York R123 Users Manual 160.55 O1

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2015-02-02

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MILLENNIUM ®
CENTRIFUGAL LIQUID CHILLERS
OPERATING & MAINTENANCE

Supersedes: 160.55-O1 (402)

Form 160.55-O1 (604)

MODEL YT (STYLE J)
R123 COOLING ONLY
WITH OPTIVIEW™ CONTROL CENTER
FOR ELECTRO-MECHANICAL STARTER,
SOLID STATE STARTER & VARIABLE SPEED DRIVE

29509A

FORM 160.55-O1 (604)

YORK INTERNATIONAL

FORM 160.55-O1 (604)

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
environmental 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 160.55-O1 (604)

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.
While YORK makes no commitment to update or
pro vide current in for ma tion automatically to the
manual owner, that information, if applicable, can
be obtained by contacting the nearest YORK Applied
Systems Service ofÞce.

It is the responsibility of operating/service personnel
as to the applicability of these documents to the equipment in question. If there is any question in the mind
of operating/service personnel as to the applicability of
these documents, then, prior to working on the equipment, they should verify with the owner whether the
equipment has been modiÞed and if current literature
is available.

REFERENCE INSTRUCTIONS
DESCRIPTION

FORM NO.

SOLID STATE STARTER (MOD “A”) – OPERATION & MAINTENANCE

160.46-OM3.1

SOLID STATE STARTER (MOD “B”) – OPERATION & MAINTENANCE

160.00-02

VARIABLE SPEED DRIVE – OPERATION

160.00-O1

VARIABLE SPEED DRIVE – SERVICE INSTRUCTIONS

160.00-M1

INSTALLATION

160.55-N1

OPTIVIEW CONTROL CENTER - SERVICE INSTRUCTIONS

160.55-M1

WIRING DIAGRAM – UNIT WITH ELECTRO-MECHANICAL STARTER

160.55-PW1

WIRING DIAGRAM – UNIT WITH SOLID STATE STARTER (MOD “B”)

160.55-PW2

WIRING DIAGRAM – UNIT WITH VARIABLE SPEED DRIVE

160.55-PW3

RENEWAL PARTS – UNIT

160.48-RP5

RENEWAL PARTS – GRAPHIC CONTROL CENTER

160.55-RP1

NOMENCLATURE
The model number denotes the following characteristics of the unit

Model

—

Design Level

Cooler Code
Condenser Code
Compressor Code

Motor Code
Power Supply
— for 60 Hz
5 for 50 Hz

YORK INTERNATIONAL

FORM 160.55-O1 (604)

TABLE OF CONTENTS

SECTION

Description of System and Fundamentals of Operation............................... 7

SECTION

OptiView Control Center ............................................................................. 9

SECTION

Printers ..................................................................................................... 112

SECTION

System Operating Procedures .................................................................. 124

SECTION

System Components Description ............................................................. 131

SECTION

Operational Maintenance ......................................................................... 135

SECTION

Troubleshooting........................................................................................ 138

SECTION

Maintenance ............................................................................................. 144

SECTION

Preventive Maintenance ........................................................................... 152

SECTION

OptiSave Energy Analyser Feature .......................................................... 154

YORK INTERNATIONAL

FORM 160.55-O1 (604)

LIST OF FIGURES
FIG. 1

– MODEL YT MILLENNIUM CHILLER .................... 7

FIG. 33 – HISTORY SCREEN............................................ 76

FIG. 2

– REFRIGERANT FLOW-THROUGH CHILLER ..... 8

FIG. 34 – HISTORY DETAILS SCREEN ............................ 78

DETAIL A – COMPRESSOR PREROTATION
VANES.................................................................. 8

FIG. 35 – SECURITY LOG SCREEN................................. 79

FIG. 3

– CONTROL CENTER .......................................... 12

FIG. 4

– HOME SCREEN................................................. 16

FIG. 5

– SYSTEM SCREEN............................................. 18

FIG. 6

– EVAPORATOR SCREEN ................................... 20

FIG. 7

– CONDENSER SCREEN..................................... 22

FIG. 8

– PURGE SCREEN............................................... 24

FIG. 9

– REFRIGERANT LEVEL CONTROL SCREEN ... 26

FIG. 10 – COMPRESSOR SCREEN.................................. 28
FIG. 11 – HOT GAS BYPASS SCREEN ............................ 30
FIG. 12 – SURGE PROTECTION SCREEN ...................... 32
FIG. 13 – PRE-ROTATION VANES CALIBRATION
SCREEN............................................................. 36
FIG. 14 – VSD TUNING SCREEN ..................................... 38
FIG. 15 – OIL SUMP SCREEN........................................... 40
FIG. 16 – ELECTRO-MECHANICAL STARTER SCREEN 41
FIG. 17 – SOLID STATE STARTER
(MOD A) SCREEN.............................................. 42
FIG. 18 – SOLID STATE STARTER
(MOD B) SCREEN ............................................. 44
FIG. 19 – VARIABLE SPEED DRIVE SCREEN ................. 46
FIG. 20 – VARIABLE SPEED DRIVE DETAILS SCREEN
(All VSD except Part Number 371-02767-XXX
(60 Hz) or 371-03700-XXX (50 Hz)) ................... 48
FIG. 21 –

VARIABLE SPEED DRIVE DETAILS SCREEN
(VSD with Part Number 371-02767-XXX
(60 Hz) or 371-03700-XXX (50 Hz)) ................... 50

FIG. 22 – ADAPTIVE CAPACITY CONTROL DETAILS
SCREEN............................................................. 52
FIG. 23 – HARMONIC FILTER DETAILS SCREEN
(All VSD except Part Number 371-02767-XXX
(60 Hz) or 371-03700-XXX (50 Hz)) ................... 54
FIG. 24 – HARMONIC FILTER DETAILS SCREEN
(VSD with Part Number 371-02767-XXX (60 Hz)
or 371-03700-XXX (50 Hz))................................ 56
FIG. 25 – SETPOINTS SCREEN ....................................... 58
FIG. 26 – SETUP SCREEN................................................ 60
FIG. 27 – SCHEDULE SCREEN ........................................ 64
FIG. 28 – USER SCREEN.................................................. 66
FIG. 29 – COMMS SCREEN.............................................. 68
FIG. 30 – PRINTER SCREEN............................................ 70
FIG. 31 – SALES ORDER SCREEN .................................. 72
FIG. 32 – OPERATIONS SCREEN .................................... 74

FIG. 36 – SECURITY LOG DETAILS SCREEN ................. 80
FIG. 37 – TREND SCREEN ............................................... 82
FIG. 38 – TREND SETUP SCREEN .................................. 84
FIG. 39 – ADVANCED TREND SETUP SCREEN.............. 86
FIG. 40 – COMMON SLOTS SCREEN .............................. 88
FIG. 41 – CUSTOM VIEW SCREEN.................................. 89
FIG. 42 – CUSTOM VIEW SETUP SCREEN ..................... 90
FIG. 43 – PRINTERS ........................................................112
FIG. 44 – SAMPLE PRINTOUT (STATUS)........................116
FIG. 45 – SAMPLE PRINTOUT (SETPOINTS) .................110
FIG. 46 – SAMPLE PRINTOUT (SCHEDULE)..................119
FIG. 47 – SAMPLE PRINTOUT (SALES ORDER)........... 120
FIG. 48 – SAMPLE PRINTOUT (HISTORY) .................... 121
FIG. 49 – SAMPLE PRINTOUT (SECURITY LOG).......... 122
FIG. 50 – SAMPLE PRINTOUT (TREND) ........................ 123
FIG. 51 – SAMPLE PRINTOUT
(CUSTOM SCREEN REPORT)........................ 123
FIG. 52 – SAMPLE PRINTOUT
(ADAPTIVE CAPACITY CONTROL NEW MAP
POINT REPORT) ............................................ 123
FIG. 53 – SAMPLE PRINTOUT
(ADAPTIVE CAPACITY CONTROL EXISTING
MAP POINTS REPORT) .................................. 123
FIG. 54 – OPERATION SEQUENCE & TIMING
DIAGRAM (ELECTRO-MECHANICAL
& SOLID STATE STARTER APPLICATIONS) .. 126
FIG. 55 – OPERATION SEQUENCE & TIMING
DIAGRAM (COMPRESSOR MOTOR
VARIABLE SPEED DRIVE APPLICATIONS) ... 126
FIG. 56 – MINIMUM ENTERING CONDENSING
WATER TEMPERATURE ................................. 127
FIG. 57 – LIQUID CHILLER LOG SHEETS ..................... 127
FIG. 58 – TURBOGUARD PURGE UNIT......................... 129
FIG. 59 – SCHEMATIC DRAWING (YT) COMPRESSOR
LUBRICATION SYSTEM.................................. 132
FIG. 60 – OIL RETURN SYSTEM .................................... 135
FIG. 61 – ASSEMBLY OF DEHYDRATOR....................... 136
FIG. 62 – CHARGING OIL RESERVOIR WITH OIL ........ 137
FIG. 63 – EVACUATION OF CHILLER ............................ 145
FIG. 64 – SATURATION CURVE ..................................... 147
FIG. 65 – DIAGRAM - MEGGING MOTOR WINDINGS .. 149
FIG. 66 – MOTOR STATOR TEMPERATURE &
INSULATION RESISTANCES .......................... 150
YORK INTERNATIONAL

FORM 160.55-O1 (604)

SECTION 1
DESCRIPTION OF SYSTEM AND FUNDAMENTALS OF OPERATION
COMPRESSOR

PURGE
UNIT

CONTROL
CENTER

MOTOR

CONDENSER

29509A

FIG. 1 – MODEL YT MILLENNIUM CHILLER
SYSTEM OPERATION DESCRIPTION (SEE FIG. 2)

The YORK Model YT Millennium Chiller is commonly
applied to large air conditioning systems, but may be
used on other applications. The chiller consists of an
open motor mounted to a compressor (with integral
speed increasing gears) condenser, cooler and variable
ßow control.
The chiller is controlled by a modern state of the art
OptiView Control Center that monitors its operation. The
Control Center is programmed by the operator to suit job
speciÞcations. Automatic timed start-ups and shutdowns
are also programmable to suit nighttime, weekends and
holidays. The operating status, temperatures, pressures
and other information pertinent to operation of the chiller
are automatically displayed and read on a graphic message display. Other displays can be observed by pressing
the keys as labeled on the Control Center. The chiller
with the OptiView Control Center is applied with an
electro-mechanical starter, YORK Solid State Starter
(optional) or Variable Speed Drive (optional).
There could be either of two different Solid State Starters applied. New production chillers are equipped with
the Mod “B” Solid State Starter. This starter contains a
YORK INTERNATIONAL

COOLER

combination Logic/Trigger Board that interfaces the
Control Center with a serial communications link. Earlier vintage chillers, such as those encountered in Control
Center retroÞt applications are equipped with the Mod
“A” starter. This Starter contains a Trigger Board that
interfaces to a Logic Board that is installed inside of the
Control Center.
In operation, a liquid (water or brine to be chilled) ßows
through the cooler, where boiling refrigerant absorbs heat
from the liquid. The chilled liquid is then piped to fan
coil units or other air conditioning terminal units, where
it ßows through Þnned coils, absorbing heat from the
air. The warmed liquid is then returned to the chiller to
complete the chilled liquid circuit.
The refrigerant vapor, which is produced by the boiling
action in the cooler, ßows to the compressor where the
rotating impeller increases its pressure and temperature
and discharges it into the condenser. Water ßowing
through the condenser tubes absorbs heat from the refrigerant vapor, causing it to condense. The condenser water
is supplied to the chiller from an external source, usually
a cooling tower. The condensed refrigerant drains from
the condenser into the liquid return line, where the vari7

Description of System and Fundamentals of Operation
FORM 160.55-O1 (604)

able oriÞce meters the ßow of liquid refrigerant to the
cooler to complete the refrigerant circuit.
The major components of a chiller are selected to handle
the refrigerant, which would be evaporated at full load
design conditions. However, most systems will be called
upon to deliver full load capacity for only a relatively
small part of the time the unit is in operation.
CAPACITY CONTROL

The major components of a chiller are selected for full
load capacities, therefore capacity must be controlled
to maintain a constant chilled liquid temperature leaving the cooler. Prerotation vanes (PRV), located at the
entrance to the compressor impeller, compensate for
variation in load (See Fig. 2, Detail A).
7619A(D)

DETAIL A – COMPRESSOR PREROTATION VANES

The position of these vanes is automatically controlled
through a lever arm attached to an electric motor located
outside the compressor housing. The automatic adjustment of the vane position in effect provides the performance of many different compressors to match various
load conditions from full load with vanes wide open to
minimum load with vanes completely closed.

