance, reliable operation and ease of maintenance. Site restrictions may compromise minimum clearances indicated below, resulting in unpredictable
air flow patterns and possible diminished performance. YORK’s unit controls will optimize operation without nuisance high pressure safety
cutout; however, the system designer must consider potential performance degradation. Access to the unit control center assumes the unit is
no higher than on spring isolators. Recommended minimum clearances: Side to wall - 2m; rear to wall - 2m; control panel end to wall - 1.2m;
top - no obstructions allowed; distance between adjacent units - 3m. No more than one adjacent wall may be higher than the unit.

FIG. 24 – MODEL YCAS0130 - 0180 DIMENSIONS (SI)
84

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0130 - YCAS0180 (SI)

$"&

LD03746

CENTER OF GRAVITY (Alum.)
YCAS
X
Y
Z
0130 2573.0 1127.8 960.1
0140 2573.0 1127.8 960.1
0150 2710.2 1087.1 919.5
0160 2717.8 1092.2 919.5
0170 2717.8 1092.2 919.5
0180 2717.8 1092.2 919.5

CENTER OF GRAVITY (Copper)
YCAS
X
Y
Z
0130 2628.9 1127.8 1033.8
0140 2628.9 1127.8 1033.8
0150 2748.3 1092.2 995.7
0160 2573.4 1094.7 993.1
0170 2573.4 1094.7 993.1
0180 2573.4 1094.7 993.1

LD03747

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0200 - YCAS0230 (ENGLISH)

LD03748a

SYS.#1
COILS

MICRO-COMPUTER
CONTROL CENTER

SYS.#2
COILS

C
OPTIONS PANEL

18"

1 11/16"

88"
91 3/8"

15/16" (EDGE OF
UNIT TO COOLER
CONNECTION)

VIEW A-A
LD03748

NOTES:
1. Placement on a level surface free of obstructions (including snow, for winter operation) or air recirculation ensures rated performance, reliable operation and ease of maintenance. Site restrictions may compromise minimum clearances indicated below, resulting in unpredictable
air flow patterns and possible diminished performance. YORK’s unit controls will optimize operation without nuisance high pressure safety
cutout; however, the system designer must consider potential performance degradation. Access to the unit control center assumes the unit
is no higher than on spring isolators. Recommended minimum clearances: Side to wall - 6'; rear to wall - 6'; control panel end to wall - 4'; top
- no obstructions allowed; distance between adjacent units - 10'. No more than one adjacent wall may be higher than the unit.

FIG. 25 – MODEL YCAS0200 - YCAS0230 DIMENSIONS (ENGLISH)
86

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0200 - YCAS0230 (ENGLISH)

LD03749

CENTER OF GRAVITY (Alum.)
YCAS
X
Y
Z
0200 119.4" 43.2" 38.0"
0210 119.4" 43.2" 38.0"
0230 119.4" 43.2" 38.0"

CENTER OF GRAVITY (Copper)

YCAS
0200
0210
0230

X
122.3"
122.3"
122.3"

Y
43.3"
43.3"
43.3"

Z
41.0"
41.0"
41.0"

LD03750

YORK INTERNATIONAL

Technical Data

All dimensions
are in mm unless
otherwise noted.

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0200 - YCAS0230 (SI)

LD03751a

CONTROL ENTRY
(8) 22 DIA. HOLES

VIEW B-B

SYS.#1
COILS

MICRO-COMPUTER
CONTROL CENTER

SYS.#2
COILS

OPTIONS PANEL
B

457

2235
2321

24 (EDGE OF
UNIT TO COOLER
CONNECTION)

VIEW A-A
LD03751

NOTES:
1. Placement on a level surface free of obstructions (including snow, for winter operation) or air recirculation ensures rated performance, reliable
operation and ease of maintenance. Site restrictions may compromise minimum clearances indicated below, resulting in unpredictable air flow
patterns and possible diminished performance. YORK’s unit controls will optimize operation without nuisance high pressure safety cutout;
however, the system designer must consider potential performance degradation. Access to the unit control center assumes the unit is no
higher than on spring isolators. Recommended minimum clearances: Side to wall - 2m; rear to wall - 2m; control panel end to wall - 1.2m;
top - no obstructions allowed; distance between adjacent units - 3m. No more than one adjacent wall may be higher than the unit.

FIG. 26 – MODEL YCAS0200 - YCAS0230 DIMENSIONS (SI)
88

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

DIMENSIONS – YCAS0200 - YCAS0230 (SI)

$"&

LD03752

CENTER OF GRAVITY (Alum.)
YCAS
X
Y
Z
0200 3032.8 1097.3 965.2
0210 3032.8 1097.3 965.2
0230 3032.8 1097.3 965.2

CENTER OF GRAVITY (Copper)

YCAS
0200
0210
0230

X
Y
Z
3106.4 1099.8 1041.4
3106.4 1099.8 1041.4
3106.4 1099.8 1041.4

LD03753

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

TECHNICAL DATA

(2 m)

CLEARANCES

(2 m)

(1.3 m)

LD07011

NOTES:
1. No obstructions allowed above the unit.
2. Only one adjacent wall may be higher than the unit.
3. Adjacent units should be 10 feet (3 meters) apart.

FIG. 27 – CLEARANCES

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminium and Black Fin Condenser Coils

LD09472

ALUMINUM FIN COIL WEIGHT DISTRIBUTION BY MODEL ( LBS )
YCAS

TOTAL

0130
0140
0150
0160
0170
0180
0200
0210
0230

1,956
1,963
1,868
1,892
1,903
1,907
2,188
2,204
2,206

1,633
1,638
1,648
1,677
1,689
1,693
1,881
1,896
1,897

1,309
1,313
1,428
1,462
1,475
1,479
1,573
1,587
1,587

986
989
1,208
1,248
1,261
1,265
1,265
1,279
1,278

1,908
1,931
1,958
1,955
1,982
1,994
2,247
2,270
2,280

1,593
1,612
1,727
1,733
1,759
1,770
1,931
1,952
1,961

1,277
1,292
1,497
1,511
1,536
1,546
1,615
1,635
1,641

962
973
1,266
1,289
1,313
1,323
1,299
1,318
1,321

––
––
––
––
––
––
––
––
––

11,625
11,711
12,599
12,768
12,919
12,978
13,998
14,141
14,171

YCAS

TOTAL

741
743
748
761
766
768
853
860
861

594
596
648
663
669
671
714
720
720

447
449
548
566
572
574
574
580
580

865
876
888
887
899
904
1,019
1,030
1,034

723
731
783
786
798
803
876
885
890

579
586
679
685
697
701
733
742
744

436
441
574
585
596
600
589
589
599

––
––
––
––
––
––
––
––
––

5,273
5,312
5,714
5,791
5,860
5,886
6,349
6,414
6,428

ALUMINUM FIN COIL WEIGHT DISTRIBUTION BY MODEL ( KGS )
0130 887
0140 890
0150 847
0160 858
0170 863
0180 865
0200 992
0210 1,000
0230 1,001

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminium and Black Fin Condenser Coils
ALUMINUM FINS, 1" ISOLATOR SELECTIONS – VMC TYPE CP-2-XX (SEE TABLE BELOW)
YCAS
0130
0140
0150
0160
0170
0180
0200
0210
0230

A
31
31
31
31
31
31
31
31
31

B
28
28
28
28
28
28
28
28
28

C
27
27
27
27
27
27
28
28
28

D
26
26
27
27
27
27
28
28
28

E
31
31
31
31
31
31
31
31
31

F
27
27
27
27
27
27
28
28
28

G
28
28
28
28
28
28
31
31
31

H
26
26
27
27
27
27
28
28
28

ISOLATOR
TYPE & SIZE

MAX LOAD
lbs.
kg

CP-2-26
CP-2-27
CP-2-28
CP-2-31
CP-2-32
CP-2-35

1,200
544.3
1,500
680.4
1,800
816.4
2,200
997.9
2,600 1,179.3
3,000 1,360.8

I
––
––
––
––
––
––
––
––
––

J
––
––
––
––
––
––
––
––
––

DEFL.
in.
mm
1.17
1.06
1.02
0.83
0.74
0.70

29.7
26.9
25.9
21.0
18.7
17.7

K
––
––
––
––
––
––
––
––
––

L
––
––
––
––
––
––
––
––
––

M
––
––
––
––
––
––
––
––
––

N
––
––
––
––
––
––
––
––
––

O
––
––
––
––
––
––
––
––
––

P
––
––
––
––
––
––
––
––
––

SPRING
COLOR
Purple
Orange
Green
Gray
White
Gold

ISOLATOR DETAILS

LD01089

FIG. 28 – CP-2-XX

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminium and Black Fin Condenser Coils
ALUMINUM FINS, SEISMIC ISOLATOR SELECTIONS - VMC MODEL # AWMR-X-XXX
YCAS
0130
0140
0150
0160
0170
0180
0200
0210
0230

A
-1-553
-1-553
-1-552
-1-552
-1-553
-1-553
-1-553
-1-553
-1-553

B
-1-551
-1-551
-1-552
-1-552
-1-552
-1-552
-1-552
-1-552
-1-552

C
-1-532
-1-532
-1-532
-1-532
-1-532
-1-532
-1-552
-1-552
-1-552

D
-1-530
-1-530
-1-531
-1-531
-1-531
-1-531
-1-551
-1-551
-1-551

E
-1-553
-1-553
-1-553
-1-553
-1-553
-1-553
-1-553
-1-553
-1-553

F
-1-551
-1-551
-1-552
-1-552
-1-552
-1-552
-1-552
-1-552
-1-552

G
-1-532
-1-532
-1-551
-1-551
-1-551
-1-551
-1-552
-1-552
-1-552

H
-1-530
-1-530
-1-532
-1-532
-1-532
-1-532
-1-551
-1-551
-1-551

I
––
––
––
––
––
––
––
––
––

ISOLATOR
TYPE & SIZE

MAX LOAD
lbs.
kg

AWMR-1-53
AWMR-1-530
AWMR-1-531
AWMR-1-532
AWMR-1-551
AWMR-1-552
AWMR-1-553
AWMR-2-520
AWMR-2-521
AWMR-2-53
AWMR-1-530
AWMR-2-531
AWMR-2-532

1,000
453.6
1,150
521.6
1,276
578.8
1,500
680.4
1,676
760.2
1,900
861.8
2,200
997.9
1,300
589.7
1,552
704.0
2,000
907.2
2,300 1,043.3
2,552 1,157.6
3,000 1,360.8

J
––
––
––
––
––
––
––
––
––

K
––
––
––
––
––
––
––
––
––

L
––
––
––
––
––
––
––
––
––

M
––
––
––
––
––
––
––
––
––

N
––
––
––
––
––
––
––
––
––

O
––
––
––
––
––
––
––
––
––

P
––
––
––
––
––
––
––
––
––

DEFL.
in.
mm
2
2
2
2
2
2
2
2
2
2
2
2
2

51
51
51
51
51
51
51
51
51
51
51
51
51

LD02973

AWMR-1-XXX

LD02974

AWMR-2-XXX

DIMENSIONS - In.
AWMR-1
50-553
AWMR-2
50-553

10-1/2

D
5/8
11NC
3/4
10NC

3/4

3-1/2

1-3/4

1/2

5/8

8-1/2

4-1/4

10-1/2

7-1/2

3-3/4

1/2

9-1/2

5/8

14-1/2

7-1/4

N/X
3/4
5/8
3/4
5/8

FIG. 29 – TYPE AWMR ISOLATOR DETAILS
YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminium and Black Fin Condenser Coils
ALUMINUM FINS, NEOPRENE MOUNT SELECTIONS – VMC TYPE RD-4
YCAS
0130
0140
0150
0160
0170
0180
0200
0210
0230

RED
RED
RED
RED
RED
RED
RED
RED
RED

BLACK
BLACK
BLACK
BLACK
BLACK
BLACK
RED
RED
RED

GRAY*
GRAY*
BLACK
BLACK
BLACK
BLACK
RED
RED
RED

RED
RED
RED
RED
RED
RED
RED
RED
RED

BLACK
BLACK
RED
RED
RED
RED
RED
RED
RED

GRAY*
GRAY*
BLACK
BLACK
BLACK
BLACK
RED
RED
RED

I
––
––
––
––
––
––
––
––
––

J
––
––
––
––
––
––
––
––
––

K
––
––
––
––
––
––
––
––
––

L
––
––
––
––
––
––
––
––
––

M
––
––
––
––
––
––
––
––
––

N
––
––
––
––
––
––
––
––
––

O
––
––
––
––
––
––
––
––
––

P
––
––
––
––
––
––
––
––
––

* VMC TYPE RD-3

NEW DESIGN FOR TYPE RD-4
NEOPRENE MOUNTINGS.

TYPE RD-3

29518A

TYPE R OR RD
NO BOLTING IS
PREFERRED–
Type R or RD mountings are
may be used without bolting
under machines having no
lateral or severe vertical
motion.

29517A

TYPE R OR RD
IF BOLTING IS PREFERRED–
Type R or RD mountings are
furnished with a tapped hole
in the center. This enables the
equipment to be bolted securely
to the mounting.

LD04033

TYPE
R-3
OR
RD-3
R-4
OR
RD-4

COLOR
CODE
BLACK
RED
GREEN
GRAY
BLACK
RED
GREEN
GRAY

MAX. LOAD
lbs.
250
525
750
1,100
1,500
2,250
3,000
4,000

(kg)
(113.5)
(238.3)
(340.5)
(499.4)
(681.0)
(1,021.5)
(1,362.0)
(1,816.0)

DEFLECTION
ins. (mm)
R
RD
0.25

0.50

(6.3)

(12.7)

0.25
(6.3)

0.50
(12.7)

LD04033

DIMENSIONS: ins. (mm)
TYPE
L
W
H
R-3
5-1/2" 3-3/8" 1-3/4"
OR
(139.7) (85.8) (44.4)
RD-3
R-4
6-1/4" 4-5/8" 1-5/8"
OR
(158.7)(117.6) (41.4)
RD-4

*HD

2-7/8" 2-1/2" 1/2" 4-1/8" 9/16" 1/4"
(73.2) (63.5) (12.7) (104.8) (14.4) (6.3)
2-3/4" 3"
1/2"
5" 9/16" 3/8"
(69.8) (76.2) (12.7) (127.0) (14.4) (9.6)

* HD dimension applies to double deflection Type RD mountings only.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils

LD09472

COPPER FIN CONDENSER COILS WEIGHT DISTRIBUTION BY MODEL (LBS)
YCAS

Total

0130

2,066

1,774

1,483

1,192

2,020

1,735

1,450

1,165

---

12,885

0140

2,072

1,779

1,487

1,194

2,043

1,754

1,465

1,177

---

12,971

0150

1,980

1,790

1,600

1,410

2,067

1,869

1,671

1,472

---

13,859

0160

2,003

1,819

1,635

1,451

2,064

1,875

1,685

1,495

---

14,028

0170

2,015

1,831

1,648

1,464

2,091

1,900

1,710

1,519

---

14,179

0180

2,019

1,836

1,652

1,468

2,103

1,911

1,720

1,529

---

14,238

0200

2,319

2,051

1,784

1,516

2,374

2,100

1,826

1,552

---

15,522

0210

2,334

2,066

1,798

1,530

2,397

2,122

1,847

1,571

---

15,665

0230

2,336

2,067

1,798

1,528

2,408

2,130

1,852

1,575

---

15,695

YCAS

Total

COPPER FIN CONDENSER COILS WEIGHT DISTRIBUTION BY MODEL (KGS)
0130

937

805

673

541

916

787

658

528

---

5,845

0140

940

807

674

542

927

796

665

534

---

5,884

0150

898

812

726

640

938

848

758

668

---

6,286

0160

909

825

742

658

936

850

764

678

---

6,363

0170

914

831

748

664

948

862

776

689

---

6,431

0180

916

833

749

667

954

867

780

694

---

6,458

0200

1,052

930

809

688

1,077

953

828

704

---

7,041

0210

1,059

937

816

694

1,087

963

838

713

---

7,106

0230

1,060

938

815

693

1,092

966

840

714

---

7,119

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils
60 HERTZ, COPPER FINS, 1” ISOLATOR SELECTIONS - VMC TYPE CP- (SEE TABLE BELOW)
YCAS

0130

2-31

2-28

2-27

2-31

2-28

2-27

---

0140

2-31

2-28

2-27

2-31

2-28

2-27

---

0150

2-31

2-28

2-31

---

0160

2-31

2-28

2-31

---

0170

2-31

2-28

2-31

---

0180

2-31

2-28

2-31

---

0200

2-32

2-31

2-28

2-32

2-31

2-28

---

0210

2-32

2-31

2-28

2-32

2-31

2-28

---

0230

2-32

2-31

2-28

2-32

2-31

2-28

---

ISOLATOR
TYPE & SIZE
CP-2-26
CP-2-27
CP-2-28
CP-2-31
CP-2-32
CP-2-35

MAX LOAD
lbs.
kg
1,200 544.3
1,500 680.4
1,800 816.4
2,200 997.9
2,600 1179.3
3,000 1360.8

DEFL.
in.
mm
1.17 29.7
1.06 26.9
1.02 25.9
0.83 21.0
0.74 18.7
0.70 17.7

SPRING
COLOR
Purple
Orange
Green
Gray
White
Gold

ISOLATOR DETAILS

LD01089

FIG. 30 – CP-2-XX

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils
60 HERTZ, CU. FINS, SEISMIC ISOLATOR SELECTIONS - VMC MODEL # AWMR-(SEE TABLE BELOW)
YCAS

0130

1-553

1-552

1-532

1-553

1-552

1-551

1-532

---

0140

1-553

1-552

1-532

1-553

1-552

1-551

1-532

---

0150

1-553

1-552

1-553

1-552

---

0160

1-553

1-552

1-553

1-552

---

0170

1-553

1-552

1-553

1-552

---

0180

1-553

1-552

1-553

1-552

---

0200

2-531

1-553

1-552

1-551

2-531

2-530

1-553

1-551

---

0210

2-531

1-553

1-552

1-551

2-531

2-530

1-553

1-551

---

0230

2-531

1-553

1-552

1-551

2-531

2-530

1-553

1-551

---

ISOLATOR
TYPE & SIZE

MAX LOAD
lbs.
kg

AWMR-1-53
AWMR-1-530
AWMR-1-531
AWMR-1-532
AWMR-1-551
AWMR-1-552
AWMR-1-553
AWMR-2-520
AWMR-2-521
AWMR-2-53
AWMR-1-530
AWMR-2-531
AWMR-2-532

1,000
453.6
1,150
521.6
1,276
578.8
1,500
680.4
1,676
760.2
1,900
861.8
2,200
997.9
1,300
589.7
1,552
704.0
2,000
907.2
2,300 1,043.3
2,552 1,157.6
3,000 1,360.8

DEFL.
in.
mm
2
2
2
2
2
2
2
2
2
2
2
2
2

51
51
51
51
51
51
51
51
51
51
51
51
51

LD02973

AWMR-1-XXX

LD02974

AWMR-2-XXX

DIMENSIONS - In.
AWMR-1
50-553
AWMR-2
50-553

10-1/2

D
5/8
11NC
3/4
10NC

3/4

3-1/2

1-3/4

1/2

5/8

8-1/2

4-1/4

10-1/2

7-1/2

3-3/4

1/2

9-1/2

5/8

14-1/2

7-1/4

N/X
3/4
5/8
3/4
5/8

FIG. 31 – TYPE AWMR ISOLATOR DETAILS
YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils
60 HERTZ, CU. FINS, NEOPRENE MOUNT SELECTION- VMC TYPE RD (SEE TABLE BELOW)
YCAS

0130

-4 Red

-4 Blk

-4 Red

-4 Blk

---

0140

-4 Red

-4 Blk

-4 Red

-4 Blk

---

0150

-4 Red

---

0160

-4 Red

---

0170

-4 Red

---

0180

-4 Red

---

0200

-4 Grn

-4 Red

-4 Grn

-4 Red

---

0210

-4 Grn

-4 Red

-4 Grn

-4 Red

---

0230

-4 Grn

-4 Red

-4 Grn

-4 Red

---

NEW DESIGN FOR TYPE RD-4
NEOPRENE MOUNTINGS.

TYPE RD-3

29518A

TYPE R OR RD
NO BOLTING IS PREFERRED–
Type R or RD mountings are may be
used without bolting under machines
having no lateral or severe vertical
motion.

LD04033

TYPE
R-3
OR
RD-3
R-4
OR
RD-4

COLOR
CODE
BLACK
RED
GREEN
GRAY
BLACK
RED
GREEN
GRAY

MAX. LOAD
lbs.
250
525
750
1,100
1,500
2,250
3,000
4,000

(kg)
(113.5)
(238.3)
(340.5)
(499.4)
(681.0)
(1021.5)
(1362.0)
(1816.0)

DEFLECTION
ins. (mm)
R
RD
0.25

0.50

(6.3)

(12.7)

0.25
(6.3)

0.50
(12.7)

29517A

TYPE R OR RD
IF BOLTING IS PREFERRED–
Type R or RD mountings are furnished with
a tapped hole in the center. This enables the
equipment to be bolted securely to the mounting.

LD04033

DIMENSIONS: ins. (mm)
TYPE
L
W
H
R-3
5-1/2" 3-3/8" 1-3/4"
OR
(139.7) (85.8) (44.4)
RD-3
R-4
6-1/4" 4-5/8" 1-5/8"
OR
(158.7)(117.6) (41.4)
RD-4

*HD

2-7/8" 2-1/2" 1/2" 4-1/8" 9/16" 1/4"
(73.2) (63.5) (12.7) (104.8) (14.4) (6.3)
2-3/4" 3"
1/2"
5" 9/16" 3/8"
(69.8) (76.2) (12.7) (127.0) (14.4) (9.6)

* HD dimension applies to double deflection Type RD mountings only.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminium Fin Condenser Coils
with Silencer Kit

LD09472

ALUMINUM FIN COIL WEIGHT DISTRIBUTION BY MODEL ( LBS )
YCAS

Total

0130

2,066

1,774

1,483

1,192

2,020

1,735

1,450

1,165

---

12,885

0140

2,072

1,779

1,487

1,194

2,043

1,754

1,465

1,177

---

12,971

0150

1,980

1,790

1,600

1,410

2,067

1,869

1,671

1,472

---

13,859

0160

2,003

1,819

1,635

1,451

2,064

1,875

1,685

1,495

---

14,028

0170

2,015

1,831

1,648

1,464

2,091

1,900

1,710

1,519

---

14,179

0180

2,019

1,836

1,652

1,468

2,103

1,911

1,720

1,529

---

14,238

0200

2,319

2,051

1,784

1,516

2,374

2,100

1,826

1,552

---

15,522

0210

2,334

2,066

1,798

1,530

2,397

2,122

1,847

1,571

---

15,665

0230

2,336

2,067

1,798

1,528

2,408

2,130

1,852

1,575

---

15,695

YCAS

Total

ALUMINUM FIN COIL WEIGHT DISTRIBUTION BY MODEL (KGS)
0130

937

805

673

541

916

787

658

528

---

5,845

0140

940

807

674

542

927

796

665

534

---

5,884

0150

898

812

726

640

938

848

758

668

---

6,286

0160

909

825

742

658

936

850

764

678

---

6,363

0170

914

831

748

664

948

862

776

689

---

6,431

0180

916

833

749

667

954

867

780

694

---

6,458

0200

1,052

930

809

688

1,077

953

828

704

---

7,041

0210

1,059

937

816

694

1,087

963

838

713

---

7,106

0230

1,060

938

815

693

1,092

966

840

714

---

7,119

YORK INTERNATIONAL

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminium Fin Condenser Coils
with Silencer Kit
60 HERTZ, ALUMINUM FINS, 1” ISOLATOR SELECTIONS - VMC TYPE CP- (SEE TABLE BELOW)
YCAS

0130

2-31

2-28

2-27

2-31

2-28

2-27

---

0140

2-31

2-28

2-27

2-31

2-28

2-27

---

0150

2-31

2-28

2-31

---

0160

2-31

2-28

2-31

---

0170

2-31

2-28

2-31

---

0180

2-31

2-28

2-31

---

0200

2-32

2-31

2-28

2-32

2-31

2-28

---

0210

2-32

2-31

2-28

2-32

2-31

2-28

---

0230

2-32

2-31

2-28

2-32

2-31

2-28

---

ISOLATOR
TYPE & SIZE
CP-2-26
CP-2-27
CP-2-28
CP-2-31
CP-2-32
CP-2-35

MAX LOAD
lbs.
kg
1,200
1,500
1,800
2,200
2,600
3,000

544.3
680.4
816.4
997.9
1179.3
1360.8

DEFL.
in.
mm
1.17
1.06
1.02
0.83
0.74
0.70

29.7
26.9
25.9
21.0
18.7
17.7

SPRING
COLOR
Purple
Orange
Green
Gray
White
Gold

ISOLATOR DETAILS

LD01089

FIG. 32 – CP-2-XX

100

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminium Fin Condenser Coils with Silencer Kit
60 HERTZ, ALUMINUM FINS, SEISMIC ISOLATOR SELECTIONS - VMC MODEL # AWMR-(SEE TABLE BELOW)
YCAS
A
0130 1-553
0140 1-553
0150 1-553
0160 1-553
0170 1-553
0180 1-553
0200 2-531
0210 2-531
0230 2-531

1-552

1-532

1-553

1-552

1-551

1-532

---

1-552
1-552
1-552
1-552
1-552
1-553
1-553
1-553

1-532
1-552
1-552
1-552
1-552
1-552
1-552
1-552

1-532
1-552
1-552
1-552
1-552
1-551
1-551
1-551

1-553
1-553
1-553
1-553
1-553
2-531
2-531
2-531

1-552
1-552
1-552
1-553
1-553
2-530
2-530
2-530

1-551
1-552
1-552
1-552
1-552
1-553
1-553
1-553

1-532
1-552
1-552
1-552
1-552
1-551
1-551
1-551

-----------------

MAX LOAD
lbs.
kg

ISOLATOR
TYPE & SIZE
AWMR-1-53
AWMR-1-530
AWMR-1-531
AWMR-1-532
AWMR-1-551
AWMR-1-552
AWMR-1-553
AWMR-2-520
AWMR-2-521
AWMR-2-53
AWMR-1-530
AWMR-2-531
AWMR-2-532

1,000
1,150
1,276
1,500
1,676
1,900
2,200
1,300
1,552
2,000
2,300
2,552
3,000

DEFL.
in.
mm

453.6
521.6
578.8
680.4
760.2
861.8
997.9
589.7
704.0
907.2
1043.3
1157.6
1360.8

2
2
2
2
2
2
2
2
2
2
2
2
2

51
51
51
51
51
51
51
51
51
51
51
51
51

LD02973

AWMR-1-XXX

LD02974

AWMR-2-XXX

DIMENSIONS - In.
AWMR-1
50-553
AWMR-2
50-553

10-1/2

D
5/8
11NC
3/4
10NC

3/4

3-1/2

1-3/4

1/2

5/8

8-1/2

4-1/4

10-1/2

7-1/2

3-3/4

1/2

9-1/2

5/8

14-1/2

7-1/4

N/X
3/4
5/8
3/4
5/8

FIG. 33 – TYPE AWMR ISOLATOR DETAILS
YORK INTERNATIONAL

101

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Aluminum Fin Condenser Coils
60 HERTZ, ALUMINUM FINS, NEOPRENE MOUNT SELECTION- VMC TYPE RD (SEE TABLE BELOW)
YCAS

0130

-4 Red

-4 Blk

-4 Red

-4 Blk

---

0140

-4 Red

-4 Blk

-4 Red

-4 Blk

---

0150

-4 Red

---

0160

-4 Red

---

0170

-4 Red

---

0180

-4 Red

---

0200

-4 Grn

-4 Red

-4 Grn

-4 Red

---

0210

-4 Grn

-4 Red

-4 Grn

-4 Red

---

0230

-4 Grn

-4 Red

-4 Grn

-4 Red

---

NEW DESIGN FOR TYPE RD-4
NEOPRENE MOUNTINGS.

TYPE RD-3

29518A

TYPE R OR RD
NO BOLTING IS PREFERRED–
Type R or RD mountings are may be
used without bolting under machines
having no lateral or severe vertical
motion.

LD04033

TYPE
R-3
OR
RD-3
R-4
OR
RD-4

102

COLOR
CODE
BLACK
RED
GREEN
GRAY
BLACK
RED
GREEN
GRAY

MAX. LOAD
lbs.
250
525
750
1,100
1,500
2,250
3,000
4,000

(kg)
(113.5)
(238.3)
(340.5)
(499.4)
(681.0)
(1021.5)
(1362.0)
(1816.0)

DEFLECTION
ins. (mm)
R
RD
0.25

0.50

(6.3)

(12.7)

0.25
(6.3)

0.50
(12.7)

29517A

TYPE R OR RD
IF BOLTING IS PREFERRED–
Type R or RD mountings are furnished with
a tapped hole in the center. This enables the
equipment to be bolted securely to the mounting.