COMPRESSOR

PREROTATION VANES
(See Detail A)

DISCHARGE
SUCTION

DISCHARGE
BAFFLE
COOLER
CONELIMINATOR
SUB-COOL-

FLOW CONTROL
LD00924

FIG. 2 – REFRIGERANT FLOW-THRU CHILLER
8

OIL COOLER
YORK INTERNATIONAL

FORM 160.55-O1 (604)

SECTION 2
OPTIVIEW CONTROL CENTER
INTRODUCTION
The YORK OptiView Control Center is a microprocessor based control system for R-11 or R123 centrifugal
chillers. It controls the leaving chilled liquid temperature
via pre-rotation vane controls and has the ability to limit
motor current via control of the pre-rotation vanes. It is
compatible with YORK Solid State Starter (optional),
Variable Speed Drive (optional) and Electro-Mechanical
starter applications.
The panel comes conÞgured with a full screen LCD
Graphic Display mounted in the middle of a keypad
interface. The graphic display allows the presentation
of several operating parameters at once. In addition,
the operator may view a graphical representation of the
historical operation of the chiller as well as the present
operation. For the novice user, the locations of various
chiller parameters are clearly and intuitively marked.
Instructions for speciÞc operations are provided on
many of the screens.
The graphic display also allows information to be represented in both English (temperatures in °F and pressures
in PSIA) and Metric (temperatures in °C and pressures in
kPa) mode. The advantages are most apparent, however,
in the ability to display many languages.
The Control Center continually monitors the system operation and records the cause of any shutdowns (Safety,
Cycling or Normal). This information is recorded in
memory and is preserved even through a power failure
condition. The user may recall it for viewing at any
time. During operation, the user is continually advised
of the operating conditions by various status and warning
messages. In addition, it may be conÞgured to notify the
user of certain conditions via alarms. A complete listing
of shutdown, status and warning messages is attached in
the Display Messages section of this book.
There are certain screens, displayed values, programmable Setpoints and manual control shown in this book
that are for Service Technician use only. They are only
displayed when logged in at SERVICE access level
or higher. The Setpoints and parameters displayed on
these screens are explained in detail in YORK Service
Manual 160.55-M1. These parameters affect chiller
operation and should NEVER be modified by anyone
other than a qualified Service Technician. They are
shown in this book for reference only.
YORK INTERNATIONAL

Advanced Diagnostics and troubleshooting information
for Service Technicians are included in YORK Service
Manual 160.55-M1. Also included in the Service manual are detailed descriptions of chiller features, such as
the Refrigerant Level Control (Future), Purge system,
Hot Gas Bypass, Remote Setpoints and Smart Freeze
Protection.
The control center expands the capabilities of remote
control and communications. By providing a common
networking protocol through the ISN GPIC YORK
Chillers not only work well individually, but also as
a team. This new protocol allows increased remote
control of the chiller, as well as 24-hour performance
monitoring via a remote site. In addition, compatibility
is maintained with the present network of ISN communications. The chiller also maintains the standard digital
remote capabilities as well. Both of these remote control
capabilities allow for the standard Energy Management
System (EMS) interface:
1. Remote Start
2. Remote Stop
3. Remote Leaving Chilled Liquid Temperature
Setpoint adjustment (0-20mA or 4-20mA, 0-10VDC
or 2-10VDC) or Pulse Width Modulation
4. Remote Current Limit Setpoint adjustment (0-20mA
or 4-20mA, 0-10VDC or 2-10VDC) or Pulse Width
Modulation
5. Remote “Ready to Start” Contacts
6. Safety Shutdown Contacts
7. Cycling Shutdown Contacts
The chiller operating program resides in the Optiview
control center Microboard. The control center could be
equipped with either of the following Microboards:
• 031-01730-000 – shipped in new production chillers until September 2003. The program resides in
a replaceable Flash Memory Card. The software
version (C.MLM.02.xx.yzz) is printed on label
adhered to card. Program can be upgraded by
replacing the card.
• 031-02430-000 – shipped in new production chillers after September 2003. The program resides in
non-removable onboard memory. The software
9

Description of System and Fundamentals of Operation
FORM 160.55-O1 (604)

version is C.OPT.02.xx.yzz, and is viewable on
the DIAGNOSTICS Screen in SERVICE access
level. The program can be upgraded by downloading a new program from a Program Card. Program
Cards are shirt-pocket-size portable memory storage devices available from YORK.
Earlier vintage chillers could be equipped with a later
Microboard due to service replacement.

Throughout this book, reference is made to functions and
features that are only available in certain Flash Memory
Card revision levels (C.MLM.02.xx.xxx). To cross reference C.MLM software to C.OPT software, refer to the
controls revision level. Software version
C.OPT.02.04B.xxx is of the same controls revision
level as C.MLM.02.04.xxx. From this starting point,
both receive the same updates at each revision. Software upgrades should only be performed by a Service
Technician.

Software versions (C.MLM.02.xx.yzz or
C.OPT.02.xx.yzz) are alpha-numeric codes that represent the application, language package and revision
levels per below. Each time the controls portion or language section is revised, the respective revision level
increments.
• C – Commercial chiller
• MLM – Used on Microboard 031-01730000
• OPT - Used on Microboard 031-02430000
• 02 – YT chiller
• xx - controls revision level (00, 01, etc)
• y – language package (0=English only,
1=NEMA, 2=CE, 3=NEMA/CE )
• zz – language package revision level (00,
01, etc)

YORK INTERNATIONAL

FORM 160.55-O1 (604)

THIS PAGE INTENTIONALLY LEFT BLANK
TO MAINTAIN FORMAT

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

CONTROL CENTER

FIG. 3

The OptiView Control Center display is highlighted by a
full screen graphics display. This display is nested within
a standard keypad and is surrounded by “soft” keys
which are redeÞned based on the currently displayed
screen. Eight buttons are available on the right side of the
panel and are primarily used for navigation between the
system screens. At the base of the display are 5 additional
buttons. The area to the right of the keypad is used for
data entry with a standard numeric keypad provided for
entry of system setpoints and limits.
The Decimal key provides accurate entry of
setpoint values.
A +/- key has also been provided to allow entry
of negative values and AM/PM selection during
time entry.
In order to accept changes made to the chiller
setpoints, the Check key is provided as a universal ‘Enter’ key or ‘Accept’’ symbol.
In order to reject entry of a setpoint or dismiss
an entry form, the ‘X’ key is provided as a universal ‘Cancel’ symbol.
Cursor Arrow keys are provided to allow movement on
screens which contain a large
amount of entry data. In addition, these keys can be used
to scroll through history and
event logs.
The Start/Stop control is operated via a three-position
rocker switch. When toggled all the way to the right, it is
considered in the STOP/RESET position. When in the
12

00134VIP

middle position, this is considered the RUN state. When
toggled to the left-most position, it is considered in the
START state. Each state is described in detail below:
• STOP / RESET (O)

When in this position, the chiller will not run under
any condition. For safety reasons, this position is
required for many maintenance tasks to be completed
(such as proximity probe and vane calibration). In
addition, the switch must be placed in this state
following a Safety shutdown before the chiller is
allowed to restart. This guarantees that manual intervention has taken place and the shutdown has been
acknowledged.
• START (◄)

The switch can only remain in this position when
being acted upon by a manual force. Once the user
has released the switch, it automatically reverts to
the RUN position. Generally, this state only occurs
momentarily as the operator attempts to locally start
the unit. Once this position has been sensed, if all
fault conditions are cleared, the unit will enter the
system prelube (start sequence).
• RUN (

)

When in this position, the chiller is able to operate.
The switch spring-returns to this state after it has
been toggled to the START position. When in this
state, the chiller is allowed to function normally and
will also allow the chiller to automatically restart following a Cycling shutdown. The switch must be in
this state to receive a valid remote start signal when
operating under a remote control source.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

INTERFACE CONVENTIONS
OVERVIEW

The new graphical display on each control panel allows
a wide variety of information to be presented to the
user. Each screen description in this document will begin
with a section entitled Overview which will describe
the graphical elements on the screen and give a short
summary of the functions available. Each element on
the screen will then be categorized into three distinct
groups: Display Only, Programmable and Navigation.
Below is a short description of what types of information
are included in these groups.
The Programmable values and Navigation commands
are also subject to access level restrictions as described
below. For each of these elements, an indication is given
to show the minimum access level required to program
the value or navigate to the subscreen.
DISPLAY ONLY

Values in this group are read-only parameters of information about the chiller operation. This type of information may be represented by a numerical value, a text
string or an LED image. For numerical values, if the
monitored parameter is above the normal operating
range, the high limit value will be displayed along with
the ‘>’ symbol; if it is below the normal operating range,
the low limit value will be displayed along with the
‘<’ symbol. In some cases, the value may be rendered
invalid by other conditions and the display will use X’s
to indicate this.
PROGRAMMABLE

Values in this group are available for change by the user.
In order to program any setpoints on the system, the user
must Þrst be logged in with the appropriate access level.
Each of the programmable values requires a speciÞc Access Level which will be indicated beside the speciÞed
value. All of the programmable controls in the system
fall into one of the categories described below:
Access Level
In order to program any setpoints on the system, the user
must Þrst login with an appropriate access level. When
power is applied to the chiller, the system begins with an
Access Level of VIEW. This will allow the user to navi-

YORK INTERNATIONAL

gate to most screens and observe the values displayed
there. However, the user will not be allowed to change
any values. To change any values, the user must return to
the Home Screen (shown by default when power is applied to the system) and use the LOGIN button or utilize
the CHANGE SETPOINTS key described below. At
this point, the user will be prompted to enter a User ID
and the corresponding Password. By default, the User
ID is zero (0). In order to gain standard OPERATOR
level access, the Password would be entered as 9 6 7 5,
using the numeric keypad. OPERATOR access reverts
to the VIEW level after 10 continuous minutes without
a keypress. If a custom User ID and Password have been
deÞned (see User Screen), the user may enter that User
ID and the corresponding Password value.
If the correct password is received, the user is authorized with the appropriate Access Level. If an incorrect
password is entered, the user is notiÞed of the failure
and prompted again. At this point the user may retry the
password entry or cancel the login attempt.
Change Setpoints
On screens containing setpoints programmable at the
OPERATOR access level, a key with this label will be
visible if the present access level is VIEW. This key
brings up the Access Level prompt described above. It
allows the user to login at a higher Access Level without
returning to the Home Screen. After login, the user may
then modify setpoints on that screen.
Setpoints
The control center uses the setpoint values to control the
chiller and other devices connected to the chiller system.
Setpoints can fall into several categories. They could be
numeric values (such as 45.0°F for the Leaving Chilled
Liquid Temperature) or they could Enable or Disable a
feature or function.
Regardless of which setpoint is being programmed, the
following procedure applies:
1. Press the desired setpoint key. A dialog box appears
displaying the present value, the upper and lower
limits of the programmable range and the default
value.
2. If the dialog box begins with the word “ENTER”,
use the numeric keys to enter the desired value.

OptiView Control Center
FORM 160.55-O1 (604)

Leading zeroes are not necessary. If a decimal point
is necessary, press the ‘•’ key (i.e. 45.0).
Pressing the ▲ key, sets the entry value to the default
for that setpoint. Pressing the ▼ key, clears the present entry. The ◄ key is a backspace key and causes
the entry point to move back one space.
If the dialog box begins with “SELECT”, use the
◄ and ► keys to select the desired value.
If the previously deÞned setpoint is desired, press
the ‘X’ (Cancel) key to dismiss the dialog box.
3. Press the ‘!’ (Enter) key.
If the value is within range, it is accepted and the
dialog box disappears. The chiller will begin to operate based on the new programmed value. If out of
range, the value will not be accepted and the user is
prompted to try again.
Manual Controls
Some keys are used to perform manual control functions. These may involve manual control of items such
as the pre-rotation vanes, variable oriÞce (future) or
hot gas bypass valve. Other keys in this category are
used to initiate/terminate processes such as calibrations
or reports.
Free Cursor
On screens containing many setpoints, a speciÞc “soft”
key may not be assigned to each setpoint value. A soft
key will be assigned to enable the cursor arrow keys
below the numeric keypad which are used to “highlight”
the desired setpoint Þeld. At this point, the ‘!’ key is
pressed to bring up a dialog prompting the user to enter
a new setpoint value. The ‘X’ key cancels cursor mode.
(See the Schedule Screen [Fig. 24] for an example.)

Home Screen (page 14)
System Screen (page 16)
Evaporator (page 18)
Condenser (page 20)
Purge (page 22)
Refrig. Level Control (page 24)
Compressor (page 26)
Hot Gas Bypass (page 28)
Surge Protection Screen (page 30)
Vane Calibration (page 32)
VSD Tuning (page 34)
Oil Sump (page 36)
Motor (page 37)
EM Starter Version (page 37)
Mod “A” Solid State Starter (page 38)
Mod “B” Solid State Starter (page 40)
VSD Version (page 42)
VSD Details (page 44)
ACC Details (page 48)
Harmonic Filter Details (page 50)
Setpoints (page 54)
Setup (page 56)
Schedule (page 58)
User (page 60)
Comms (page 62)

NAVIGATION

Printer (page 64)

In order to maximize the amount of values which the
panel can display to the user and in order to place those
values in context, multiple screens have been designed to
describe the chiller operation. In order to move from one
screen to the next, navigation keys have been deÞned.
These keys allow the user to either move “forward” to
a subscreen of the present screen or move “backward”
to the previous screen. Except for the Home Screen
display, the upper-right “soft” key will always return
the user to the Home Screen. Navigating with “soft”
keys is as simple as pressing the key next to the label
containing the name of the desired screen. The system
will immediately refresh the display with the graphics
for that screen. Following is a layout of all the screens
and how they are connected.