LD04033

DIMENSIONS: ins. (mm)
TYPE
L
W
H
R-3
5-1/2" 3-3/8" 1-3/4"
OR
(139.7) (85.8) (44.4)
RD-3
R-4
6-1/4" 4-5/8" 1-5/8"
OR
(158.7)(117.6) (41.4)
RD-4

*HD

2-7/8" 2-1/2" 1/2" 4-1/8" 9/16" 1/4"
(73.2) (63.5) (12.7) (104.8) (14.4) (6.3)
2-3/4" 3"
1/2"
5" 9/16" 3/8"
(69.8) (76.2) (12.7) (127.0) (14.4) (9.6)

* HD dimension applies to double deflection Type RD mountings only.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils with Silencer Kit

LD09472

COPPER FIN CONDENSER COILS WITH SILENCER KIT WEIGHT DISTRIBUTION BY MODEL (LBS)
YCAS

Total

0130

2,131

1,916

1,701

1,486

2,089

1,878

1,667

1,457

---

14,325

0140

2,138

1,922

1,705

1,488

2,111

1,897

1,683

1,469

---

14,411

0150

2,050

1,933

1,817

1,700

2,131

2,010

1,889

1,768

---

15,299

0160

2,072

1,962

1,852

1,742

2,129

2,016

1,903

1,790

---

15,468

0170

2,085

1,975

1,865

1,755

2,156

2,042

1,929

1,815

---

15,621

0180

2,089

1,979

1,869

1,759

2,167

2,053

1,939

1,824

---

15,678

0200

2,406

2,225

2,044

1,864

2,458

2,273

2,088

1,904

---

17,262

0210

2,422

2,240

2,059

1,877

2,481

2,295

2,109

1,923

---

17,405

0230

2,424

2,241

2,059

1,876

2,491

2,303

2,115

1,927

---

17,435

YCAS

Total

0130

967

869

772

674

948

852

756

661

---

6,498

0140

970

872

773

675

958

860

763

667

---

6,537

0150

930

877

824

771

967

912

857

802

---

6,940

0160

940

890

840

790

966

914

863

812

---

7,016

0170

946

896

846

796

978

926

875

823

---

7,086

0180

948

898

848

798

983

931

880

827

---

7,111

0200

1,091

1,009

827

845

1,115

1,031

847

864

---

7,830

0210

1,099

1,016

934

851

1,125

1,041

857

872

---

7,895

0230

1,100

1,017

934

851

1,130

1,045

959

874

---

7,908

COPPER FIN CONDENSER COILS WITH SILENCER KIT WEIGHT DISTRIBUTION BY MODEL (KGS)

YORK INTERNATIONAL

103

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils with Silencer Kit
60 HERTZ, COPPER FINS WITH SILENCER KIT, 1” ISOLATOR SELECTIONS - VMC TYPE CP- (SEE TABLE BELOW)
YCAS

0130

2-31

2-28

2-31

2-28

---

0140

2-31

2-28

2-31

2-28

---

0150

2-31

---

0160

2-31

---

0170

2-31

---

0180

2-31

---

0200

2-35

2-32

2-31

2-28

2-35

2-32

2-31

---

0210

2-35

2-32

2-31

2-28

2-35

2-32

2-31

---

0230

2-35

2-32

2-31

2-28

2-35

2-32

2-31

---

ISOLATOR
TYPE & SIZE
CP-2-26
CP-2-27
CP-2-28
CP-2-31
CP-2-32
CP-2-35

MAX LOAD
lbs.
kg
1,200 544.3
1,500 680.4
1,800 816.4
2,200 997.9
2,600 1179.3
3,000 1360.8

DEFL.
in.
mm
1.17 29.7
1.06 26.9
1.02 25.9
0.83 21.0
0.74 18.7
0.70 17.7

SPRING
COLOR
Purple
Orange
Green
Gray
White
Gold

ISOLATOR DETAILS

LD01089

FIG. 34 – CP-2-XX

104

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils with Silencer Kit
60 HERTZ, CU. FINS, SEISMIC ISOLATOR SELECTIONS - VMC MODEL # AWMR-(SEE TABLE BELOW)
YCAS

0130

1-553

1-552

1-553

1-552

1-531

---

0140

1-553

1-552

1-553

1-552

1-531

---

0150

1-553

---

0160

1-553

---

0170

1-553

---

0180

1-553

---

0200

2-532

2-553

1-553

1-551

2-532

2-531

1-553

2-53

---

0210

2-532

2-553

1-553

1-551

2-532

2-531

1-553

2-53

---

0230

2-532

2-553

1-553

1-551

2-532

2-531

1-553

2-53

---

MAX LOAD
lbs.
kg

ISOLATOR
TYPE & SIZE
AWMR-1-53
AWMR-1-530
AWMR-1-531
AWMR-1-532
AWMR-1-551
AWMR-1-552
AWMR-1-553
AWMR-2-520
AWMR-2-521
AWMR-2-53
AWMR-1-530
AWMR-2-531
AWMR-2-532

1,000
1,150
1,276
1,500
1,676
1,900
2,200
1,300
1,552
2,000
2,300
2,552
3,000

DEFL.
in.
mm

453.6
521.6
578.8
680.4
760.2
861.8
997.9
589.7
704.0
907.2
1043.3
1157.6
1360.8

2
2
2
2
2
2
2
2
2
2
2
2
2

51
51
51
51
51
51
51
51
51
51
51
51
51

LD02973

AWMR-1-XXX

LD02974

AWMR-2-XXX

DIMENSIONS - In.
AWMR-1
50-553
AWMR-2
50-553

10-1/2

D
5/8
11NC
3/4
10NC

3/4

3-1/2

1-3/4

1/2

5/8

8-1/2

4-1/4

10-1/2

7-1/2

3-3/4

1/2

9-1/2

5/8

14-1/2

7-1/4

N/X
3/4
5/8
3/4
5/8

FIG. 35 – TYPE AWMR ISOLATOR DETAILS
YORK INTERNATIONAL

105

Technical Data

FORM 201.19-NM1 (204)

WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
Copper Fin Condenser Coils with Silencer Kit
60 HERTZ, CU. FINS, NEOPRENE MOUNT SELECTION- VMC TYPE RD (SEE TABLE BELOW)
YCAS

0130

-4 Red

---

0140

-4 Red

---

0150

-4 Red

---

0160

-4 Red

---

0170

-4 Red

---

0180

-4 Red

---

0200

-4 Grn

-4 Red

-4 Grn

-4 Red

---

0210

-4 Grn

-4 Red

-4 Grn

-4 Red

---

0230

-4 Grn

-4 Red

-4 Grn

-4 Red

---

NEW DESIGN FOR TYPE RD-4
NEOPRENE MOUNTINGS.

TYPE RD-3

29518A

TYPE R OR RD
NO BOLTING IS PREFERRED–
Type R or RD mountings are may be
used without bolting under machines
having no lateral or severe vertical
motion.

LD04033

TYPE
R-3
OR
RD-3
R-4
OR
RD-4

106

COLOR
CODE
BLACK
RED
GREEN
GRAY
BLACK
RED
GREEN
GRAY

MAX. LOAD
lbs.
250
525
750
1,100
1,500
2,250
3,000
4,000

(kg)
(113.5)
(238.3)
(340.5)
(499.4)
(681.0)
(1021.5)
(1362.0)
(1816.0)

DEFLECTION
ins. (mm)
R
RD
0.25

0.50

(6.3)

(12.7)

0.25
(6.3)

0.50
(12.7)

29517A

TYPE R OR RD
IF BOLTING IS PREFERRED–
Type R or RD mountings are furnished with
a tapped hole in the center. This enables the
equipment to be bolted securely to the mounting.

LD04033

DIMENSIONS: ins. (mm)
TYPE
L
W
H
R-3
5-1/2" 3-3/8" 1-3/4"
OR
(139.7) (85.8) (44.4)
RD-3
R-4
6-1/4" 4-5/8" 1-5/8"
OR
(158.7)(117.6) (41.4)
RD-4

*HD

2-7/8" 2-1/2" 1/2" 4-1/8" 9/16" 1/4"
(73.2) (63.5) (12.7) (104.8) (14.4) (6.3)
2-3/4" 3"
1/2"
5" 9/16" 3/8"
(69.8) (76.2) (12.7) (127.0) (14.4) (9.6)

* HD dimension applies to double deflection Type RD mountings only.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

INSTALLATION INSTRUCTIONS FOR
VMC SERIES AWR/AWMR AND CP
RESTRAINED MOUNTINGS
1.
2.

3.
4.

Floor should be level and smooth.
For indoor applications, isolators do not normally
require bolting. If necessary, anchor isolators to
floor through bolt holes in base plate.
IM PORTANT: Iso la tors must be bolted to
substructure and equipment to isolators when
used under outdoor equipment exposed to wind
forces.
Lubricate threads of adjusting bolt. Loosen hold
down bolts to allow for isolator adjustment.
Block the equipment 1/4" higher than the specified free height of the isolator. To use the isolator
as blocking for the equipment, insert a 1/4" shim
between the upper load plate and vertical uprights.
Lower the equipment on the blocking or shimmed
isolators.
Complete piping and fill equipment with water,
refrigerant, etc.

Turn leveling bolt of first isolator four full revolutions and proceed to each mount in turn.
7. Continue turning leveling bolts until equipment is
fully supported by all mountings and equipment is
raised free of the spacer blocks or shims. Remove
blocks or shims.
8. Turn leveling bolt of all mountings in either direction in order to level the installation.
9. Tighten nuts on hold down bolts to permit a clearance of 1/8" between resilient washer and underside
of channel cap plate.
10. Installation is now complete.

YORK INTERNATIONAL

107

Technical Data

FORM 201.19-NM1 (204)

REFRIGERANT FLOW DIAGRAM
OC
CDR

COMP.

CLR
RC2

Low Pressure Liquid

Low Pressure Vapour

High Pressure Vapour

Medium Pressure Vapour

High Pressure Liquid

Oil

COMP - Compressor
CDR -Condenser Coil
OC - Oil Cooler
OS - Oil Separator
m 3/s - Air Entering Compressor R-22 - Refrigerant Circuit Number

CLR - Cooler

EC - Economizer (Added to some models)

Thermostatic
Electronic Expansion Valve

Angle Stop Valve

Solenoid Valve

Sight Glass

TXV Valve

Filter or Drier

Relief Valves
LD09428

FIG. 36 – REFRIGERANT FLOW DIAGRAM

Low pressure liquid refrigerant enters the evaporator and
is evaporated and superheated by the heat energy absorbed
from the chilled water passing through the evaporator
shell. Low pressure vapor enters the compressor where
pressure and superheat are increased. High pressure vapor
is passed through the oil separator where compressor oil
is removed and recirculated to the compressor via the
condenser. The high pressure oil-free vapor is fed to the
air cooled condenser coil where the heat is removed. On
economized models, the fully condensed liquid enters
the economizer.
108

A small percentage of the of the liquid passes through an
expansion valve, into the other side of the economizer
where it is evaporated. This low pressure liquid subcools
the major part of the refrigerant. Medium pressure vapor
then returns to the compressor. The subcooled refrigerant
then passes through the expansion valve where pressure
is reduced and further cooling takes place before returning to the evaporator.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

PROCESS AND INSTRUMENTATION DIAGRAM

SYSTEM COMPONENTS
OC

EXPANSION VALVE,ELECTRONIC
THERMOSTATIC

CDR

AIR
FLOW

DV
HTC
LTC

SOLENOID VALVE
BALL VALVE

DV
DIF

RELIEF VALVE
STOP VALVE ANGLE, ACCESS

DV
HTC
P

PURGE VALVE
PLUG

DV
LPC

COMP

PRESSURE SENSOR

TEMPERATURE SENSOR
REPLACEABLE CORE FILTER DRYER

T
P

SIGHT GLASS

HTR

SHV

DV
HTC

FLOW SWITCH (option)

PRESSURE SWITCH

HTR

ELECTRIC HEATER

HTR

CLR

T
CHILLED WATER
FLOW

DV
HPC
HPL
DPF

DV
CHT
LTC

MAJOR COMPONENTS

MICROPROCESSOR CONTROL FUNCTIONS

COMP

COMPRESSOR

CHT

CHILLED LIQUID THERMOSTAT

CDR

CONDENSER COIL

DIF

DIFFERENTIAL PRESSURE CUTOUT

CLR

COOLER

DFP

DISCHARGE PRESSURE FAN CONTROL

OIL COOLER COIL

DISPLAY VALUE

OIL SEPARATOR

HPL

HIGH PRESSURE LOAD LIMITING

HTC

HIGH TEMPERATURE CUTOUT

LPC

LOW PRESSURE CUTOUT

LTC

LOW TEMPERATURE CUTOUT

SHV

SUPERHEAT VALVE

LD09429

FIG. 37 – PROCESS AND INSTRUMENTATION DIAGRAM
YORK INTERNATIONAL

109

Technical Data

FORM 201.19-NM1 (204)

COMPONENT LOCATIONS
Control Panel
BAMB
1-BOT
1-BDP
1-BOT
1-BOP

1-BDP

1-ZCPR

1-SHPI

1-CCCV
1-ECH

1-XCMTB

BCLT

1-STS

EEH1

1-BSP

2-YELSSV

2-BOT

3-BDT
3-BOP

3-SHPI

3-ZCPR

EEH1

BCRT

3-BDP

3-CCCV
3-ECH

3-XCMTB

2-RFTS

1-RFTS

2-YELSSV

2-STS

3-BSP

1-YELSSV

- BAMB
- BCLT
- BCRT
- BDP
- BDT
- BOP
- BOT
- BSP
- CCCV
- ECH
- EEH
- SHPI
- STS
- RFTS
- XCMTB
- YELSSV
- ZCPR

AMBIENT
COLD LEAVING TEMPERATURE
COLD RETURN TEMPERATURE
DISCHARGE PRESSURE
DISCHARGE TEMPERATURE
OIL PRESSURE
OIL TEMPERATURE
SUCTION PRESSURE
COMPRESSOR CAPACITY CONTROL VALVE
CRANK CASE HEATER
EVAPORATOR HEATER
HIGH PRESSURE CUT-OUT
SUCTION TEMPERATURE SENSOR
REFRIGERANT FEED TEMPERATURE SENSOR (R407C only)
COMPRESSOR MOTOR TERMINAL BOX
ECONOMIZER LIQUID SUPPLY SOLENOID VALVE
COMPRESSOR

LD07012

FIG. 38 – COMPONENT LOCATIONS
110

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

COMPRESSOR COMPONENTS

LIFTING LUG
THREADED HOLE
SUCTION GAS IN

MOTOR TERMINALS
OIL PRESSURE
TRANSDUCER
LOCATION
CAPACITY CONTROL SOLENOID
(CAPACITY CONTROL, 3 WAY VALVE,
IS LOCATED UNDER THE SOLENOID)
ROTOR CASE

STATOR
LOCKING BOLT

OIL FILTER
COVER PLATE

OIL FILTER
BLEED &
EVACUATION
POINT

LIFTING LUG
THREADED
HOLE
OIL
HEATER
ECONOMIZER
GAS IN

EVACUATION
PORT

DISCHARGE
CASE
OIL INLET
FROM
CONDENSER
COOLING COIL

DISCHARGE GAS OUT

7
LD03668

FIG. 39 – COMPRESSOR COMPONENTS
YORK INTERNATIONAL

111

Technical Data

FORM 201.19-NM1 (204)

COMPRESSOR COMPONENTS – CONT’D

LD03669

FIG. 40 – COMPRESSOR COMPONENTS

112

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

COMPRESSOR COMPONENTS – CONT’D

LD03670

FIG. 41 – COMPRESSOR COMPONENTS

YORK INTERNATIONAL

113

Technical Data

FORM 201.19-NM1 (204)

COMPRESSOR COMPONENTS – CONT’D

OIL FILTER

O-RING

MALE ROTOR

DISCHARGE
CHECK VALVE

RELIEF VALVE

LD06079

FIG. 42 – COMPRESSOR COMPONENTS

114

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

PART NAME
O-RING
SUCTION COVER
SUCTION STRAINER
ROTOR SCREW
ROTOR LOCK WASHER
ROTOR CLAMP WASHER
ROTOR
STATOR
MALE INLET BEARING
MALE ROTOR RETAINING RING
MALE ROTOR
ROTOR CASE
O-RING
DOWEL PIN
DISCHARGE CASE
LIP SEAL
DISCHARGE RADIAL BEARING
SPACER SHIM
THRUST BEARINGS
THRUST SPACE SHIM
REVERSE THRUST BEARING
BEARING CLAMP NUT
BEARING SPACER SLEEVE
BEARING PRELOAD SPRING
O-RING
BEARING BORE PLUG
DISCHARGE COVER
BEARING BORE PLUG
BEARING PRELOAD SPRING
BEARING SPACER SLEEVE
BEARING CLAMP NUT
REVERSE THRUST BEARING
THRUST SPACER SHIM
THRUST BEARINGS
SPACER SHIM
DISCHARGE RADIAL BEARING
LIP SEAL
DOWEL PIN
SUPPORT RING
ECONOMIZER PLUG
SUPPORT RING
FEMALE ROTOR RETAINING RING
FEMALE INLET BEARING

15 16 17 18

35 34 33 32 31

21 22 23 24

COMPRESSOR COMPONENTS – CONT’D

LD03673

FIG. 43 – COMPRESSOR COMPONENTS
YORK INTERNATIONAL

115

Technical Data

FORM 201.19-NM1 (204)

COMPRESSOR COMPONENTS – CONT’D

MOTOR ROTOR /
MALE ROTOR LOCKING KEY

O-RING
MALE ROTOR

RELIEF
VALVE

SUPPORT ECONOMIZER
PLUG
RINGS

SLIDE VALVE
RETURN
SPRING

O-RING

FEMALE ROTOR

SLIDE VALVE

LD03672

FIG. 44 – COMPRESSOR COMPONENTS

116

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

SYSTEM STARTUP CHECKLIST
JOB NAME: ______________________________
SALES ORDER #: _________________________
LOCATION: _______________________________
SOLD BY: ________________________________
INSTALLING
CONTRACTOR: ___________________________
START-UP
TECHNICIAN/
COMPANY: _______________________________
START-UP DATE : _________________________
CHILLER MODEL #: _______________________
SERIAL #: ________________________________
COMPRESSOR #1
MODEL#: ________________________________
SERIAL #: ________________________________
COMPRESSOR #2
MODEL#: ________________________________
SERIAL #: ________________________________
UNIT CHECKS (NO POWER)

Check the system 24 hours prior to initial start.
1. Inspect the unit for shipping or installation
damage.
2. Assure that all piping has been completed.
3. Check that the unit is properly charged and that
there are no piping leaks.
4. Open each compressor suction service valve,
discharge service valve, economizer service
valve, liquid line stop valve, and oil line ball
valves.
5. The compressor oil level should be maintained
so that an oil level is visible in either of the two
oil separator sight glasses. In other words, oil
level should always be maintained, running or
not, above the bottom of the lower sight glass
and below the top of the upper sight glass.
If it is necessary to add oil, connect a YORK oil
pump to the charging valve on the oil separator,
but do not tighten the flare nut on the delivery
tubing. With the bottom (suction end) of the
pump submerged in oil to avoid entrance of air,
YORK INTERNATIONAL

operate the pump until oil drips from the flare nut
joint, allowing the air to be expelled, and tighten
the flare nut. Open the oil charging valve on the
oil separator and pump in oil until it reaches the
proper level as described above.

In actual operation, due to splashing,
an oil level may be seen in both sight
glasses. Run the compressor for a few
minutes fully loaded, shut the system
down, and assure there is an oil level
showing in the bottom or top sight
glass with the compressor off.
6. Assure water pumps are on. Check and adjust
water pump flow rate and pressure drop across
the evaporator.

Excessive flow may cause catastrophic
damage to the evaporator.

7. Check the control panel to assure it is free of
foreign material (wires, metal chips, etc.).
8. Visually inspect wiring (power and control).
Wiring MUST meet N.E.C. and local codes.
See Fig. 9 and 10, pages 36 and 37.
9. Check tightness of power wiring inside the power
panel on both sides of the motor contactors and
inside the motor terminal boxes.
10. Check for proper size fuses in main and control
circuits.
11.Verify that field wiring matches the 3-phase
power requirements of the compressor. See
chiller nameplate (Pages 25 - 26).
12.Assure 115VAC Control Power has 30A minimum capacity. See Fig. 14, page 41.
13.Be certain all water temp sensors are inserted
completely in their respective wells and are
coated with heat conductive compound.
14.Assure that evaporator EEV bulbs are strapped
onto the suction lines at 4 or 8 o’clock positions.
15.Assure that the 15 ton economizer TXV bulbs
are strapped onto the compressor economizer
supply lines at 4 or 8 o’clock positions.
117

Technical Data

FORM 201.19-NM1 (204)

16.Assure that the Flow Switch is properly installed, wired correctly, and working.
17. Assure bolts through compressor feet to bottom
frame rails are removed.
PANEL CHECKS

5. Program the required operating values into the
micro for cut-outs, safeties, etc. and record them
in the chart below. See Page 166 for details.
Record programmed values in the chart below.
PROGRAMMED VALUES

(Power ON – Both System Switches “OFF”)
Display Language = _________________________

1. Apply 3-phase power and verify its value (See
Fig. 9 and 10 pages 36 and 37).
2. Apply 115VAC and verify its value on the terminal block in the lower left of the Power Panel.
Make the measurement between terminals 5 and
2 (See Fig. 14, page 41). The voltage should be
115VAC +/- 10%.
3. Assure the heaters on each compressor are on.
Allow the compressor heaters to remain on a
minimum of 24 hours before start-up. This is
important to assure that no refrigerant is in
the compressor oil at start-up!
4. Program the dip switches on the microprocessor
board for the desired operating requirements. See
Fig. 49, Page 147. OPEN = Left side of switch
pushed down. CLOSED = Right side of switch
pushed down.
SWITCH

SWITCH "OPEN"
SETTING

SWITCH "CLOSED"
SETTING

Water Cooling

Glycol Cooling

Standard Ambient
Control

Low Ambient Control

Refrigerant R-407C

Refrigerant R-22

Do Not Use

YCAS

Do Not Use

Motor Current
Averaging (Start-Up)
Disabled

Heat Recovery
Disabled

Do Not Use

Expansion Valve
Thermostatic

Expansion Valve
Electronic*

Standard Options
Do Not Use
Enabled
*Expansion valve electronic should always be selected when an
EEV is installed.
8

Verify the selections by pressing the OPTIONS Key on
the control panel. Check them off in the chart above.

Damage to the chiller could result
if switch es are im prop er ly programmed.

Discharge Press Cutout = ___________PSIG (kPa)
Discharge Press Unload = ___________PSIG (kPa)
Suction Press Cutout = _____________PSIG (kPa)
High Amb Cutout = ___________________ °F (°C)
Low Amb Cutout = ____________________ °F (°C)
Leaving Chilled Liquid Temp Cutout = _____ °F (°C)
High Motor Current Unload = ____________ % FLA
Anti-Recycle Time = ____________________Secs
Local / Remote Mode = ______________________
Display Units =

_________________________

Lead / Lag Control = ________________________
Power Failure Restart = _____________________
Suction Superheat Setpoint = __________ °F (°C)

6. Program the Chilled Liquid Setpoint/Range and
record:
Setpoint = __________________ °F (°C)
Range = +/- ________________ °F (°C)

Keep in mind that the setpoint temperature displayed by the micro should equal the desired
leaving water temperature.
7. Assure that the CLK jumper J18 on the Microprocessor Board is in the ON position (Top 2
pins).
8. Set the Time and Date.
9. Program the Daily Schedule start and stop
times.
10.Check the Factory Service Mode programming
values, (See Section 8.9) assure they are correct,
and record the values below:
Refrigerant Type = __________________________
R407C Chiller Type = ________________________
Unit Type = _______________________________

118

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Heat Recovery = ___________________________
Sys #1 100% FLA = ____________________ Amps
Sys #2 100% FLA = ____________________ Amps
Sys #1 Motor Protector Input = ____________ Volts
Sys #2 Motor Protector Input = ____________ Volts

Typically, these values should not be
changed. Incorrect programming may
cause catastrophic chiller failure.

11.Check the Motor Protector Dip Switch programming. The switches should correctly set at the
factory. The switches may be checked visibly
and the total ON switches added using binary
addition to determine the setting or by reading
the display on the motor protector. See Section
8 for programming information. Record the
values below:
Sys #1 Wires thru each hole of the C.T. = ________
Sys #1 MP Setting =

________

Sys #2 Wires thru each hole of the C.T. = ________
Sys #2 MP Setting =

________

INITIAL START-UP

After the control panel has been programmed and the
compressor heater has been on for 24 hours prior to
start-up, the chiller may be placed into operation.
1. Place the System Switches on the Microprocessor Board to the ON position.
2. The compressor will start and a flow of refrigerant will be noted in the sight glass. After
several minutes of operation, the bubbles in the
sight glass will disappear and there will be a
solid column of liquid when the TXV stabilizes.
After the water temperature stabilizes at desired
operating conditions, the sight glass should be
clear.
3. Allow the compressor to run a short time, being
ready to stop it immediately if any unusual noise
or adverse conditions develop. Immediately at
start-up, the compressor will make sounds different from its normal high pitched sound. This
is due to the compressor coming up to speed and
lubrication changing from liquid refrigerant to
oil. This should be of no concern and lasts for
only a short time.
YORK INTERNATIONAL

4. Check the system operating parameters. Do this
by selecting various displays such as pressures
and temperatures. Compare these to test gauge
readings.
CHECKING SUBCOOLING AND SUPERHEAT

The subcooling should always be checked when charging the system with refrigerant and/or before setting
the superheat.
When the refrigerant charge is correct, there will be no
bubbles in the liquid sight glass with the system operating under full load conditions, and there will be 12 15°F (6 - 8°C) subcooled liquid leaving the condenser.
An overcharged system should be guarded against.
Evidences of overcharge are as follows:
a. If a system is overcharged, the discharge pressure will
be higher than normal. (Normal discharge/condensing
pressure can be found in the refrigerant temperature/
pressure chart; use entering air temperature +30°F
(17°C) for normal condensing temperature.
b. The temperature of the liquid refrigerant out of the
condenser should be not be more than 15°F (8°C)
less than the condensing temperature (The temperature corresponding to the condensing pressure
from the refrigerant temperature/pressure chart).
The subcooling temperature of each system should be
calculated by recording the temperature of the liquid
line at the outlet of the condenser and subtracting it
from the recorded liquid line pressure at the liquid stop
valve, converted to temperature from the temperature/
pressure chart.
Example:
Liquid line pressure =
202 PSIG converted to

102°F (39°C)

minus liquid line temp.

- 87°F (31°C)

SUBCOOLING =

15°F

(8.3°C)

The subcooling should be adjusted to 12-15°F (6.7/- 8.3°C).

1. Record the liquid line pressure and its corresponding temperature, liquid line temperature
and subcooling below:
SYS 1
Liq Line Press =
Temp =

SYS 2
PSIG (kPa)
°F
(°C)

Liq Line Temp =

°F

(°C)

Subcooling =

°F

(°C)

119

Technical Data

FORM 201.19-NM1 (204)

If equipped with an economizer, the
economizer will provide approximately an additional 20ºF (11.1ºC)
subcooling at the expansion valve in
ambients above 90ºF (32ºC). Below
90ºF (32ºC), the economizer will not
provide additional subcooling.
After the subcooling is set, the suction superheat should
be checked. The superheat should be checked only after
steady state operation of the chiller has been established,
the leaving water temperature has been pulled down to
the required leaving water temperature, and the unit is
running in a fully loaded condition. Correct superheat
setting for a system is 10 - 12°F (6 - 7°C).
The superheat is calculated as the difference between
the actual temperature of the returned refrigerant gas in
the suction line entering the compressor and the temperature corresponding to the suction pressure as shown
in a standard pressure/temperature chart.
Example:
Suction Temp =

46°F

(8°C)

minus Suction Press
60 PSIG converted
to Temp

- 34°F (1°C)
12°F

(7°C)

The EEV is non-adjustable. Superheat setpoint is programmable from
the keypad.

2. Record the suction temperature, suction pressure,
suction pressure converted to temperature, and
superheat of each system below:

The superheat is calculated as the difference between
the pressure at the Economizer Service Valve on the
compressor converted to the corresponding temperature
in a standard pressure/temperature chart and temperature
of the gas at the bulb on the entering piping to the motor housing.
Example:
Motor Gas Temp =
minus Economizer Press
139 PSIG converted
to Temp

90°F

(32°C)

- 78°F (26°C)
12°F (6°C)

Normally, the thermal expansion valve need not be
adjusted in the field. If however, adjustment needs to
be made, the expansion valve adjusting screw should
be turned not more than one turn at a time, allowing
sufficient time (approximately 15 minutes) between
adjustments for the system and the thermal expansion
valve to respond and settle out. Assure that superheat is
set between 10 - 12°F (6 - 7°C).

SYS 1
Economizer Press =
Economizer Temp =

SYS 2
PSIG (kPa)
°F
(°C)

Economizer Press
Converted to Temp =

°F

(°C)

Superheat =

°F

(°C)

This superheat should only be checked
in an ambient above 90°F (32°C). Otherwise, mid-range adjustment (factory
setting) is acceptable. Below 90ºF
(32ºC) ambient, the economizer will
not provide additional subcooling.
LEAK CHECKING

SYS 2

Suction Press =

PSIG

Suction Temp =

°F

(°C)

Suction Press
Converted
to Temp =
Superheat =

°F
°F

(°C)
(°C)

120

The economizer superheat should be checked to assure
proper economizer operation and motor cooling. Correct
superheat setting is approx. 10 - 12°F (6 - 7°C).

1. Record the motor gas temperature, economizer
pressure, economizer pressure converted to
temperature, and economizer superheat below:

The suction temperature should be taken 6" (13 mm)
before the compressor suction service valve, and the
suction pressure is taken at the compressor suction
service valve.

SYS 1

CHECKING ECONOMIZER SUPERHEAT
(IF APPLICABLE) (15 TON TXV)

(kPa)

1. Leak check compressors, fittings, and piping to
assure no leaks.
If the unit is functioning satisfactorily during the initial
operating period, no safeties trip and the compressors
load and unload to control water temperature, the chiller
is ready to be placed into operation.
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FORM 201.19-NM1 (204)

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121

Micro Panel Contents

FORM 201.19-NM1 (204)

CHILLER CONTROL PANEL
PROGRAMMING AND DATA ACCESS KEYS

STATUS

DISPLAY
SETPOINTS

CLOCK

DISPLAY
INFORMATION KEYS

29023A

ON / OFF

DISPLAY AND STATUS INFORMATION KEYS

Status Key - see Section 2
This key provides a display of the current operational
and/or fault status of the chiller or individual refrigerant
systems.
Display Keys - see Section 3
Each key provides a real time display of commonly
required information about the chiller and individual
system operating conditions and settings.
Print Keys - see Section 4
These keys allow control panel display or remote
printout of both current real-time operating and programmed data as well as fault history data from recent
safety shutdowns.
ON / OFF ROCKER SWITCH

This switch shuts down the entire chiller when placed
in the OFF position. The switch must be ON for the
chiller to operate.

PROGRAM &
SETUP KEY

PROGRAM & SETUP KEYS

Entry Keys - see Section 5
The numeric and associated keys are used for entering
data required for programming the chiller. The ENTER
and
keys are also used for scrolling through information available after pressing certain keys.
Setpoints Keys - see Section 6
These keys are used for display and programming of
the local and remote offset chilled liquid temperature
setpoints.
Clock Keys - see Section 7
These keys are used for display and programming of the
clock and operating schedule for the chiller.
Program Key - see Section 8
This key is used for display and programming of the
chiller operational settings and limits.

The systems will not pump down at shutdown when the
UNIT switch is switched off.
122

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FORM 201.19-NM1 (204)

1. INTRODUCTION & PHYSICAL DESCRIPTION

29023A

1.1 GENERAL

The YORK Screw Chiller Control Panel is a microprocessor based control system fitted to YCAS liquid chillers. It is capable of multi-refrigerant system control to
maintain chilled liquid temperature within programmed
limits and to provide safety control of the chiller. The
microprocessor monitors leaving chilled liquid temperature deviation from setpoint and the rate of change of this
temperature to start, stop, load and unload compressors
as required.
User interface is via a touch keypad and a liquid crystal
display allowing access to operating and programmed
data. Information can be displayed in English (Imperial)
units or SI (Metric) units (Section 8.1). Conversion
tables are provided at the back of this manual.

provided for remote cycling, current limiting, remote
temperature setpoint reset and alarm annunciation.
YCAS chillers each have a single split circuit evaporator serving 2 independent refrigerant systems. YCAS 2
system chillers are configured as a single self contained
section with a single control panel controlling the two
refrigerant systems.
1.2 KEYPAD & DISPLAY

An operator keypad allows complete control of the
chiller from a central location. The keypad offers a
multitude of commands available to access displays,
program setpoints, and initiate system commands.
Keys are grouped and color coded for clarity and ease
of use.

A master ON/OFF rocker switch is provided on the
chiller control panel to activate or deactivate the complete chiller, while switches to activate or deactivate
individual refrigerant systems are provided on the Microprocessor Board.

A 40 Character Liquid Crystal Display (2 lines of 20
characters) is used for displaying system parameters
and operator messages. The display has a lighted background for night viewing as well as a special feature
which intensifies the display for viewing in direct
sunlight.

External interface is available for control of the chiller
via a YORK ISN System or YORK Remote Control
Center. In addition, EMS/BAS System connections are

Displays will be updated every two seconds by the
microprocessor.