Sales Order (page 66)

Operations (page 68)
Diagnostics (Refer to YORK
Service Manual 160.55-M1)
History (page 70)
History Details (page 72)
Security Log (page 73)
Security Log Details (page 74)
Trend (page 76)
Trend Setup (page 78)
Advanced Trend Setup (page 80)
Common Slots (page 82)
Custom View (page 83)
Custom Setup (page 84)
YORK INTERNATIONAL

FORM 160.55-O1 (604)

LANGUAGES

The Screens can be displayed in various languages. Language selection is done on the USER Screen. The desired
language is selected from those available. Not all languages

are available. English is the default language. If a language
other than English is being displayed, an English-only speaking person should navigate to the USER Screen using the
preceding Navigation chart and select English per the USER
Screen instructions in this book.

ANALOG INPUT RANGES
The following table indicates the valid display range for each of the analog input values. In the event that the input
sensor is reading a value outside of these ranges, the < or > symbols will be displayed beside the minimum or maximum value, respectively.

ANALOG INPUT
Leaving Chilled Liquid Temperature
Return Chilled Liquid Temperature
Leaving Condenser Liquid Temperature
Return Condenser Liquid Temperature
Evaporator Refrigerant Temperature
Discharge Temperature
Oil Temperature
Condenser Pressure
Condenser Temperature (R11)*
Condenser Temperature (R123)*
Evaporator Pressure
Evaporator Temperature (R11)*
Evaporator Temperature (R123)*
Oil Sump Pressure
Oil Pump Pressure
Purge Pressure
Refrigerant Level (Future)
Drop Leg Refrigerant Temperature

ENGLISH RANGE
LOW
HIGH
UNITS
0.0
82.0
°F
0.0
94.1
°F
8.0
133.5
°F
8.0
133.5
°F
0.0
126.1
°F
19.0
226.3
°F
19.0
226.3
°F
2.5
35.3
PSIA
-1.4
124.2
°F
7.2
130.1
°F
0.0
12.5
PSIA
-31.2
66.8
°F
-22.4
74.2
°F
2.9
20.9
PSIA
14.3
78.2
PSIA
0.0
100.0
PSIA
0.0
100.0
%
0.0
121.8
°F

LOW
-17.7
-17.7
-13.3
-13.3
-17.7
-7.2
-7.2
17.2
-18.5
-13.7
6.9
-35.7
-30.2
20.0
98.6
6.9
0.0
-17.7

METRIC RANGE
HIGH
UNITS
27.7
°C
34.5
°C
56.3
°C
56.3
°C
52.3
°C
107.9
°C
107.9
°C
243.4
KPAA
51.2
°C
54.5
°C
86.2
KPAA
19.3
°C
23.4
°C
144.1
KPAA
539.2
KPAA
689.5
KPAA
100.0
%
49.8
°C

*Saturation temperatures are calculated values. They will display XXX if the pressure used for the calculation is out of range.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

HOME SCREEN

FIG. 4

OVERVIEW
When the chiller system is powered on, the above default display appears. The primary values which must
be monitored and controlled are shown on this screen.
The Home Screen display depicts a visual representation
of the chiller itself. Animation indicates chilled liquid
ßow.
DISPLAY ONLY
Chilled Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
evaporator.
Chilled Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
evaporator.
Condenser Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
condenser.
Condenser Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
condenser.
Motor Run (LED)
Is ON when the digital output controlling the Motor
Starter contact is on.
16

00347VIP

Input Power (kW)
Available only if the chiller system is utilizing a Variable Speed Drive motor controller or Mod “B” Solid
State Starter. This displays the total input power used
by the system.
% Full Load Amps
This displays the percentage of full load amps utilized
by the system.
Operating Hours
Displays the cumulative operating hours of the chiller.
PROGRAMMABLE
Login
Access Level Required: VIEW
The Control Center restricts certain operations based
on password entry by the operator. Three different access levels are provided as follows: VIEW: The panel
defaults to the lowest access level which is termed
VIEW. In this mode, the chiller operating values and
setpoints can be observed, but no changes can be made.
OPERATOR: The second access level is termed OPERATOR and will allow the customer to change all
of the setpoints required to operate the chiller system.
The OPERATOR access level reverts to the VIEW
level after 10 continuous minutes without a keypress.
SERVICE: In the event that advanced diagnostics are
necessary, a SERVICE access level has been provided.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Only qualiÞed service personnel utilize this access level.
This level provides advanced control over many of the
chiller functions and allows calibration of many of the
chiller controls. The access levels are listed above in
hierarchical order beginning with the lowest level and
proceeding to the highest level. Users logged in under
higher access levels may perform any actions permitted
by lower access levels.

NAVIGATION

The OPERATOR access level is accompanied by a
10-minute timeout. After ten (10) successive minutes
without a keypress, the panel will revert to the VIEW
access level. This prevents unauthorized changes to the
chiller if a user was logged in at a higher access level
and failed to logout. Proper procedure requires that after
making necessary setpoint adjustments the user return
to the Home Screen and logout.

Condenser
A detailed view of all condenser parameters, including
control of the purge functions.

Logout
Access Level Required: OPERATOR
This key is displayed when a user is logged in at any
level other than VIEW. Pressing it will return the access
level to VIEW.

Oil Sump
A detailed view of all the oil pump and oil sump parameters.

Print
Access Level Required: VIEW
Use this key to generate a hard-copy report of the present
system status. This provides a snapshot of the primary
operating conditions at the time the key is pressed. The
History page provides enhanced reporting capability.
(See HISTORY below.) This option will not be present
if the chiller is presently conÞgured to log any incoming
Adaptive Capacity Control map points. (See the Adaptive Capacity Control Details screen.)
Message Clear
Access Level Required: SERVICE
When certain safety or cycling conditions have been
detected and the chiller has been shutdown, the main
status display of the chiller will continue to display a
message indicating the cause of the shutdown. Using
this key, the message can be cleared once the condition
has been removed.

System
Used to provide additional system information.
Evaporator
A detailed view of all evaporator parameters, including
the programmable Leaving Chilled Liquid Setpoints.

Compressor
A detailed view of all the compressor parameters. This
includes pre-rotation vane control, Hot Gas Bypass
Control and PRV calibration.

Motor
A detailed view of the motor controller parameters, speciÞc to the controller type presently utilized on the chiller
system. This allows programming of the Current Limit
and the Pulldown Demand Limit values. For a VSD
system, the Adaptive Capacity Control and Harmonic
Filter information is controlled under this screen.
Setpoints
This screen provides a single location to program the
most common system setpoints. It is also the gateway
to many of the general system setup parameters such as
Date/Time, Display Units, Scheduling, Printer Setup,
etc.
History
This screen provides access to a snapshot of system data
at each of the last 10 shutdown conditions.

Warning Reset
Access Level Required: OPERATOR
Use of this key acknowledges a warning condition and
resets the message display associated with it.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

SYSTEM SCREEN

FIG. 5

OVERVIEW
This screen gives a general overview of common chiller
parameters for both shells.
DISPLAY ONLY
Discharge Temperature
Displays the temperature of the refrigerant in its gaseous state at discharge of the compressor as it travels
to the condenser.
Chilled Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
evaporator.
Chilled Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
evaporator.
Chilled Liquid Temperature - Setpoint
Displays the active temperature setpoint to which the
chiller is controlling the evaporator liquid. This value
could come from a 0-20mA or 4-20mA, 0-10VDC or 210VDC input in Analog Remote mode, PWM signal in
Digital Remote mode, MicroGateway interface in ISN
mode or a locally programmed value in local mode.
Evaporator Pressure
Displays the present refrigerant pressure in the evaporator.
18

00348VIP

Evaporator Saturation Temperature
Displays the present saturation temperature in the
evaporator.
Condenser Liquid Temperature - Leaving
Displays the temperature of the liquid as it leaves the
condenser.
Condenser Liquid Temperature - Return
Displays the temperature of the liquid as it enters the
condenser.
Condenser Pressure
Displays the refrigerant pressure in the condenser.
Condenser Saturation Temperature
Displays the saturation temperature in the condenser.
Oil Sump Temperature
Displays the temperature of the oil in the sump.
Oil Pressure
Displays the pressure differential between the pump oil
pressure transducer and the sump oil pressure transducer.
If either of the transducers used to calculate this differential is out of range, the display Þeld will show XX.X.
% Full Load Amps
This displays the percentage of full load amps utilized
by the system.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Current Limit
Displays the current limit value in use. This value could
come from a 0-20mA or 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode or
a locally programmed value.

NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

PROGRAMMABLE
None

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

EVAPORATOR SCREEN

FIG. 6

OVERVIEW
This screen displays a cutaway view of the chiller evaporator. All setpoints relating to the evaporator side of
the chiller are maintained on this screen. Animation of
the evaporation process indicates whether the chiller is
presently in a RUN condition. Animation of the liquid
ßow indicates chilled liquid ßow.
DISPLAY ONLY
Chilled Liquid Flow Switch (Open / Closed)
Displays whether the liquid ßow is present in the
evaporator.
Chilled Liquid Pump
Displays the command presently sent by the control
center to the Chilled Liquid Pump (RUN or STOP).
Evaporator Pressure
Displays the present refrigerant pressure in the evaporator.
Evaporator Saturation Temperature
Displays the present saturation temperature in the evaporator.
Return Chilled Liquid Temperature
Displays the temperature of the liquid as it enters the
evaporator.
Leaving Chilled Liquid Temperature
Displays the temperature of the liquid as it leaves the
evaporator.
20

00349VIP

Evaporator Refrigerant Temperature
Displays the temperature of the refrigerant in the evaporator, if the sensor is present.
Small Temperature Difference
Displays the difference between the Leaving Chilled
Liquid temperature and the Evaporator Refrigerant temperature. The Evaporator Refrigerant temperature will be
represented by the Refrigerant Temperature sensor input
if the sensor is present, otherwise it will be represented
by the Evaporator Saturation temperature.
Leaving Chilled Liquid Temperature Setpoints –
Setpoint
Displays the present setpoint to which the chiller is operating, whether controlled locally or remotely.
Leaving Chilled Liquid Temperature Setpoints
– Shutdown
Displays the Leaving Chilled Liquid Temperature at which
the chiller will shut down to avoid over-cooling the building. By default this value is 4°F below the Leaving Chilled
Setpoint.
Leaving Chilled Liquid Temperature Setpoints
– Restart
Displays the Leaving Chilled Liquid Temperature at
which the chiller will restart after it has shut down due
to over-cooling temperature. By default, the chiller
will restart at the Leaving Chilled Liquid Temperature
Setpoint.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

PROGRAMMABLE
Local Leaving Chilled Liquid Tem per a ture Range Access Level Required: OPERATOR
This is the range over which an analog (0-20mA or 420mA, 0-10VDC or 2-10VDC) in Analog Remote Mode
or a digital signal (PWM) in Digital remote mode can reset
the Leaving Chilled Liquid Temperature setpoint above
the operator programmed Base Setpoint (see below).
Programmable as either 10°F or 20°F, with a default
of 20°F, it is added to the Base value to create a range
over which the remote device can reset the setpoint. For
example, if this setpoint is programmed for 10°F and
the operator programmed value is 45°F, then the remote
device can set the Leaving Chilled Liquid Temperature
setpoint over the range 45.0° - 55.0°F.
Local Leaving Chilled Liquid Temperature Setpoint
Access Level Required: OPERATOR
This value allows the user to deÞne the Leaving Chilled
Liquid Temperature that is to be maintained by the chiller.
It is programmable over the range of 38.0°F to 70.0°F
(water) or 10.0°F to 70.0°F (brine). If Smart Freeze (see
below) is enabled, the range is 36.0°F to 70.0°F (water).
A remote device can provide an analog signal (0-20mA
or 4-20mA, 0-10VDC or 2-10VDC) in Analog Remote
mode or PWM signal in Digital Remote mode that changes the setpoint by creating an offset above the operator
programmed Base Leaving Chilled Liquid Temperature
setpoint. This offset may be deÞned up to 10.0°F or
20.0°F above the Base setpoint (see the Remote Leaving
Chilled Liquid Temperature Setpoint Range description
above). Additionally, a MicroGateway (in ISN Remote
mode) can deÞne the setpoint through a serial data
stream. In this case, the incoming setpoint is not an
offset that is applied to the locally programmed Base
setpoint value, but rather is the setpoint value itself.
Leaving Chilled Liquid Temperature Cycling
Offset - Shutdown
Access Level Required: OPERATOR
This value allows the user to specify the Leaving Chilled
Liquid Temperature at which the chiller will shut down
on a LEAVING CHILLED LIQUID – LOW TEMPERATURE cycling shutdown. This is done by deÞning
an offset below the Leaving Chilled Liquid Temperature
setpoint. It is programmable over a range of 1°F to 64°F
below the setpoint, to a minimum cutout of 36°F (water),
34°F (water with Smart Freeze enabled) or 6°F (brine). It
establishes the minimum allowable temperature for the
Leaving Chilled Liquid Temperature and prevents overcooling of the building. Anytime the Leaving Chilled
Liquid Temperature setpoint is increased, the shutdown
YORK INTERNATIONAL

threshold is 36.0°F (water) or 6.0°F (brine) for the next
ten (10) minutes. If Smart Freeze (see below) is enabled,
the threshold is 34.0°F for the next 10 minutes. After
ten (10) minutes have elapsed, the shutdown threshold
becomes the programmed setpoint value.
Leaving Chilled Liquid Temperature Cycling
Offset - Restart
Access Level Required: OPERATOR
This value allows the user to specify the Leaving Chilled
Liquid Temperature at which the chiller will restart
after a shutdown on a LEAVING CHILLED LIQUID
– LOW TEMPERATURE cycling shutdown. This is
done by deÞning an offset above the Leaving Chilled
Liquid Temperature setpoint. It is programmable over a
range of 0°F to 70°F above the setpoint, to a maximum
restart value of 80°F. The chiller will automatically restart when this temperature is reached. This setpoint can
be used to reduce chiller cycling by delaying the chiller
restart until the cooling load has increased.
Brine Low Evaporator Cutout
Access Level Required: SERVICE
This value is only available in Brine mode. It allows
the user to specify the Evaporator Pressure at which a
safety shutdown is initiated. Service Technicians refer
to YORK Service Manual 160.55-M1.
Sensitivity
Access Level Required: SERVICE
This value allows the user to adjust the sensitivity of the
Leaving Chilled Liquid Temperature control. Service
Technicians refer to YORK Service Manual 160.55M1.
Smart Freeze (Off / On)
Access Level Required: SERVICE
This value is only available if the chiller is not in Brine
mode. It allows the user to enable the Smart Freeze Point
Operation which allows the chiller to run closer to the
freeze point without shutting down. Service Technicians
refer to YORK Service Manual 160.55-M1.
Refrigerant (Enabled / Disabled)
Access Level Required: SERVICE
When an Evaporator Refrigerant Sensor has been installed
it must be enabled via this toggle before the system will
utilize the new, enhanced resolution input. Service Technicians refer to YORK Service Manual 160.55-M1.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
21

OptiView Control Center
FORM 160.55-O1 (604)

CONDENSER SCREEN

FIG. 7

00350VIP0

OVERVIEW
This screen displays a cutaway view of the chiller
condenser. All setpoints relating to the condenser side
of the chiller are maintained on this screen. Animation
indicates condenser liquid ßow. This screen also serves
as a gateway to controlling the Refrigerant Level.
DISPLAY ONLY
Leaving Condenser Liquid Temperature
Displays the water temperature as it leaves the condenser.
Return Condenser Liquid Temperature
Displays the water temperature as it enters the condenser.
Condenser Pressure
Displays the refrigerant pressure in the condenser.
Condenser Saturation Temperature
Displays the saturation temperature in the condenser.
Small Temperature Difference
Displays the difference between the Condenser Refrigerant temperature and the Leaving Condenser Liquid
temperature. The Condenser Refrigerant temperature
will be represented by the Condenser Saturation temperature.
22

Drop Leg Refrigerant Temperature
Displays the temperature of the refrigerant in the drop
leg between the condenser and evaporator shells, if the
sensor is present.
Sub-Cooling Temperature
Displays the difference between the Condenser Refrigerant temperature and the Drop Leg Refrigerant temperature. The Condenser Refrigerant temperature will
be represented by the Condenser Saturation temperature.
If the Drop Leg sensor is not present, this temperature
is not displayed.
High Pressure Switch (Open / Closed)
Displays the present position of the high pressure switch.
This will indicate whether a High Pressure fault is present.
Condenser Liquid Flow Switch
Indicates whether ßow is present in the condenser.
Condenser Liquid Pump (Run / Stop)
Indicates whether Condenser liquid pump is operating.
Refrigerant Level Position
Displays the present position of the refrigerant level if
this function is enabled.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Refrigerant Level Setpoint
Displays the setpoint to which the refrigerant level is
being controlled.

it must be enabled via this toggle before the system will
utilize the new, enhanced resolution input. Service Technicians refer to YORK Service Manual 160.55-M1.

Ramp Up Time Remaining
Displays the time remaining in the period in which
the Refrigerant Level Setpoint is being ramped to the
Refrigerant Level Target Setpoint. This only displayed
if the Refrigerant Ramp is in effect and the value is
non-zero. Service Technicians refer to YORK Service
Manual 160.55-M1.

NAVIGATION

PROGRAMMABLE
High Pressure Warning Threshold
Access Level Required: SERVICE
This value allows the user to deÞne the condenser pressure at which the chiller will initiate a warning.

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Purge
Access Level Required: VIEW
Moves to the subscreen allowing programming of the
Purge System Setpoints.
Refrigerant Level Control
Access Level Required: SERVICE
Moves to the sub-screen allowing programming of the
Refrigerant Level control setpoints.

Drop Leg (Enabled / Disabled)
Access Level Required: SERVICE
When a Drop Leg Refrigerant Sensor has been installed

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

PURGE SCREEN

FIG. 8

OVERVIEW
This screen displays a cutaway view of the Purge Tank.
LED’s depict the state of the Float switches, Oil Valve
solenoid and Air Valve solenoid and the purge exhaust
count is displayed. All setpoints relating to the purge
system are maintained on this screen. The Purge tank
oil level, based on the position of the ßoat switches,
is depicted through animation. When both the Float
Switches are closed, the oil level is shown at its lowest
(empty) level. When both Float switches are open, the
level is shown at its highest (full) level. Levels between
these extremes are shown at midpoint.

00351VIP

Extinguished when it is open, indicating the level is at
maximum (full).
Bottom Float Switch (LED)
Illuminated when the Bottom Float Switch is closed, indicating the Purge Tank oil level is at minimum (empty).
Extinguished when it is open, indicating the oil level is
above minimum.
Oil Valve Solenoid (LED)
Illuminated when the Oil Valve Solenoid is energized,
Þlling the Purge Tank with oil. Extinguished when it is
de-energized, draining the oil from the Purge tank.

DISPLAY ONLY

Pressure
Displays the pressure in the Purge Tank.

Air Valve Solenoid (LED)
Illuminated when the Air Valve Solenoid is energized
(open), venting non-condensibles from the Purge tank.
Otherwise, extinguished. For High EfÞciency (pump
assisted) purge systems, the valve is energized at >90.0
PSIA and de-energizes when the pressure decreases to
<80.0 PSIA. For non-assisted purge systems, the valve
is energized at >34.7 PSIA and de-energized when the
pressure decreases to <29.7 PSIA.

Exhaust Count
Displays the number of purge exhausts that have occurred within the last 0 to 60 minutes, as displayed in
the Exhaust Window. After a 60 minute bypass at chiller
start, purge exhausts are counted until the Excess Purge
threshold is reached or the chiller shuts down, whereupon the count is frozen. The count will be reset when
the chiller starts.

Top Float Switch (LED)
Illuminated when the Top Float Switch is closed,
indicating the Purge Tank oil level is less than full.

Exhaust Window
Displayed as 0 to 60 minutes. After a 60 minute bypass
at chiller start, the Exhaust Window increments from 0

YORK INTERNATIONAL

FORM 160.55-O1 (604)

to 60. During this period, purge exhausts are counted
and the Exhaust Count displayed is that which has occurred in the last number of minutes displayed in the
Exhaust Window. After the Exhaust Window reaches
60, the purge exhausts that occurred in the oldest minute are discarded from the Exhaust Count and exhausts
from the most recent minute are shifted in, providing a
rolling count of purge exhausts that occurred in the last
60 minutes. It remains at 60 until the chiller is restarted,
whereupon it is reset to 0.
Bypass Time Left
Replaces “Exhaust Window” label during the Þrst 60
minutes of chiller run. Counts down the 60 minute purge
count bypass.

PSIA. Non pump-assisted purge systems exhaust at
>34.7 PSIA.
Maximum Purges/Hour
Access Level Required: OPERATOR/SERVICE
Allows the user to deÞne the number of purge air exhausts permitted before an Excess Purge Warning is displayed. With OPERATOR access level, the value can be
programmed over a range of 10 to 30 Purges/Hour. Service Technicians, in SERVICE access level can program
this setpoint over a greater range. Service Technicians
refer to YORK Service Manual 160.55-M1.
NAVIGATION

PROGRAMMABLE

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

High Efficiency Purge System (Enabled/Disabled)
Access Level Required: SERVICE
Selects the appropriate control and purge exhaust
thresholds for the installed purge system. High EfÞciency (pump assisted) purge systems exhaust at >90.0

Condenser
Access Level Required: VIEW
Causes an instant return to the Condenser Screen.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

REFRIGERANT LEVEL CONTROL SCREEN

FIG. 9

00303VIP

OVERVIEW
This screen displays a cutaway view of the chiller condenser, along with the liquid refrigerant level sensor and
the ßow control valve. All setpoints relating to the liquid
level control are maintained on this screen. Through
animation, the variable oriÞce position is displayed. In
addition, the refrigerant ßow control valve (variable
oriÞce) can be manually operated.

Refrigerant Level Control Mode
Indicates whether the liquid level control is under manual or automatic control.

Requires a login access level of
SERVICE. Service Technicians refer
to YORK Service Manual 160.55-M1
for operation instructions and explanation of all programmable setpoints
and displayed values.

Lower (LED)
Is ON when the digital output controlling the Level
Lower contact is on.

DISPLAY ONLY
Refrigerant Level Position
Displays the present position of the liquid level. The
refrigerant level is animated in the cutaway view of the
condenser. When the actual level is 0% to 15%, the level
is shown about 50% full. When the actual level is 16%
to 31%, the level is shown about 60% full. When the
actual level is 32% to 47%, the level is shown about 70%
full. When the actual level is 48% to 63%, the level is
shown about 80% full. When the actual level is 64% to
79%, the level is shown as about 90% full. Actual levels
above 79%, shown as 100% full.
26

Raise (LED)
Is ON when the digital output controlling the Level
Raise contact is on.

PROGRAMMABLE
[Refrigerant Level] Setpoint
Service Technicians refer to YORK Service Manual
160.55-M1.
[Refrigerant Level Control] Period
Service Technicians refer to YORK Service Manual
160.55-M1.
[Refrigerant Level Control] Proportional
Limit Open
Service Technicians refer to YORK Service Manual
160.55-M1.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

[Refrigerant Level Control] Proportional
Limit Close
Service Technicians refer to YORK Service Manual
160.55-M1.
[Refrigerant Level Control] Rate Limit Open
Service Technicians refer to YORK Service Manual
160.55-M1.
[Refrigerant Level Control] Rate Limit Close
Service Technicians refer to YORK Service Manual
160.55-M1.
[Refrigerant Level Control] Raise (Manual)
This key puts the level control into manual mode and
sends a RAISE command to the variable oriÞce.

[Refrigerant Level Control] Hold (Manual)
This key puts the level control into manual mode and
sends a HOLD command to the variable oriÞce.
[Refrigerant Level Control] Auto
Returns the Level Control to automatic mode.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

Condenser
Access Level Required: VIEW
Return to the Condenser Screen.

[Refrigerant Level Control] Lower (Manual)
This key puts the level control into manual mode and
sends a LOWER command to the variable oriÞce.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

COMPRESSOR SCREEN

FIG. 10

00483VIP

OVERVIEW
This screen displays a cutaway view of the chiller compressor, revealing the impeller and shows all conditions
associated with the compressor. In addition, with the
proper Access Level, the pre-rotation vanes may be
manually controlled. Animation of the compressor
impeller indicates whether the chiller is presently in a
RUN condition. This screen also serves as a gateway
to subscreens for calibrating the pre-rotation vanes, calibrating the proximity probe, conÞguring the Hot Gas
Bypass or providing advanced control of the compressor
motor Variable Speed Drive.
DISPLAY ONLY
Oil Pressure
Displays the pressure differential between the high side
oil pressure transducer (compressor bearing input) and
the low side oil pressure transducer (oil sump). If either
of the transducers used to calculate this differential is
out of range, the display Þeld will show XX.X.
Oil Sump Temperature
Displays the temperature of the oil in the sump
Discharge Temperature
Displays the temperature of the refrigerant in its gaseous
state at discharge of the compressor as it travels to the
condenser.
28

Superheat Temperature
Displays the discharge superheat temperature, calculated as (Discharge temperature – Condenser Saturated
temperature).
Vane Motor Switch (LED)
Illuminates when the vanes are completely closed.
Vent Line Solenoid (LED)
Illuminates when the solenoid is energized.
Pre-Rotation Vanes Control Mode
Access Level Required: SERVICE
Indicates whether the vanes are under manual or automatic control.
[Pre-Rotation Vanes] Open (LED)
Access Level Required: SERVICE
Indicates whether the vanes are in the process of opening.
[Pre-Rotation Vanes] Close (LED)
Access Level Required: SERVICE
Indicates whether the vanes are in the process of closing.
Pre-Rotation Vanes Position
(Variable Speed Drive only)
Access Level Required: SERVICE
This value displays the present position of the pre-rotation vanes as a percentage between 0 and 100%.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Full Load Amps
Access Level Required: SERVICE
Displays the motor current as a percentage of the Full
Load Amps (FLA) value.
Phase A, B, C Current (Solid State Starter only)
Access Level Required: SERVICE
Displays the 3-phase motor current values being read
from the Solid State Starter.
PROGRAMMABLE
[Pre-Rotation Vanes] Open (Manual)
Access Level Required: SERVICE
This key puts the vane control into manual mode and
sends an OPEN command to the vanes.
[Pre-Rotation Vanes] Close (Manual)
Access Level Required: SERVICE
This key puts the vane control into manual mode and
sends a CLOSE command to the vanes.
[Pre-Rotation Vanes] Hold (Manual)
Access Level Required: SERVICE
This key puts the vane control into manual mode and
sends a HOLD command to the vanes.
[Pre-Rotation Vanes] Auto
Access Level Required: SERVICE
This key returns the vane control to automatic mode.