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1.3 UNIT (CHILLER) ON / OFF SWITCH

A master UNIT (Chiller) ON / OFF switch is located
just below the keypad. This switch allows the operator
to turn the entire chiller OFF, if desired. The switch must
be placed in the ON position for the chiller to operate.
Any time the switch is in the OFF position, a Status
message indication will be displayed. See page 122 for
the location of this switch.
1.4 MICROPROCESSOR BOARD

The Microprocessor Board controls and makes decisions
for the chiller. Information inputs from transducers and
sensors around the chiller are either connected directly
to the Microprocessor Board or are connected to the I/O
Expansion Board and multiplexed before being sent to
the Microprocessor Board. The Microprocessor Board
circuitry multiplexes all of these analog inputs, digitizes
them, and constantly scans them to monitor chiller
operating conditions. Based on this information, the
Microprocessor issues commands to the Relay Boards
to activate and deactivate contactors, solenoids, etc. for
chilled liquid, operating control, and safety control.
Commands are sent from the Microprocessor Board to
the I/O Expansion Board to control the slide valves for
chilled liquid control.
Keypad commands are acted upon by the micro to change
setpoints, cutouts, scheduling, operating requirements,
and to provide displays.
A +12VDC REG supply voltage from the Power Supply
Board is converted to +5V REG by a voltage regulator
located on the Microprocessor Board. This voltage is
used to operate the integrated circuitry on the board.
System Switches 1 - 4
System Switches for each system are located on the
Microprocessor Board (Section 1.11, Item 5). These
switches allow the operator to selectively turn a given
system on or off as desired.
Internal Clock & Memory Backup Battery
The Microprocessor Board contains a Real Time Clock
integrated circuit chip (Section 1.11, Item 2) with an
internal battery backup. The battery backup assures that
any programmed values (setpoints, clock, cutouts, etc.)
are not lost during a power failure or shutdown period
regardless of the time involved.
The battery is a 10 year lithium type, but life will depend
upon whether the Real Time Clock’s internal clock
124

FORM 201.19-NM1 (204)

circuit is energized. With the clock OFF, a rated life of
approximately 10 years can be expected. With the clock
ON, approximately 5 years. The clock is enabled and
disabled using a jumper on the microprocessor board.
If the chiller is shut down or power failure is expected for
extended periods, it may be desirable to disable the clock
to save battery life. The clock can then be reactivated and
reprogrammed when the chiller is returned to service.
This will not affect the maintenance of programmed
values and stored data by the backup battery.
While a chiller is operating, the clock must be ON
(Section 1.11, Item 1) or the internal clock on the
mi cro pro ces sor will not be active and the micro
cannot keep track of time, although all other functions
will operate normally. Failure to turn the Clock ON
could result in the chiller not starting due to the time
"frozen" on the clock falling outside the Start/Stop time
programmed in the Daily Schedule, see Section 7.3.
1.5 ANCILLARY CIRCUIT BOARDS

Power Supply Board
The on-board switching power supply is fuse protected
and converts 24VAC from the logic transformer 2T to
+12V REG which is supplied to the Microprocessor
Board, Relay Output Boards, and the 40 character
display to operate the integrated circuitry.
24VAC is filtered, but not regulated, to provide
unregulated +24VDC to supply the flow switch, PWM
remote temperature reset, PWM remote current reset,
lead / lag select, and remote print circuitry which may
be utilized with user supplied contacts.
24VAC is also filtered and regulated to +24VDC to
be used by the optional EMS/BAS Circuit Boards for
remote temperature or remote current reset.
I/O Expansion Board
The I/O Expansion Board provides multiplexing to allow
additional inputs to be connected to the Microprocessor
Board via a single data line. The additional inputs are
multiplexed according to the selection made by the
Microprocessor through address lines.
Signals routed through the I/O Expansion Board include
Dis charge Temperature, Motor Protector Current
Transformer outputs (motor current signals from the
2ACE Module), and Oil Temperature.

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FORM 201.19-NM1 (204)

Included on the I/O Expansion Board are the outputs for
the slide valve control. This control consists of a Digital
to Analog Converter (DAC) and power transistors to
modulate current through the slide valve solenoids.
Relay Output Boards
One Relay Output Board per system operates the motor
contactors/starters, solenoid valves, and heaters which
control system operation.
The relay boards are located in the logic section of
the control panel(s). The boards convert 0 - 12VDC
logic levels outputs from the Microprocessor Board to
115VAC levels used by the contactors, valves, etc.
The common side of all relays on the Relay Output
Board is connected to +12VDC REG. The open collector
outputs of the Microprocessor Board energize the DC
relays or triacs by pulling the other side of the relay
coil/triac to 0VDC. When not energized, both sides of
the relay coils or triacs will be at +12VDC potential.

REMOVING 115VAC power to CB3 or
opening CB3 removes power from the
evaporator heaters. This could cause
evaporator freeze-up in low ambient
temperatures. Removing power from
or opening CB1 or CB2 removes power
from the respective compressor heater
and should be avoided.
1.8 TRANSFORMERS

3 Transformers (2T, 3T, and 4T) are located in the
Control Panel. These transformers convert the 115VAC
Control Power Input to 24VAC to operate the microprocessor circuitry.
2T: This 75VA transformer supplies the 24VAC
to the power supply board.
3T: Supplies the I/O Expansion Board # 1 voltage
for slide valve control.

1.6 CIRCUIT BREAKERS

Three Circuit Breakers are provided for the 115VAC
controls.
• CB1 allows removal of control power from System
1 for control system circuitry servicing: specifically,
the 115VAC feed to Relay Output Board 1 which
energizes contactors, solenoids, and system #1
compressor heater.
• CB2 allows removal of control power from System
2 for control system circuitry servicing: specifically,
the 115VAC feed to Relay Output Board 2 which
energizes contactors, solenoids, and system #2
compressor heater.
• CB3 allows removal of control power to the Microprocessor Board, Power Supply Board, I/O
Expansion Board, and Evaporator Heater.

The Circuit Breakers remove 115VAC
control power only. High voltage circuitry will still be energized from the
high voltage supply.

YORK INTERNATIONAL

4T: Supplies 24VAC power to the 2ACE Motor
Protector Modules.
1.9 MOTOR PROTECTION MODULES

A Motor Protection Module for each compressor is located in the Control Panel. These modules supply motor
over-temperature protection, 3-phase current protection,
phase imbalance, phase rotation, and a 7 segment display
for use when programming or troubleshooting.
The motor over-temperature protection is supplied by
3 temperature sensors imbedded in the motor windings
120 degrees apart. The module monitors these sensors,
allowing it to sense a hot winding and shut down the
compressor if motor cooling is inadequate.
The on-board C.T.s provide 3-phase current protection.
The C.T.s look at current on each phase of power to the
motor and send an analog signal proportional to average motor current to the I/O Expansion board and on to
the microprocessor board for microprocessor low/high
current protection and current display. This allows the
micro to monitor current and shut a system down if low
or high motor current is sensed. This is a non-adjustable
protection circuit electronically sized to a system's motor specifications.

125

Micro Panel Contents
Internally, the (3) on-board C.T.s and internal circuitry
allow the Motor Protection Module to protect against
high motor current as programmed on the Motor Protector dip switches. These switches are set at the factory
according to motor specifications.
The module also provides phase rotation protection to assure the screw compressor does not rotate backwards.
A single phase protection circuit located in the module
also monitors for a phase imbalance. If phase to phase
current imbalance exceeds the 17-25% average imbalance thresholds internally set in the module, the Motor
Protector will shut the system down.

FORM 201.19-NM1 (204)

Anytime the module faults, a thorough
investigation of the problem should be
performed before attempting to return
the system to operation. Failure to
per form this in ves ti ga tion could
lead to motor or compressor failure.
Always record the number displayed
on the module display before removing
power. Additional details on the Motor
Protection Module can be found on
page 16.

Whenever the Motor Protection Module senses a fault,
internal contacts M1-M2 will open, and shut the system
down. These contacts are wired in series with the compressor motor contactor. When the contacts open, the
micro will attempt to start the system 2 more times. Since
the motor contactor signal path from the Relay Output
Board to the motor contactor is broken by the Motor
Protection Module contacts, it will lock the system out
after 3 faults. The Motor Protection Module must then
be reset by removing 115VAC power from the Control
Panel using CB3. After the Motor Protector is reset, the
individual system SYS switch (S2-S5) must be switched
OFF and then ON to reset the microprocessor to allow
restart of the system.

Always review the data in the history
buffer when faults occur. Since the
Micro attempts to restart 2 more times
and fails to restart with the M1-M2
contacts open, the Micro will record
the last 2 faults of "Low Curr/MP/
HP". Hence, the third (3rd) history
buffer will show data related to the
true cause. See page 142 for additional
fault data.

126

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FORM 201.19-NM1 (204)

SIDE VIEW

29119A

INTEGRAL
C.T.'S (3)

TOP VIEW
NUMERICAL
VALUES

29121A

* DISPLAY
*NORMAL FLASHES
HA _ _ _. WHEN
IDLE, AND FLASHING
CIRCLE WHEN
SYSTEM IS
RUNNING.

SWITCH PUSHED TO LEFT INDICATES
ON.

29120A

SIDE VIEW

SWITCHES PLACED IN THE ON POSITION
ADD TO EQUAL THE OVERLOAD SETTING
VALUE.
FOR EXAMPLE, WITH 2 ON AND 128 ON,
DISPLAY WILL FLASH HA130.

FIG. 45 – MOTOR PROTECTION MODULE
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Micro Panel Contents
1.10

EMS/BAS CONTROLS

The microprocessor system can accept remote signals
to Start/Stop the chiller, adjust maximum allowable running current for each compressor, and adjust the chilled
liquid leaving temperature setpoint. These functions can
easily be controlled by connecting user supplied “dry”
contacts to terminals in the control panel.
Remote Start/Stop
Remote Start/Stop can be accomplished using a time
clock, manual contact or other “dry” contact in series
with the flow switch which is connected to Terminals
13 and 14 in the logic section of the control panel. The
contact must be closed to allow the chiller to run. Any
time this contact opens, the chiller will shut down and
the NO RUN PERM message will be displayed. The
location of the flow switch connection is shown in Section 1.12.

Never bypass a flow switch. This will
cause damage to the chiller and void
any warranties.

Wiring from remote “dry” contacts
(for stop/start and reset functions)
should not exceed 25 ft. (8 m) and
should be run in grounded conduit
that does not carry any wiring other
than control wiring or shielded cable.
If an inductive device (relay, contactor)
is supplying these contacts, the coil of
the device must be suppressed with a
suppressor YORK Part Number 03100808-000 across the inductive coil.
Remote Current Reset
The maximum allowable running current for each compressor can be adjusted remotely to a lower value using
repeated timed closure of “dry” contacts connected to
Terminals 13 and 16 located in the logic section of the
control panel (See Section 1.12). The duration of the
contact closure will determine the amount of adjustment.
Generally, this input is used for purposes of demand limit
and operates as follows:

128

FORM 201.19-NM1 (204)

Closing the input contact for a defined period of time
allows reset of the % Current Limit downward. Contact
closure of 1 - 11 seconds will allow % Current Limiting
to be adjusted downward from 105% by a maximum
of 75%, i.e. to a minimum value of 30% FLA. EMS
Current Limiting operates independently of the High
Average Current Unload (See Section 8.2). The micro
will always look at the two Current Limit Setpoints and
choose the lower as the controlling value, whenever
Remote Current Limiting is utilized. Contact closures
of less than 1 second will be ignored. A closure of 11
seconds is the maximum allowable closure and provides
a Current Limit reduction of 75%. The remote reset current can be calculated as follows:
REMOTE
RESET = 105% FLA
CURRENT

- {(Contact Closed Time -1sec) x (75% FLA)}
10 sec

For example, after a 4 second pulse, the offset would
equal:
Remote Reset Curr = 105% FLA - {(4sec - 1 sec) X (75%FLA)}
10 sec
= 105% - 225%FLA sec
10 sec
= 82.5% FLA

To maintain a given offset, the contact closure signal
must be repeated (refreshed) every 30 seconds - 30
minutes. The refresh is not accerted sooner than 30
seconds from the end of the last PWM signal, but must
be refreshed before 30 minutes has elapsed. After 30
minutes, if no refresh is provided, the setpoint will
change back to its original value.

After an offset signal, the new Remote
Current Limit may be viewed on the
EMS current Limiting Display under
the Motor Current Key (see Section
3.5). However, if this display is being
viewed when the reset pulse occurs, the
setpoint will not change on the display.
To view the new offset, first press any
other display key on the keypad and
then press the Motor Current Key.
Remote EMS Reset will not operate
when a Remote Control Center Option Kit is connected to the micro.
The Remote Control Center will always
determine the setpoint.
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FORM 201.19-NM1 (204)

Wiring from remote “dry” contact (for
reset functions) should not exceed 25
ft. (8 m) and should be run in grounded
conduit that does not carry any wiring
other than control wiring or shielded
cable. If an inductive device (relay,
contactor) is supplying these contacts,
the coil of the device must be suppressed with a suppressor YORK Part
Num ber 031-00808-000 across the
inductive coil.
Remote Current Reset must never be
used to control temperature. These
contacts are to be used only for periodic demand limiting purposes.
Remote Setpoint Temperature Reset
The chilled liquid leaving temperature setpoint programmed into the micro can be remotely adjusted to
a higher value using repeated timed closure of “dry”
contacts connected to Terminals 13 and 17 of TB4
located in the logic section of the control panel (See
Section 8.1.12). The duration of the contact closure will
determine the amount of adjustment. This is achieved
as follows:
The maximum allowable reset value can be programmed
from 2°F - 40°F (1°C - 22°C), as appropriate to the
application - see Section 6.4. Once the maximum reset
is programmed, an input contact closure of 11 seconds
provides the maximum reset. Closure for less than 11
seconds will provide a smaller reset. For noise immunity,
the micro will ignore closures of less than 1 second. To
compute the necessary contact closure time to provide
a required Reset, use the following steps:
Reset Temp ={ (Contact Closure - 1sec) X Programmed Max Reset}
10 sec
Offset

For example, with a programmed setpoint of 44°F (7°C),
after a 4 second pulse and a programmed maximum offset
of 40°F (22°C), the temperature offset would equal:
Reset Temp = (4 sec - 1 sec) X 40°F
10 sec
Reset Temp = 120°Fsec
10 sec
= 12°F (6°C)

To determine the new setpoint, add the reset to the
setpoint programmed into memory. In the example
above, if the programmed setpoint = 44°F (7°C), the
YORK INTERNATIONAL

new setpoint after the 4 second contact closure would
be 44°F (7°C)+ 12°F (6°C) = 56°F (13°C). This new
setpoint can be viewed on the display by pressing the
Remote Reset Temperature/Range key.
To maintain a given offset, the contact closure signal
must be repeated (refreshed) every 30 seconds - 30
minutes. The refresh is not accepted sooner than 30
seconds from the end of the last PWM signal, but must
be refreshed before 30 minutes has elapsed. After 30
minutes, if no refresh is provided, the setpoint will
change back to its original value.

After an offset signal, the new Remote
Setpoint may be viewed by pressing the
Remote Coding Setpoint Key. However,
if this display is being viewed when the
reset pulse occurs, the setpoint will
not change on the display. To view the
new offset, first press any other display
key on the keypad and then press the
Remote Cooling Setpoint Range key.
The new setpoint will then appear.
Remote Setpoint Reset will not operate
when a Remote Control Center Option
Kit is connected to the Micro. The
Remote Control Center will always
determine the setpoint.
Wiring from remote “dry” contact (for
reset functions) should not exceed 25 ft.
(8 m) and should be run in grounded
conduit that does not carry any wiring
other than control wiring or shielded
cable. If an inductive device (relay,
contactor) is supplying these contacts,
the coil of the device must be suppressed
with a suppressor YORK Part Number
031-00808-000 across the inductive
coil.
Remote Setpoint Reset must never be
used to control temperature. These
contacts are to be used only for
occasional temperature setback due to
outside ambient, changes in building
occupancy, or ice storage.

129

Micro Panel Contents
1.11

FORM 201.19-NM1 (204)

MICROPROCESSOR BOARD LAYOUT

3A
3
2

028979-G

ITEM
1
2

DESIGNATION
J18
RTC (U13)

EPROM

S2 to S5

DESCRIPTION
Clock Enable/Disable Jump Contact
Real Time Clock and Battery Backup I.C.
Microprocessor I.C. (label shows version)
NOTE : Dimple is positioned at top edge (3A)
Dip Switch Set (8 switches)
System Switches S2 = System 1
S3 = System 2
S4 = System 3
S5 = System 4

FIG. 46 – COMPONENT LAYOUT
130

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FORM 201.19-NM1 (204)

1.12

LOGIC SECTION LAYOUT

60 Hz Models :
5

8
7
028980-G

60 HZ MODEL LOGIC SECTION
ITEM
1
2
3
4
5
6
7
8

DESCRIPTION
Microprocessor Board
Back of Keypad
I/O Expansion Board # 1
Power Supply Board
Relay Output Board #1
Relay Output Board #2
Flow Switch & Customer Connection Terminals (TB4)
Circuit Breakers (115V)

FIG. 47 – LOGIC SECTION LAYOUT
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131

Micro Panel Contents
1.13

ANTI-RECYCLE TIMER

FORM 201.19-NM1 (204)

1.16

COMPRESSOR HEATER CONTROL

The programmable Anti-Recycle Timer allows the user
to select the compressor anti-recycle time to best suit
their needs. Motor heating is a result of inrush current
when the motor is started. This heat must be dissipated
before another start takes place or motor damage may
result. The anti-recycle timer assures that the motor has
sufficient time to cool before it is restarted.

Each compressor has its own heater. The heater will be
off whenever the compressor is running. As soon as the
compressor shuts off, the heater will turn on and stay on
for 5 minutes. After 5 minutes has elapsed, the heater will
shut off if the discharge temperature rises above 150 °F
(66°C) and will turn on when the discharge temperature
is equal to or less than 150 °F (66°C).

An adjustable timer allows for the motor cooling, but
gives the user the ability to extend the anti-recycle
timer to cut down on cycling. In some applications,
faster compressor start response is necessary and shorter
anti-recycle times are required. These needs should be
kept in mind, but whenever possible the timer should
be adjusted for the longest period of time tolerable.
600 seconds is recommended, although 300 seconds
provides adequate motor cooling time. Longer periods
will allow more heat dissipation, reduce cycling, and
possibly increase motor life. See Section 8.2, page 166
for programming of the anti-recycle timer.

1.17

1.14

1.15

EVAPORATOR PUMP CONTROL

Dry contacts are provided which transition (close)
when the Daily Schedule is calling for chiller operation, the unit switch is on, and power has been applied
to the Micro Panel for 30 seconds. If for some reason
the evaporator pump contacts have been closed to run
the pump and a power loss or Daily Schedule shuts the
pump down (contacts open), the contacts will not reclose
for any reason until 30 seconds has elapsed after power
re-application or 30 seconds have elapsed between a
Daily Schedule shutdown and restart.
If the Daily Schedule is not used, (On/Off times equal
00:00) the contacts will be closed at all times.

132

The evaporator heater is controlled by ambient temperature. When the ambient temperature drops below
40°F (4°C), the heater is turned on when the compressors
are turned off. When the temperature rises above 45°F
(7°C), the heater is turned off. An under voltage condition will keep the heater off until full voltage is restored
to the system. The heater will provide freeze protection
to -20°F (-28°C).

115VAC power must remain “ON”
through CB3 for freeze protection.
Otherwise, the evaporator must be
drained.

ANTI-COINCIDENCE TIMER

The Anti-Coincidence Timer assures that 2 systems
do not start simultaneously. This assures that inrush
current is kept to a minimum. A 60 second time delay
will always separate motor starts. This timer is not
programmable.

EVAPORATOR HEATER CONTROL

1.18

PUMPDOWN (EEV) CONTROL

Each compressor undergoes a pump down on shutdown. This assures that liquid refrigerant does not
enter the compressor on start-up, eliminating the need
for recycling pump down, saving energy and reducing
compressor starts and wear.
On start-up, the controls unload the compressor and immediately energize the pilot solenoid on the electronic
expansion valve. Normal operation commences without
pumpdown.
On shutdown, the microprocessor controls unload the
compressor, the pilot solenoid on the electronic expansion valve is de-energized, and the Economizer Liquid
Supply Solenoid Valve is de-energized. The compressor
continues to operate until it either pumps down to the
Remote evaporator applications equipped with
thermostatic TXV and Liquid Line solenoid will also
pump down on shutdown.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

low suction pressure cutout setting or for 180 seconds,
whichever comes first. Pump down occurs on “normal”
shutdowns where cooling demand has been satisfied or
when a system switch is turned off, a flow switch opens,
run permissive is lost or a Daily Schedule or a Remote
Shutdown is called for.
No pumpdown will occur on a safety shutdown. See
page 138 for the pumpdown display message.
1.19

ALARMS

Internal contacts are provided in the Micro Panel (See
Section 1.12) which can be used to remotely signal a
warning whenever a fault lockout occurs on any system
or if power is lost to the control panel. The internal
contacts are normally open (N.O.) and will close when
control power is applied to the panel, if no fault conditions are present. When a fault occurs which locks out
a system, the respective contacts open. If chiller power
is lost or a unit fault occurs, such as a Low Water Temp
fault, contacts for all systems will open.
Contacts for SYS 1 are located on the bottom right of
the microprocessor panel, terminals 23 and 24. SYS 2
contacts are located on terminals 27 and 28. See Fig. 11,
Page 38 for the location of these terminals.
A 28VDC or 120VAC (60 Hz models) or up to 240VAC
(50 Hz models) external alarm circuit (supplied by others) may be connected to these contacts. The contacts
are rated at 125VA.

If any inductive load devices (relay or
contactor) supplied by the user are in
the electrical circuit connected to the
dry alarm contacts, the device must
be suppressed at the load with a RC
suppressor YORK Part Number 03100808-000 across the inductive coil.
Fail ure to in stall sup pres sors will
result in nuisance faults and possible
damage to the chiller.

1.20

RUN STATUS (CHILLER)

Internal Chiller Run Status contacts between Terminal
28 and 29 close whenever one of the systems is running. These contacts are located on the bottom right of
the Microprocessor Board and are rated (voltage and
current) the same as the alarm contacts (Section 1.19).
Also use a suppressor, same as alarm contacts (Section
1.19). Individual system “Run Status” contacts are not
available.
1.21

LEAD / LAG COMPRESSOR SELECTION

The chiller may be set up for AUTO or MANUAL Lead/
Lag. This is accomplished by programming the option
under the Program Key. Details for programming the
Manual/Auto Lead/Lag Selection are discussed in Program Key Section 8, page 169.
When AUTO Lead/Lag is utilized, the micro attempts
to balance run time between the two compressors. A
number of conditions can occur which will prevent this
from happening. Factors determining lead/lag selection
and the resulting lead/lag determination are:
1. The micro automatically defaults the lead to SYS 1
and the lag to SYS 2 if both compressors are ready
to start (Anti-recycle Timers timed out) and compressors have equal run time.
2.

If all compressors are ready to start (Anti-recycle
timers timed out), the compressor with the lowest
run hours will start first.

3. If all compressors are waiting to start (Anti-recycle
timers have not timed out), the micro will assign the
lead to the compressor with the shortest anti-recycle
time in a an effort to provide cooling quickly.
4. If the lead compressor is locked out, faulted and
waiting to restart, SYS switch on the microboard
is off, or a run permissive is keeping an individual
system from running, the lag compressor is swapped
to the lead. This is true regardless of whether the
lag compressor is ON or OFF.

If the alarm circuit is applied in an
application used for critical duty (such
as process duty or cooling other critical equipment) and the alarm circuit
should fail to function, YORK will not
be liable for damages.

YORK INTERNATIONAL

133

Micro Panel Contents

FORM 201.19-NM1 (204)

MANUAL Lead/Lag selection will be automatically
overridden by the micro to allow the lag compressor to
automatically become the lead anytime the selected lead
compressor shuts down due to a lock-out, lead system
faults and is waiting to restart, system switch on the
micro board is in the OFF position, or if a run permissive
is keeping the lead system off. Automatic switch over in
MANUAL mode is provided to try to maintain chilled
liquid temperature as close to setpoint as possible.

For the first 3 minutes of operation, the micro will not
energize the solenoid. After 3 minutes of operation. If
the step of loading is above step 60 and the PR>2.2, the
micro energizes the economizer solenoid.

1.22

Economizer cycling is reduced by 2 timers. The timer
with the longest remaining time will dictate when the
economizer can turn on. The first timer is an "on to on"
timer which assures at least 10 minutes elapses from the
time the economizer turns on, off, and then on again for
a second time. The second timer assures that a minimum
of 3 minutes elapses from the time the economizer turns
off to the next time it is called to turn on again.

ECONOMIZER SOLENOID CONTROL

The economizer solenoid is controlled by the micro
based on the ability of the economizer to provide extra
capacity according to system operating conditions. This
ability is primarily based on outside ambient temperature. If the ambient is low with associated low discharge
pressure, the economizer will provide very little extra
subcooling. At an ambient of 90ºF (32ºC) or above
with associated high discharge pressure, the economizer
will begin to provide appreciable additional subcooling.
The extra subcooling may be as much as an additional
20ºF to 25ºF (11.1ºC to 13.8ºC), often making the total
subcooling at the TXV over 40ºF (4.4ºC).

Once on, the solenoid will remain on until the PR<2.0
or the step of loading falls below 50. If the conditions
drop below either of these points, the micro will turn
off the solenoid.

This should not be confused with
subcooling at the liquid valve, which
should generally be 12ºF to 15ºF (6.7ºC
to 8.3ºC). The micro monitors the difference in pressure ratio between the
discharge and suction pressure along
with the step of unloading to determine
economizer solenoid on/off points.
The micro utilizes the formula below to compute pressure ratio:
PR = (DP in PSIG)+14.7
(SP in PSIG)+14.7

134

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

PROCESS AND INSTRUMENTATION DIAGRAM

ECONOMIZER HX

LD03486

FIG. 47A – PROCESS AND INSTRUMENTATION DIAGRAM
YORK INTERNATIONAL

135

Micro Panel Contents

FORM 201.19-NM1 (204)

2. STATUS KEY: GENERAL STATUS MESSAGES & FAULT WARNINGS

29023A

2.1

GENERAL

Pressing the Status key displays the current chiller or
individual system operational status. The messages displayed include running status, cooling demand, fault
status, external cycling device status, load limiting, and
anti-recycle timer status. The display will show one message relating to the “highest priority” information as
determined by the microprocessor.
For individual system status or fault messages, the
display shows information for up to two refrigerant
systems.
The main categories of messages available using the
Status key are:
2.2

General Status Messages

2.3

Unit Warnings

2.4

Anticipation Control Status Messages

2.5

Chiller Fault Status Messages

2.6

System Fault Status Messages

These messages are described in detail below, with examples of each display. In each example “#” is used as
applicable to represent the system number where messages apply to individual systems.

136

2.2

GENERAL STATUS MESSAGES

Unit Switch OFF:
U N I T
SW I T C H
S H U T D OWN

O F F

This message indicates that the Chiller ON / OFF Switch
on the Control Panel is in the OFF position which will
not allow the chiller to run.
Schedule Shutdown:
D A I L Y
S C H E D U L E
S H U T D OWN

This message indicates that the that the chiller has been
shut down by the daily schedule programmed into the
Clock - Set Schedule / Holiday (Section 7.3).
Remote Controlled Shutdown:
R E MO T E
C O N T R O L L E D
S H U T D OWN

This message indicates that either an ISN or RCC (Remote Control Center) has turned the unit OFF through
the RS-485 port.
Compressors Running:
S Y S
S Y S

#
#

C OM P
C OM P

R U N N I N G
R U N N I N G

This message indicates that the respective compressor
is running due to demand.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

System Switches OFF:
S Y S
S Y S

#1
#2

System Loading Requirement:

SYS SWITCH OFF
SYS SWITCH OFF

S Y S
S Y S

This message indicates that the system switch on the
Microprocessor Board for the respective system is in
the OFF position. A system can only run if the system
switch is in the ON position. The switch for System 1
and System 2 should normally be in the ON position for
all models. See Section 1.11, Figure 46, page 130 for the
location of the system switches.
Anti-Recycle Timers:
S Y S
S Y S

#
#

A R
A R

T I M E R
T I M E R

1 0
1 2 0

S
S

The anti-recycle timer message shows the amount of
time remaining before a compressor can be called to
restart. The 300 - 600 sec. programmable timers begin
timing when a compressor starts, although a minimum
of two minutes must always elapse after a compressor
shuts down, before it may again restart. If a power failure
occurs, the anti-recycle timers will reset to 120 seconds
after power is restored. The purpose of the timer is to
allow for motor cooling to dissipate the heat generated
by inrush current at start-up.
Anti-Coincidence Timers:
S Y S
S Y S

#
#

C OM P
R U N N I N G
A C
T I M E R
2 2
S

The anti-coincident timer guards against two or more
compressors starting simultaneously. This avoids excessive instantaneous starting currents. A minimum of
60 seconds between compressor starts is maintained even
if demand is present and the anti-recycle timers are timed
out. The display shows the time before the respective
compressor can start. This display will only appear after
the anti-recycle timers have timed out.
Run Permissive Contacts OPEN:
S Y S
S Y S

#
#

N O
N O

R U N
R U N

P E R M
P E R M

This display indicates that an external cycling contact
and/or the flow switch connected to terminals 13 & 14 in
the Logic Section of the control panel is open. Whenever
the contact is open, the No Run Permissive message will
be displayed and the indicated system will not run.

YORK INTERNATIONAL

#
#

N O
N O

C O O L
C O O L

L O A D
L O A D

This message indicates that chilled liquid temperature
is below the point where the microprocessor will bring
the lead system on and/or that the loading sequence has
not loaded the chiller far enough to bring the lag system
on. The lag system will display this message until the
loading sequence is ready for the lag system to start.
MANUAL
OVERRIDE

If the MANUAL OVERRIDE key is pressed during a
scheduled time clock shutdown, the STATUS display
will display the MANUAL OVERRIDE message indicating that the schedule is being intentionally overridden. Typically MANUAL OVERRIDE is only used
in an emergency. As a result, the message is a priority
message and will override other STATUS messages.
2.3

UNIT WARNINGS

Unit Warnings are often caused by conditions which
require operator intervention to start the unit or extreme
operating conditions. All setpoints and programmable
values should be checked, if a chiller shutdown occurred, before restarting the chiller. Unit Warnings are
not logged into the HISTORY BUFFER.
Low Battery Warning
! !
L OW
B A T T E R Y
! !
C H E C K
P R O G / S E T P / T I M E

On power-up the microprocessor will check the RTC
(Real Time Clock) memory back-up battery to make
sure it is still operational. Provided the battery checks
out, operation will continue normally. If a check is made
and the battery has failed, the microprocessor will not
allow the chiller to run and the above Status message
will appear.

If a low battery condition exists, the
micro will restore programmed cutouts, setpoints, and schedules to their
default values.
Once a low battery condition is detected, the only way
to run the chiller is to use the Manual Override key - see
Section 8.7.4 page 165. This allows reprogramming of
setpoints, cutouts, and schedule.
137

Micro Panel Contents

FORM 201.19-NM1 (204)

The U13 RTC chip should be replaced as soon as
possible with Part # 031-00955-000. Otherwise, the
chiller will shutdown and lose all programmed points,
and require a MANUAL OVERRIDE restart, if a power
failure occurs.
Pump Down:
S Y S
S Y S

1
2

P U M P I N G
P U M P I N G

D OWN
D OWN

This message indicates that both refrigerant systems are
in a pumpdown cycle. Pumpdown display messages occur on shutdowns where the cooling load has been met,
or when a system switch is turned OFF. Note that only
one compressor could be pumping down, as shown in
the following display:
S Y S
S Y S

1
2

P U M P I N G
D OWN
C OM P
R U N N I N G

See Section 1.18 (page 132) for details of pumpdown
control.
Incorrect Refrigerant Warning:
R E P R O G R A M
T Y P E
O F
R E F R I G E R A N T
T O
R U N

The incorrect Refrigerant Warning will occur if the
DIP Switch setting for refrigerant type and the type
programmed into the micro “at the factory” under the
Service Mode are not the same. This message will be
displayed until the non-programmable “factory” programmed refrigerant type and DIP Switch setting agree.
See Page 179 for Service Mode programming.
Power Failure Warning:
The Power Failure Warning will only be displayed on
“power restoration” after a “power loss,” if manual restart on power failure is selected under the PROGRAM
key (page 170). If manual restart on power failure has
been selected, the following warning message is displayed indefinitely on power restoration and the chiller
will not run until the UNIT Switch is cycled OFF-and-on
to restart the unit. This safety is available for users who
desire a chiller lock-out on power failure.

This is typically not a desirable
feature to select. Most applications require auto-reset after a power failure.
Therefore, "Automatic" is typically
selected and programmed under the
PROGRAM key. See page 170.

138

! !
P OWE R
F A I L U R E
! !
C Y C L E
U N I T
SW I T C H

When this message appears, the chiller will not run and
the Unit Switch must be cycled OFF and ON to start
the unit.
Incorrect Unit Type Warning:
REPROGRAM
UNIT TYPE

The incorrect Unit Type Warning will occur if the DIP
Switch setting for unit type and the type programmed
into the micro "at the factory" are not the same. This
message will be displayed until the "factory" programmed unit type and DIP Switch setting agree. See
Page 179 for Service Mode Programming.
2.4

ANTICIPATION CONTROL STATUS
MESSAGES

Anticipation controls are built into the software to
prevent safety shutdowns by automatically overriding
the temperature controls, if system conditions approach
safety thresholds. This avoids total loss of cooling
resulting from a lockout by a safety control.
Anticipation controls monitor discharge pressure, motor
current and suction temperature for each compressor
and if maximum limits are approached, the slide valve
loading of the respective compressor will be reduced to
avoid exceeding the limit.
Displays of anticipation safety control messages and
their meanings are as follows:
Discharge Pressure Limiting:
S Y S
S Y S

#
#

D S C H
D S C H

L I M I T I N G
L I M I T I N G

Discharge Pressure Limiting takes effect when
compressor discharge pressure nears the point at which
the high pressure cutout would shut the system down.
When the above message appears, discharge pressure
has exceeded the programmable threshold and the
compressor is being unloaded in an effort to prevent
shutdown on the high pressure cutout. The operation of
this safety is important if condenser coils become dirty,
if there is a problem with the condenser fan operation,
or if extreme ambient or load conditions occur. See
Anticipatory Unloading Controls Page 161 for detailed
operation.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Compressor Motor Current Limiting:
S Y S
S Y S

#
#

C U R R
C U R R

L I M I T I N G
L I M I T I N G

The Motor Current Limiting message indicates that a
compressor motor current has reached a programmable
threshold or a BAS current limit threshold, and the
system is being unloaded to assure that motor current
does not become excessively high causing a fault. See
Anticipatory Unloading Controls Page 161 for detailed
operation.
Suction Temperature Limiting:
S Y S
S Y S

#
#

S U C T
S U C T

L I M I T I N G
L I M I T I N G

This message indicates that saturated suction temperature
on a system has dropped to 24°F (-4.4°C) in the
water cooling mode and that any further temperature
reduction could cause some icing of the evaporator
tubes. Saturated suction temperature is computed by the
micro by converting suction pressure to temperature.
See Anticipatory unloading controls page 161 for
deatailed operation. Suction limiting is not active in
the glycol mode.
2.5

UNIT FAULT STATUS MESSAGES

A Unit Fault will shut the entire chiller down when a
preset safety threshold is exceeded. The chiller will
automatically restart after the condition causing the
shutdown clears. Restart will occur only after anti-recycle timers are satisfied and cooling demand requires
additional cooling. A reset hysteresis is built into each
safety so repetitive faulting and clearing will not occur
in a short time period.
Continuous monitoring by the microprocessor assures
that instantaneous reaction results. When the chiller is
shut down on one of these safeties, a message will appear on the Status display informing the operator of the
problem as shown in the text that follows.
Any time that a Unit Fault occurs, the shutdown will be
logged into the HISTORY BUFFER.
Low Ambient Temperature Cutout:
L OW

U N I T
F A U L T
A M B I E N T
T E M P

The Low Ambient Temperature Safety prevents the
chiller from running in very low temperatures which
could cause damage due to low system pressures. This
feature is programmable and can also be used to shut
down the chiller at a temperature where continued runYORK INTERNATIONAL

ning of the chiller is not economical compared to the
use of “free” cooling techniques (see also Section 8.2
/ Low Ambient Temperature Cutout [page 168]). The
fault will clear when ambient temperature rises 2°F
(1°C) above the cut-out.
High Ambient Temperature Cutout:
U N I T
F A U L T
H I G H
A M B I E N T
T E M P

The High Ambient Temperature Safety protects the
chiller from running in ambients above 130°F (54°C)
where potential malfunction of system mechanical and
electrical components may result. The High Ambient
Cutout is programmable and can be set for lower limit
values if required (see also Section 8.2 / High Ambient
Temperature Cutout [page 168]). The fault will clear
when ambient temperature drops 2°F (1°C) below the
cut-out.
Low Leaving Chilled Liquid Temperature Cutout:
U N I T
F A U L T
L OW
L I Q U I D
T E M P

The Low Liquid Temperature Safety assures that the
evaporator is not damaged from freezing due to improperly set control points. It also attempts to protect
the chiller from freezing, if the flow switch should fail.
However, the flow switch should always be regarded
as the primary safety. Whenever the chilled liquid
temperature drops below the programmable cutout, the
chiller will shut down (see also Section 8.2 / Leaving
Water Temperature Cutout, page 168). The chiller fault
will clear when temperature rises 4°F (2°C) above the
cut-out and cooling demand exists.
115VAC Under Voltage Cut-Out:
U N I T
F A U L T
1 1 5 V A C
U N D E R
V O L T A G E

The Under Voltage Safety assures that the system is
not operated at voltages where malfunction of the microprocessor could result in system damage. Whenever
the microprocessor senses an on-board control power
supply failure while a compressor is running, the chiller
is shut down. The microprocessor circuitry is capable of
operating at voltages 10% below the nominal 115VAC
supply to the panel. Auto-restart of the chiller occurs after a 2 minute start-up timer has elapsed from
the time when power is reapplied, if the AUTO RESTART ON POWER FAILURE is enabled. Otherwise
the chiller must be manually reset. See Section 8.2
(page 170).
139

Micro Panel Contents

FORM 201.19-NM1 (204)

High Discharge Pressure Cutout:

Flow Switch Open:
S Y S
S Y S

#
#

N O
N O

R U N
R U N

P E R M
P E R M

Closure of the flow switch is monitored to check that
flow is present in the evaporator when a compressor
is running. Any external cycling devices fitted by the
customer are connected in series with the flow switch.
YCAS 2 System chillers require a single flow switch
wired to the control panel. If the flow switch opens, all
systems will shut down and a NO RUN PERM (Permissive) message will be displayed. Closing of the flow
switch, when flow is present, will cause the message to
disappear and auto-restart to occur.

Never bypass a flow switch. This will
cause damage to the chiller and void
any warranties.

2.6

SYSTEM FAULT (SAFETY) STATUS
MESSAGES

A System Fault will shut the affected system down
whenever a preset safety threshold is exceeded for 3
seconds. Automatic restart will occur after the first 2
shutdowns when the anti-recycle timer times out and
temperature demand exists. After any combination of 3
Manual Reset Safeties in a 90 minute time period, the
affected system will shut down and lock out on the last
fault. When one or more systems are shut down on one
of these safeties, a message will appear on the Status
display informing the operator of the problem.

The High Motor Current Safety is a
unique safety which will lock out a
system after only a single fault.

To reset a locked out system, turn the System Switch
for the affected system to the OFF position, then back
to the ON position (see Section 1.11, Page 130, Fig. 46
for switch locations).

Before returning a locked out system
to service, a thorough investigation of
the cause of the fault should be made.
Failure to repair the cause of the fault
while manually allowing repetitive
restarts may cause further expensive
damage to the system.
140

S Y S
S Y S

#
#

H I G H
H I G H

D S C H
D S C H

P R E S
P R E S

The Discharge Pressure Safety prevents system pressure
from exceeding safe working limits. This safety is a
backup for the mechanical High Pressure Cutout in each
system. The Discharge Pressure Safety is programmable
for a range of values below the system upper limit (see
Section 8.2 / Page 166, High Discharge Pressure Cutout
for more details).
High Discharge Temperature Cutout:
S Y S
S Y S

#
#

H I G H
H I G H

D S C H
D S C H

T E M P
T E M P

This safety protects the compressor rotors from damage
due to overheating, expansion, and breakdown of the oil
film seal between the rotors. It also protects against excessive oil temperature in the discharge oil separator.
For the first 4 seconds of operation discharge temperature is ignored. After 4 seconds of operation the
compressor will shut down if the discharge temperature
exceeds 260°F (127°C).
High Oil Differential Pressure Cutout:
S Y S
S Y S

#
#

H I G H
H I G H

O I L
O I L

D I F F
D I F F

The High Oil Pressure Differential Safety protects the
compressors against loss of proper lubrication due to
oil line blockage. The “differential oil pressure” for this
safety is computed by measuring discharge pressure and
subtracting oil pressure returning to the compressor
(Discharge - Oil = Oil PSID). Under normal operation,
the oil pressure differential display will be less than 25
PSID (1.7 bar), typical 2 - 10 PSID (0.1 to 0.7 bar). If
oil pressure at the compressor drops due to filter blockage, the differential pressure on the display will increase
and when the maximum limit is reached, the compressor
will be shut down.
This safety is activated after 3 minutes of operation. Oil
pressure must be less than 65 PSID (4.4 bar) for R22
models as long as the compressor continues to run.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Low Oil Differential Pressure Cutout:
#
#

L OW
L OW

O I L
O I L

D I F F
D I F F

The Low Oil Pressure Differential Safety assures the
compressor receives proper lubrication by monitoring
the differential between oil pressure returning to the
compressor and suction pressure. Lack of a differential
indicates that the compressor is not pumping and no oil
is being pumped through the compressor to lubricate
the bearings and rotors.
This type of oil failure will not be picked up by the High
Oil Differential Safety since no flow will cause the differential through the oil piping to drop to zero.
During normal operation, differential oil pressure must
be greater than 50 PSID. At start-up, the cut-out is
ramped over time according to ambient temperature.
For ambients above 50°F (10°C), the Low Oil Differential Safety is activated after 1 minute of compressor
operation when the oil pressure differential must be
greater than 10 PSID (.7 bar). After 2 minutes it must
be greater than 20 PSID (1.4 bar); after 3 minutes, 30
PSID (2 bar); after 4 minutes, 40 PSID (2.7 bar); and
from 5 minutes of operation and onwards, oil pressure
must remain higher than 50 PSID (3.4 bar) or the system
will be shut down. For lower ambients, the linear ramp
times are as follows:
AMBIENT TEMP
>50°F
(10°C)
>45°F
(7°C)
>40°F
(4°C)
>35°F
(2°C)
>30°F
(-1°C)
<=30°F
(-1°C)

RAMP TIME
5 Minutes
6 Minutes
7 Minutes
8 Minutes
9 Minutes
10 Minutes

High Oil Temperature Cutout:
S Y S
S Y S

#
#

H I G H
H I G H

O I L
O I L

T E M P
T E M P

This safety assures oil temperature does not exceed a safe
operating temperature which affects compressor lubrication. Typical oil temperature during normal operation
will be approximately 130 - 150°F (54 - 66°C).

S Y S
S Y S

#
#

L OW
L OW

S U C T
S U C T

P R E S S
P R E S S

The Low Suction Pressure Cutout aids in protecting the
evaporator from damage due to ice build up caused by
operation at low refrigerant charge or restricted refrigerant flow. A transient timer feature prevents nuisance
trips during start-up, compressor loading, etc. The Low
Suction Pressure Safety is programmable (see Section
8.2 / Page 167, Low Suction Pressure Cutout for more
details).
The suction pressure cut-out is ignored for the first 45
seconds of operation. During the next 180 seconds of
running, suction pressure may be lower than the cutout,
but must be greater than:
SP Cutout= Programmed Cutout X (run Time - 25)
200

This cutout value increases with time (10% to 100%)
until after 225 seconds it equals the programmed cutout value. If suction pressure falls below the calculated
cutout value before 225 seconds of run time, the system
will be shut down.
The following graph shows a typical programmed suction pressure cutout of 44 PSIG (3 bar) and its change
from time = 0 sec of compressor run time to 225 seconds
of compressor run time.

Suction Pressure Cutout

S Y S
S Y S

Low Suction Pressure Cutout:

40
35
30
25
20
15
10
5
0
0

120

150

180

210

240

270

310

Run Time (seconds)

Suction Pressure Cutout With
44 PSIG Programmed Cutout

LD07013

FIG. 48 – SUCTION PRESSURE CUTOUT

The High Oil Temperature Safety is activated after 2
minutes of compressor operation, after which if oil
temperature is above 225°F (107°C) for more than 3
seconds, the compressor will shut down.
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141

Micro Panel Contents
After 225 seconds of operation with suction pressure
operating above the cut-out, a 30 second transient timer
prevents short term fluctuations in suction pressure due
to loading or fan cycling from causing shutdown. If
suction pressure drops below the cutout point after 225
seconds of operation, the transient timer is activated.
While the transient timer is active, suction pressure must
not drop below 10% of the cut-out initially programmed
and must be greater than:
C.O. = Programmed C.O. X ( Run Time -25 )
200

This transient cutout value increases with time until after
30 seconds it equals the programmed cutout value. If the
suction pressure falls below the value as calculated by
the formula relative to time, the system will shut down
on a low suction pressure fault. If the suction pressure
rises above the programmed cutout value, the 30 second
timer will be reset.
If the Dip Switch on the microprocessor board is set
for “Water Cooling” (see page 146), the cutout is programmable between 44 - 70 PSIG (3-5 bar) for both
R-22 and R407C models. In this mode, settings of 44
PSIG (3 bar) for R-22 and R407C are recommended. If
the Switch is set for “Brine Cooling” (glycol) the cutout is programmable between 5 - 70 PSIG (0.3 - 5 bar)
for R-22 and R407C models. In this mode, the cutout
should typically be set to the saturated refrigerant pressure equivalent to 18°F (10°C) below the temperature
of the chilled liquid.

FORM 201.19-NM1 (204)

S Y S
S Y S

#1
#2

This safety can be triggered by two events. The first
is when suction superheat <0.5ºF. The second is when
the pilot solenoid is closed 10 times in 2 minutes due
to low superheat.

142

FAILURE
FAILURE

This safety will shut down a system if either suction temperature or suction pressure sensors read out of range high
or low. This condition must be present for 3 seconds to
cause a system shutdown. The safety locks out a system
after the first fault and will not allow automatic restarting.
High Compressor Motor Current Cutout:
S Y S
S Y S

#
#

H I G H
H I G H

M T R
M T R

C U R R
C U R R

The High Motor Current Safety protects against excessively high motor current and shuts a system down and
locks it out after only a single occurrence of a rise in
average motor current above the cutout point. Motor
current is monitored using 3 Current Transformers (CTs)
per motor, one on each phase. The C.T.'s are part of the
Motor Protector Module.
Average motor current is monitored after 7 seconds of
compressor operation. The system will be shut down if
average motor current exceeds 115% FLA. This safety
only requires one shutdown to lock out a system.

FLA (full load amps) is approximately
1.08 x RLA (rated load amps). RLA is
specified on the motor / chiller nameplate and is typical current demand
under rated operating conditions in
a fully loaded system. When a system
is fully loaded, typical motor currents
may be 60 - 85% FLA depending on
operating conditions.

LOW SUPERHEAT
LOW SUPERHEAT

The Low Superheat Cutout is to protect the compressor(s)
from liquid floodback due to low suction superheat. This
safety is ignored for the first 30 seconds of system runtime.

SENSOR
SENSOR

The Sensor Failure Safety prevents the system from
running when the sensors measuring superheat are not
functioning properly. This safety is ignored for the first
15 seconds of system runtime.

The sludge point of the glycol MUST be
at least 20°F (11°C) below the equivalent
cutout temperature.

S Y S
S Y S

#1
#2

Low Motor Current Cutout / Motor Protector (Hi
Motor Winding Temp Cutout) / Mechanical High
Pressure Cutout / External Motor Overload:
S Y S
S Y S

#
#

L OW
L OW

C U R R / M P / H P
C U R R / M P / H P

The Low Motor Current Safety prevents a compressor
motor running with less current than would normally be
expected. This may result from loss of refrigerant, a defective contactor, power problems, or from a compressor
that is not pumping due to a mechanical malfunction.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Motor current is monitored using 3 Current Transformers (CTs) per motor, one on each phase. The C.T.'s are
located in the Motor Protector Module.
Average motor current is monitored after 4 seconds of
compressor operation. From this time the system will
be shut down if average motor current is less than 10%
of FLA.
Compressor Motor Protection Modules, and Mechanical High Pressure Cutouts are integral to each
system. All of these devices stop the compressor by
removing power from the motor contactor coils. This
causes the CTs to obviously sense a zero current draw
by the compressor motor and causes a Low Motor Current Fault to be displayed. These devices operate as
follows:

407C units. If the refrigerant temperature falls below
20°F (11.1°C) in water cooling mode, the system will
be shut down. If the refrigerant temp falls 15°F (8.3°C)
below the leaving chilled liquid temp in glycol cooling
mode, the system will shut down. If a malfunctioning or
missing evaporator inlet refrigerant temp sensor reads
out of range low, the system will also shut down. The
low evap temp safety is ignored for the first 3 minutes
of operation. After 3 minutes of run time there is a 5
minute Low Evap Temp Safety Bypass Ramp: Any time
the evaporator inlet temperature drops below the cutout,
the cutout will be lowered 6ºF and ramped up to original
value over the next 5 minutes. If the evaporator inlet
temperature rises above the original cutout during the
ramp, the cutout will be reset to the original value and
the ramp will be ended.
2.7

The Motor Protection Module protects against excessive motor winding temperature by monitoring sensors built into the motor windings. If the temperature
becomes excessive, the module will cause power to be
removed from the compressor contactors shutting down
the compressor. Auto restart will not occur since manual
reset by power removal is required. A fault lockout will
automatically occur after the micro attempts 2 more
starts with the MP contacts open. Manual reset is accomplished by removing 115VAC control power from
the micro panel after the motor sensors have sufficient
time to cool. Details relating to operation of the Motor
Protection Module can be found on page 16.
The Mechanical High Pressure Cutout protects against
excessive refrigerant discharge pressure and is set to
405 PSIG (28 bar). Auto-restart will be permitted after
shutdown on discharge pressure, when the pressure
drops below 330 PSIG (23 bar) and the cutout contacts
close. A fault lockout will result if safety thresholds are
exceeded three times in a 90 minute period.

PRINTOUT ON FAULT SHUTDOWN

If an optional printer is installed, the contents of History Buffer 1 will be sent to the printer any time a fault
shutdown occurs. This will allow record keeping of
individual faults, even if they do not cause a lockout of
the system. This information may be useful to identify
developing problems and troubleshooting.
The No Run Permissive fault messages will not be
stored in the History Buffer and will not cause an auto
printout.

Due to extreme operating conditions
or systems where control deficiencies
are present, occasional faults may
occur with the corresponding automatic printout. This is not a cause for
concern.

Low Evaporator Temperature Cutout (R407C Only):
S Y S
S Y S

1
2

L OW
L OW

E V A P
E V A P

T E M P
T E M P

The Low Evaporator Temperature Cutout is to protect
the evaporator from freeze-up with R-407C. This safety
uses the Evaporator Inlet Refrigerant Temp Sensors to
monitor evaporator inlet refrigerant temperature on
each system. These sensors are only installed on R-

YORK INTERNATIONAL

143

Micro Panel Contents

FORM 201.19-NM1 (204)

3. DISPLAY KEYS & OPTION SWITCHES

29023A

3.1

GENERAL

The Display keys provide direct access to retrieve commonly required data about the operation of the chiller.
This is particularly useful during commissioning, monitoring the operation of the chiller, diagnosing potential
future problems and service troubleshooting.
When a Display key is pressed, the corresponding message will be displayed and will remain on the display
until another key is pressed.
Displayed data is in “real-time” and is updated approximately every 2 seconds. If updating of one of the
messages is required faster than every 2 seconds, the
appropriate key for the desired display can be pushed
and held to provide updating every 0.4 seconds.
Display Messages may show characters indicating
“greater than” (>) or “less than” (<). These characters
indicate the actual values are greater than or less than
the values which are being displayed, but are outside
the ability of the micro to give an actual reading. This

144

is unlikely to occur unless a problem exists in the measuring sensors or during extreme conditions.
The Display keys and the data available from each is
as follows:
3.2

CHILLED LIQUID TEMPS KEY

When the Chilled Liquid Temperatures key is pressed a
display of chilled liquid temperatures leaving the chiller
(LCHLT) and returning to the chiller (RCHLT) is provided as follows:
L C H L T
R C H L T

=
=

4 4 . 2
5 4 . 0

°
°

F
F

If the key is pressed again, the following message will
appear if an optional mixed chilled leaving temp sensor
is installed for multi unit sequencing. If a sensor is not
installed, pressing the key will have no effect.
M C H L T

4 3 . 8

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

3.3

Slide valve position is APPROXIMATE
and should be used for reference only.
Under actual conditions the compressor may be fully loaded between
step 60 - 75 and fully unloaded between
step 0 - 35.

SYSTEM # DATA KEYS

Pressing one of the System # Data keys a number
of times scrolls through displays of differential oil
pressure (OIL), suction pressure (SP) and discharge
pressure (DP), oil temperature, suction temperature
(ST), discharge temperature (DT), saturated suction
temperature, suction superheat, saturated discharge
temperature, discharge superheat and compressor slide
valve position.
Examples of these displays are shown where # is the
appropriate system number:
S Y S
S P =

#
O I L =
6 4
D P =

1 7 6
1 9 5

S Y S
S T =

#
O I L
=
3 1 . 0
D T =

S #
S A T
S U C T
S U C T
S H E A T

P S I G
P S I G

1 5 7 . 4 ° F
1 2 3 . 2 ° F
=
=

3 2 . 9 ° F
1 5 . 0 ° F

S #
S A T
D S C H = 1 3 0 . 0 ° F
D S C H
S H E A T
=
5 4 . 3 ° F
S Y S

S T E P

S Y S
#
C O O L E R
R E F R I G
T E M P =

Superheats are the difference between the respective
saturated temperature (converted from pressure) and the
actual. Display Limits for the System Pressures and
Temperatures displays are as follows:

Oil Pressure
Suction Pressure
Discharge Pressure
Suction Temp.
Discharge Temp.
Oil Temp.
Sat. Discharge Temp.
Sat. Suction Temp.
Slide Valve Position
Suction Superheat
Discharge Superheat

MAX. LIMIT
0 PSID (0 Bar)
199 PSIG (14 Bar)
399 PSIG (28 Bar)
84.2 °F (29°C)
302.6 °F (150°C)
240.0 °F (116°C)
140.5 °F (60°C)
101.3 °F (39°C)
100% (100%)

°F (-63.1°C)
* -81.5
22.5 °F (-5.3°C)

60.9 °F (16°C)
216.0 °F (102.2°C)

Minimum and maximum values may
change as software (EPROM) revisions are made.

I N L E T
2 8 . 2 ° F

* Below 9.0°F (13°C), the Suction
Temp. display will disappear. This will
in turn cause the Superheat display to
disappear.

The Evaporator Inlet Temp. display
will only appear if the chiller is selected
for R407C.

Temperatures and pressures are either measured directly
by transducers and temperature sensors, or computed
from these measurements as follows:
Saturated discharge and suction temperatures are
computed by converting measured pressure to temperature.
Slide Valve Position is computed based on the number
of loading steps that the micro has sent to the slide
valve solenoid in the form of a voltage signal. To the
microprocessor, STEP 0 = fully unloaded and STEP 75
= fully loaded.
YORK INTERNATIONAL

MIN. LIMIT
208 PSID (14 Bar)
0 PSIG (0 Bar)
0 PSIG (0 Bar)
9.0 °F (-13°C)
40.3 °F
(5°C)
40.3 °F
(5°C)
-41.0 °F (-41°C)
-41.0 °F (-41°C)
0%
(0%)

3.4

AMBIENT TEMP KEY

When the Ambient Temperature key is pressed, ambient
air temperature, as measured surrounding the chiller, is
displayed.
A M B I E N T
A I R
T E M P
=
7 1 . 9
° F

Display Limits: Minimum - 4.6°F (-20.3°C)
Maximum 137.9°F (58.8°C)

145

Micro Panel Contents
3.5

FORM 201.19-NM1 (204)

% MOTOR CURRENT KEY

Pressing the Motor Current key displays compressor
current for each system:
C OM P
C OM P

1 = 6 3
2 = 3 0

A M P
A M P

8 5 % F L A
4 1 % F L A

This display shows the average motor current in amps
and average compressor motor current as a percentage
of FLA. All values are approximate.
I S N
E M S

C R N T
C R N T

L I M I T :
L I M I T :

N O N E
N O N E

On the second press of the of the Motor Current Key,
the current limit values as set by the ISN (Remote BAS
System) and EMS-PWM current limiting input are
displayed, if they are active. See Sections 1.10, and 2.4
for more details.
3.6

OPERATING HRS / START COUNTER KEY

When the Operating Hours / Starts Counter key is
pressed, the accumulated running hours and starts for
System 1 and 2 compressors are displayed. Where applicable, pressing the key again displays the values for
Systems 3 and 4 on larger models:
H R S
S T R

1 =
1 =

1 1 4 3 . 2
2 8 5 . 2

=
=

1 3 8 2
3 2 2

H R S
S T R

3 =
3 =

1 2 5 5 . 4
3 6 5 . 4

=
=

1 0 9 5
4 5 5

Display Limits :

Maximum run hours 99,999
Maximum starts 99,999

Values roll over to zero, if the maximum limit is exceeded.

These counters are zeroed at the factory, but may indicate run time and
number of starts logged during factory testing prior to shipment.

the switches is important during the commissioning of
the chiller. The Options key can be used to verify the
Dip Switch positions without looking at or handling the
Microprocessor Board.
Each press of the key will scroll to the next option/dip
switch setting. Option Switch Messages (S1-1 to S18) will then be displayed in sequence. At the end of the
sequence, the display will automatically revert to the
first Option Switch message.
The following is a detailed guide to programming the
Dip Switches together with the associated display message provided for each selection when the Options key
is pressed:
SWITCH 1: Water / Glycol Cooling
Open:
S 1 - 1

OPTIONS KEY &
DIP SWITCH SETTINGS

The Options key provides a display of options which are
programmed by the positions of the S1 Dip Switches
on the Microprocessor Board. Proper programming of
146

L I Q U I D

Water Cooling Mode is for water cooling applications
and allows the chilled liquid leaving temperature setpoint to be programmed from 40 to 70 °F (4 to 21°C).
Selecting this mode also auto-programs the Low Chilled
Liquid Cut-Out at 36°F (2°C) and the Suction Pressure
Cut-Out at 44 PSIG (3 bar).
Closed:
S 1 - 1

C H I L L E D
L I Q U I D
G L Y C O L

Glycol Cooling Mode is for brine/glycol applications with
setpoints below 40°F (4°C) and allows the chilled liquid
leaving temperature setpoint to be programmed from 10 to
70°F (-12 - 21°C). In this mode, the Low Chilled Liquid
Cut-Out can be programmed from 8 to 36° F (-13 to 2°C)
and the Suction Pressure Cut-Out programmed from 20
to 70 PSIG (1 to 5 bar) for R-22 models and 5 to 70 PSIG
(0.3 to 5 bar) for R407C models.
SWITCH 2: Ambient Temp. Range Low Ambient
Cutout
Open:
S 1 - 2

3.7

C H I L L E D
WA T E R

A M B I E N T
C O N T R O L
S T A N D A R D

Standard Ambient Mode auto-programs the Low Ambient
Cutout setting at 25°F (-4°C) and is not adjustable.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Closed:
S 1 - 2

Dip Switch Physical Location and Setting
A M B I E N T
C O N T R O L
L OW
A M B I E N T

Low Ambient Mode allows the Low Ambient Cut-Out
to be programmed from 0 to 50 °F (-18 to 10°C). Values
above 25°F (-4°C) can be used to automatically shut
down the chiller when direct cooling methods become
operational.
SWITCH 3: Refrigerant
Open:
S 1 - 3

R E F R I G E R A N T
R - 4 0 7 C

The R-407C Mode MUST be selected for models using
refrigerant R-407C. Incorrect selection of this switch
may cause serious damage to the chiller.
Closed:
S 1 - 3

R E F R I G E R A N T
R - 2 2

028981-G

The R-22 Mode MUST be selected for models using
refrigerant type R-22. Incorrect selection of this switch
may cause serious damage to the chiller.

“OPEN” Position:
Left side of switch
pushed in

SWITCH 4: Unit Type
Open:
S 1 - 4

YCWS
LD03511B
LD03511A

DO NOT USE THIS POSITION.

Incorrect programming may cause
damage to the chiller.

FIG. 49 – ENLARGED PHOTOGRAPH OF DIP
SWITCHES ON MICROPROCESSOR BOARD

SWITCH 5: Motor Current Average option
(start-up)

Closed:
S 1 - 4

“CLOSED” Position:
Right side of switch
pushed in

YCAS

Open:
S 1 - 5
MOTOR CURRENT
AVERAGING ENABLED

Place the switch in the CLOSED position selects the
type of chiller as an air cooled chiller (YCAS). The
switch MUST always be in the CLOSED position.

Incorrect programming may cause
damage to the chiller.

YORK INTERNATIONAL

DO NOT USE THIS POSITION.
Nuisance trips at start-up could result.

147

Micro Panel Contents
Closed:
S 1 - 5
MOTOR CURRENT
AVERAGING DISABLED

FORM 201.19-NM1 (204)

the chiller for an EEV (Electronic Expansion Valve).
The switch MUST be placed in the CLOSED position.

Incorrect programming may cause
damage to the chiller.

Placing the switch in the CLOSED position, disables
motor current averaging protection at start-up. It is recommended that this option be selected to avoid nuisance
start-up trips especially at extreme ambient/operating
conditions.
SWITCH 6: Heat Recovery

SWITCH 8: Standard Options

Open:

Open:
Standard Options Enabled.

S 1 - 6

HEAT RECOVERY
DISABLED

Placing the switch in the OPEN position, disables the
heat recovery option. The switch MUST be placed in
the OPEN position.

Incorrect programming may cause
damage to the chiller.

Closed:
Do ot use.
SUMMARY OF SETTINGS
The following table gives a summary of Modes (displayed messages) which can be selected using the Open
and Closed positions for each of the eight SW1 Dip
Switches.
SWITCH

SWITCH "OPEN"
SETTING

SWITCH "CLOSED"
SETTING

Water Cooling

Glycol Cooling

Standard Ambient
Control

Low Ambient Control

Refrigerant R-407C

Refrigerant R-22

Do Not Use

YCAS

Do Not Use

Motor Current
Averaging (Start-Up)
Disabled

Heat Recovery
Disabled

Do Not Use

Expansion Valve
Thermostatic

Expansion Valve
Electronic*

Standard Options
Enabled

Do Not Use

Closed:
S 1 - 6

HEAT RECOVERY
ENABLED

DO NOT USE THIS POSITION.

Incorrect programming may cause
damage to the chiller.