Pre-Rotation Vane Calibration
Access Level Required: SERVICE
Only available if the chiller is stopped and the system
uses a Variable Speed Drive or Hot Gas Bypass control. Moves to the subscreen allowing calibration of the
Pre-rotation vanes. Service Technicians refer to YORK
Service Manual 160.55-M1.
VSD TUNING (Variable Speed Drive only)
Access Level Required: SERVICE
Moves to the subscreen allowing advanced tuning of
the Variable Speed Drive. Service Technicians refer to
YORK Service Manual 160.55-M1.
Hot Gas
Access Level Required: SERVICE
Moves to the subscreen that allows programming of the
Hot Gas Bypass control setpoints and manual control
of the Hot Gas Bypass valve. Only displayed if Hot gas
Bypass feature has been enabled on the OPERATIONS
Screen. Service technicians refer to YORK Service
Manual 160.55-M1.
Surge
(Flash memory Card version C.MLM.02.02.xxx and
later)
Access Level Required: VIEW
Moves to the sub-screen that allows viewing and
programming of the Surge Protection feature. Service
Technicians refer to Service Manual 160.55-M1.

NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

HOT GAS BYPASS SCREEN

FIG. 11

OVERVIEW
This screen displays a cutaway view of the Hot Gas Bypass
Valve. All setpoints relating to Hot Gas Bypass control are
maintained on this screen. Also, related Hot Gas Bypass
control parameters are displayed for reference. Through
animation, the relative valve position is displayed. In addition, the valve can be manually operated.

Requires access level of SERVICE.
Service Technicians refer to YORK
Service Manual 160.55-M1 for operation instructions and explanation
of all programmable setpoints and
displayed values.
DISPLAY ONLY
Valve Position
Displays the position of the Hot Gas valve over the
range of 0% (closed) to 100% (fully open). The valve
position is animated. When the actual position is 0% to
19%, the valve is shown fully closed. When actual position is 20% to 39% the valve is shown 25% open. When
actual position is 40% to 59%, the valve is shown 50%
open. When actual position is 60% to 79%, the valve is
shown as 75% open. Positions greater than 79% shown
as full open.
30

00476VIP

Pre-rotation Vanes Position
Displays the position of the Pre-Rotation Vanes over the
range of 0% (closed) to 100% (fully open). Displayed
at XXX until calibration procedure is performed by
service technician.
Delta P/P
A parameter that represents system differential or
“Head”. It is calculated as [(condenser pressure – evaporator pressure) / evaporator pressure].
Temperature Differential
The difference between the Leaving Chilled Liquid Temperature and the Leaving Chilled Liquid Temperature
Setpoint. It is calculated by subtracting the Leaving
Chilled Liquid temperature from the Leaving Chilled
Liquid Temperature Setpoint.
Total Surge Count
This is the total number of surge events that have been
detected over the lifetime of the chiller. These are the
surge events detected by the Surge Protection feature.
The surge events detected by the compressor Variable
Speed Drive Adaptive Capacity Control Board are not
included in this total.
Surge Detected (LED)
Illuminated for 5 seconds each time a surge is detected
by the Surge Protection feature. It does not illuminate

YORK INTERNATIONAL

FORM 160.55-O1 (604)

in response to surge events detected by the compressor Variable Speed Drive Adaptive Capacity Control
Board.
Hot Gas Bypass Control Mode
Indicates whether the Hot Gas Bypass is under automatic,
manual or override control. “Override” is displayed during Minimum Load override conditions or when the
Compressor Motor Variable Speed (if equipped) Drive
is running at less than maximum speed.
PROGRAMMABLE
Close Percentage
Service technicians refer to YORK Service Manual
160.55-M1.
Hold Period
Service technicians refer to YORK Service Manual
160.55-M1.
Surge Sensitivity
(Flash Memory Card version C.MLM.02.01.xxx and
earlier. On SURGE PROTECTION Screen in later
Flash Memory Card versions)
Service technicians refer to YORK Service Manual
160.55-M1.

Maximum Open
(Flash Memory Card version C.MLM.02.02.xxx
and later)
Service Technicians refer to YORK Service Manual
160.55-M1.
[Hot Gas Bypass Control] Open (Manual)
This key puts the Hot Gas Bypass Control in manual
mode and increases the valve position by 5%.
[Hot Gas Bypass Control] Close (Manual)
This key puts the Hot Gas Bypass Control in manual
mode and decreases the valve position by 5%.
[Hot Gas Bypass Control] Auto
Returns the Hot Gas Bypass Control to automatic
mode.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Compressor
Access Level Required: VIEW
Causes an instant return to the Compressor Screen.

Minimum Load
Service technicians refer to YORK Service Manual
160.55-M1.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

SURGE PROTECTION SCREEN

FIG. 12

OVERVIEW
(This feature applies to Flash Memory Card version
C.MLM.02.02.xxx and later)
This screen displays a cutaway view of the chiller
compressor and all parameters relating to the Surge
Protection feature. All setpoints relating to this feature
are maintained on this screen.
DISPLAY ONLY
Delta P/P
A parameter that represents the system differential or
“Head pressure”. It is calculated as (condenser pressure
– evaporator pressure) / evaporator pressure.
Surge Window Time
When the chiller enters run mode, this value counts
up to the time programmed as the COUNT WINDOW
setpoint. When it reaches the COUNT WINDOW minutes, the number of surge events in the oldest minute is
discarded and the number of surge events in the most
recent minute is added, thus providing a rolling count
of the total surge events that have occurred in the last
COUNT WINDOW minutes. This value is reset when
the chiller shuts down.
Surge Window Count
Displays the number of surge events that have oc-

00482VIP

curred in the last 1 to 5 minutes as programmed with
the COUNT WINDOW setpoint. If the chiller has been
running for less than the COUNT WINDOW minutes, it
is the number of surge events that have occurred within
the last number of minutes displayed as the SURGE
WINDOW TIME. The count is cleared when the chiller
shuts down.
Surge Detected (LED)
Illuminates for 5 seconds each time a surge is detected
by the Surge Protection feature. It does not illuminate
in response to surge events detected by the compressor Variable Speed Drive Adaptive Capacity Control
Board.
Total Surge Count
Displays the total number of surge events detected over
the lifetime of the unit (up to a maximum of 65535).
These are the surge events detected by the Surge Protection feature. The surge events detected by the compressor
Variable Speed Drive Adaptive Capacity Control Board
are not included in this total.
Extended Run Time Remaining
Displays the time remaining in the 10-minute “EXTENDED RUN” period. During this period, the Prerotation vanes are driven closed and “Warning – Surge
Protection – Excess Surge Limit” is displayed. Refer to
operation under “Count Limit” below.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

PROGRAMMABLE
Shutdown (Enabled/Disabled)
Access Level Required: OPERATOR
Allows the user to select whether the chiller will shutdown or continue to run when an Excess Surge situation
has been detected.
If this setpoint is Enabled and the EXTENDED RUN
setpoint is Disabled, a safety shutdown is performed
when the SURGE WINDOW COUNT exceeds the
COUNT LIMIT setpoint.
If this setpoint is Enabled and the EXTENDED RUN
setpoint is Enabled, a safety shutdown is performed if
the SURGE WINDOW COUNT exceeds the COUNT
LIMIT setpoint at the completion of the 10 minute Extended Run period.
“Surge Protection – Excess Surge” is displayed with
either shutdown.
If this setpoint is Disabled, refer to operation under
“Count Limit” below.
With Software version C.MLM.02.05.xxx (and later) or
C.OPT.02.05.xxx (and later):
• If equipped with a compressor Variable Speed
Drive (VSD), the VSD output frequency must
be at maximum before the SHUTDOWN feature
is implemented or surge warning messages are
displayed.
• If equipped with a VSD and Hot Gas Bypass
(Enabled), the VSD output frequency must be
at maximum AND the Hot Gas Valve must be
at 100% before the SHUTDOWN feature is
implemented or surge warning messages are
displayed.
Extended Run (Enabled/Disabled)
Access Level Required: OPERATOR
Allows the user to select the surge correction/avoidance
EXTENDED RUN mode. This will be implemented
when an Excess surge situation is detected as follows:
Anytime the SURGE WINDOW COUNT exceeds the
COUNT LIMIT, the Pre-rotation vanes are driven closed
for the next 10 minutes. While this load inhibit is in effect, “Warning – Surge Protection – Excess Surge Limit”
is displayed. When 10 minutes have elapsed, the warning message and load inhibit are automatically cleared,
provided the SURGE WINDOW COUNT is less than
or equal to the COUNT LIMIT. If the SHUTDOWN

YORK INTERNATIONAL

setpoint is Enabled, and the SURGE WINDOW COUNT
exceeds the COUNT LIMIT at the completion of this
period, a safety shutdown is performed and “Surge
Protection – Excess Surge” is displayed.
If the Hot Gas Bypassed control is Enabled, the Hot Gas
Bypass Valve position must be 100% before the Extended
Run mode is implemented. If the chiller is equipped with a
compressor motor Variable Speed Drive, output frequency
must be at full speed (50 Hz/60 Hz) before the Extended
Run mode is implemented. If the chiller is equipped with
both Hot Gas Bypass and compressor motor Variable Speed
Drive, both of the conditions must be met before Extended
Run is implemented.
Count Window
Access Level Required: OPERATOR
Allows the user to deÞne the period of time (1 to 5
minutes; default 5 ; default 3 with Software version
C.MLM.02.05.xxx {and later} or C.OPT.02.05.xxx {and
later}) in which the number of surge events (SURGE
WINDOW COUNT) are compared to the maximum allowed (COUNT LIMIT), for the purpose of detecting
an excess surge situation.
Count Limit
Access Level Required: OPERATOR
Allows the user to deÞne the maximum number of surge
events (4 to 20; default 4; default 15 with Software version C.MLM.02.05.xxx {and later} or C.OPT.02.05.xxx
{and later}) that can occur within a deÞned period of time
before an Excess Surge situation is detected. If the SURGE
WINDOW COUNT exceeds the COUNT LIMIT, an Excess Surge situation has occurred.
When an Excess Surge situation is detected, the action
depends upon the following:
• If both the SHUTDOWN and EXTENDED RUN
setpoints are Disabled, the chiller will continue to
run, displaying the message “Warning – Excess
Surge detected”. See Hot Gas Bypass and Variable
Speed Drive exceptions above.
• If the SHUTDOWN setpoint is Enabled and the
EXTENDED RUN setpoint is Disabled, the chiller
will perform a safety shutdown and display “Surge
Protection – Excess Surge”. See Hot Gas Bypass
and Variable Speed Drive exceptions above.
• If the SHUTDOWN setpoint is Disabled and the
EXTENDED RUN setpoint is Enabled, the Pre-rotation Vanes are driven closed for 10 minutes and
“Warning – Surge Protection – Excess Surge Limit”
is displayed. When the 10 minutes have elapsed,

OptiView Control Center
FORM 160.55-O1 (604)

if the SURGE WINDOW COUNT is less than or
equal to the COUNT LIMIT, this message and load
inhibit are automatically cleared. Alternating with
this message is “Warning – Excess Surge Detected”
that continues after the 10 minute period has elapsed
until manually cleared with the Warning Reset key.
See Hot Gas Bypass and Variable Speed Drive exception above.
• If both the SHUTDOWN and EXTENDED RUN
setpoint are Enabled, the 10 minute Extended RUN
mode is invoked as described above. However, if the
SURGE WINDOW COUNT exceeds the COUNT
LIMIT at the completon of the 10 minute extended
run period, a safety shutdown is performed and
“Surge Protection – Excess Surge” is displayed. See
Hot Gas Bypass and Variable Speed Drive exception
above.

Surge Sensitivity
Access Level Required: SERVICE
Allows the user to deÞne the surge detection sensitivity.
Selectable over the range of 0.3 to 1.3; default 0.3. The
smaller the number, the greater the sensitivity.
Clear Surge Count
Access Level Required: ADMIN
Allows user to set the Total Surge Count to zero.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen
Compressor
Access Level Required: VIEW
Causes an instant return to the Compressor Screen.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

THIS PAGE INTENTIONALLY LEFT BLANK
TO MAINTAIN FORMAT

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

PRE-ROTATION VANES CALIBRATION SCREEN

FIG. 13

OVERVIEW
This screen displays a cutaway view of the chiller compressor, revealing the pre-rotation vanes and provides
the capability of calibrating the pre-rotation vanes for
either Variable Speed Drive or Hot Gas Bypass applications.

Requires a login access level of SERVICE. Service Technicians refer to
YORK Service Manual 160.55-M1
for operation instructions and explanation of all programmable setpoints
and displayed values.
DISPLAY ONLY
Pre-Rotation Vanes Opening (LED)
Indicates the vanes are opening.
Pre-Rotation Vanes Closing (LED)
Indicates the vanes are closing.
Calibration in Progress (LED)
Indicates the calibration sequence is in progress.