SWITCH 7: Expansion Valve Type
Open:
S 1 - 7

EXPANSION VALVE
THERMOSTATIC

Placing the switch in the OPEN position, configures the
chiller for a TXV. TXV's will never be used on standard
chiller packages. The switch MUST NEVER be placed
in the OPEN position.
Closed:
S 1 - 7

EXPANSION VALVE
ELECTRONIC

Placing the switch in the CLOSED position, configures
148

3.8

FUNCTION KEY

Pressing the Function key only displays the same message as pressing the Status key. Pressing the Function
key followed by another display key will scroll through
all the data available under that key once. E.g., pressing
the Function key followed by the System 1 Data key will
result in scrolling through the 5 displays shown in Section
3.3 without the need to press the System 1 Data key to
scroll to the next display. After scrolling through the data,
the display returns to the status message.
The following keys can be scrolled using the Function
Key: Chilled Liquid Temps, System # Data, Motor Current and Options.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

4. PRINT KEYS

29023A

4.1

GENERAL

The Print keys provide access to two sets of information
either locally on the panel display or, if an optional
printer is connected, remotely as hard copy printouts.
The Operating Data (Oper Data) key provides a realtime list of system operating data and programmed
settings. The History key provides a comprehensive
list of operating data and programmed settings “at the
instant of fault” on each of the last six faults.
4.2

OPER DATA KEY

If a remote printer is not connected, pressing the Operating Data key allows the user to scroll through information, on the 40 character display, which is not directly
available from the Display keys on the panel.
If a remote printer is connected, pressing the Operating
Data key causes a snapshot to be taken of system operating conditions and of the user programming selections.
The data is stored in temporary memory, then transmitted
from the microprocessor to the remote printer. As the
data is transmitted it is erased from the memory.

YORK INTERNATIONAL

Information available using the Operating Data key is described in the following sections. In example displays “ # ”
is used to indicate system number where appropriate.
4.3

OPERATING DATA –
LOCAL DISPLAY MESSAGES

YCAS 2 System Models :
When the Operating Data key is pressed, the following
message appears:
O P E R A T I N G
D A T A
D I S P L A Y S

Repetitively pressing the
keys will scroll through
the following Common (whole chiller) Data and individual System Data information displays.
Common Data:
L O A D
U N L O A D

T I M E R
T I M E R

1 0
0

S E C
S E C

This message shows the time remaining on the Load
Timer and the Unload Timer. These Timers constantly
recycle and are used in conjunction with “rate control”
and “temperature deviation from setpoint” to determine
when loading/unloading should occur.

149

Micro Panel Contents

T E M P
T E M P

E R R O R
R A T E
-

FORM 201.19-NM1 (204)

0 0 . 5
° F
0 . 9
° F / M

The upper message indicates the difference (error)
between actual leaving chilled liquid temperature and
the programmed Target temperature. The lower message
indicates the rate of change of the chilled liquid leaving
temperature in degrees per minute. A minus sign (-)
indicates falling temperature. No sign indicates rising
temperature.
L E A D
S Y S T E M
I S
S Y S T E M
N U M B E R

This message advises which system is programmed as
the lead.
E V A P
E V A P

P U M P
I S
H E A T E R
I S

O F F
O N

This message indicates the position of the optional
auxiliary contacts for the evaporator water pump and
the status of the evaporator heater.
For the evaporator pump contacts, ON = contacts closed,
OFF = contacts open.
The Evaporator Heater status is controlled on ambient
temperature as follows: If measured ambient falls below
40°F (4°C), the Evaporator Heater is switched ON. If
measured ambient then rises above 45°F (7°C) the heater
is switched OFF. The evaporator heater prevents water
standing in the evaporator from freezing.
A C T I V E

R E MO T E
N O N E

C T R L

This message indicates that a remote device such as a
Remote Control Center, an ISN controller, or another
device sending a PWM signal for temperature or current
reset is overriding control points programmed through
the keypad or default microprocessor setpoints. The
following displays may be encountered:
NONE

–

No remote control active. Remote
monitoring may be active.

ISN

–

YorkTalk via ISN or Remote Control
Center (remote mode).

PWM CURR – EMS PWM Current Limiting Enabled

System Data:
The following sequence of three displays are provided
first for System 1, then for System 2, and then for Systems 3 and 4 as applicable.
S Y S

C OM P R E S S O R
I S
O N

This message indicates whether the compressor on this
system is ON or OFF.
S Y S
1 3 5

#
MO T O R
A M P S

C U R R E N T
7 8 %
F L A

This message indicates the compressor motor current in
amps and as a percentage of Full Load Amps.
S Y S
S P =

#
O I L =
6 2
D P =

1 7 5
2 7 1

P S I G
P S I G

This message indicates the system oil pressure, suction
pressure, and discharge pressure.

S Y S
S T =

#
O I L =
1 5 4 . 8
3 9 . 0
D T = 1 2 3 . 7

° F
° F

This message shows the system oil temperature, suction
temperature, and discharge temperature.

S #
S A T
S U C T
S U C T
S H E A T

= 3 4 . 7 ° F
= 1 0 . 5 ° F

These messages indicate compressor suction gas saturation temperature and superheat.
S #
S A T
D S C H =
D S C H
S H E A T

1 2 9
° F
= 6 2 . 8 ° F

This message indicates compressor discharge gas saturation temperature and superheat.
S Y S

S V

S T E P

4 0

This message indicated the compressor slide valve position. 0 steps equals minimum capacity and 75 steps
equals fully loaded.

PWM TEMP – EMS PWM Temp. Reset Enabled
CUR/TEMP – EMS PWM Current Limiting &
Temperature Reset Enabled
150

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

S Y S
X
E E V
S U C T
S H E A T

= 3 7 . 4
%
= 1 0 . 2 ° F

This message indicates the EEV preheat % and the suction superheat.
S Y S
#
R U N
T I M E
1 3 - 4 8 - 1 7
D - H - M - S

This message displays the accumulated Run Time since
the last start in Days (D), Hours (H), Minutes (M), and
Seconds (S).
S Y S
#
L L S V
I S
E C O N
T X V
S O L
I S

O N
O N

This message indicates the Liquid Line Solenoid Valve
and the economizer TXV solenoid valve position: ON =
Energized/Open, OFF = De-energized/Closed.
S Y S
#
F A N
S T A G E
C OM P
H E A T E R
I S

3
O N

This message advises the stage of condenser fan operation on this system and the status of the compressor
heater. See Section 8.4 for details of fan staging.
Once the System Data sequence has been repeated for
the second system, pressing the or key again will
loop back to the beginning to the Load/Unload Timer
display. To leave the sequence at any point, press a key
from another section of the keypad.
SOFTWARE VERSION

The software version may be viewed by pressing the
* key.
The software version will be displayed similar to the
sample below:
S O F T WA R E
V E R S I O N
C . A C S . 0 9 . 0 8

4.4

OPERATING DATA –
REMOTE PRINTOUT

The follow text shows a typical example printout
obtained by pressing the Operating Data key with an
optional printer attached. In this case, an example is
shown for a YCAS 2 System Chiller.
YORK INTERNATIONAL CORPORATION
MILLENNIUM SCREW CHILLER
UNIT STATUS
2:04PM 01 JUN 02
SYS 1
SYS 2

NO COOLING LOAD
COMPRESSOR RUNNING
OPTIONS

CHILLED LIQUID
WATER
AMBIENT CONTROL
STANDARD
REFRIGERANT TYPE
R-22
UNIT TYPE
YCAS
MOTOR CURRENT AVERAGING ENABLED
HEAT RECOVERY
DISABLED
PROGRAM VALUES
DSCH PRESS CUTOUT
399 PSIG
DSCH PRESS UNLOAD
375 PSIG
SUCT PRESS CUTOUT
44 PSIG
HIGH AMBIENT CUTOUT
130.0 DEGF
LOW AMBIENT CUTOUT
25.0 DEGF
LEAVING LIQUID CUTOUT 36.0 DEGF
MOTOR CURRENT UNLOAD
100 %FLA
ANTI RECYCLE TIME
600 SECS
LOCAL/REMOTE MODE
REMOTE
LEAD/LAG CONTROL
AUTOMATIC
UNIT DATA
LEAVING LIQUID TEMP
49.0 DEGF
RETURN LIQUID TEMP
58.2 DEGF
SETPOINT
42.0 +/- 2.0 DEGF
REMOTE SETP
42.0 +/- 2.0 DEGF
AMBIENT AIR TEMP
74.8 DEGF
LEAD SYSTEM
SYS 2
EVAPORATOR PUMP
ON
EVAPORATOR HEATER
OFF
ACTIVE REMOTE CONTROL
NONE
SOFTWARE VERSION
C.ACS.09.00
SYSTEM 1 DATA
COMPRESSORS STATUS
OFF
RUN TIME
0- 0- 0- 0 D-H-M-S
MOTOR CURRENT
0 AMPS 0 %FLA
SUCTION PRESSURE
125 PSIG
DISCHARGE PRESSURE
131 PSIG
OIL PRESSURE
130 PSIG
SUCTION TEMPERATURE
68.4 DEGF
DISCHARGE TEMPERATURE 68.8 DEGF
OIL TEMPERATURE
68.8 DEGF
SAT SUCTION TEMP
71.8 DEGF

YORK INTERNATIONAL

151

Micro Panel Contents

FORM 201.19-NM1 (204)

4.5
SUCTION SUPERHEAT
3.4 DEGF
SAT DISCHARGE TEMP
74.5 DEGF
DISCHARGE SUPERHEAT
6.3 DEGF
SLIDE VALVE STEP
0
EEV OUTPUT
0.0 %
EVAPORATOR INLET REFRIG
44.6 DEGF
LIQUID LINE SOLENOID
OFF
ECONOMIZER TXV SOLENOID
OFF
CONDENSER FAN STAGE
OFF
COMPRESSOR HEATER
ON
WYE-DELTA RELAY
OFF
SYSTEM 2 DATA
COMPRESSORS STATUS
ON
RUN TIME
0- 0-15-26 D-H-M-S
MOTOR CURRENT
104 AMPS 87 %FLA
SUCTION PRESSURE
57 PSIG
DISCHARGE PRESSURE
233 PSIG
OIL PRESSURE
218 PSIG
SUCTION TEMPERATURE
42.9 DEGF
DISCHARGE TEMPERATURE 145.5 DEGF
OIL TEMPERATURE
102.8 DEGF
SAT SUCTION TEMP
31.7 DEGF
SUCTION SUPERHEAT
11.2 DEGF
SAT DISCHARGE TEMP
112.1 DEGF
DISCHARGE SUPERHEAT
33.4 DEGF
SLIDE VALVE STEP
70
EEV OUTPUT
35.6 %
EVAPORATOR INLET REFRIG
23.6 DEGF
LIQUID LINE SOLENOID
ON
ECONOMIZER TXV SOLENOID
ON
CONDENSER FAN STAGE
3
COMPRESSOR HEATER
OFF
WYE-DELTA RELAY
ON
DAILY SCHEDULE
S M T W T F S
MON START=00:00AM

*=HOLIDAY
STOP=00:00AM

TUE
WED
THU
FRI
SAT
HOL

STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM

START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM

The System Evaporator Inlet Refrigerant Temperature will be printed if
the unit is in R407C mode.

HISTORY KEY

If a safety shutdown occurs on the chiller, a comprehensive list of operating and programmed settings data
is stored by the microprocessor. The information is
stored at the instant of the fault, regardless of whether
the fault caused a lockout to occur. This information is
not affected by power failures or manual resetting of a
fault lockout.
The microprocessor stores data for up to 6 safety shutdowns. Once this limit is reached, a further shutdown
will cause the oldest set of data to be discarded in favor
of storing the new shutdown data. The Safety Shutdowns
are numbered from 1 to 6 with number 1 always being
the most recent.
If a remote printer is not connected, pressing the History key allows the operator to locally scroll through
information relating to the stored safety shutdowns on
the control panel display.
If a remote printer is connected, pressing the History key
will cause data from the last 6 shutdowns to be transmitted from the microprocessor to the remote printer.
The printout will begin with the most recent fault which
occurred. This does not affect the stored data and as
many prints as desired may be taken. See Section 4.7
for a HISTORY printout sample.
4.6

FAULT HISTORY DATA –
LOCAL DISPLAY MESSAGES

When the History key is pressed, the following message
will appear:
D I S P L A Y
S A F E T Y
S H U T D OWN
N O . 1
( 1
T O
6 )

To select a Safety Shutdown, press the appropriate key
on the numeric key pad, then press Enter. Remember that
the most recent fault information is stored as shutdown
No. 1. After the ENTER Key is pressed, a message indicating the time and date of the Fault Shutdown will
appear:
S H U T D OWN
O C C U R R E D
5 : 5 9 A M
2 9
N O V
0 2

152

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

Repetitively pressing the
Keys allows scrolling
through the information available in the Safety Shutdown buffer. This is divided into Chiller Data and Individual System Data displays as follows:
Chiller Data:
S Y S
S Y S

1
2

N O
F A U L T S
H I G H
M T R
C U R R

This message indicates the fault that caused the shutdown; in this case, a high motor current in System 2
was the cause of the shutdown.
S 1 - 1

C H I L L E D
WA T E R

A M B I E N T
C O N T R O L
L OW
A M B I E N T

This display indicates whether standard or low ambient
operation was selected at the time of the fault.
S 1 - 3

R E F R I G E R A N T
R - 2 2

This message indicates the type of refrigerant that was
programmed at the time of the fault (R-22 or R407C).
S 1 - 4

This message indicates whether electronic or thermostatic expansion valve is selected. (ELECTRONIC
MUST BE SELECTED FOR EEV OPERATION).
(Remote barrel applications are programmed for
thermostatic).
D I S C H A R G E
P R E S S U R E
C U T O U T
=
3 9 5 . 0
P S I G

This message indicates the discharge pressure cut-out
programmed at the time of the fault.
D I S C H A R G E
P R E S S U R E
U N L O A D
=
3 7 5 . 0
P S I G

This display provides the discharge pressure unload
point, programmed at the time of the fault.
S U C T I O N
P R E S S U R E
C U T O U T
=
4 4 . 0
P S I G

This message displays the suction pressure cut-out programmed at the time of the fault.
H I G H
A M B I E N T
T E M P
C U T O U T
=
1 3 0 . 0
° F

This message indicates the High Ambient Temperature
Cutout at the time of the fault.

YCAS

This message indicates the type of Chiller (YCAS or
YCWS) programmed at the time of the fault. (MUST
BE IN YCAS MODE)
S 1 - 5
MO T O R
C U R R E N T
A V E R A G I N G
D I S A B L E D

This message indicates whether motor current averaging
at start-up is enabled or disabled.
S 1 - 6

E X P A N S I O N
V A L V E
E L E C T R O N I C

L I Q U I D

This message displays the type of chilled liquid selected
(water or glycol) at the time of the fault.
S 1 - 2

S 1 - 7

H E A T
R E C O V E R Y
D I S A B L E D

This message indicates whether heat recovery is disabled or enabled. (HEAT RECOVERY MUST BE
DISABLED)

YORK INTERNATIONAL

L OW
A M B I E N T
T E M P
C U T O U T
=
2 5 . 0 ° F

This display shows the Low Ambient Cutout programmed at the time of the fault.
L E A V I N G
L I Q U I D
T E M P
C U T O U T
=
3 6 . 0 ° F

This display shows the Low Leaving Chilled Liquid
Cutout programmed at the time of the fault.
H I G H
MO T O R
C U R R E N T
U N L O A D
1 0 0 %
F L A

This message shows the programmed %FLA Motor
Current Unload at the time of the fault.

153

Micro Panel Contents

L O C A L / R E MO T E
L O C A L

FORM 201.19-NM1 (204)

MO D E

E V A P
E V A P

This message shows whether remote or local communications was selected at the time of the fault.
L E A D / L A G
C O N T R O L
A U T OM A T I C

=
=

4 4 . 1
5 2 . 9

° F
° F

This message indicates the leaving and return chilled
liquid temperature at the time of the fault.
M C H L T

4 3 . 8

° F

This message indicates the mixed water temperature
at the time of the fault. A mixed water sensor may be
present when multi-unit sequencing is utilized. If no
mixed water temperature sensor is installed, the display
will not appear.
S E T P O I N T
R A N G E
=

=
4 4 . 0 ° F
+ / 2 . 0 ° F

This message displays the programmed chilled liquid
setpoint and deviation (control range) programmed at
the time of the fault.
A M B I E N T
A I R
7 7 . 6 ° F

T E M P

This message indicates the outdoor Ambient Air Temperature at the time of the fault.
L E A D
S Y S T E M
I S
S Y S T E M
N U M B E R

O N
O F F

This message indicates the status of both the evaporator
pump signal from the microprocessor and the evaporator heater.
A C T I V E

This message displays the lead/lag selection programmed at the time of the fault.
L C H L T
R C H L T

P U M P
I S
H E A T E R
I S

R E MO T E
N O N E

C T R L

This message indicates that a remote device such as a
Remote Control Center, an ISN controller, or another device is sending a PWM signal for temperature or current
reset is overriding control points programmed through
the keypad or default microprocessor setpoints.
System Data:
Following the Common Data is a sequence of twenty
information displays which are given twice, first for
System 1, then for System 2. In each example, “#” is
used to indicate System number:
S Y S

C OM P R E S S O R
I S
O N

This message indicates whether the compressor on this
system was ON or OFF at the time of the fault.
S Y S
#
R U N
T I M E
1 - 3 - 4 8 - 1 7
D - H - M - S

This message shows the Run Time logged on the system
since the last compressor start, in Days (D), Hours (H),
Minutes (M), and Seconds (S).
S Y S
1 3 5

#
MO T O R
A M P S

C U R R E N T
7 8 %
F L A

This message indicates the compressor motor current in
amps and as a percentage of Full Load Amps.

This message indicates which system was in the lead at
the time of the fault.

154

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

S Y S
S P =

#
O I L =
6 2
D P =

1 7 5
2 7 1

P S I G
P S I G

This message indicates the system oil pressure, suction pressure, and discharge pressure at the time of the
fault.
S Y S
S T =

#
O I L =
1 5 4 . 8
3 9 . 0
D T = 1 2 3 . 7

° F
° F

This message shows the system oil temperature, suction
temperature, and discharge temperature at the time of
the fault.
S #
S A T
S U C T
S U C T
S H E A T

= 3 4 . 7 ° F
= 1 0 . 5 ° F

These messages indicate compressor suction gas saturation temperature and superheat at the time of the
fault.
S #
S A T
D S C H =
D S C H
S H E A T

1 2 9
° F
= 6 2 . 8 ° F

This message indicates compressor discharge gas saturation temperature and superheat at the time of the
fault.
S Y S

S V

S T E P

4 0

S Y S
#
L L S V
I S
E C O N
T X V
S O L
I S

O N
O F F

This message indicates the EEV PILOT Solenoid Valve
and the economizer Thermal Expansion Valve Solenoid
Valve position: ON = Energized / OFF = De-Energized
(OFF) at the time of the fault.
S Y S
#
F A N
S T A G E
C OM P
H E A T E R
I S

3
O F F

This message indicates the stage of condenser fan operation on the system and the status of the compressor
heater at the time of the fault. See Section 8.4 for details
of fan staging.
S Y S

WYE - DELTA

This message indicate whether the WYE-DELTA output to the compressor was energized at the time of the
fault
SYS
SYS

X
X

DSCH
CL SV
WYE-DELTA

OFF
OFF

This message indicates whether the discharge cooling
solenoid was energized at the time of the fault and if the
WYE-DELTA output to the compressor was energized.
(Low Temperature Glycol Chillers Only)

This message indicates the compressor slide valve position at the time of the fault. 0 steps equals minimum
capacity and 75 steps equals fully loaded.
SYS X E E V
SUCT SHEAT

=
=

37.4
10.2

%
ºF

This message indicates the EEV preheat % and the suction superheat.
S Y S
#
C O O L E R
I N L E T
R E F R I G
T E M P
=
2 8 . 2 ° F

This message, which is only displayed if the unit is in
R-407C mode, indicates the refrigerant temperature at
the inlet of the evaporator.

YORK INTERNATIONAL

155

Micro Panel Contents
4.7

FORM 201.19-NM1 (204)

FAULT HISTORY DATA –
REMOTE PRINTOUT

A printout history of unit and system operating conditions, at the time of the fault, can be obtained by pressing
the HISTORY Key with an optional printer installed. 2
compressor chillers will provide a history printout on
the last 6 faults.
An example of the HISTORY Printout is shown below:

OIL TEMPERATURE
68.8 DEGF
SAT SUCTION TEMP
71.8 DEGF
SUCTION SUPERHEAT
3.4 DEGF
SAT DISCHARGE TEMP
74.5 DEGF
DISCHARGE SUPERHEAT
6.3 DEGF
SLIDE VALVE STEP
0
EEV OUTPUT
0.0 %
EVAPORATOR INLET REFRIG
44.6 DEGF
LIQUID LINE SOLENOID
OFF
ECONOMIZER TXV SOLENOID
OFF
CONDENSER FAN STAGE
OFF
COMPRESSOR HEATER
ON
WYE-DELTA RELAY
OFF

YORK INTERNATIONAL CORPORATION
MILLENNIUM SCREW CHILLER
SAFETY SHUTDOWN NUMBER 1
SHUTDOWN @ 3:56PM 29 SEP 02
SYS 1
SYS 2

HIGH DSCH PRESS SHUTDOWN
NO FAULTS
OPTIONS

SYSTEM 2 DATA
COMPRESSORS STATUS
ON
RUN TIME
0- 0-15-26 D-H-M-S
MOTOR CURRENT
104 AMPS 87 %FLA
SUCTION PRESSURE
57 PSIG
DISCHARGE PRESSURE
233 PSIG
OIL PRESSURE
218 PSIG
SUCTION TEMPERATURE
42.9 DEGF
DISCHARGE TEMPERATURE 145.5 DEGF
OIL TEMPERATURE
102.8 DEGF
SAT SUCTION TEMP
31.7 DEGF
SUCTION SUPERHEAT
11.2 DEGF
SAT DISCHARGE TEMP
112.1 DEGF
DISCHARGE SUPERHEAT
33.4 DEGF
SLIDE VALVE STEP
70
EEV OUTPUT
35.6 %
EVAPORATOR INLET REFRIG
23.6 DEGF
LIQUID LINE SOLENOID
ON
ECONOMIZER TXV SOLENOID
ON
CONDENSER FAN STAGE
3
COMPRESSOR HEATER
WYE-DELTA RELAY

OFF
ON

DAILY SCHEDULE
S M T W T F S
MON
TUE
WED
THU
FRI
SAT
HOL

START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM

*=HOLIDAY
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM

SYSTEM 1 DATA
COMPRESSORS STATUS
OFF
RUN TIME
0- 0- 0- 0 D-H-M-S
MOTOR CURRENT
0 AMPS 0 %FLA
SUCTION PRESSURE
125 PSIG
DISCHARGE PRESSURE
131 PSIG
OIL PRESSURE
130 PSIG
SUCTION TEMPERATURE
68.4 DEGF
DISCHARGE TEMPERATURE 68.8 DEGF

156

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

5. ENTRY KEYS

29023A

5.1

GENERAL

The Entry keys allow the user to change numerical
values programmed in as chiller setpoints, cutouts,
clock, etc.
5.2

NUMERICAL KEYPAD

The Numerical keypad provides all keys necessary to
program numerical values into the Micro Panel.
The “*” key is used to designate holidays when programming special start/stop times for designated holidays in
the SET SCHEDULE/HOLIDAY program mode.
The “+/-” key allows programming -C setpoints and
cut-outs in the metric display mode.
5.3

ENTER KEY

The Enter key must be pushed after any change is made
to setpoints, cutouts, or system clock. Pressing this key
tells the micro to accept new values into memory. If this
is not done, the new values entered will be lost and the
original values will be returned.

YORK INTERNATIONAL

The Enter key is also used to scroll through available
data when using the Program or Set Schedule/Holiday
keys.
5.4

CANCEL KEY

When the Cancel key is pressed, the cursor will always
return to the first character to be programmed in the
display message. This allows the operator to begin reprogramming, if an error is made. When the Cancel key
is pressed, the values already keyed in will be erased
and the original or internally programmed default values
will appear. In other instances the display will remain the
same and the only reaction will be the cursor returning
to the first character.
5.5

KEYS

The
keys allow the user to scroll through data under
the OPER DATA and HISTORY Key and to select the
correct day of the week and the correct month when
programming the micro with the correct time and date.
The key also operates as a toggle AM/PM key if the
cursor is over “AM” or “PM” on the display. For example, pressing the key when the cursor is on “PM”
changes it to “AM.”

157

Micro Panel Contents

FORM 201.19-NM1 (204)

6. SETPOINTS KEYS & CHILLED LIQUID CONTROL

29023A

6.1

GENERAL

The microprocessor monitors leaving chilled liquid
temperature and adjusts the chiller cooling capacity to
maintain this temperature within a programmed range.
The capacity is controlled by switching compressors
on or off, and by varying a load/unload voltage to
each compressor slide valve to adjust the capacity of
the compressors. The microprocessor controls chilled
liquid temperature through a combination of Fuzzy
Logic control and internal timers. Fuzzy logic enables
the micro to analyze the deviation from setpoint and
the rate of change and determine the amount of loading
and unloading necessary to control to the desired chilled
liquid setpoint temperature. The micro also attempts to
maximize efficiency by spreading the cooling load between compressors, minimize compressor cycling, and
optimally utilize evaporator tube surface (maximize
efficiency). This method of control is suitable for both
water and glycol cooling. A control setpoints can be programmed into the chiller to establish the desired range
of leaving chilled liquid operating temperatures. A description of the operation and programming follows.
6.2

CHILLED LIQUID TEMPERATURE
CONTROL

The Setpoints keys are used to program the required
chilled water liquid temperature for the application.
This is accomplished by programming the “Setpoint”
and the acceptable deviation (+ or - Range) This deviation is simply called the “Control Range” and is best
158

described as the maximum acceptable + and - deviation
from Setpoint.
The minimum acceptable temperature is the Lower
Range Limit and is calculated by subtracting the “-”
Range from the Setpoint. The Lower Range Limit is
the lowest acceptable leaving temperature. The highest
acceptable temperature is referred to as the Upper Range
Limit and is calculated by adding the “+” Range to the
Setpoint. The Upper Range Limit is the highest acceptable leaving temperature. For example, if the desired
Setpoint temperature is 44.0°F (7°C) and the allowable
deviation (+ / - Range) from this temperature is +/- 2.0°F
(1°C), then the micro will attempt to control leaving
chilled liquid temperatures to 42.0°F (6°C) to 46.0°F
(8°C). This can be viewed pictorially as follows:
46.0°F
(8°C)
44.0°F
(7°C)

SETPOINT
Temp.

CONTROL
RANGE

(User acceptable
leaving
chilled liquid operating range)

42.0°F
(6°C)

To assure that the chilled liquid leaving temperature
stays within the Control Range, the micro will attempt
to control the leaving temperature to the actual Setpoint
temperature. This is accomplished by analyzing the temperature error and the rate of change to determine the
amount of loading necessary to cool the chilled liquid
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

to the Setpoint Temperature. The amount of loading is
varied by changing the amount of DC Voltage signal to
the slide valve solenoid of each compressor. Voltage
increases with load (0 - approximately 9VDC at full
load).
Slide Valve Control
The slide valve of each compressor can be moved 75
steps, where “0” equals minimum capacity and fully
loaded equals 75 steps. The amount of movement that
occurs when the micro initiates changes may vary according to the error or deviation from setpoint and the
rate of change of chilled liquid temperature. Each time a
change is made, the incremental change may vary from
1 to 10 steps as determined from the micro. In cases
where internal limiting is not in effect due to possible
fault conditions, the micro will load the compressor with
the lowest number of steps, alternating loading back and
forth between compressors until both are fully loaded.
In some cases the micro will be required to make decisions regarding loading under conditions where the
temperature “error” and temperature “rate” conflict. For
example, the micro may elect to unload a compressor
if the error is “0” (temperature is at setpoint), while the
rate of change of chilled liquid temperature is negative
(falling). The micro may also elect to hold capacity when
error is “+” (temperature is above setpoint) because the
rate of change of chilled liquid is “-”. Below is a chart
which illustrates these conditions.
ERROR
Negative

Zero

Positive

Negative

Unload

Hold

Zero

Unload

Hold

Load

Positive

Hold

Load

RATE

Load Timers
Fixed timers are set to minimize undershoot and overshoot as a result of slide valve control.
•
•

Load Timers are always set at 10 seconds between
changes.
Unload Timers are set at 5 seconds between changes.

YORK INTERNATIONAL

Slide Valve Position
A slide valve position (S V STEP), under the keypad
system keys, of 75 indicates that the compressor is fully
loaded. However due to the non-exact movement of
the mechanism, a position less than 75, possibly 60,
could also mean that the compressor is fully loaded.
A compressor may also be fully unloaded at step 35
and below. Keep this potential indicator error in mind
when attempting to determine slide valve position versus
actual compressor capacity.
Compressor Starting & Loading Sequence
If no compressors are running, the Daily Schedule
permits, all safeties and run permissives are satisfied,
the anti-recycle timers have timed out, and the leaving
liquid temperature rises above the upper range limit of
the Control Range, the lead compressor will be started.
A 0VDC signal is sent to the compressor slide valve
control solenoid to allow the internal spring to push the
slide valve to a minimum loading position to assure it is
fully unloaded at start. At the same time, the micro will
energize (open) the pilot solenoid on the EEV. After
an initial period of 15 seconds, the micro will begin to
load up the lead compressor to bring the chilled liquid
temperature to setpoint.
After 5 minutes of run time, if leaving chilled liquid
temperature is not within the Control Range, the micro
will start the lag compressor. This is not dependent on
slide valve position which after 5 minutes will typically be fully loaded at a S V Step of “75”. The lead
compressor will be reduced in capacity to a slide valve
step of 40. The lag compressor will then be loaded until
it also reaches a slide valve step of 40 while the lead
compressor is maintained at a constant load. At this
point the compressors will be alternately loaded with
loading always occurring on the compressor with the
lowest slide valve step until the leaving chilled liquid
is satisfied.
Compressor Loading
The micro loads and unloads individual compressors
by varying voltage to the Slide Valve solenoid which
controls oil flow to the slide valve. The slide valve load
solenoid applies oil pressure to the slide valve to overcome spring pressure from an internal spring, increasing
capacity. The internal spring moves the slide valve in
the opposite direction against oil pressure to decrease
capacity.

159

Micro Panel Contents
Whenever chilled liquid leaving temperature is above
the Setpoint plus the control range, loading voltage will
increase to allow oil pressure to push against the internal
slide valve return spring and move the slide valve to
increase capacity. Every 10 seconds, when the load timer
decrements to 0, the micro will increment the slide valve
step from 1 to 10 steps according to error (deviation from
setpoint) and rate of change of chilled liquid.
The micro will always choose the compressor with the
lowest slide valve position to load on increasing demand,
provided the compressor is not pumping down, has run at
least 15 seconds, and is not in a “Limiting” condition.
Compressor Unloading and Shutdown Sequence
Whenever temperature is below the Setpoint, minus the
control range, the voltage to the slide valve solenoid
will decrease, which bypasses oil pressure to the slide
valve allowing the slide valve return spring to move the
slide valve forward to the fully unloaded position on the
compressor with highest slide valve step. Every 5 seconds, the micro will decrement the compressor with the
highest slide valve position by 1 - 10 steps according to
the error (deviation from Setpoint) and the rate of change
of chilled liquid temperature until the temperature falls
within the control range.
As load drops, the micro will continue to unload the
compressor with the highest slide valve step until all
compressor slide valves are at “0.” At this point, the
last lag compressor will pump down and cycle off, if
chilled liquid temperature drops below “Setpoint - Control Range/2”. When the lag compressor cycles off,
the lead compressor slide valve will increment to step
30. As load continues to decrease, the lead compressor
will continue to unload to a slide valve position of “0”
and will pump down and cycle off if the chilled liquid
temperature drops below “Setpoint – Control Range.”

The lag compressor may be shut down
before it is fully unloaded to avoid a
Chiller fault on a Low Water Temperature cut-out under the following
conditions: a) if chilled liquid temperature falls below the low end of the
Control Range (CR) for more than 37
seconds, b) if chilled liquid temperature drops more than CR/4 below the
low limit of the Control Range.