00354VIP

Hot Gas PRV Voltage
Displays the Pre-rotation Vanes position potentiometer feedback voltage when the Hot Gas Feature is
Enabled.
PROGRAMMABLE
Start Calibration
This option is hidden after calibration has started.
Service Technicians refer to YORK Service Manual
160.55-M1 for an explanation of this setpoint.
Cancel Calibration
This option only becomes available after calibration
has started. Service Technicians refer to YORK Service
Manual 160.55-M1 for an explanation of this setpoint.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Compressor
Access Level Required: VIEW
Return to the Compressor Screen.

Calibration Messages
These are text messages which step the user through the
calibration process and indicate its success or failure.
36

YORK INTERNATIONAL

FORM 160.55-O1 (604)

THIS PAGE INTENTIONALLY LEFT BLANK
TO MAINTAIN FORMAT

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

VSD TUNING SCREEN

FIG. 14

OVERVIEW
This screen displays a cutaway view of the chiller compressor, revealing the pre-rotation vanes and provides
the capability of manually controlling the pre-rotation
vanes. Animation of the pre-rotation vanes indicates
the pre-rotation vane position. In addition, this screen
allows manual control of the frequency command being
sent to the Variable Speed Drive.

Requires a login access level of
SERVICE. Service Technicians refer
to YORK Service Manual 160.55-M1
for operation instructions and explanation of all programmable setpoints
and displayed values.
DISPLAY ONLY
Output Frequency
Displays the Output Frequency reported by the Variable
Speed Drive.
Temperature Differential
Displays the differential between the Leaving Chilled
Liquid Temperature and Setpoint.

00477VIP

Delta P/P
Displays a value based on the pressure differential
be tween the Evaporator and Condenser pressures.
[(Condenser – Evaporator) / Evaporator]
Pre-Rotation Vanes Control Mode
Indicates whether the vanes are under manual or automatic control.
[Pre-Rotation Vanes] Open (LED)
Indicates whether the vanes are in the process of
opening.
[Pre-Rotation Vanes] Close (LED)
Indicates whether the vanes are in the process of
closing.
Pre-Rotation Vane Position
This value displays the present position of the pre-rotation vanes as a percentage between 0 and 100%.
[VSD] Command Frequency
Displays the frequency value being sent to the Adaptive
Capacity Control.
[VSD] Frequency Control Mode (Manual / Auto)
Displays the present state of the command frequency
control.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Output Current – Phase A, B, C
(Flash Memory Card version C.MLM.02.02.xxx
and later)
Displays the phase current measured to the motor.
PROGRAMMABLE
Set
Allows manual programming of the command frequency
value. Manually programming this value will put the
VSD frequency control into manual mode.
Auto
Following manual programming of the command frequency, this returns the system to automatic control.
Fixed
This key puts the VSD frequency control into Þxed speed
mode and constantly sends the maximum frequency to
the Variable Speed Drive control.
Incr Amount
DeÞnes the amount by which the Increase and Decrease
commands will modify the present VSD command frequency.
Increase
This key puts the VSD frequency control into manual
mode and increases the present command frequency by
the deÞned frequency increment. It will not raise the
value above the maximum allowed frequency.

YORK INTERNATIONAL

Decrease
This key puts the VSD frequency control into manual
mode and decreases the present command frequency by
the deÞned frequency increment. It will not lower the
value below one (1) Hz.
[Pre-Rotation Vanes] Open (Manual)
This key puts the vane control into manual mode and
sends an OPEN command to the contacts.
[Pre-Rotation Vanes] Close (Manual)
This key puts the vane control into manual mode and
sends a CLOSE command to the contacts.
[Pre-Rotation Vanes] Hold (Manual)
This key puts the vane control into manual mode and
sends a HOLD command to the contacts.
[Pre-Rotation Vanes] Auto
Returns Vane Control to automatic mode.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Compressor
Access Level Required: VIEW
Return to the Compressor Screen.

OptiView Control Center
FORM 160.55-O1 (604)

OIL SUMP SCREEN

FIG. 15

00356VIP

OVERVIEW
This screen displays a close-up of the chiller oil
sump.

Manual Oil Pump Operation Time Left
Displays the time remaining in the 10-minute manual
oil pump operation described below.

DISPLAY ONLY

PROGRAMMABLE

Oil Sump Temperature
Displays the temperature of the oil in the sump.

Manual Pump
Access Level Required: OPERATOR
This key puts the Oil Pump control in Manual Mode and
forces it to RUN. The Oil Pump is limited to running for
a maximum of ten (10) minutes. If a longer running time
is desired, this key must be pressed again. Manual Oil
Pump control is disabled (and the button hidden) during
system prelube, system run and system coastdown.

Oil Pressure
Displays the pressure differential between the high side
oil pressure transducer (output of oil Þlter) and the low
side oil pressure transducer (compressor housing). If
either of the transducers used to calculate this differential is out of range, the display Þeld will show XX.X.

NAVIGATION
Oil Pump Run Output (LED)
Indicates whether the Oil Pump is being commanded
to operate.

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

ELECTRO-MECHANICAL STARTER SCREEN

FIG. 16

00357VIP

OVERVIEW

PROGRAMMABLE

This screen displays all information pertaining to an
Electro-Mechanical Starter.

DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls
is commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value. For the Electro-Mechanical
Starter this is the data returned by the CM-2 board.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode
or a locally programmed value.
Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period if the value is non-zero.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

MOD “A” SOLID STATE STARTER SCREEN

FIG. 17

OVERVIEW
This screen displays all information pertaining to the
Mod “A” Solid State Starter.

0058VIP

Voltage - Phase A, B, C
Display the 3-phase input line voltage values being read
from the Solid State Starter.

DISPLAY ONLY

Current - Phase A, B, C
Display the 3-phase motor current values being read
from the Solid State Starter.

Motor Run (LED)
Indicates whether the digital output from the controls is
commanding the motor to RUN.

PROGRAMMABLE

Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value. For the Solid State Starter this
is the data returned by the Starter Logic board.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode or
a locally programmed value in local mode.
Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period.
Scale/Model
Display information about the Liquid Cooled-Solid
State Starter Rating and the maximum allowed Full
Load Amps.
42

Local Motor Current Limit
Access Level Required: OPERATOR
Allows the user to specify the maximum allowed motor current (as a percentage of FLA). When the motor
current reaches this value, the pre-rotation vanes will
not be permitted to open further. If the motor current
rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
Pulldown Demand Limit
Access Level Required: OPERATOR
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the speciÞed pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
following chiller start-up.
Pulldown Demand Time
Access Level Required: OPERATOR
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.
Full Load Amps
Access Level Required: SERVICE
DeÞne the maximum amps at which the motor can operate. This value is viewable when logged in under the
Operator or View access level. Service Technicians refer
to YORK Service Manual 160.55-M1.

threshold for initiating a shutdown. Service Technicians
refer to YORK Service Manual 160.55-M1.
Current Unbalance Check (Enabled / Disabled)
Access Level Required: SERVICE
Allows the user to control whether the logic checks for
current unbalance and initiates a shutdown as a result.
Service Technicians refer to YORK Service Manual
160.55-M1.

NAVIGATION
Supply Voltage Range
Access Level Required: SERVICE
Allows the user to select a speciÞc voltage range for voltage checking. When not disabled, this line voltage range
is used to determine a low line and high line voltage

YORK INTERNATIONAL

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

OptiView Control Center
FORM 160.55-O1 (604)

MOD “B” SOLID STATE STARTER SCREEN

FIG. 18

OVERVIEW
This screen displays all information pertaining to the
Mod “B” Solid State Starter.
DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls is
commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value.
Current Limit Setpoint
Displays the current limit in use. This value could come
from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC input
in Analog Remote Mode, PWM signal in Digital Remote
Mode, MicroGateway interface in ISN remote Mode or
a locally programmed value in Local Mode.
Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period.
Input Power
Displays the Kilowatts measured by the Solid State
Starter.
44

00359VIP

kW Hours
Displays the cumulative amount of kilowatts used over
time.
Starter Model
Displays the Solid State Starter model that is applied to
the chiller. Starter Models are 7L, 14L, 26L or 33L.
Voltage – Phase A, B, C
Displays the 3-phase input line voltage measured by the
Solid State Starter.
Current – Phase A, B, C
Displays the 3-phase motor current values measured by
the Solid State Starter.
Temperature – Phase A, B, C
Displays the temperatures of the Silicon Controlled
RectiÞer assemblies.
PROGRAMMABLE
Local Motor Current Limit
Access Level Required: OPERATOR
Allows the user to specify the maximum allowed motor
current (as percentage of FLA). When the motor current
reaches this value, the Pre-rotation Vanes will not be
permitted to open further. If the motor rises above this
value, the Pre-rotation Vanes will close to reduce the
current to this value.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Pulldown Demand Limit
Access Level Required: OPERATOR
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the speciÞed pulldown time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
following chiller start.
Pulldown Demand Time
Access Level Required: OPERATOR
Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.
Full Load Amps
Access Level Required: SERVICE
DeÞnes the maximum amps at which the motor can operate. This value is viewable when logged in at Operator
or View access level. Service technicians refer to YORK
Service Manual 160.55-M1.
Voltage Range
Access Level Required: SERVICE
Allows the user to select speciÞc line voltage range for
voltage checking. When not disabled, this line voltage
range is used to determine a low line and high line voltage threshold for initiating a shutdown. Service Technicians refer to YORK Service Manual 160.55-M1.
Starting Current
Access Level Required: SERVICE
DeÞnes the maximum allowed motor starting amps. The
Solid State Starter will limit the motor starting current

YORK INTERNATIONAL

to this value. Service technicians refer to YORK Service
manual 160.55-M1.
Open SCR (Enabled/Disabled)
Access Level Required: SERVICE
Allows the user to enable or disable the Solid State
Starter Open SCR safety detection. This must never
be disabled unless under advisement of the YORK
Factory. Service Technicians refer to YORK Service
Manual 160.55-M1.
Shorted SCR (Enabled/Disabled)
(Flash Memory Card version C.MLM.02.01 or later)
Access Level required: SERVICE
Allows the user to enable or disable the Solid State
Starter Shorted SCR safety detection. This must never
be disabled unless under advisement of the York Factory. Service Technicians refer to YORK Service Manual
160.55-M1.
kWH Reset
Access Level Required: SERVICE
Allows the user to reset the cumulative Kilowatt Hours.
Service technicians refer to YORK Service Manual
160.55-M1.
NAVIGATION
HOME
Access Level Required: VIEW
Causes an instant return to the HOME Screen.

OptiView Control Center
FORM 160.55-O1 (604)

VARIABLE SPEED DRIVE SCREEN

FIG. 19

OVERVIEW
This screen displays information pertaining to a Variable
Speed Drive (VSD).

00360VIP

Output Frequency
Displays the present output frequency to the motor.
Output Current - Phase A, B, C
Displays the phase current measured to the motor.

DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls is
commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode or
a locally programmed value.
Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period if the value is non-zero.
Output Voltage
Displays the output voltage measured to the motor.

Input Power
Displays the total Kilowatts measured by the VSD or
Harmonic Filter, if installed.
kW Hours
Displays the cumulative amount of kilowatts used over
time as the VSD motor controller operates.
Pre-Rotation Vane Position
Displays the pre-rotation vane position as a value between 0 and 100%.
Harmonic Filter Data (Harmonic Filter
installed only)
Supply kVA
Displays the supply kva measured by the Þlter.
Total Power Factor
Displays the relationship between the Input Power and
the Supply kVA.
Voltage Total Harmonic Distortion - L1, L2, L3
Displays the Total Harmonic Distortion (THD) for each
of the voltage lines as calculated by the Þlter.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Supply Current Total Demand Distortion L1, L2, L3
Displays the Total Dynamic Distortion (TDD) for each
of the supply current lines as calculated by the Þlter.
PROGRAMMABLE
Local Motor Current Limit
Access Level Required: OPERATOR
Allows the user to specify the maximum allowed motor current (as a percentage of FLA). When the motor
current reaches this value, the pre-rotation vanes will
not be permitted to open further. If the motor current
rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
Pulldown Demand Limit
Access Level Required: OPERATOR
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the speciÞed pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
following chiller start-up.
Pulldown Demand Time
Access Level Required: OPERATOR
Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.

YORK INTERNATIONAL

kWH Reset
Access Level Required: SERVICE
Allows the user to reset the cumulative Kilowatt Hours.
Service Technicians refer to YORK Service Manual
160.55-M1.
Filter Inhibit (Harmonic Filter installed only)
Access Level Required: SERVICE
Disable the Þlter logic from activating, although the
system will still communicate with the device. Only
available when chiller is stopped.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
VSD Details
Access Level Required: VIEW
Moves to the subscreen which provides more information about the Variable Speed Drive.
ACC Details
Access Level Required: SERVICE
Moves to the subscreen which provides more information about the Adaptive Capacity Control.
Filter Details (Harmonic Filter installed only)
Access Level Required: VIEW
Moves to the subscreen which provides more information about the Harmonic Filter.