160

FORM 201.19-NM1 (204)

The lead compressor may be shut down
before it is fully unloaded to avoid a
Chiller Fault on Low Water Temperature under the following conditions:
a) if chilled liquid temperature drops
2°F below the low limit of the Control
Range (CR), b) if chilled liquid temperature drops more than CR/2 below
the low limit of the Control Range.
ANTICIPATORY LOAD LIMITING CONTROLS

The purpose of the Anticipatory Load Limiting controls
is to prevent the system from ever reaching a point where
the micro would be forced to unload a system to prevent
the system from reaching a safety threshold. This in
turn prevents cycling of the slide valve as the micro
would load and unload the system as system operating
pressures and temperatures move above and below the
forced unload point.
Anticipatory load limiting controls monitor motor current, discharge pressure, and saturated suction temperature. When the system is called to load in an attempt
to satisfy chilled liquid temperature, the micro looks at
these three operating parameters and determines if any
are nearing the user programmed or internal microprocessor unload threshold points programmed into the
micro panel. If the micro determines that the unload
points could be exceeded, it limits the steps of loading
or may decide not to provide any further loading of the
specific system, even though there is a need for additional cooling. No status display will be present when
anticipatory load limiting occurs.
In the case of both Motor Current and Discharge Pressure, the micro limits loading as follows based on the
programmed unload point. These thresholds are outlined in the following table:
Percentage of Motor
Current or Discharge
Pressure Unload Point

Maximum Steps of
Loading After Load
Timer Counts to "0"

> 70 %

> 80 %

> 90 %

> 95 %

In the case of Saturated suction temperature, the micro
limits loading based on saturated suction temperature
dropping toward the point of unloading. In the water
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FORM 201.19-NM1 (204)

cooling mode, the saturated suction temperature unload
point is 24ºF (-4.42ºC). In glycol cooling mode, the
control is inactive. The load limiting thresholds are
shown in the following table:

mode, the saturated suction temperature unload point is
equal to the leaving chilled liquid setpoint -11ºF (6.1ºC).
The unload limiting thresholds are shown in the table
below:

Temperature Difference
Between Saturated Suction Temperature and the
Unload Temperature

Maximum Steps of
Loading After Load
Timer Counts to "0"

Temperature Difference
Between Saturated Suction Temperature and the
Unload Temperature

Maximum Steps of
Unloading After Load
Timer Counts to "0"

< 7.0

< 0.0

< 4.5

< -0.5

< 2.5

< -1.0

< -1.5

< -2.0

< -3.5

< 1.0

ANTICIPATORY UNLOADING CONTROLS

The purpose of these controls is to prevent the system
from ever reaching a point where pressure or temperature safety threshold would be exceeded shutting down
a system. This is accomplished by forcibly unloading
the compressor.
Anticipatory unloading controls monitor motor current,
discharge pressure, and saturated suction temperature
every 2 seconds and compare the values with the user
or internally programmed unload points. When the
system exceeds the unload point, the micro unloads
the compressor based upon the difference between the
actual pressure/temperature and the unload point. This
action is taken even through there may be a need for
additional cooling.
In the case of both the Motor Current and Discharge
Pressure, the micro unloads the compressor as follows
based on the user programmed unload threshold. The
amount of unloading based upon the deviation versus
the number of steps of unloading which will take place
is outlined in the following table:
Percentage of Motor
Current or Discharge
Pressure Unload Point

Maximum Steps of
Unloading After Load
Timer Counts to "0"

> 100 %

> 102 %

> 104 %

> 106%

> 108 %

> 115 %

In the case of Saturated suction temperature, the unloading is based on saturated suction temperature dropping
below the internally programmed unload threshold. In
the water cooling mode, the saturated suction temperature unload point is 24ºF (-4.42ºC) In the glycol cooling
YORK INTERNATIONAL

Whenever these controls are active, a STATUS Message
will appear on the display indicating the condition. See
displays below:
S Y S
S Y S

#
#

D S C H
D S C H

L I M I T I N G
L I M I T I N G

S Y S
S Y S

#
#

C U R R
C U R R

L I M I T I N G
L I M I T I N G

S Y S
S Y S

#
#

S U C T
S U C T

L I M I T I N G
L I M I T I N G

DISCHARGE TEMPERATURE ANTICIPATORY
SHUTDOWN CONTROL

If the discharge temperature nears the safety shutdown
point, the micro may turn off the compressor to avoid a
high discharge temperature fault.
If the discharge temperature rises above 255ºF (123ºC),
the micro will pump down the compressor and shut it off.
The micro will not allow the affected system to restart
for a period of 15 minutes. A message indicating the
compressor start inhibit will be displayed. An example
of the display is shown below:
S Y S
S Y S

#
#

D S C H
D S C H

/ O I L
/ O I L

I N H I B
I N H I B

OIL TEMPERATURE ANTICIPATORY SHUTDOWN
CONTROL

If the oil temperature nears the safety shutdown point,
the micro may turn off the compressor to avoid a high
oil temperature fault.

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Micro Panel Contents

FORM 201.19-NM1 (204)

If the oil temperature rises above 220ºF (104ºC) and
SV position is <60 steps, the micro will pump down the
compressor and shut it off. The micro will not allow the
effected system to restart for a period of 15 minutes. A
message indicating the compressor start inhibit will be
displayed An example of the display is shown below.
S Y S
S Y S

6.3

#
#

D S C H
D S C H

/ O I L
/ O I L

I N H I B
I N H I B

LOCAL COOLING SETPOINTS KEY

The Local Cooling Setpoints key is used to program the
required Leaving Chilled Liquid control temperatures
for the application. When the key is pressed, the following message will be displayed:
S E T P O I N T
R A N G E
=

=
4 4 . 0
+ / 2 . 0

° F
° F

Key in the desired Chilled Liquid Setpoint and the
allowable deviation (Range). The micro will accept
values from 10.0 - 70.0°F (-12 to 21°C). For values
below 40°F (4.4°C), Dip Switch S1, Switch #1 on the
Microprocessor Board must be properly programmed
for Glycol Cooling (see Section 3.7). If unacceptable
values are entered, or the switch is incorrectly selected
when setpoints below 40°F (4.4°C) are entered, the following message will be displayed before returning to
the Control Range message:
O U T
T R Y

O F
R A N G E A G A I N !

After the Setpoint is keyed in, the cursor will automatically advance to the first digit of the Range as shown:
S E T P O I N T
R A N G E
=

=
4 4 . 0
+ / 2 . 0

° F
° F

This value should be programmed for the maximum desirable positive and negative chilled liquid temperature
deviation that is acceptable from setpoint for the system
application. A typical value would be +/- 2.0°F (1.1°C).
The micro will accept a range from 1.5 - 2.5°F (0.9 to
1.4°C).
After the Setpoint and Range is keyed in, press the
ENTER Key to store the data in memory.

After pressing the Enter key, the display will continue
to show the message until another key is pressed.
6.4

REMOTE COOLING SETPOINTS KEY

Remote Cooling Setpoints key allows resetting the setpoint upward from the programmed value in memory
from a remote device. This feature is typically used for
demand limiting or ice storage applications. Reset is
accomplished by timed closure of external contacts for
a defined period of time and allows reset of the setpoint
upward by up to 40°F (22°C) above the setpoint programmed in memory – see Section 1.7.
The maximum allowable reset must be programmed into
memory and can be a value of 2 to 40°F (1 to 22°C) depending on user requirements. To program the maximum
reset, press the Remote Reset Temperature Range key.
The following message will appear:
R E M
S E T P
R A N G E
=

=
4 4 . 0
+ / 2 . 0

° F
° F

The display indicates the Remote Setpoint which is
always equal to the chilled liquid setpoint programmed
by the Chilled Liquid Temperature/Range key plus the
offset from the remote reset signal. The display will also
show the Range which is the programmed maximum deviation allowed for the application. The RANGE display
is not programmable, and only the setpoint will change
as a result of a signal from a remote device.
M A X
E M S - PWM
R E MO T E
T E M P
R E S E T
=
+ 4 0 ° F

Pressing the REM RESET TEMP RANGE Key again
scrolls the display to the MAX EMS-PWM REMOTE
TEMP RESET which is programmable. This should be
programmed to the maximum offset which is required
for the application. The maximum programmable value
is 40° F (22°C), while the minimum programmable value
is 2°F (1.1°C).
The cursor will stop beneath the first digit of the maximum reset. Key in the maximum reset allowed for the
application, remembering to use a leading “0” for values
less than 10°F (or 10°C). Press the ENTER Key to store
the new value in memory.

Failure to press the Enter key will
cause the newly programmed values
to be ignored and not entered into
memory.
162

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FORM 201.19-NM1 (204)

7. CLOCK KEYS

29023A

7.1

GENERAL

The microprocessor features a continuously running internal Clock and calendar and can display actual time as
well as the day of the week and the date. An automatic
schedule feature is provided for starting and stopping
the chiller on individual days of the week, eliminating
the need for an external time clock. Also provided are
a Holiday feature, allowing special start/stop times to
be set for designated holidays, and a Manual Override
feature to aid servicing. If the automatic schedule feature
is not required, the micro can be programmed to run the
chiller on demand as long as the Chiller ON/OFF and
System switches are in the ON position.
Programming of the internal clock/calendar and operating schedule are described below.
7.2

SET TIME KEY

When the Set Time key is pressed, a message showing
the day, time and date will be displayed with the cursor
below the first digit of the time as shown:
T O D A Y

I S
MO N
1 1 . 1 2 A M
1 9
F E B
2 0 0 3

First press the or key until the proper day appears.
Press ENTER to move on to the hour part of the display.
Next, key in the time (hours/minutes) using a leading

YORK INTERNATIONAL

“0” for times before 10 o’clock. e.g. 08:31. The cursor
will then advance to the AM/PM designation. If necessary press the
or
key to change to the opposite
time period.
Next, key in the day of the month (the cursor will automatically skip from AM/PM to the first digit of the
date when a “number key” is pressed). The cursor will
then skip to the first digit of the year. Key in the year.
Always use two digits for the day and the year, using a
leading “0” for days 1-9 e.g. 02 FEB 03. Finally, change
the month as needed by repetitively pressing the or
key until the proper month appears. Once the desired
information is keyed in, it must be stored into memory
by pressing the Enter key.
Any valid time or date will be accepted. If an out of
range value is entered, the following message will be
displayed for 3 seconds then revert back to the Set Time
display message for reprogramming:
O U T
T R Y

O F
R A N G E A G A I N !

Pressing the Set Time key once, enters
the “programming” mode in which
the displayed time does not update.
Pressing the Set Time key a second
time enters “display” mode in which
the cursor will disappear and the “live”
clock will be displayed.
163

Micro Panel Contents
7.3

FORM 201.19-NM1 (204)

Programming the DAILY SCHEDULE
will not affect the holiday schedule.

SET SCHEDULE / HOLIDAY KEY

Messages showing each week day and the holiday
start/stop schedule, as shown below, can be displayed
using the Set Schedule / Holiday key:
MO N

S T A R T
S T O P

=
=

0 6 : 0 0
0 5 : 3 0

A M
P M

The displays for each day are scrolled through by repetitively pressing the set Schedule/Holiday key. To reprogram any of the daily schedules, key in the new Start
time then, if necessary, change the associated AM/PM
by pressing the or key.

The
or
key can only be pressed
once to change AM/PM. If an error is
made, press Cancel and begin again.

Next key in the Stop Time (the cursor will automatically
skip from AM/PM to the first digit of the stop time when
a “number key” is pressed) and the AM/PM if necessary.
Now press the ENTER key to store the new schedule.
The display will scroll to the next day. If an unacceptable
time is entered, the following message will be displayed
for 3 seconds then return to the schedule display:
O U T
T R Y

O F
R A N G E
A G A I N !

New start/stop times programmed for
Monday are automatically used for all
of the following days of the week.
Always use the Set Schedule/Holiday
key, not the Enter key to scroll through
the schedule displays. Pressing the
ENTER key after viewing Monday
will change times programmed for the
remainder of the week to the Monday
schedule.
If the chiller is not cycled by the Daily Schedule, but is
required to run whenever remote cycling devices, system
switches, and main Chiller ON/OFF switch are in the
ON position, all 00.00s should be programmed into the
daily schedule. This can be done manually for individual
days or for all days by pressing Cancel and Enter for the
Monday Start/Stop schedule.
164

If the chiller is not required to run on a given day, the
Start time should be programmed for 00:00 AM and the
Stop time programmed for 12:00 AM.
Continue to program each day as needed. After SUN has
been entered, the Holiday message will be displayed:
H O L

S T A R T
S T O P

=
=

0 8 : 3 0
1 2 : 0 0

A M
P M

The Holiday (HOL) Start / Stop allows a specific day(s)
to be assigned for special requirements. This is provided
so that a day(s) needing special start / stop requirements
can be programmed without disturbing the normal working schedule. The start / stop times for the Holiday schedule are programmed just as any other day.

Only one start/stop time can be programmed which will apply to each of
the Holiday days selected.

After the Enter key is pressed, a display to designate
which days of the week are holidays will appear:
S
* M
T
W
T
F
H O L I D A Y
N O T E D
B Y

When the display appears, the cursor will first stop after Sunday as shown. To designate a day as a holiday,
press the “ * ” key. If a day marked as a holiday is not
to be a holiday, press the “ * ” key. When the “ * ” key
is pressed, the cursor will advance to the next day. Use
the or keys to move back and forth among days.
After all the holiday days are programmed, press Enter
to store the new data. The display will then return to the
beginning of the Daily Schedule (MON).

The Holiday Schedule is only executed
once, then erased from memory. This
avoids the need for reprogramming
after the holiday, as most special Holiday Schedule requirements occur only
occasionally.

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FORM 201.19-NM1 (204)

If an error is made while programming or a change is
required, press Cancel. This will clear the programmed
(*) “Holiday” days (the “0” key will not cancel out a
“ * ” and cannot be used for correcting a programming
error).
7.4 MANUAL OVERRIDE KEY

When the Manual Override key is pressed, the Daily
Schedule programmed into the chiller is ignored and
the chiller will start up when water temperature is above
the high limit of the Control Range, the Chiller ON/OFF
switch is ON, remote cycling devices are CLOSED, and
system switches permit.
Normally this key is only used for servicing when the
chiller is required to run, but the Daily Schedule is in
an OFF period. This key avoids the need to reprogram
the Daily Schedule. Once activated, Manual Override is
only active for a period of 30 minutes and the following
status message will be observed:

If a Warning – Low Battery fault
message appears on the display, the
in ter nal clock, cal en dar, and program settings cannot be relied on for
accuracy. Default values are loaded
into the microprocessor memory and
the Manual Override key can be used
to zero out the daily schedule and allow unlimited operation regardless of
the time on the internal clock. Reprogramming of the setpoints and cutout
values may also be necessary. When the
MANUAL OVERRIDE key is pressed,
the low battery message will disappear.
If a power failure should again occur,
the above process will again need to be
repeated to bring the chiller back on
line. See also Section 2.5.

M A N U A L
O V E R R I D E

YORK INTERNATIONAL

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Micro Panel Contents

FORM 201.19-NM1 (204)

8. PROGRAM KEY

29023A

8.1

GENERAL

The Program key is used to program system operating
parameters including cutout points for safeties, anticipatory unload points to avoid faults, and anti-recycle
timer duration.
When the Program key is pressed, the following message will be displayed to indicate the display is in the
Program Mode:
P R O G R A M

MO D E

Pressing the ENTER Key causes the display to show
the operator the language the control panel messages
are displayed.
D I S P L A Y
L A N G U A G E
E N G L I S H

The operator may select 7 display message languages.
The options are English, Spanish, French, Dutch, Italian,
Portuguese, and Chinese. The or keys can be used
to select the desired language.
Pressing the Enter key repeatedly allows scrolling
through the programmable displays.
As each value is displayed, it may be reprogrammed
using the 12 Entry keys and
Keys. New values
will be programmed into memory when the Enter key
is pressed and the display will scroll on to the next programmable value.
166

If an unacceptable value is entered at any stage, the following message is displayed for a few seconds and the
entered value is ignored:
O U T
T R Y

O F
R A N G E
A G A I N !

The following section shows examples of each programmable value display in the order in which they appear
after pressing the Program key, along with guidance on
programming each parameter.

The programmable values under the
Program Key must be checked and properly programmed when commissioning
the chiller. Failure to properly program
these values may cause operating problems or damage to the chiller.
8.2 PROGRAM KEY –
USER PROGRAMMABLE VALUES

High Discharge Pressure Cut-Out
D I S C H A R G E
P R E S S U R E
C U T O U T
=
3 9 5 . 0
P S I G

The Discharge Pressure Cutout is a microprocessor
backup for the mechanical high pressure cutout located
in each refrigerant circuit. This safety is bypassed for the
first 5 seconds of operation after which if the cutout point
is exceeded for 3 seconds, the system will shut down.
Normally, air-cooled chillers, such as YCAS chillers,
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

should have the cutout set at 395 PSIG (27 bar) for R22
and R407C models. The micro will, however, accept
values between 200 - 399 PSIG (14 - 28 bar).
To program the Discharge Pressure Cutout, key in the
desired value and press the Enter key to store the value
into memory and scroll to the next display.
High Discharge Pressure Unload Point
D I S C H A R G E
P R E S S U R E
U N L O A D
=
3 6 0 . 0
P S I G

The Discharge Pressure Unload point is used to avoid
a high pressure cutout shutdown by unloading a compressor, if its discharge pressure approaches the cutout
value. The chiller can then continue to run automatically
at reduced capacity until the cause of the excessive pressure is attended to (e.g. dirty condenser coils) or ceases
naturally (e.g. high ambient temperature).
For the first 60 seconds of operation, discharge pressure limiting is disabled. After this time, if discharge
pressure exceeds the programmed limit, unloading of
the affected compressor will occur until the discharge
pressure drops below the programmed limit. The message will be removed and reloading will take place
when discharge pressure has dropped to 90% of the
programmed unload point..
Typically the unload point should be set 20 - 25 PSIG
(1.4 - 1.7 bar) below the below the discharge pressure
cutout setting. The micro will accept a range of programmable values between 200 - 399 PSIG (14 - 28 bar).
To program the Discharge Pressure Unload, key in the
required setting and press the Enter key to store the value
into memory and scroll to the next display.
Low Suction Pressure Cutout
S U C T I O N
P R E S S U R E
C U T O U T
=
4 4 . 0
P S I G

The Low Suction Pressure Cutout protects the evaporator from damage due to ice build up caused by operation at low refrigerant suction pressure.

YORK INTERNATIONAL

After the compressor starts, and the pump down cycle is
completed (pump down to cutout or 30 seconds, whichever comes first.), suction pressure is monitored as long
as the compressor runs. For the first 270 seconds of running, suction pressure can be lower than the programmed
cutout, but must be greater than:
Programmed
Cutout

Run Time/3 + 10
100

Example: If programmed Cutout = 44 PSIG (3 bar)
and Run Time = 60 seconds
New Cutout = 44 X

60/3 + 10
= 13.2 PSIG (0.9 bar)
100

This cutout value increases with time, until after 270 seconds, it equals the programmed cutout value. If suction
pressure falls below the calculated cutout value before
270 seconds, the system will be shut down.
After 270 seconds, a transient timer prevents short term
fluctuations in suction pressure from causing shutdown
as follows: If suction pressure drops below the cutout
point, a 90 second transient timer starts. During the 90
second time period, the suction pressure must be greater
than:
Programmed X 100 - transient time remaining
Cutout
100
Example:

If programmed Cutout = 44 PSIG (3 bar)
and the timer has run 30 seconds:

New Cutout = 44 PSIG X 100-60 = 17.6 PSIG (1.2 bar)
100

This cutout value increases with time, until after 90
seconds, it equals the programmed cutout value. If the
suction pressure rises to more than 5 PSI (0.3 bar) above
the programmed cutout value during the 90 second time
period, the timer will be reset. If the suction pressure
does not rise to more than 5 PSI (0.3 bar) above the
cutout, the timer will remain at zero and if the pressure
then falls below the cutout again, the system will shut
down on a low pressure fault.
If the Dip Switch on the microprocessor board is set
for “Water Cooling” (see Section 3.7), the cutout is
programmable between 44 - 70 PSIG (3-5 bar) for both
R22 and R-407c models. In this mode, settings of 44
PSIG (3 bar) for R22 and R-407C are recommended. If
the Switch is set for “Brine Cooling” (glycol) the cutout
is programmable between 5 - 70 PSIG (0.3 bar) for R22
and R-407c models. In this mode, the cutout should be
167

Micro Panel Contents

FORM 201.19-NM1 (204)

set to the saturated refrigerant pressure equivalent to
18°F (10°C) below the lowest temperature of the programmed chilled liquid Control Range (Section 6).

To program the Low Ambient Cutout, key in the required
setting and press the Enter key to store the value into
memory and scroll to the next display.

To program the Suction Pressure Cutout, key in the required setting and press the Enter key to store the value
into memory and scroll the next display.

Low Leaving Liquid Temperature Cutout

High Ambient Temperature Cutout

The Low Leaving Liquid Temperature Cutout protects
the evaporator from damage due to ice build up caused
by operation below the chilled liquid freezing point.

H I G H
A M B I E N T
T E M P
C U T O U T
=
1 3 0 . 0 ° F

The High Ambient Cutout is used to select the ambient
temperature above which the chiller may not operate.
If the ambient temperature rises 1°F (.5°C) above this
point, the chiller will shut down. Restart will occur automatically, when temperature falls more than 2°F (1°C)
below the cutout and cooling demand is present.
This cutout is normally set at 130°F (54°C) to allow operation to the absolute maximum temperature capability
of the electromechanical components; however, values
between 100.0 - 130.0°F (38 - 54°C) are accepted.
To program the High Ambient Cutout, key in the required setting and press the Enter key to store the value
into memory and scroll to the next display.
Low Ambient Temperature Cutout
L OW
A M B I E N T
T E M P
C U T O U T
=
2 5 . 0 ° F

The Low Ambient Cutout is used to select the ambient
temperature below which the chiller may not operate.
If the ambient temperature falls 1°F (.5°C) below this
point, the chiller will shut down. Restart will occur
automatically, when temperature rises more than 2°F
(2ºC) above the cutout and cooling demand is present
(see also Section 2.5 page 139).
If the SW1 Dip Switch on the Microprocessor Board
is set for “Standard Ambient Control” (see Section
3.7) the low ambient cutout is set at 25°F (-4°C) and is
NOT programmable. If the Dip Switch is set for “Low
Ambient Control”, programming of the cutout between
00.0 - 50.0°F (-17.8 - 10°C) is allowed. This allows
higher values than 25°F (-4°C) to be programmed to
shut down the chiller when other cooling methods
become operational. Values below 25°F (-4°C) can
be used for applications requiring chiller operation at
lower temperatures. The chiller will not operate below
0ºF (-17.8ºC).

168

L E A V I N G
L I Q U I D
T E M P
C U T O U T
=
3 6 . 0 ° F

If the leaving chilled liquid temperature (water or glycol)
drops below the cutout point, the chiller will shut down.
The chiller will restart automatically when temperature
rises more than 4°F (2°C) above the cutout point and
cooling demand exists.
If the Dip Switch on the microprocessor board is set
for “Water Cooling” (see Section 3.7, page 146) the
cutout is automatically set at 36°F (2°C) and cannot be
reprogrammed. If the Switch is set for “Brine Cooling”
(glycol) the cutout can be programmed between 08.0
- 36.0°F (-13 to -2°C). The cutout should normally be
set to 4°F (2°C) below the setpoint minus the range, i.e.
34°F (setpoint) – 2°F (range) - 4°F = 28°F (see Section
6, page 158).
To program the Leaving Liquid Temperature Cutout, key
in the required setting and press the Enter key to store the
value into memory and scroll to the next display.
High Motor Current Unload Point
H I G H
MO T O R
C U R R E N T
U N L O A D
=
1 0 5 %
F L A

The Motor Current Unload point is used to avoid a
high motor current safety shutdown by unloading a
compressor, if current draw approaches the maximum
limit cutout value. The chiller can then continue to run
automatically at reduced capacity until the cause of the
excessive current is attended to.
The micro will accept between 30 - 105% for the unload
point. The motor current safety will shut the compressor
down whenever current exceeds 115%.
If the programmable limit is set between 100% and
105% of full load current, this feature will protect
against excessive current causing compressor shutdown
due to extremely high ambient, high chilled liquid temperature, and condenser malfunction caused by dirt or
fan problems.
YORK INTERNATIONAL

FORM 201.19-NM1 (204)

If the programmable limit is set below 100% of full load
current, this control feature can be used for “demand
limiting”. This is important when demand limiting is
critical due to power requirements or limitations in the
building (See also Section 1.10).
For the first 60 seconds of operation, the unloading
control is disabled. After this time, if motor current
exceeds the programmed limit, the SYS X CURR
LIMITING message will appear on the display and a
1 second unload pulse will be sent to the slide valve
of the affected compressor every 5 seconds, until the
motor current drops below the programmed limit. The
message will be removed and additional loading will
take place when motor current drops below 90% of the
programmed threshold.
Typically, this setpoint should be set at 100% for
maximum motor protection. Programming for 100%
is recommended. When programming values below
100%, the use of a leading “0” is required, e.g. 085%.
To program the High Motor Current Unload, key in the
required setting and press the Enter key to store the value
into memory and scroll to the next display.
Anti-Recycle
A N T I Time
R E C Y C L E
=

6 0 0

T I M E R

S E C S

The Anti-Recycle Timer controls the minimum time
between starts for each compressor. This is the time
available for the heat build-up caused by inrush current
at start to be dissipated before the next start. Insufficient
cooling time between starts can cause heat build-up
and motor damage. A fast compressor start response
is needed in some applications and not in others. Although the minimum setting allowed on this timer will
avoid excessive heat build up, adjusting the timer for
the longest period acceptable in each application will
reduce cycling and maximize motor life. 600 seconds
is recommended.
The micro will accept a range of programmable values
between 300 - 600 seconds.
To program the Anti-Recycle Time, key in the required
setting and press the Enter key to store the value into
memory and scroll to the next display.

YORK INTERNATIONAL

SUCTION SUPERHEAT
SETPOINT = 12.0 º F

The EEV superheat setpoint is programmable. The
setpoint can be programmed for 9.0ºF (5.0ºC) to 15ºF
(8.3ºC) with 12.0ºF (6.6ºC) as the default.
Local/Remote Communications
L O C A L

R E MO T E
L O C A L

MO D E

The panel can be programmed for “Local” or “Remote”
communications. “Local” mode allows monitoring only
through the RS-485 port. “Remote,” allows an external
device such as an ISN or Remote Control Center to
change setpoints and programming points, as well as
monitoring chiller parameters.
The
keys are used to change from Local to Remote.
The ENTER Key must be pressed to save the selection
in memory.
Imperial/SI Units Display
D I S P L A Y
U N I T S
I M P E R I A L

This allows the operator to select messages to display
Imperial Units (PSIG, °F, etc.) or SI (Scientific International, Bars, °C, etc.).
The
keys are used to change from Imperial to SI
units. The ENTER Key must be pressed to save the
selection in memory.
Automatic/Manual “Lead/Lag”
L E A D

/
L A G
C O N T R O L
A U T OM A T I C

The chiller may be selected for manual lead/lag or automatic lead/lag. In some cases the operator may want to
manually select the system that is desired to be the lead
system. In most cases, automatic lead/lag is selected to
allow the micro to attempt to balance run time between
the system. Details of manual and automatic lead / lag
operation are outlined in Section 1.21.
The
keys are used to change from Automatic to
Manual lead/lag. The ENTER key must be pressed to
save the selection in memory.

169

Micro Panel Contents
If manual control is desired, press the or key. One
of the following messages will be displayed:
L E A D / L A G
C O N T R O L
M A N U A L
S Y S
1
L E A D

FORM 201.19-NM1 (204)

Press the Program key again, key in the numbers “6140”,
then press Enter. As the code is being keyed in, the digits
are not displayed but are shown as “*” as shown:
P R O G R A M

MO D E

* * * *
L E A D / L A G
C O N T R O L
M A N U A L
S Y S
2
L E A D

System 1 or 2 can be selected as the lead by pressing
the or key. The ENTER key must be pressed to
save the selection in memory.
Automatic/Manual Power Failure Restart
P OWE R

F A I L
R E S T A R T
A U T OM A T I C

The chiller may be selected for “Automatic” or “Manual” restart after a power failure. In most instances,
“Automatic Restart” is preferred to allow the chiller
to automatically restart when power is reapplied after
a power failure. When “Manual” is selected, the chiller
will not operate after re-application of power until the
ON / OFF Rocker Switch on the keypad is cycled OFF
and then ON.

In most applications, it is undesirable
to use Manual Reset on power failure
since chillers normally are required to
auto-restart after a power failure.

8.3

When the Enter key is pressed, the following message
will appear:
D E F A U L T
S E T P O I N T S
1
=
Y E S ,
0
=
N O,

?
1

Key in a “1” for if default setpoints are required, or a “0”
for individually programmed values, then press Enter to
store the selection into memory.
If individual programming is selected (0), the display
will now return to the Status display. If a default setpoints
have been selected, the display will momentarily display
the message shown below before returning to the Status
display:
P R O G R A M
O P T I O N S
S E T
T O
D E F A U L T
V A L U E S

It is often easier to select Default
Setpoints and then reprogram a few
that require changing rath er than
programming each individual value
from scratch.

PROGRAMMING "DEFAULT" VALUES

Programmable values may be individually programmed at
start-up or any time thereafter. For ease of programming,
once the type of refrigerant is programmed under the Program key and in the Service Mode, a “defaults password”
may be programmed to automatically program default
values into memory. This will preset all programmable
values under the Program key to values that will allow
operation of the chiller under most operating conditions.
This allows quick start-up programming for typical
chilled water applications.
To program the default values into memory, first press
the PROGRAM key followed by the ENTER key, to
program the “refrigerant type” .

170

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

The default values shown below are entered into
memory, when the program option is selected. The
list also provides the low and high limits the micro
will accept.

Program Value

8
Mode

Low Limit

High Limit

Default

Display Language

English

Discharge Pressure Cutout

200 PSIG

399 PSIG

Discharge Pressure Unload

-Water Cooling

Suction Pressure Cutout
Glycol Cooling
High Ambient Air Temp Cutout

Low Ambient Ait Temperature Cutout

27.5 Bars

399 PSIG

375 PSIG

13.8 Bars

27.5 Bars

25.9 Bars

44.0 PSIG

70.0 PSIG

44.0 PSIG

3.03 Bars

4.83 Bars

30.3 Bars

5.0 PSIG

70.0 PSIG

44.0 PSIG

0.34 Bars

4.83 Bars

3.03 Bars

100.0 ºF

130.0 ºF

37.8 ºC

54.4 ºC

Standard

25.0 ºF

Ambient

-3.9

Low

0 ºF

50.0 ºF

25.0 ºF

Ambient

-17.8 ºC

10.0 ºC

-3.9 ºC

36.0

Water Cooling
Leaving Chilled Liquid Temp Cutout

13.8 Bars
200 PSIG

Glycol Cooling
Low Temp Glycol

2.2

8.0 ºF

36.0 ºF

-13.3 ºC

2.2 ºC

-5.0 ºF

36.0 ºF

-20.5 ºC

2.2 ºC

High Motor Current Unload

30%

105%

100

Anti Recycle Time

300 sec

600 sec

Local / Remote Mode

Local

Units Mode

Imperial

Lead / Lag Control Mode

Automatic

Power Failure Restart Mode

Automatic

Motor Current Averaging Cutout

30% FLA

110% FLa

70 % FLA

9.0 ºF

15.0 ºF

12.0 ºF

5.0 ºC

8.3 ºC

6.6 ºC

Suction Superheat Setpoint

YORK INTERNATIONAL

EEV

171

Micro Panel Contents

FORM 201.19-NM1 (204)

8.4 ELECTRONIC EXPANSION VALVE
ELECTRONIC EXPANSION VALVE

The Electronic Expansion Valve (EEV) is an electronically controlled expansion valve. The control algorithms to control the EEV reside in the micorprocessor
software. The superheat setpoint can be programmed
on the control panel.

setpoint. The refrigerant flow direction is designated
by an arrow on the expansion valve body.
There are two safeties associated with the EEV; Low
Superheat Cutout and Sensor Failure Cutout.

The purpose of the EEV is to meter a flow of liquid
refrigerant into the evaporator to maintain a superheat
120 VAC PILOT
SOLENOID

IN
OUT

EXPANSION
VALVE
24 VAC HEAT
MOTOR

FIG. 50 – ELECTRONIC EXPANSION VALVE

172

LD09132

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

8.5 EEV OPERATION
EEV OPERATION

MOP FEATURE

The EEV is an electronically controlled expansion valve
that meters a flow of liquid refrigerant into the evaporator to control superheat. The refrigerant flow direction is
designated by an arrow on the expansion valve body.

The controller also has an MOP feature (Maximum Operating Pressure) that overrides superheat control when
the MOP setpoint is exceeded. This control generally
will be active for hot water starts. The MOP setpoint is
60º F Saturated Suction Temperature.

24VAC HEAT MOTOR

The 24VAC Heat Motor is fed from the EEV output
board in the control panel . The Heat Motor allows the
micro to open and close the valve to control suction
superheat.

The heat motor must be plugged into
the 24 volt shielded cable feed from
the EEV output board. Damage to the
heat motor will occur if it is plugged
into 120VAC wiring for the Pilot Solenoid.

The MOP feature is also used to prevent undershoot of
the superheat setpoint when the suction temperature of a
system being started is much higher than the return water temperature. This provides better startup superheat
control for high ambient, low water temp startups when
the superheat measurement is artificially high due to
the warm suction line. If the return water temp sensor
is in range, run time is less than 5 minutes, and suction
temperature is greater than (RCHLT + 3º F), the MOP
setpoint is reset to RCHLT - Superheat Setpoint. If this
value is higher than the fixed MOP setpoint, the original
setpoint is retained.
VALVE PREHEAT FEATURE

CONTROLLER

When EEV is selected as the expansion valve type via
DIP switch on the micro board, the EEV controller will
become active. When TXV is selected, the EEV output
will be fixed at 0 and the low superheat and sensor
failure safeties will be disabled.

The heat motor is preheated for moderate and low ambient standby conditions. When the ambient is below 25º
F, the heat motor is preheated with a 25% duty cycle.
This preheated value is ramped from 25% to 0% from
25º F to 50º F. When the ambient is above 50º F the heat
motor is not preheated.
PILOT SOLENOID (LLSV) CONTROL

The EEV controller is a PI (Proportional plus Integral)
controller. Gain scheduling varies the proportional gain
based on the superheat error. As the superheat error
gets smaller the proportional gain will get smaller. The
integration time is adjusted to increase the controller response during start-up and low superheat conditions.
The output from the PI controller is the EEV output
percentage which is shown on the display and printouts.
This output is then fed into a model of the ETRE bulb/
heat motor to over and under drive the heat motor for
faster valve response. The output of this ETRE model
is the PWM percentage that will be sent to the ETRE
heat motor. This PWM output is the percentage of a 1
second period that the 24VAC heat motor power signal
is energized.

YORK INTERNATIONAL

The Pilot Solenoid allows the EEV to be used in the
same way as a Liquid Line Solenoid Valve. When the
Pilot Solenoid is turned off, the EEV closes immediately
and prevents the Heat Motor from opening the valve.
Each system has a Pump Down feature upon shut off.
Manual pump down from the keypad is not possible. On
a non-safety, non-unit switch shutdown, the system will
fully unload. The Pilot Solenoid will be turned off and
the system will run unloaded until the suction pressure
falls below the cutout or for 180 seconds, whichever
comes first.

173

Micro Panel Contents

FORM 201.19-NM1 (204)

The Pilot Solenoid is also used as a low superheat safety
device when EEV is selected as the expansion valve
type, for YCAL units only. While the system is running
and not in a pumpdown mode the Pilot Solenoid will
close if the suction superheat falls below 4.0º F. The
Pilot Solenoid will open again when the superheat rises
above 7.0º F. This safety device is ignored for the first
30 seconds of system run time. If the Pilot Solenoid is
closed 10 times in 2 minutes on the safety device, the
low superheat safety will be triggered.
LOW SUPERHEAT CUTOUT SAFETY

The Low Superheat Cutout is to protect the compressors
from liquid floodback due to low suction superheat. This
safety is only active when EEV is selected as the expansion valve type. This safety is ignored for the first 30
seconds of system run time.
This safety can be triggered by two events. The first is
when the suction superheat is less than 0.5º F (1.1ºC)
for 3 seconds. The second, only applies to YCAL units,
is when the Pilot Solenoid is closed 10 times in 2 minutes due to low superheat. Following are the safety fault
messages for all systems:
S Y S
S Y S

1
2

L O W
L O W

SU P E R H E A T
SU P E R H E A T

SENSOR FAILURE CUTOUT SAFETY

The Sensor Failure Cutout is to prevent the EEV from
running when the sensors measuring superheat are not
functioning properly. This safety is only active when
EEV is selected as the expansion valve type. This safety
is ignored for the first 15 seconds of system run time.
This safety will shutdown a system if either suction temperature or suction pressure sensors read out of range
high or low. This condition must be present for 3 seconds
to cause a system shutdown. This safety will lock out a
system the first time and will not allow automatic restarting. Following are the messages for all systems:
S Y S
S Y S

174

1
2

S E N S O R
S E N S O R

F A I L U R E
F A I L U R E

OPERATING DATA DISPLAYS

The following display relating to EEV operation is available under each systems Data Key: EEV Output% and
Suction Superheat.
S Y S
X E E V
S U C T S H E A T

= XXX.X %
= XXX.X ºF

HISTORY DATA DISPLAYS

The following display relating to EEV operation is available under each systems Data Key: EEV Output% and
Suction Superheat.
S Y S
X E E V
S U C T S H E A T

= XXX.X %
= XXX.X ºF

OPERATING DATA PRINTOUT

Pressing the PRINT key and then the OPER DATA key
allows the operator to obtain a printout of current system
operating parameters. When the OPER DATA key is
pressed, a snapshot will be taken of system operating
conditions and panel programming selections. This data
will be temporarily stored in memory and transmission
of this data will begin to the printer. The following items
are added to the standard operational data printout when
EEV is selected:

SYSTEM 1 DATA
COMPRESSORS STATUS
OFF
RUN TIME
0- 0- 0- 0 D-H-M-S
MOTOR CURRENT
0 AMPS 0 %FLA
SUCTION PRESSURE
125 PSIG
DISCHARGE PRESSURE
131 PSIG
OIL PRESSURE
130 PSIG
FAN DISCHARGE PRESS
254 PSIG(B HR)
SUCTION TEMPERATURE
68.4 DEGF
DISCHARGE TEMPERATURE
68.8 DEGF
OIL TEMPERATURE
68.8 DEGF
SAT SUCTION TEMP
71.8 DEGF
SUCTION SUPERHEAT
3.4 DEGF
SAT DISCHARGE TEMP
74.5 DEGF
DISCHARGE SUPERHEAT
6.3 DEGF
SLIDE VALVE STEP
0
EEV OUTPUT
0.0 %(EEV)
COOLER INLET REFRIG
44.6 DEGF
LIQUID LINE SOLENOID
OFF
ECONOMIZER TXV SOLENOID
OFF(YCAS)
OIL COOLING SOLENOID
OFF(YCWS)
HEAT RECOVERY SOLENOID
OFF(B HR)
DISCHARGE COOLING SOLENOID
OFF(EC,LT)
CONDENSER FAN STAGE
OFF
COMPRESSOR HEATER
ON
WYE-DELTA RELAY
OFF

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

8.6 EEV PROGRAMMING
EXPANSION VALVE OPTIONS DISPLAY

PROGRAM MODE DISPLAYS

When the expansion valve type is set to thermostatic
by opening DIP switch #7, the EEV controller, low
superheat safety device, low superheat safety and the
sensor failure safety will be disabled. The EEV output
will be set to 0.

The following value is programmable under the PROGRAM key (See Table 2).
· System Suction Superheat Setpoint (9.0°F to 15.0°F)
(5.0ºC to 8.3ºC)

S1 - 7

S U C T S U P E R H E A T
S E T P O I N T
= XX.X ºF

EX P A N S I O N
V A L V E
T H E R M O S T A T I C

When the expansion valve type is set to electronic
by closing DIP switch #7 , the EEV controller, low
superheat safety device, low superheat safety and the
sensor failure safety will be enabled.
S1 - 7

EX P A N S I O N
V A L V E
T H E R M O S T A T I C

The Expansion Valve type selection is viewable under
the OPTIONS key.

TABLE 2 – PROGRAMMABLE VALUES TABLE (MINIMUM/MAXIMUM)
PROGRAM VALUE

MODE

SUPERHEAT SETPOINT

EEV

YORK INTERNATIONAL

LOW LIMIT

HIGH LIMIT

DEFAULT

9.0°F

15.0°F

12.0°F

(5.0°C)

(8.3°C)

(6.6°C)

175

Micro Panel Contents

FORM 201.19-NM1 (204)

8.7 EEV TROUBLESHOOTING
TROUBLESHOOTING

Below are problems and possible solutions or items
to check.
● The system shuts down on Low Suction
Pressure
· Verify that all refrigerant valves are open.
· Verify that the system is not low on charge.
· Verify that the Expansion Valve Type is set to Electronic.
· Verify that the pilot solenoid is energizing (use Service
Mode to manually energize the solenoid coil).
· Verify that the EEV is wired per the elementary diagram.
· Verify that the Heat Motor is getting a 24VAC PWM
signal. (Use Service Mode to manually energize
the EEV output.
· If everything checks out, it is possible that the EEV
has failed. If the small charge in the bulb leaks, the
valve will not be able to open and the entire EEV
must be replaced.

176

● The system shuts down on Low Superheat
· Verify that the suction temperature sensors are properly
installed. They should be located at 4 or 8 o’clock
on the suction line. They should not be located near
the outlet of the evaporator. They should be installed
with copper straps and be well insulated.
· Verify that the suction temperature sensor cables are
not swapped between systems (unplugging one sensor at a time with the chiller off can verify proper
wiring).
· Verify that the EEV heat motor is properly insulated.
· For units with Hot Gas Bypass installed, check that the
Hot Gas Bypass valve is set correctly.
· For glycol units, verify that the glycol % is correct.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

8.8 CONDENSER FAN CONTROL
The chiller is equipped with 8 or 10 condenser fans, with
4 or 5 fans per system as given below. Fan control is
via Outside Ambient Temperature (OAT) and Discharge
Pressure (DP). There are 4 or 5 stages of fan control,
utilizing 3 outputs per system. The fan stages will work
according to Table 3 and 4 depending on the number of
fans per system. There will be a variable delay between
all fan stages. The delay between turning on fan stages
is based on the ambient temperature. The time is ramped
from 30 seconds at 10ºF (-12.2ºC) to 5 seconds at 60ºF
(15.6ºC) (time delay = (35 - (oat/2)).
Condenser fan ON conditions are governed solely by the
Discharge Pressure (DP). When the DP rises above 230
PSIG, fan stage 1 is activated. From here, subsequent
fan stages are activated as the DP rises in increments of
10 - 20 PSIG. The system will remain at the highest fan
stage reached unless the OFF conditions are satisfied.
Condenser fan OFF conditions are governed by both
the DP and OAT. Fan staging will be decreased from
the highest fan stage reached if both the DP and OAT
requirements are met. For example, if a system is at
a fan stage of 4, and the DP falls under 205 PSIG and
the OAT drops below 75ºF (24ºC), the fan stage will be
reduced to 3.

YORK INTERNATIONAL

Tables 3 and 4 describe fan operation and contactor data
for the fans involved in each fan stage. SYS 1 uses relay
board #1. SYS 2 uses relay board #2.
YCAS0130, 0140, 0150, 0160, 0170 and 0190 models
have 4 condenser fans/system:

LD03676

FIG. 51 – CONDENSER FAN LAYOUT FOR DXST 2
COMPRESSOR UNITS

177

Micro Panel Contents

FORM 201.19-NM1 (204)

TABLE 3 – CONDENSER FAN CONTROL AND FAN CONTACTOR DATA FOR DXST UNITS
WITH 4 FANS/SYSTEM

S
Y
S
1
S
Y
S
2

Fan
Stage

Fans

ON * **
Conditions
DP

OFF *
Conditions
DP & OAT

Fan
Contactor

Wire
Number

1
2
3
4
1
2
3
4

1
5&7
1, 5, & 7
1, 3, 5, & 7
2
6&8
2, 6, & 8
2, 4, 6, & 8

>230 PSIG
>250 PSIG
>265 PSIG
>275 PSIG
>230 PSIG
>250 PSIG
>265 PSIG
>275 PSIG

<160 PSIG & <60°F
<180 PSIG & <65°F
<195 PSIG & <70°F
<205 PSIG & <75°F
<160 PSIG & <60°F
<180 PSIG & <65°F
<195 PSIG & <70°F
<205 PSIG & <75°F

9M
11M & 12M
9M, 11M, & 12M
9M, 10M, 11M, & 12M
15M
17M & 18M
15M, 17M, & 18M
15M, 16M, 17M, & 18M

130
132
130 & 132
130, 131, & 132
230
232
230 & 232
230, 231, & 232

* Sys 1 Outputs are on Relay Output Board #1

Relay
Board
Output*
15
10
10 & 15
10, 14, & 15
15
10
10 & 15
10, 14, & 15

** At ambients above 85ºF, Stages 3 and 4 will both turn on at 240 PSIG.

Sys 2 Outputs are on Relay Output Board #2

TABLE 4 – CONDENSER FAN CONTROL AND FAN CONTACTOR DATA FOR DXST UNITS
WITH 5 FANS/SYSTEM

S
Y
S
1
S
Y
S
2

Fan
Stage

Fans

1
2
3
4
5
1
2
3
4
5

1
7&9
1, 7, & 9
3, 5, 7, & 9
1, 3, 5, 7, & 9
2
8, & 10
2, 8, &10
4, 6, 8, & 10
2, 4, 6, 8, & 10

ON * **
Conditions
DP
>230 PSIG
>250 PSIG
>265 PSIG
>275 PSIG
>285 PSIG
>230 PSIG
>250 PSIG
>265 PSIG
>275 PSIG
>285 PSIG

* Sys 1 Outputs are on Relay Board #1

OFF *
Conditions
DP & OAT
<160 PSIG & <60°F
<180 PSIG & <65°F
<195 PSIG & <70°F
<205 PSIG & <75°F
<210 PSIG & <80°F
<160 PSIG & <60°F
<180 PSIG & <65°F
<195 PSIG & <70°F
<205 PSIG & <75°F
<210 PSIG & <80°F

Fan
Contactor

Wire
Number

9M
12M & 13M
9M, 12M, & 13M
10M, 11M, 12M, & 13M

130
132
130 & 132
131 & 132
130, 131, & 132
230
232
230 & 232
231 & 232
230, 231, & 232

9M, 10M, 11M, 12M, &13M

15M
18M & 19M
15M, 18M, & 19M
16M, 17M, 18M, 19M
15M, 16M, 17M, 18M, & 19M

Relay
Board
Output*
15
10
10 & 15
14 & 15
10, 14, & 15
15
10
10 & 15
14 & 15
10, 14, & 15

** At ambients above 85ºF, Stages 3, 4 and 5 will both turn on at 240 PSIG.

Sys 2 Outputs are on Relay Output Board #2

178

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

8.9 SERVICE MODE: UNIT SETUP

The Service Mode allows programming unit set-up
values. These values are programmed before the
chiller leaves the factory and typically should never
be changed.

Catastrophic failure of chiller components can occur if the set-up values are
improperly programmed. If for some
reason these values need to be checked
or changed, care should be exercised.
Whenever an EPROM is changed, the
programmed values should be recorded prior to removing the old EPROM.
These values should then be checked
and programmed into the micro when
the new EPROM is installed.
Setup values may be checked in the Service Mode by
pressing the PROGRAM, 5144, and ENTER keys.
Table 5 lists the value and the program range that will
be accepted.

TABLE 5 – SERVICE MODE
PROGRAMMABLE VALUES
SETUP MODE VALUE

PROGRAMMABLE RANGE

Refrigerant Type

R-22 or R-407C

R-407C Chiller Type

Optimized or Drop-in

Unit Type

YCAS or YCWS **

Heat Recovery Unit

Enabled or Disabled ***

Sys 1 100% Full Load Amps

75 to 500 Amps *

Sys 2 100% Full Load Amps

75 to 500 Amps *

Sys 1 Motor Protector Input

1.0 to 5.0 volts *

Sys 2 Motor Protector Input

1.0 to 5.0 volts *

Oil Cooling On

167 to 203 ºF

Oil Cooling Diff

9 to 18 ºF

180 ºF default ****
9 ºF default ****
Discharge Cooling On

176.0 to 239.0 ºF
212.0 ºF default

Discharge Cooling Diff

7.2 to 27.0 ºF

Data Logging Mode

OFF or ON

18 ºF default
Data Logging Timer

6 to 60 seconds

Sys 1 Operating Hours

0 to 99,999

Sys 2 Operating Hours

0 to 99,999

Sys 1 Starts

0 to 99,999

Sys 2 Starts

0 to 99,999

Clear History Buffer

YES or NO

NOTE:
* See Table 6 or 7 for programming system 100% Full
Load Amps and System Motor Protector input voltage. Also assure that the correct number of wires
per phase pass through each C.T. The C.T. is built
internally into the 2ACE motor protector.
** The chiller must always be programmed for YCAS
*** Heat recovery must always be disabled.
**** Oil and discharge cooling is only utilized on special low temp chiller.

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179

Micro Panel Contents

FORM 201.19-NM1 (204)

TABLE 6 – YCAS STYLE G, ACROSS THE LINE START - 60 HZ.

MODEL
NO.

130

140

150
SYS 1

150
SYS 2

160

170
SYS 1

170
SYS 2

180

VOLTAGE
CODE

CHILLER
NAMEPLATE
RLA

NO. OF
LEADS
PER PHASE
THRU CT.

100% FLA
OF SYSTEM

MP INPUT
VOLTAGE

246

266

3.65

214

231

3.2

130

140

3.89

107

116

3.2

2.58

267

288

1.99

232

251

3.49

140

151

4.2

116

125

3.49

100

2.78

295

319

2.2

256

276

1.91

155

167

4.64

128

138

3.84

103

111

3.09

265

286

1.97

230

248

3.44

139

150

4.18

115

124

3.44

2.75

295

319

2.2

256

276

1.91

155

167

4.64

128

138

3.84

103

111

3.09

321

347

2.4

279

301

2.09

169

182

2.53

140

151

4.2

112

121

3.35

295

319

2.2

256

276

1.91

155

167

4.64

128

138

3.84

103

111

3.09

321

347

2.4

279

301

2.09

169

182

2.53

140

151

4.2

112

121

3.35

* Indicates one lead/phase through motor protector.
180

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FORM 201.19-NM1 (204)

TABLE 6 – YCAS STYLE G, ACROSS THE LINE START - 60 HZ. (CONT'D)

MODEL
NO.

200

210
SYS 1

210
SYS 2

230

VOLTAGE
CODE

CHILLER
NAMEPLATE
RLA

NO. OF
LEADS
PER PHASE
THRU CT.

100% FLA
OF SYSTEM

MP INPUT
VOLTAGE

342

369

2.55

298

322

2.24

181

195

2.71

149

161

4.46

119

129

3.58

374

404

2.8

325

351

2.44

197

213

2.95

163

176

2.44

130

140

3.89

342

369

2.55

298

322

2.24

181

195

2.71

149

161

4.46

119

129

3.58

374

404

2.8

325

351

2.44

197

213

2.95

163

176

2.44

130

140

3.89

* Indicates one lead/phase through motor protector.

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181

Micro Panel Contents

FORM 201.19-NM1 (204)

TABLE 7 – YCAS STYLE G, WYE DELTA START - 60 HZ.

MODEL
NO.

130

140

150
SYS 1

150
SYS 2

160

170
SYS 1

170
SYS 2

180

VOLTAGE
CODE

CHILLER
NAMEPLATE
RLA

NO. OF
LEADS
PER PHASE

100% FLA
OF SYSTEM

MP SET
POINT
VOLTAGE

246

266

2.13

214

231

3.71

130

140

3.89

107

116

3.20

2.58

267

288

2.31

232

251

2.00

140

151

4.20

116

125

3.46

100

2.8

295

319

2.56

256

276

2.22

155

167

4.64

128

138

3.84

103

111

3.09

265

286

2.31

230

248

2.00

139

150

4.18

115

124

3.44

2.75

295

319

2.56

256

276

2.22

155

167

4.64

128

138

3.84

103

111

3.09

321

347

2.8

279

301

2.42

169

182

2.93

140

151

4.20

112

121

3.35

295

319

2.56

256

276

2.22

155

167

4.64

128

138

3.84

103

111

3.09

321

347

2.8

279

301

2.42

169

182

2.93

140

151

4.20

112

121

3.35

* Indicates one lead/phase through motor protector.
182

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TABLE 7 – YCAS STYLE G, WYE DELTA START - 60 HZ. (CONT'D)

MODEL
NO.

200

210
SYS 1

210
SYS 2

230

VOLTAGE
CODE

CHILLER
NAMEPLATE
RLA

NO. OF
LEADS
PER PHASE
THRU CT.

100% FLA
OF SYSTEM

MP INPUT
VOLTAGE

342

369

2.98

298

322

2.60

181

195

3.15

149

161

4.47

119

129

3.58

374

403

3.24

325

351

2.82

197

213

3.42

163

176

2.84

130

140

3.89

342

369

2.98

298

322

2.60

181

195

3.15

149

161

4.47

119

129

3.58

374

403

3.24

325

351

2.82

197

213

3.42

163

176

2.84

130

140

3.89

* Indicates one lead/phase through motor protector.

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183

Micro Panel Contents
SERVICE MODE: VIEWING INPUTS AND OUTPUTS

All digital and analog inputs and digital outputs can be
viewed by pressing the FUNCTION key and the pressing of the OPER DATA key. The UP and DOWN arrow
keys can then be used to scroll through the inputs and
outputs.
Each analog input will display the name of the measured
value, the input plug/pin number on the microboard, the
voltage read on the input, and the voltage converted to
pressure or temperature. An example is shown below:
SYS
X.X

1 SUCT PR J13-7
V D C = X X X X PSIG

Each digital input will display the name of the measured
value, the input plug/pin number on the micro board,
and the state of the input (ON or OFF). An example is
shown below:
SYS 1 RUN PERM
J4-5 IS OFF

FORM 201.19-NM1 (204)

SERVICE MODE: OUTPUT ENABLE

The Service Mode allows the user to enable and disable
the outputs (except compressor). To enter the Service
Mode, turn the UNIT switch off and press PROGRAM,
9675, ENTER. A message will be displayed for 2 seconds indicating that the service mode has been enabled.
Service Mode will time out after 60 minutes and return
to the normal mode. Service mode can also be disabled
by turning the UNIT switch on or by powering the 115
VAC off and on.
Once Service Mode is entered, all of the outputs will be
turned off. The outputs can be turned on by pressing.
FUNCTION and then the OPER DATA key and scrolling past the input displays to the output displays. The
arrow keys are used to scroll forward and backwards in
the displays, while the ENTER key is used to toggle the
outputs on and off. Only one output will be allowed on
at a time. The only exception will be the compressors
which cannot be turned on and off in this mode.

Each digital output will display the name of the item
controlled by the output, the output plug/pin number
on the microboard and the state of the output (ON and
OFF). An example is shown below:
SYS 1 LLSV
J7-3 IS OFF

184

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FORM 201.19-NM1 (204)

8.10 SENSOR CALIBRATION CHARTS
Leaving Chilled Liquid Temperature and
Return Chilled Liquid Temperature Sensors
Temperature
°F (C°)
14° (-10°)
18° (-7.8°)
21° (-6.1°)
25° (-3.9°)
28° (-2.2°)
32° (0.0°)
36° (2.2°)
39° (3.9°)
43° (6.1°)
46° (7.8°)
50° (10°)
68° (20°)
86° (30°)
104° (40°)

Voltage
VDC
1.45
1.57
1.69
1.80
1.93
2.05
2.17
2.30
2.42
2.54
2.66
3.22
3.69
4.05

TEST POINTS:
Leaving Water ................................................... Microboard J11-7/1
Return Water ..................................................... Microboard J11-8/2

Oil & Discharge Temperature Sensors
Temperature
°F (°C)
32° (0°)
50° (10°)
68° (20°)
86° (30°)
104° (40°)
122° (50°)
140° (60°)
158° (70°)
176° (80°)
194° (90°)
212° (100°)
230° (110°)
248° (120°)
266° (130°)
284° (140°)
302° (150°)

Voltage
VDC
0.282
0.447
0.676
0.976
1.34
1.76
2.20
2.63
3.04
3.40
3.71
3.96
4.17
4.33
4.46
4.57

TEST POINTS:
Oil Temperature:
System 1: .................................................. Extension-board J10-7/3
System 2: .................................................. Extension-board J10-6/2
Discharge Temperature:
System 1: .................................................... Extension-board J8-4/1

Ambient Temperature Sensor
Temperature
°F (°C)
14° (-10°)
23° (-5°)
32° (0.0°)
41° (5°)
50° (10°)
59° (15°)
68° (20°)
77° (25°)
86° (30°)
95° (35°)
104° (40°)

Voltage
VDC
0.97
1.20
1.45
1.72
2.00
2.29
2.58
2.85
3.11
3.35
3.57

TEST POINT:
Test Point........................................................... Microboard J11-9/3

System 2: .................................................... Extension-board J8-6/3

Pressure Transducers
0 - 200 PSIG Transducer
Pressure
Voltage
PSIG
VDC
0
0.5
25
1.0
50
1.5
75
2.0
100
2.5
125
3.0
150
3.5
175
4.0
200
4.5

0 - 400 PSIG Transducer
Pressure
Voltage
PSIG
VDC
0
0.5
50
1.0
100
1.5
150
2.0
200
2.5
250
3.0
300
3.5
350
4.0
400
4.5

Red Wire = 5V, Black wire = 0V, White/Green Wire = signal
TEST POINTS:
Suction Pressure:
System 1: .......................................................... Microboard J13-7/1
System 2: .......................................................... Microboard J14-7/1
Oil Pressure:
System 1: .......................................................... Microboard J13-8/3
System 2: .......................................................... Microboard J14-8/3
Discharge Pressure:
System 1: .......................................................... Microboard J15-8/3
System 2: .......................................................... Microboard J15-7/1

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185

Micro Panel Contents

FORM 201.19-NM1 (204)

8.11 CONTROL INPUTS/OUTPUTS
Tables 8 through 14 are a quick reference list providing
the connection points and a description of the inputs and
outputs respectively. All input and output connections
pertain to the connections at the microboard, relay, or
I/O Board.
TABLE 8 - DIGITAL OUTPUTS

186

Microboard / Relay Board 1

J7-1 / TB1-20

Sys 1 Compressor

Microboard / Relay Board 1

J7-2 / TB1-19

Sys 1 Compressor Heater

Microboard / Relay Board 1

J7-3 / TB1-18

Sys 1 Liquid Line Solenoid Valve

Microboard / Relay Board 1

J7-4 / TB1-17/16

Microboard / Relay Board 1

J7-5 / TB1-15

Sys 1 Condenser Fans Output 1

Microboard / Relay Board 1

J7-6 / TB1-14

Sys 1 Condenser Fans Output 2

Microboard / Relay Board 1

J9-1 / TB1-10

Sys 1 Condenser Fans Output 3

Microboard / Relay Board 1

J9-2 / TB1-9

Sys 1 Economizer TXV Solenoid

Microboard / Relay Board 1

J9-3 / TB1-8

Sys 1 Wye Delta Relay

Microboard / Relay Board 1

J9-4 / TB1-7

SPARE

Microboard / Relay Board 1

J9-5 / TB1-6/5

Evaporator Heater

Microboard / Relay Board 1

J9-6 / TB1-4/3

Sys 1 Alarm

SPARE

Microboard / Relay Board 2

J10 / TB1-20

Microboard / Relay Board 2

J10-2 / TB1-19

Sys 2 Compressor Heater

Sys 2 Compressor

Microboard / Relay Board 2

J10-3 / TB1-18

Sys 2 Liquid Line Solenoid Valve

Microboard / Relay Board 2

J10-4 / TB1-17/16

Microboard / Relay Board 2

J10-5 / TB1-15

Sys 2 Condenser Fans Output 1

Microboard / Relay Board 2

J10-6 / TB1-14

Sys 2 Condenser Fans Output 2

Microboard / Relay Board 2

J8-1 / TB1-10

Sys 2 Condenser Fans Output 3

Microboard / Relay Board 2

J8-2 / TB1-9

Sys 2 Economizer TXV Solenoid

Microboard / Relay Board 2

J8-3 / TB1-8

Sys 2 Wye Delta Relay

Chiller Run

Microboard / Relay Board 2

J8-4 / TB1-7

Microboard / Relay Board 2

J8-5 / TB1-6/5

Evaporator Pump

SPARE

Microboard / Relay Board 2

J8-6 / TB1-4/3

Sys 2 Alarm

I/O Expansion

J13-1

Sys 1 EEV Heat Motor

I/O Expansion

J13-2

Sys 2 EEV Heat Motor

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FORM 201.19-NM1 (204)

ANALOG INPUTS

Not all of the sensors are installed in every unit as some
of them are optional. However, the software must still be
able to read the sensors if the optional ones are installed.
Table 9 lists all of the analog inputs and whether they
are on the Microboard or the I/O Expansion Board.