OptiView Control Center
FORM 160.55-O1 (604)

VARIABLE SPEED DRIVE DETAILS SCREEN
(STYLE D VSD AND VSD WITH PART NUMBER 371-03789-XXX
(503 HP 60 HZ; 410 HP 50 HZ)

FIG. 20

OVERVIEW
This screen displays more detailed information pertaining to a Variable Speed Drive (VSD). Flash Memory
Card version C.MLM.02.04.xxx (and later) is required
for VSD part number 371-03789-xxx (503HP 60Hz;
419 HP 50Hz). Service Technicians refer to YORK
Service Manual 160.55-M1 for operation instructions
and explanation of all programmable setpoints and
displayed values.
DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls is
commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value. For the Variable Speed Drive
this is the data returned by the VSD Logic board.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital

LD09096

Remote mode, MicroGateway interface in ISN mode or
a locally programmed value.
Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period if the value is non-zero.
Water Pump Output (LED)
Indicates whether the relay controlling the water pump
output is energized.
Precharge Relay Output (LED)
Indicates whether the relay controlling the precharge
output is energized.
Trigger SCR Output (LED)
Indicates whether the relay controlling the trigger SCR
output is energized.
DC Bus Voltage
Displays the DC Bus voltage as reported by the VSD.
DC Inverter Link Current
Displays the DC Inverter link current as reported by
the VSD.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Internal Ambient Temperature
Displays the ambient temperature inside the VSD cabinet as reported by the VSD.
Converter Heatsink Temperature
Displays the heatsink temperature of the converter as
reported by the VSD.
Baseplate Temperature - Phase A, B, C
(“Labeled “Heatsink Temperatures on VSD Style D)
Displays the baseplate temperature of each of the 3phase voltage regulators as reported by the VSD
VSD Model
Access Level Required: SERVICE
Displays the Horsepower conÞguration of the Variable
Speed Drive control.
100% Full Load Amps
Displays the full load amps value as reported by the
VSD.
PROGRAMMABLE

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

VARIABLE SPEED DRIVE DETAILS SCREEN
(APPLICABLE TO VSD WITH PART NUMBER 371-02767-XXX (60 HZ) OR 371-03700-XXX (50 HZ))

FIG. 21

00562VIP

OVERVIEW
This screen displays more detailed information pertain ing to a Variable Speed Drive (VSD). Service
Technicians refer to YORK Service Manual 160.55M1 for operation instructions and explanation of all
programmable setpoints and displayed values.
DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls is
commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value. For the Variable Speed Drive
this is the data returned by the VSD Logic board.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode or
a locally programmed value.
50

Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period if the value is non-zero.
Water Pump Output (LED)
Indicates whether the relay controlling the water pump
output is energized.
Precharge Relay Output (LED)
Indicates whether the relay controlling the precharge
output is energized.
Trigger SCR Output (LED)
Indicates whether the relay controlling the trigger SCR
output is energized.
DC Bus Voltage
Displays the DC Bus voltage as reported by the VSD.
DC Inverter Link Current
Displays the DC Inverter link current as reported by
the VSD.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Internal Ambient Temperature
Displays the ambient temperature inside the VSD cabinet as reported by the VSD.
Converter Heatsink Temperature
Displays the heatsink temperature of the converter as
reported by the VSD.
Baseplate Temperature
Displays the Baseplate temperature of the 3-phase voltage regulators as reported by the VSD.
VSD Model
Access Level Required: SERVICE
Displays the Horsepower conÞguration of the Variable
Speed Drive control.

rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
Pulldown Demand Limit
Access Level Required: OPERATOR
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the speciÞed pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
following chiller start-up.
Pulldown Demand Time
Access Level Required: OPERATOR
Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.

100% Full Load Amps
Displays the full load amps value as reported by the
VSD.

NAVIGATION

PROGRAMMABLE

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

YORK INTERNATIONAL

VSD
Access Level Required: VIEW
Returns to the VSD Screen.

OptiView Control Center
FORM 160.55-O1 (604)

ADAPTIVE CAPACITY CONTROL DETAILS SCREEN

FIG. 22

OVERVIEW
This screen displays more detailed information pertaining to a Adaptive Capacity Control (ACC).

Requires a login access level of SERVICE. Service Technicians refer to
YORK Service Manual 160.55-M1
for operation instructions and explanation of all programmable setpoints
and displayed values.
DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls is
commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value. For the Variable Speed Drive
this is the data returned by the VSD Logic board.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode or
a locally programmed value.

00362VIP

Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period if the value is non-zero.
VSD Output Frequency
Displays the frequency at which the VSD is operating
the motor.
Pre-Rotation Vane Position
Displays the pre-rotation vane position as a value between 0 and 100%.
Surge Count
The total number of surge conditions detected by the Adaptive Capacity Control. The surge events detected by the
Surge Protection feature are not included in this total.
Delta P/P
The value calculated by the Condenser and Evaporator
pressures as reported by the Adaptive Capacity Control.
PROGRAMMABLE
Local Motor Current Limit
Allows the user to specify the maximum allowed motor current (as a percentage of FLA). When the motor
current reaches this value, the pre-rotation vanes will
not be permitted to open further. If the motor current
rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Pulldown Demand Limit
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the speciÞed pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
following chiller start-up.
Pulldown Demand Time
Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.
Stability Limit
Adjusting this value modiÞes the pre-rotation vane control algorithm when used in conjunction with an ACC.
Surge Margin Adjust
When the ACC maps a surge point, it will begin to
adjust the chiller command frequency and vane controls at a certain “margin” from the mapped point. This
programmable value allows the service technician to
modify the “margin” at which these adjustments will
begin to take place.
Manual Surge Point
This key will force the ACC to map a surge detection
at the present operating conditions. Mapping a point at
these conditions will cause the ACC to make adjustments to the command frequency in the future in order

YORK INTERNATIONAL

to prevent the chiller from operating at the conditions
mapped. USE WITH CAUTION.
ACC Auto Map Print (Enabled / Disabled)
The chiller monitors the ACC communications and
when a surge point is mapped, a short report of system
parameters is printed. When this function is active, all
other printing capability is disabled.
ACC Map Report
The chiller requests the entire surge map from the ACC.
As the map is received, the parameters for each point
are printed.
Surge Map Clear
This key instructs the ACC to clear all of the surge points
presently mapped. This key will require conÞrmation of
its selection by entry of a special password. USE WITH
CAUTION.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
VSD
Access Level Required: VIEW
Returns to the VSD Screen.

OptiView Control Center
FORM 160.55-O1 (604)

HARMONIC FILTER DETAILS SCREEN
(STYLE D VSD AND VSD WITH PART NUMBER 371-03789-XXX
(503 HP 60 HZ; 410 HP 50 HZ

FIG. 23

OVERVIEW
This screen displays more detailed information pertaining to the IEEE-519 Harmonic Filter. Flash Memory
Card version C.MLM.02.04.xxx (and later) is required
for VSD part number 371-03789-xxx (503HP 60Hz;
419 HP 50Hz).
DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls
is commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value. For the Variable Speed Drive
this is the data returned by the VSD Logic board.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode
or a locally programmed value.
Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period if the value is non-zero.
54

00363VIP

Operating Mode (Run / Stop)
Indicates whether the Harmonic Filter is operating.
VSD Model
Access Level Required: SERVICE
Displays the horsepower for which the attached Harmonic Filter is conÞgured.
DC Bus Voltage
Displays the DC Bus voltage as measured by the Harmonic Filter.
Supply Contactor (LED)
Indicates whether the output to the Supply Contactor
is energized.
Precharge Contactor (LED)
Indicates whether the output to the Precharge Contactor
is energized.
Phase Rotation
Displays the phase rotation detected by the Harmonic
Filter (A, B, C or C, B, A)
Total Supply kVA
Displays the total supply KiloVolt-Amps measured by
the Harmonic Filter.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Heatsink Temperature
(Labeled “Baseplate Temperatures” on VSD with
part number 371-03789-xxx {503HP 60Hz; 419HP
50Hz}).
Displays the temperature of the Harmonic Filter Heatsink.
Voltage Peak (N-L1, N-L2, N-L3)
Displays the 3-phase peak voltages as measured by the
Harmonic Filter (Neutral to Line).
RMS Voltage (L1-L2, L2-L3, L3-L1)
Displays the 3-phase RMS Voltages across each line.
Voltage Total Harmonic Distortion (L1, L2, L3)
Displays the 3-phase voltage Total Harmonic Distortion
(THD) measurements.
RMS Filter Current (L1, L2, L3)
Displays the 3-phase Filter current values as measured
by the Harmonic Filter.
Supply Current Total Demand Distortion
(L1, L2, L3)
Displays the 3-phase Current Total Demand Distortion
(TDD) measurements.
RMS Supply Current (L1, L2, L3)
Displays the 3-phase RMS Voltages across each line.
PROGRAMMABLE

tor current (as a percentage of FLA). When the motor
current reaches this value, the pre-rotation vanes will
not be permitted to open further. If the motor current
rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
Pulldown Demand Limit
Access Level Required: OPERATOR
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the speciÞed pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
following chiller start-up.
Pulldown Demand Time
Access Level Required: OPERATOR
Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
VSD
Access Level Required: VIEW
Returns to the VSD Screen.

Local Motor Current Limit
Access Level Required: OPERATOR
Allows the user to specify the maximum allowed mo-

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

HARMONIC FILTER DETAILS SCREEN
(VSD WITH PART NUMBER 371-02767-XXX (60 HZ) OR 371-03700-XXX (50 HZ))

FIG. 24

OVERVIEW
This screen displays more detailed information pertaining to the IEEE-519 Harmonic Filter.
DISPLAY ONLY
Motor Run (LED)
Indicates whether the digital output from the controls
is commanding the motor to RUN.
Motor Current % Full Load Amps
Displays the motor current as a percentage of the Full
Load Amps (FLA) value. For the Variable Speed Drive
this is the data returned by the VSD Logic board.
Current Limit Setpoint
Displays the current limit value in use. This value could
come from a 0-20mA, 4-20mA, 0-10VDC or 2-10VDC
input in Analog Remote mode, PWM signal in Digital
Remote mode, MicroGateway interface in ISN mode
or a locally programmed value.
Pulldown Demand Time Left
Displays the time remaining in the programmed pulldown period if the value is non-zero.
Operating Mode (Run / Stop)
Indicates whether the Harmonic Filter is operating.
56

00567VIP

VSD Model
Access Level Required: SERVICE
Displays the horsepower for which the attached Harmonic Filter is conÞgured.
DC Bus Voltage
Displays the DC Bus voltage as measured by the Harmonic Filter.
Supply Contactor (LED)
Indicates whether the output to the Supply Contactor
is energized.
Precharge Contactor (LED)
Indicates whether the output to the Precharge Contactor
is energized.
Phase Rotation
Displays the phase rotation detected by the Harmonic
Filter ( A, B, C or C, B, A )
Total Supply KVA
Displays the total supply KiloVolt-Amps measured by
the Harmonic Filter.
Baseplate Temperature
Displays the temperature of the Harmonic Filter Baseplate.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Voltage Peak ( N-L1, N-L2, N-L3 )
Displays the 3-phase peak voltages as measured by the
Harmonic Filter (Neutral to Line).
RMS Voltage ( L1-L2, L2-L3, L3-L1 )
Displays the 3-phase RMS Voltages across each line.
Voltage Total Harmonic Distortion ( L1, L2, L3 )
Displays the 3-phase voltage Total Harmonic Distortion
(THD) measurements.
RMS Filter Current ( L1, L2, L3 )
Displays the 3-phase Filter current values as measured
by the Harmonic Filter.
Supply Current Total Demand Distortion
( L1, L2, L3 )
Displays the 3-phase Current Total Demand Distortion
(TDD) measurements.

current reaches this value, the pre-rotation vanes will
not be permitted to open further. If the motor current
rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
Pulldown Demand Limit
Access Level Required: OPERATOR
Allows the user to specify the current limit value (as a
percentage of FLA) to which the chiller will be limited
during the speciÞed pulldown limit time. This value will
override the Motor Current Limit value during this time
period. This function is used to provide energy savings
following chiller start-up.
Pulldown Demand Time
Access Level Required: OPERATOR
Allows the user to set a period of time for which the
pulldown demand limit will be in effect after the chiller
starts.

RMS Supply Current L1, L2, L3
Displays the 3-phase RMS Voltages across each line.

NAVIGATION

PROGRAMMABLE

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

Local Motor Current Limit
Access Level Required: OPERATOR
Allows the user to specify the maximum allowed motor current (as a percentage of FLA). When the motor

YORK INTERNATIONAL

VSD
Access Level Required: VIEW
Returns to the VSD Screen.