TABLE 9 - ANALOG INPUTS
Microboard

J11-7

Leaving Chilled Liquid Temp Sensor

Microboard

J11-8

Return Chilled Liquid Temp Sensor

Microboard

J11-9

Ambient Air Temp Sensor

Microboard

J12-1

SPARE

Microboard

J12-3

SPARE

Microboard

J13-7

Sys 1 Suction Pressure Transducer

Microboard

J13-8

Sys 1 Oil Pressure Transducer

Microboard

J14-7

Sys 2 Suction Pressure Transducer

Microboard

J14-8

Sys 2 Oil Pressure Transducer

Microboard

J15-7

Sys 2 Discharge Pressure Transducer

Microboard

J15-8

Sys 1 Discharge Pressure Transducer

Microboard

J16-4

Sys 2 Suction Temp Sensor

Microboard

J16-6

Sys 1 Suction Temp Sensor

Microboard

J17-9

Input from I/O Expansion Board

Microboard

J17-10

SPARE

Microboard

J17-11

Mixed Chilled Liquid Temp Sensor (optional)
Hot Leaving Temp Sensor (Heat Recovery only)

I/O Expansion

J4-4

Sys 1 Motor Current

I/O Expansion

J4-5

SPARE

I/O Expansion

J4-8

SPARE

I/O Expansion

J4-10

Sys 2 Motor Current

I/O Expansion

J4-11

SPARE

I/O Expansion

J4-12

SPARE

I/O Expansion

J5-6

SPARE

I/O Expansion

J5-7

SPARE

I/O Expansion

J6-2

SPARE
Sys 1 Fan Pressure Transducer (Heat Recovery only)

I/O Expansion

J7-2

Sys 2 Evaporator Inlet Refrigerant Temp Sensor (R-407c only)

I/O Expansion

J8-4

Sys 1 Discharge Temp Sensor

I/O Expansion

J8-6

Sys 2 Discharge Temp Sensor

I/O Expansion

J9-2

SPARE
Sys 2 Fan Pressure Transducer (Heat Recovery only)

I/O Expansion

J10-6

Sys 2 Oil Temp Sensor

I/O Expansion

J10-7

Sys 1 Oil Temp Sensor

I/O Expansion

J11-2

Sys 1 Evaporator Inlet Refrigeration Temp Sensor (R-407c only)

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187

Micro Panel Contents

FORM 201.19-NM1 (204)

DIGITAL INPUTS

Table 10 lists all of the digital inputs and whether they
are on the Microboard or the I/O Expansion Board.
TABLE 10 - DIGITAL INPUTS
Microboard

J4-1

Unit Switch

Microboard

J4-2

PWM Current Limit

Microboard

J4-3

SPARE
Flow Switch (Euro CAT only)

Microboard

J4-4

PWM Temp Reset

Microboard

J4-5

Sys 1 Run Perm
Sys 1 Sys Switch (Euro CAT only)

Microboard

J4-6

Microboard

J4-7

Sys 2 Run Perm
Sys 2 Sys Switch (Euro CAT only)

Microboard

J4-8

SPARE
Hot Flow Switch (Heat Recovery only)

ANALOG OUTPUTS

Table 11 lists all the analog outputs and what output
board they are on.
TABLE 11 - ANALOG OUTPUTS

188

I/O Expansion

J2-1

Sys 1 Slide Valve

I/O Expansion

J12-1

Sys 2 Slide Valve

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FORM 201.19-NM1 (204)

8.12 ISN CONTROL
RECEIVED DATA (CONTROL DATA)

TRANSMITTED DATA

The microprocessor receives 8 data values from the
ISN. The first 4 are analog values and the last 4 are
digital values. These 8 data values are used as control
parameters when in REMOTE mode. When the unit is
in LOCAL mode, these 8 values are ignored. If the unit
receives no valid ISN transmission for 5 minutes it will
revert back to all local control values. Table 12 lists
the 4 control parameters. These values are found under
feature 54 on the ISN.

After receiving a valid transmission from the ISN, the
unit will transmit either operational data or history buffer data depending on the “History Buffer Request” on
ISN PAGE 06. Data must be transmitted for every ISN
page under feature 54. If there is no value to be sent to
a particular page, a zero will be sent. Tables 13 and 14
show the data values and page listings for this unit.

TABLE 12 – ISN RECEIVED DATA
ISN

CONTROL DATA

PAGE
P03
P04
P05

SETPOINT
ISN Current Limit
—

P06
P07
P08

—
START/STOP COMMAND (0 = STOP, 1 = RUN)
—

P09
P10

—
HISTORY BUFFER REQUEST
(0 = CURRENT DATA, 1 = LAST HISTORY DATA)

TABLE 13 – ISN TRANSMITTED DATA
ISN
Page

Character

Type

P11

8-11

Analog

Leaving Chilled Liquid Temp

P12

12-15

Return Chilled Liquid Temp

P13

16-19

Mixed Chilled Liquid Temp (optional) - YCAS
Leaving Hot Liquid Temp - YCWS
Hot Liquid Temp - Heat Recovery

P14

20-23

Sys 1 Suction Temperature

P15

24-27

Sys 1 Discharge Temperature

P16

28-31

Ambient Air Temperature

P17

32-35

Sys 1 Oil Temperature

P18

36-39

Sys 1 Oil Pressure

P19

40-43

Sys 1 Suction Pressure

P20

44-47

Sys 1 Discharge Pressure

P21

48-51

Sys 1 % Full Load Amps

P22

52-55

Sys 1 Total Run Hours

P23

56-59

Sys 1 Total Number of Stats

P24

60-63

Sys 1 Anti-Recycle Timer

P25

64-67

Anti-Coincident Timer

P26

68-71

Sys 2 Oil Temperature

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DXST Chiller Data

189

Micro Panel Contents

FORM 201.19-NM1 (204)

TABLE 13 – ISN TRANSMITTED DATA (CONT'D)

190

ISN
Page

Character

Type

P27

72-75

Sys 2 Oil Pressure

P28

76-79

Sys 2 Suction Pressure

P29

80-83

Sys 2 Discharge Pressure

P30

84-87

Sys 2 % Full Load Amps

P31

88-91

Sys 2 Total Run Hours

P32

92-95

Sys 2 Total Number of Starts

P33

96-99

Sys 2 Anti-Recycle Timer

P34

100-103

Sys 1 Evaporator Inlet Refrigerant Temp (R-407c only)

P35

104-107

P36

108

Diital

P37

109

Chiller Alarm

P38

110

Evaporator Heater Status (YCAS)

P39

111

Evaporator Pump Status

P40

112

Hot Liquid Flow Switch (Heat Recovery)

P41

113

Sys 1 Spare
Sys 1 Discharge Cooling Solenoid Status (Euro CAT, Low Temp)

P42

114

Sys 1 Liquid Line Solenoid Valve Status

DXST Chiller Data

Sys 2 Evaporator Inlet Refrigerant Temp (R-407c only)
Chiller Run

P43

115

Sys 1 Economizer TXV Solenoid Status (YCAS)
Sys 1 Oil Cooling Solenoid Status (YCWS)
Sys 1 Condenser Solenoid Status (EURO CAT)
Sys 1 Heat Recovery Solenoid Status (Heat Recovery)

P44

116

Sys 1 Wye-Delta

P45

117

Sys 2 Spare
Sys 2 Discharge Cooling Solenoid Status (Euro CAT, Low Temp)

P46

118

Sys 2 Liquid Line Solenoid Valve Status

P47

119

Sys 2 Economizer TXV Solenoid Status (YCAS)
Sys 2 Oil Cooling Solenoid Status (YCWS)
Sys 2 Condenser Solenoid Status (Euro CAT)
Sys 2 Heat Recovery Solenoid Status (Heat Recovery)

P48

120

Sys 2 Wye-Delta Relay

P49

121

—

P50

122

S1-1 Cooling Type: 0=Water, 1=Glycol

P51

123

S1-2 Ambient Ctrl: 0=Standard, 1=Low Ambient

P52

124

S1-3 Refrigerant Type: 0=R407c, 1=R-22

P53

125

S1-4 Unit Type: 0=YCWS, 1=YCAS

P54

126

S1-5 Motor Current Averaging: 0=Disabled, 1=Enabled

P55

127

S1-6 Heat recovery: 0=Disabled, 1=Enabled

P56

128

Coded

P57

129

*Sys 1 Fault Code

P58

130

*Sys 2 Operatioanal Code

P59

131

*Sys 2 Fault Code

P60

132

Sys 1 Slide Valve Step

P61

133

Sys 1 Condenser Fan Stages Running (0-6)

P62

134

Sys 2 Slide Valve Step

P63

135

Sys 2 Condenser Fan Stages Running (0-6)

P64

136

Lead Compressor Number

P65

137

Debug Code

*Sys 1 Operational Code

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FORM 201.19-NM1 (204)

TABLE 13 – ISN TRANSMITTED DATA (CONT'D)
ISN
Page

Character

Type

P66

138-141

Analog

P67

142-145

Low Leaving Chilled Liquid Temp Cutout

P68

146-149

Sys 1 EEV Output %

P69

150-153

Sys 2 EEV Output %

P70

154-157

Low Suction Pressure Cutout

P71

158-161

High Discharge Pressure Cutout

P72

162-165

Remote Leaving Chilled Liquid Setpoint

P73

166-169

Sys 1 Suction Superheat

P74

170-173

Cooling Range

P75

174-177

Sys 1 Discharge Superheat

P76

178-181

Sys 2 Suction Temperature

P77

182-185

Sys 2 Discharge Temperature

P78

186-189

Sys 2 Suction Superheat

P79

190-193

Sys 2 Discharge Superheat

P80

194

Digital

P81

195

S1-8 SPARE

P82

196

—

P83

197

—

P84

198

—

YORK INTERNATIONAL

DXST Chiller Data

Leaving Chilled Liquid Setpoint

S1-7 Expansion Valve Type: 0=TXV, 1=EEV

191

Micro Panel Contents

FORM 201.19-NM1 (204)

TABLE 14 – ISN OPERATIONAL AND FAULT CODES
P56/58

C1 Operational Code

P57/59

C1 Fault Code

No Abnormal Condition

No Fault

Unit Switch Off

VAC Under Voltage

System Switch Off

Low Ambient Temperature

Lock - Out

High Ambient Temperature

Unit Fault

Low Leaving Chilled Liquid Temp

System Fault

High Discharge Pressure

Remote Shutdown

High Differential Oil Pressure

Daily Schedule Shutdown

Low Suction Pressure

No Run Permissive
Flow Switch Open (Euro CAT)

High Motor Current

No Cool Load

LLSV Not On

Anti-Coincidence Timer Active

Low Battery Warning

Anti-Recycle Timer Active

High Oil Temperature

Manual Override

High Discharge Temperature

Suction Limiting

Improper Phase Rotation

Discharge Limiting

Low Motor Current / MP / HPCO

Current Limiting

Motor Current Unbalanced

Load Limiting

Low Differential Oil Pressure

Compressor Running

Ground Fault

MP / HPCO

Low Evaporator Temperature

Incorrect Refrigerant Programmed

Power Failure, Manual reset Required

I/O Board Failure

Low Superheat

Sensor Fault

Reprogram Unit Type

MP / HPCO Inhibit

Heat Recovery Select

* The operational and fault codes are defined in table 14. Note that this table of fault and operational codes is for
all DX products. The codes that are grayed out are not used on this unit.

192

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

This page intentionally left blank.

YORK INTERNATIONAL

193

Maintenance

FORM 201.19-NM1 (204)

MAINTENANCE
GENERAL REQUIREMENTS

The units have been designed to operate continuously,
provided they are regularly maintained and operated
within the limitations given in this manual. Each unit
should be included in a routine schedule of daily maintenance checks by the operator/customer, backed up by
regular service inspection and maintenance visits by a
suitably qualified Service Engineer.
It is the responsibility of the owner to provide maintenance on the system.
It is entirely the responsibility of the owner to provide
for these regular maintenance requirements and/or enter
into a maintenance agreement with a York International
service organization to protect the operation of the unit.
If damage or a system failure occurs due to improper
maintenance during the warranty period, YORK shall
not be liable for costs incurred to return the unit to satisfactory condition.

If system failure occurs due to improper maintenance during the warranty
period, YORK will not be liable for
costs incurred to return the system to
satisfactory operation. The following
is intended only as a guide and covers
only the chiller unit components. It
does not cover other related system
components which may or may not be
furnished by YORK. System components should be maintained according to the individual manufacture's
recommendations as their operation
will affect the operation of the chiller.
This maintenance section applies to
the basic unit only and may, on individual contracts, be supplemented by
additional requirements to cover any
modifications or ancillary equipment
as applicable.

194

The Safety Section of this manual
should be read carefully before attempting any maintenance operations
on the unit.
Daily/Weekly Maintenance
The following maintenance checks should be carried
out on a daily/weekly basis by the operator/customer.
Please note that the units are not generally user serviceable and no attempt should be made to rectify faults or
problems found during daily checks unless competent
and equipped to do so. If in any doubt, contact your local
YORK Service Agent.
Unit Status: Press the ‘STATUS’ key on the keypad
and ensure no fault messages are displayed (refer to
the MBCS Manual for explanation of messages and the
Trouble Shooting section for courses of action).
Refrigerant Leaks: Visually check the heat exchangers,
compressors and pipework for damage and gas leaks.
CONDENSER COILS

Dirt and foreign material should not be allowed to accumulate on the condenser coil surfaces. Cleaning should
be as often as necessary to keep coil clean.

Exercise care when cleaning the coil
so that the coil fins are not damaged.

Operating conditions: Read the operating pressures and
temperatures at the control panel using the display keys
and check that these are within the operating limitations
in this Manual.
Compressor oil level: Check the compressor oil level
after the compressor has been operating on ‘FULL
LOAD’ for approximately half an hour. The oil level
should be visible in the upper of the two sight glasses.
When the compressor is operating at ‘PART LOAD’,
the level may fall as far as half way down the lower
sight glass but should not fall below this level. When
the compressor returns to full load the level will return
to the upper sight glass. If oil is added, be aware it is

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

"L" Type POE oil. Always add oil from a new unopened
container. Dispose of the remaining oil using environmentally friendly procedures.
Refrigerant charge: When a system starts up, or sometimes after a change of capacity, a flow of bubbles will
be seen in the liquid line sight glass. After a few minutes
of stable operation, the bubbles should clear, leaving
just liquid refrigerant showing in the sight glass.

The unit evaporator heater is 120VAC.
Disconnecting 120VAC power from the
unit, at or below freezing temperatures,
can result in damage to the evaporator and unit as a result of the chilled
liquid freezing.

OVERALL UNIT INSPECTION

Chiller / Compressor Operating Log
A Chiller/Compressor Operating Log is supplied on
the following page for logging compressor and chiller
operating data.
Regular checks of the system should be preformed to
ensure that operating temperatures and pressures are
within limitations, and that the operating controls are set
within proper limits. Refer to the Operation, Start-Up,
and Installation sections of this manual.

In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure proper equipment operation. Items such as
loose hardware, component operation, refrigeration
leaks, unusual noises, etc. should be investigated and
corrected immediately.

Scheduled Maintenance
The maintenance operations detailed in the table following the Operating Log Form should be carried out on a
regular basis by a suitably qualified Service Engineer.
It should be noted that the interval necessary between
each ‘minor’ and ‘major’ service can vary depending on,
for instance, application, site conditions and expected
operating schedule. Normally a ‘minor’ service should
be carried out every three to six months and a ‘major’
service once a year. It is recommended that your local
YORK Service Center is contacted for recommendations
for individual sites.

ON-BOARD BATTERY BACK-UP

U17 is the Real Time Clock chip that maintains the date/
time and stores customer programmed setpoints. Anytime the chiller is to be off (no power to the microboard)
for an extended time (weeks/months), the clock should
be turned off to conserve power of the on-board battery.
To accomplish this, the J11 jumper on the microboard
must be moved to the "CLKOFF" position while power
is still supplied to the microboard.

YORK INTERNATIONAL

195

Compressor

Evap.

Note: Temperature and Pressure Units in °F and PSIG respectively unless otherwise noted.

Remarks:

Condenser

Oil
Sep.

Brine

Air

Water

196

Date
Time
Hour Meter Reading
Equipment Room Temp./Outdoor Temp.
Suction Pressure
Suction Temperature
Suction Superheat
Discharge Pressure
Actual Discharge Temperature
Oil Pressure
Oil Temperature
FLA %
(Motor )
Oil Level (example
)
Oil Added (gallons or liters)
Inlet Temperature
Outlet Temperature
Pressure Drop
Flow Rate - GPM or l/s
Air On Temperature
Air Off Temperature
Inlet Temperature
Outlet Temperature
Pressure Drop
Flow Rate - GPM or l/s
Leaving Liquid Refrigerant Temperature
/

CHILLER/COMPRESSOR
Operating Log

YORK Order No. ________________________
Compr. Ser. No. _________________________
Unit Ser. No. ___________________________
Refrigerant_____________________________

Maintenance
FORM 201.19-NM1 (204)

COMPRESSOR UNIT OPERATION

Operating Log

YORK INTERNATIONAL

Record system operating pressures and temperatures

QUARTERLY

SEMI-ANNUALLY

YEARLY

EVERY
___
* HOURS

This procedure must be performed at the specified time interval by an Industry Certified Technician who has been trained and qualified to work on this type of YORK
equipment. A record of this procedure being successfully carried out must be maintained on file by the equipment owner should proof of adequate maintenance
be required at a later date for warranty validation purposes.

* Reserved for customer use for any special site determined requirements.

power wiring connections1

Disconnect power source and lock out; Check tightness of

Leak check the chiller

Sample compressor oil and replace oil if necessary1

Check compressor and evaporator heaters for operation

TXV’s; Check condenser and economizer subcooling1

Check compressor superheat on evaporator and economizer

Check condenser coils for dirt/debris and clean if necessary

and assure they are correct for particular application.
X

Check programmable operating setpoints and safety cutouts

Check liquid line sight glass / moisture indicator

WEEKLY

Check oil level in oil separator sight glass

PROCEDURE

MAINTENANCE REQUIREMENTS FOR YORK YCAS SCREW CHILLERS

FORM 201.19-NM1 (204)

197

Maintenance

FORM 201.19-NM1 (204)

GENERAL PERIODIC MAINTENANCE CHECKS
STANDARD UNITS
SERVICE SCHEDULE

MINOR SERVICE

Unit general:

Check thermal insulation.
Check vibration isolators.
Check relief valves.
Check fusible plugs.
Check for pipework damage.
Check for leaks.
Check moisture indicator.
Check suction superheat.
Check economizer superheat.
Check liquid subcooling.
Check oil level.
Check oil pressure.
Check slide valve operation.
Check compressor heater.
Check condition of oil.
Check discharge superheat.
Check water flow.
Check water pressure drop.
Check heater.
Check for airflow obstructions.

Refrigerant systems general:

Compressors / Oil separator:

Evaporator

Air cooled condensers:

Power & Control system general:

Microprocessor controls:

198

Check fins.
Check fans and fan guards.
Check panel condition.
Check mains and control wiring.
Check sensor location.
Check mechanical HP cutouts.
Check emergency stop.
Check overload devices.
Check fault history.
Check program settings.
Check HP / LP cutout functions
Check pump-down function.
Check load / unload function.

MAJOR SERVICE
All items under Minor Service plus:
Check main structure.
Check paint-work.
Check solenoid valves.

Check water pH / glycol strength.

Brush fins. Clean with mild, low
pH cleaner.
Check fan motor bearings.
Check all connections.
Check compressor contactors.
Check fan contactors / overloads.
Check sensor / transducer calibration.
Check motor protectors.
Check fan control function.
Check ambient cut-out function.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

SPARE PARTS
Recommended Spares
It is recommended that the following common spare
parts are held for preventative of corrective maintenance
operations.
Description

For Parts, Service, or Sales,
Call Toll Free:
1-866-YORK SRV
(1-866-9675-778)

Part Number

Pressure Transducer 200PSI (14 Bar)

025-29583-000

Pressure Transducer 400PSI (28 Bar)

025-29139-001

Sensor, High Temperature

025-30440-000

Sensor, Ambient Temperature

025-28663-001

Sensor, Water Temperature

025-29964-000

Sensor, Water Temperature

025-29964-000

Oil Filter

026-35601-000

O-Ring

028-13849-000

Other spare parts vary depending on the unit model.
Review the chiller Renewal Parts Manual or Contact
your local YORK Sales and Ser vice Center for
information (Please quote the unit model number and
serial number).
When ordering spare parts, we will require the following
information to ensure the correct parts are supplied:
Full unit model number, serial number, application and
details of the parts required.
All requests for parts should be made to your local
YORK Sales and Service Center.
Recommended Compressor Oils

The correct type of oil must be used in the unit as shown
on the unit data plate and labels. Standard units use the
following oils:
REFRIGERANT
R-22 and R407C

COMPRESSOR OIL
YORK Type L
(5 Gal: 011-00592-000)

The oil utilized is a POE oil. Once a
container is opened, it quickly absorbs
moisture. Any unused oil should be
disposed of using environmentally
friendly procedures.

YORK INTERNATIONAL

199

Troubleshooting

FORM 201.19-NM1 (204)

TROUBLESHOOTING GUIDE
PROBLEM
No display on panel unit will not start

POSSIBLE CAUSE
Main supply to control system OFF.
Emergency stop device off.

CB3 tripped.
No supply to - T2.
No 24VAC supply to power board.
No +12V output from powerboard.
NO RUN PERM displayed
(No run permissive)

No liquid flow through the evaporator.
Flow switch or cycling contacts are
Flow
switch contacts are not made.
not
made.

SYS # HIGH OIL TEMP

Chiller FAULT: LOW
AMBIENT TEMP displayed

Chiller FAULT: HIGH
AMBIENT TEMP displayed

Poor airflow through the condenser
coils.
Measured temperature incorrect.
Ambient air temperature is lower
than the programmed operating
limit.

Measured temperature is incorrect.
Ambient air temperature is higher
than the programmed operating limit.

Recirculated
is affecting
the sensor.
Resid. heat air
is not
being dissipated.

Chiller FAULT: LOW
WATER TEMP displayed

Measured temperature is incorrect.
Leaving liquid drops below the
programmed low limit faster than the
unit can unload.
Unit is not unloading.
Measured temperature is incorrect.

Chiller FAULT: VAC
UNDERVOLTAGE
displayed.

200

Poor main supply voltage.

ACTION POSSIBLE CAUSE
ACTION
Switch on main supply if safe to do so.
Check if control panel emergency stop switch
and any remote emergency stop devices are in
the OFF position. Turn to ON position (1) if safe
to do so.
Check CB3.
Check 115VAC to L & 2.
Check wiring from - T2 to powerboard and fuse.
Replace powerboard or isolate excessive load on
the board.
Ensure that liquid pumps are running. Valves are
correctly set and flow is established.
Check that the flow switch is functional and is
installed according to the manufacturer’s instructions.
Check cycling contacts.
Check for airflow restrictions caused by blockages on
intake faces of air coils.
Check oil temp sensor and wiring.
Use the ‘ambient temp.’ key to display the
temperature and confirm that the displayed value is
approximately correct. The warning message should
clear when the ambient air temperature rises above
the programmed operating limit.
Check the programmed settings are correct for the
options fitted to the unit.
Check ambient sensor and wiring.
Use the ‘ambient temp.’ key to display the
temperature and confirm that the displayed value is
approximately correct. The warning message should
clear when the ambient air temperature falls below
the programmed operating limit.
Check that the programmed settings are correct for
the options fitted to the unit.
Check fans are operating correctly and the rotation is
correct. Check for airflow recirculation.
Check ambient sensor and wiring.
Check for restrictions in the liquid flow line.
Check that the liquid flow is stable.
Check the voltage to the unloader valve solenoid.
Check that the compressor unloads correctly.
Check water temp sensor and wiring.
Check main supply is stable and within allowable
limits.
Check for voltage dip on compressor start.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TROUBLESHOOTING GUIDE - CONT’D
PROBLEM

POSSIBLE

ACTION

Poor airflow through condenser
coils.

Check for airflow restrictions caused by blockages
on intake faces of air coils.
Check for damaged fins/return bends.
Check for correct fan operation and direction of
rotation.
Check for non-condensables (air) in system.

Excessive refrigerant charge.

Check that the sub-cooling is correct.

Measured pressure is incorrect.

Check discharge transducer and wiring.

Suction superheat too high.

Check suction superheat is within range.

Poor airflow through the condenser
coils.

Check for airflow restrictions caused by blockages
on intake faces of air coils.

Measured temperature incorrect.

Check discharge sensor calibration, location and
wiring.

SYS # DSCH LIMITING
displayed (Discharge pressure unloading)

Discharge pressure unloading due
to unit operating above load limit.
See also SYS # HIGH DSCH.

Check chilled liquid temperature is within range.
Check fan operation.
Check if ambient air temperature is above design
conditions.
Check programmed unload point.

SYS # HIGH OIL PRESS
DIFF is displyed. (High oil
differential pressure.)

Ball valve in oil circuit closed.

Check ball valves are open position.

Dirty / blocked oil filter.

Check and change oil filter cartridge.

SYS # LOW SUCTION
displayed

Badly adjusted or faulty expansion
valve.

Check superheat.

Reduced evaporator performance.

Check for restricted chilled liquid flow.
Check for fouled tube surfaces.
Check superheat.

Low refrigerant charge.

Check subcooling is correct.
Check for leaks.

Restricted refrigerant flow.

Check for blocked filter / drier.
Check LLSV is opening correctly.

Measured pressure incorrect.

Check suction pressure transducer and wiring.

Compressor current too low.

Check the compressor main supply voltage, fuses,
contactors and wiring. Check main supply voltage is
within tolerance. Check 2ACE MP fault code.

Measured current is incorrect.

Check for defective Motor Protector Module.

Compressor motor protector signal
failure.

Check motor protector and wiring.

Mechanical high pressure cut-out
trip.

Check compressor discharge valve is open.
Check cut-out and wiring.

No motor cooling.

Check superheat.
Check operation of economizer, TXV, and liquid
solenoid valve.

High compressor motor current
has activated unloading.

Check if liquid temperature is within operating limits.
Check if ambient air temperature is above operating
limits.

SYS # HIGH DSCH
displayed (High discharge
pressure trip)

SYS # HIGH DSCH TEMP
displayed (High discharge
temperature)

SYS # LOW CURR/MP/HP
displayed

SYS # CURR LIMITING
displayed
(Compressor current unloading.)

YORK INTERNATIONAL

201

Troubleshooting

FORM 201.19-NM1 (204)

LIMITED WARRANTY YORK AMERICAS ENGINEERED SYSTEMS
WARRANTY ON NEW EQUIPMENT
York International Corporation (“YORK”) warrants all equipment and associated factory supplied materials, or startup services performed by YORK in connection therewith,
against defects in workmanship and material for a period
of eighteen (18) months from date of shipment. Subject to
the exclusions listed below, YORK, at its option, will repair
or replace, FOB point of shipment, such YORK products
or components as it finds defective.
Exclusions: Unless specifically agreed to in the contract
documents, this warranty does not include the following
costs and expenses:
1. Labor to remove or reinstall any equipment, materials,
or components.
2. Shipping, handling, or transportation charges.
3. Cost of refrigerants.
No warranty repairs or replacements will be made until
payment for all equipment, materials, or components has
been received by YORK.

ALL WARRANTIES AND GUARANTEES ARE VOID IF:
1. Equipment is used with refrigerants, oil, or antifreeze
agents other than those authorized by YORK.
2. Equipment is used with any material or any equipment
such as evaporators, tubing, other low side equipment,
or refrigerant controls not approved by YORK.
3. Equipment has been damaged by freezing because
it is not properly protected during cold weather, or
damaged by fire or any other conditions not ordinarily
encountered.
4. Equipment is not installed, operated, maintained and
serviced in accordance with instructions issued by
YORK.
5. Equipment is damaged due to dirt, air, moisture, or
other foreign matter entering the refrigerant system.
6. Equipment is not properly stored, protected or inspected by the customer during the period from date
of shipment to date of initial start.
7. Equipment is damaged due to acts of God, abuse,
neglect, sabotage, or acts of terrorism.

WARRANTY ON RECONDITIONED OR
REPLACEMENT MATERIALS
Except for reciprocating compressors, which YORK warrants for a period of one year from date of shipment, YORK
warrants reconditioned or replacement materials, or startup services performed by YORK in connection therewith,
against defects in workmanship or material for a period
of ninety (90) days from date of shipment. Subject to the
exclusions listed below, YORK, at its option, will repair or
replace, FOB point of shipment, such materials or parts as
YORK finds defective. However, where reconditioned or
replacement materials or parts are placed on equipment
still under the original new equipment warranty, then such
reconditioned or replacement parts are warranted only until
the expiration of such original new equipment warranty.
Exclusions: Unless specifically agreed to in the contract
documents, this warranty does not include the following
costs and expenses:
1. Labor to remove or reinstall any equipment, materials,
or components.
2. Shipping, handling, or transportation charges.
3. Cost of refrigerant.
No warranty repairs or replacements will be made until
payment for all equipment, materials, or components has
been received by YORK.

202

THIS WARRANTY IS IN LIEU OF ALL OTHER
WARRANTIES AND LIABILITIES, EXPRESS OR
IMPLIED IN LAW OR IN FACT, INCLUDING THE
WAR RAN TIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE. THE
WARRANTIES CONTAINED HEREIN SET FORTH
BUYER’S SOLE AND EXCLUSIVE REMEDY IN
THE EVENT OF A DEFECT IN WORKMANSHIP
OR MATERIALS. IN NO EVENT SHALL YORK’S
LIABILITY FOR DIRECT OR COMPENSATORY
DAMAGES EXCEED THE PAYMENTS RECEIVED
BY YORK FROM BUYER FOR THE MATERIALS
OR EQUIPMENT INVOLVED. NOR SHALL YORK
BE LIABLE FOR ANY SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES. THESE LIMITATIONS ON LIABILITY AND DAMAGES SHALL
APPLY UNDER ALL THEORIES OF LIABILITY
OR CAUSES OF ACTION, INCLUDING, BUT
NOT LIMITED TO, CONTRACT, WARRANTY,
TORT (INCLUDING NEGLIGENCE) OR STRICT
LIABILITY. THE ABOVE LIMITATIONS SHALL INURE TO THE BENEFIT OF YORK’S SUPPLIERS
AND SUBCONTRACTORS.

YORK INTERNATIONAL

FORM 201.19-NM1 (204)

TEMPERATURE CONVERSION CHART
Temperature Conversion Chart Actual Temperatures
°F
0
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60
64
68
72
76
80
84
88
92
96
100
104
108
112
116
120
124
128
132
136
140
144
148
152
156
160
164
168
172
176
180
184
188
192
196
200
204
208
212
216
220
224
228
232
236
240
244

°C
-17.8
-15.6
-13.3
-11.1
-8.9
-6.7
-4.4
-2.2
0.0
2.2
4.4
6.7
8.9
11.1
13.3
15.6
17.8
20.0
22.2
24.4
26.7
28.9
31.1
33.3
35.6
37.8
40.0
42.2
44.4
46.7
48.9
51.1
53.3
55.6
57.8
60.0
62.2
64.4
66.7
68.9
71.1
73.3
75.6
77.8
80.0
82.2
84.4
86.7
88.9
91.1
93.3
95.6
97.8
100.0
102.2
104.4
106.7
108.9
111.1
113.3
115.6
117.8

YORK INTERNATIONAL

°C
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
102
104

Temperature Conversion Chart Differential Temperatures
°F
-0.4
3.2
6.8
10.4
14
17.6
21.2
24.8
28.4
32
35.6
39.2
42.8
46.4
50
53.6
57.2
60.8
64.4
68
71.6
75.2
78.8
82.4
86
89.6
93.2
96.8
100.4
104
107.6
111.2
114.8
118.4
122
125.6
129.2
132.8
136.4
140
143.6
147.2
150.8
154.4
158
161.6
165.2
168.8
172.4
176
179.6
183.2
186.8
190.4
194
197.6
201.2
204.8
208.4
212
215.6
219.2

°F
0
4
8
12
16
20
24
28
32
36
40
44
48
52
56
60

°C
0
2.2
4.4
6.7
8.9
11.1
13.3
15.6
17.8
20
22.2
24.4
26.7
28.9
31.1
33.3

°C
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30

°F
0
3.6
7.2
10.8
14.4
18
21.6
25.2
28.8
32.4
36
39.6
43.2
46.8
50.4
54

Pressure Conversion Chart Gauge or Differential
PSI
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400

BAR
1.38
2.07
2.76
3.45
4.14
4.83
5.52
6.21
6.9
7.59
8.28
8.97
9.66
10.34
11.03
11.72
12.41
13.1
13.79
14.48
15.17
15.86
16.55
17.24
17.93
18.62
19.31
20
20.69
21.38
22.07
22.76
23.45
24.14
24.83
25.52
26.21
26.9
27.59

BAR
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
13
13.5
14
14.5
15
15.5
16
16.5
17
17.5
18
18.5
19
19.5
20
20.5

PSI
21.8
29
36.3
43.5
50.8
58
65.3
72.5
79.8
87
94.3
101.5
108.8
116
123.3
130.5
137.8
145
152.3
159.5
166.8
174
181.3
188.5
195.8
203
210.3
217.5
224.8
232
239.3
246.5
253.8
261
268.3
275.5
282.8
290
297.3

203

Tele. 800-861-1001
www.york.com

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York Millennium Ycas0130 Users Manual 201.19 NM1 (204)

YCAS0130 to the manual b18cdb57-ee24-40f9-96ff-0a7163391231

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