OptiView Control Center
FORM 160.55-O1 (604)

SETPOINTS SCREEN

FIG. 25

OVERVIEW
This screen provides a convenient location for programming the most common setpoints involved in the chiller
control. This screen also serves as a gateway to a subscreen
for deÞning the setup of general system parameters.
DISPLAY ONLY
Leaving Chilled Liquid Temperature - Setpoint
Displays the present setpoint to which the chiller is operating whether controlled remotely or locally. This value
could come from a 0-20mA, 4-20mA, 0-10VDC or 210VDC input in Analog Remote mode, PWM signal in
Digital Remote mode, MicroGateway interface in ISN
mode or a locally programmed value.
Leaving Chilled Liquid Temperature Cycling - Shutdown
Displays the Leaving Chilled Liquid Temperature at
which the chiller will shut down to avoid over-cooling
the building. This value is calculated by subtracting the
Leaving Chilled Liquid Temperature Cycling Offset
– Shutdown from the Leaving Chilled Liquid Temperature Setpoint. If this value is below the absolute
minimum allowed shutdown temperature the minimum
value is displayed.
Leaving Chilled Liquid Temperature Cycling – Restart
Displays the Leaving Chilled Liquid Temperature at which
58

00364VIP

the chiller will restart after it has shut down due to overcooling temperature. This value is calculated by adding
the Leaving Chilled Liquid Temperature Cycling Offset
– Restart to the Leaving Chilled Liquid Temperature
Setpoint.
Current limit Setpoint
Displays the active Current Limit setpoint. In Local
mode, this is the locally programmed Current Limit
setpoint. In ISN remote mode, this is the setpoint received from the MicroGateway interface. In Analog remote mode, this is the setpoint received via 0-10VDC,
2-10VDC, 0-20mA or 4-20mA input. In Digital remote
mode, this is the Pulse Width Modulation input.
PROGRAMMABLE
Local Leaving Chilled Liquid Tem per a ture Range Access Level Required: OPERATOR
This is the range over which an analog signal (0-20mA, 420mA, 0-10VDC or 2-10VDC) in Analog Remote Mode
or a digital signal (PWM) in Digital remote mode can reset
the Leaving Chilled Liquid Temperature setpoint above
the operator programmed Base Setpoint (see below).
Programmable as either 10°F or 20°F, with a default
of 20°F, it is added to the BASE value to create a range
over which the remote device can reset the setpoint. For
example, if this setpoint is programmed for 10°F and
the operator programmed value is 45°F, then the remote
device can set the Leaving Chilled Liquid Temperature
setpoint over the range 45.0° - 55.0°F.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Local Leaving Chilled Liquid Tem per a ture Setpoint
Access Level Required: OPERATOR
This value allows the user to deÞne the Leaving Chilled
Liquid Temperature that is to be maintained by the chiller.
It is programmable over the range of 38.0°F to 70.0°F
(water) or 10.0°F to 70.0°F (brine). If Smart Freeze is
enabled, the range is 36.0°F to 70.0°F (water). A remote
device can provide an analog signal (0-20mA, 4-20mA,
0-10VDC or 2-10VDC) in Analog Remote mode or PWM
signal in Digital Remote mode that changes the setpoint
by creating an offset above the operator programmed
BASE Leaving Chilled Liquid Temperature setpoint.
This offset may be deÞned up to 10.0°F or 20.0°F above
the BASE setpoint (see the Remote Leaving Chilled Liquid Temperature Setpoint Range description above).
Additionally, a MicroGateway (in ISN Remote mode)
can deÞne the setpoint through a serial data stream. In
this case, the incoming setpoint is not an offset that is
applied to the locally programmed BASE setpoint value,
but rather is the setpoint value itself.
Leaving Chilled Liquid Temperature
Cycling Offset - Shutdown
Access Level Required: OPERATOR
This value allows the user to specify the Leaving Chilled
Liquid Temperature at which the chiller will shut down
on a LEAVING CHILLED LIQUID – LOW TEMPERATURE cycling shutdown. This is done by deÞning
an offset below the Leaving Chilled Liquid Temperature
setpoint. It is programmable over a range of 1°F to 64°F
below the setpoint, to a minimum cutout of 36°F (water),
34°F (water with Smart Freeze enabled) or 6°F (brine).
It establishes the minimum allowed temperature for the
Leaving Chilled Liquid Temperature and prevents overcooling of the building. Anytime the Leaving Chilled
Liquid Temperature setpoint is increased, the shutdown
threshold is 36.0°F (water) or 6.0°F (brine) for the next
ten (10) minutes. If Smart Freeze is enabled, the threshold is 34.0°F for the next 10 minutes. After ten (10)
minutes have elapsed, the shutdown threshold becomes
the programmed setpoint value.
Leaving Chilled Liquid Temperature
Cycling Offset - Restart
Access Level Required: OPERATOR
This value allows the user to specify the Leaving Chilled
Liquid Temperature at which the chiller will restart after a
shutdown on a LEAVING CHILLED LIQUID – LOW
TEMPERATURE cycling shutdown. This is done by
deÞning an offset above the Leaving Chilled Liquid
Temperature setpoint. It is programmable over a range
of 0°F to 70°F above the setpoint, to a maximum restart
YORK INTERNATIONAL

value of 80°F. The chiller will automatically restart when
this temperature is reached. This setpoint can be used
to reduce chiller cycling by delaying the chiller restart
until the cooling load has increased.
Remote Analog Input Range
Access Level Required: OPERATOR
This setpoint deÞnes, for the Control Center, the remote
signal range applied for remote reset of the Leaving
Chilled Liquid Temperature Setpoint and Current Limit
Setpoint in ANALOG remote mode. If the remote
signal is 0-10VDC or 0-20mA, this setpoint must be
programmed for 0-10VDC. If the remote signal is 210VDC or 4-20mA, this setpoint must be programmed
for 2-10VDC.
Local Motor Current Limit
Access Level Required: OPERATOR
Allows the user to specify the maximum allowed motor current (as a percentage of FLA). When the motor
current reaches this value, the pre-rotation vanes will
not be permitted to open further. If the motor current
rises above this value, the pre-rotation vanes will close
to reduce the current to this value.
Pulldown Demand Limit
Access Level Required: OPERATOR
Allows the user to specify the current limit value (as
a percentage of Full Load Amps) to which the chiller
will be limited during the speciÞed pulldown limit time.
This value will override the Motor Current Limit value
during this time period. This function is used to provide
energy savings following chiller start-up.
Pulldown Demand Time
Access Level Required: OPERATOR
Allows the user to set a period of time for which the pulldown
demand limit will be in effect after the chiller starts.
Print
Access Level Required: VIEW
Generates Setpoints print report.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Setup
Access Level Required: VIEW
Moves to the subscreen allowing setup of general system
parameters.
59

OptiView Control Center
FORM 160.55-O1 (604)

SETUP SCREEN

FIG. 26

OVERVIEW
This screen is the top level of the general conÞguration
parameters. It allows programming of the time and
date, along with speciÞcations as to how the time will
be displayed (12 or 24 hour format). In addition, the
chiller conÞguration, as determined by the state of the
Microboard Program Jumpers and Program Switches
is displayed. A qualiÞed Service Technician, following instructions in YORK Service Manual 160.55-M1,
establishes this conÞguration per the desired operation.
This screen also serves as a gateway to more subscreens
for deÞning general system parameters
DISPLAY ONLY
031-01730-000 Microboard
Chilled Liquid Pump Operation:
Displays Standard or Enhanced
Motor Type:
Displays Fixed Speed or Variable Speed
Refrigerant Selection:
Displays R-11 or R123

LD09562

Power Failure Restart:
Displays Manual or Automatic
Liquid Type:
Displays Water or Brine
Coastdown:
Displays Standard (150 seconds) or Enhanced (15
minutes – Steam Turbine applications)
Pre-Run:
Displays Standard (30 seconds) or Extended (180
seconds)
Power Line Frequency (VSD only):
Displays 60 Hz or 50 Hz
031-02430-000 Microboard
Refrigerant Selection
Displays R11 or R123
Liquid Type
Displays Water or Brine

Anti-Recycle:
Displays Disabled or Enabled

YORK INTERNATIONAL

FORM 160.55-O1 (604)

PROGRAMMABLE
Set Date
Access Level Required: OPERATOR
Allows the user to specify the present date. This value is critical to logging system shutdowns accurately and for utilizing
the scheduling capabilities. When prompted to enter a date
value, the user must enter the day, month and four-digit year
(using leading zeroes as necessary). If within range, the value
will be accepted. If out of range, the user is prompted for the
information again. At this point the user may retry the date
entry or cancel the programming attempt.
Set Time
Access Level Required: OPERATOR
Allows the user to specify the present time. This value
is critical to logging system shutdowns accurately and
for utilizing the scheduling capabilities. When prompted
to enter a time value, the user must enter the hour and
minute desired (using leading zeroes as necessary). If
the chiller is presently set to 24-hour mode, the time
must be entered in the 24-hour format. Otherwise, the
user must also select AM or PM for the entered time. If
out of range, the user is prompted for the information
again. At this point the user may retry the time entry or
cancel the programming attempt.
Clock (Enabled / Disabled)
Access Level Required: OPERATOR
Allows the user to enable or disable the real-time clock in
order to conserve battery life. The clock will be disabled
during manufacturing and must be enabled at system commissioning. In addition, when preparing for prolonged
shutdown the clock should once again be disabled.
12/24 Hr
Access Level Required: OPERATOR
Allows the user to specify the format in which the time
will be presented to the user. This setpoint will affect the
display of the time on the chiller panel and on all reports
generated. 12-Hour time format will include the AM and
PM modiÞers and show the range of time between 1:00
and 12:59, while the 24-Hour time format will show the
range of time between 0:00 and 23:59.

can be changed. Use the ▲ and ▼ keys to place the
selection box around the desired setpoint. With the
setpoint selected, press the ENTER (√) key. A dialog
box appears with the range of settings.
Chilled Liquid Pump Operation
Access Level Required: SERVICE
Allows a Service Technician to select chilled liquid
pump control contacts (I/O Board TB2-44/45) operation as either Standard or Enhanced. Service Technicians
refer to YORK Service Manual 160.55-M1.
Motor Drive Type
Access Level Required: SERVICE
Allows a Service Technician to enter the applied compressor motor type as either electro-mechanical (EM),
Solid State Starter (SSS-Mod A), Solid State starter (SSS
– Mod B), Variable Speed Drive-60Hz or Variable Speed
Drive-50Hz. Service Technicians refer to YORK Service
manual 160.55-M1.
Anti-Recycle
Access level Required: SERVICE
Allows a Service Technician to Enable or Disable the
anti-recycle timer. Service Technicians refer to YORK
Service manual 160.55-M1.
Power Failure Restart
Access Level Required: OPERATOR
Allows the user to select Manual or Automatic restart
after power failure.
Coastdown
Access Level Required: SERVICE
Allows a Service Technician to select either Standard
(150 seconds) or Enhanced 15 minutes –Steam Turbine
applications). Service Technicians refer to YORK Service manual 160.55-M1.
Pre-Run
Access Level Required: SERVICE
Allows Service Technician to select either Standard (30
seconds) or Extended (180 seconds)

. 031-02430-000 Microboard only
Change Settings
Access Level Required: OPERATOR
Used to enter the following setpoints. Pressing this key
places a green selection box around the Þrst changeable
setpoint. The access level determines which setpoints

YORK INTERNATIONAL

NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

OptiView Control Center
FORM 160.55-O1 (604)

Schedule
Access Level Required: VIEW
Moves to the subscreen allowing deÞnition of the chiller
operation schedule.
Diagnostics
Access Level Required: SERVICE
Moves to the subscreen allowing limited diagnostic
capability while operating. Refer to YORK Service
Manual 160.55-M1
Comms
Access Level Required: VIEW
Moves to the subscreen allowing conÞguration of system
communications.

Printer
Access Level Required: VIEW
Moves to the subscreen allowing conÞguration and
control of printer functions.
Sales Order
Access Level Required: VIEW
Moves to the subscreen displaying the Sales Order information for the chiller system.
Operations
Access Level Required: VIEW
Moves to the subscreen displaying operating parameters
of the chiller system.
User
Access Level Required: VIEW
Moves to the subscreen allowing conÞguration of user
preferences.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

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YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

SCHEDULE SCREEN

FIG. 27

OVERVIEW
The schedule screen contains more programmable values
than a normal display screen. As such, each programmable value is not linked to a speciÞc button. Instead the
Select key is used to enable the cursor arrows which
are used to highlight the day and the start or stop time
the user wishes to modify. At this point the user may
press the ‘!’ (ENTER) key to program the Start / Stop
times for that day.
In order for the Start / Stop combination to be utilized,
each Start time must have a corresponding Stop time
which occurs later in the day. The presently programmed
schedule for a given day can be cancelled by setting
both the Start time and Stop time to 12:00AM. If the
Start time equals the Stop time (with any time other
than 12:00AM), the chiller is OFF for that day. If the
user desires the chiller to operate continuously through
several days, the Stop time of Day 1 can be set to 11:
59 PM and the Start time of Day 2 can be set to 12:00
AM. The chiller will not stop but continue to operate
until the stop of Day 2.
The user has the ability to deÞne a standard set of Start /
Stop times which are utilized every week. The user may
then specify exception Start / Stop combinations for any
day of the week up to 6 weeks in advance. At the end
of each week the schedule for the next week is created
by combining the standard week deÞnition and the next
64

00365VIP

deÞned exception week. The schedule is then updated
as each of the exception weeks “shifts down”, leaving a
new, blank exception week in the 6th week slot.
DISPLAY ONLY
None
PROGRAMMABLE
Standard Week Start/Stop Times
Access Level Required: OPERATOR
For each day of the week, the user may specify a time
for the chiller to start and a time for the chiller to stop.
The times speciÞed in this entry week will be used as
the default for every week of chiller operation.
Exception Start/Stop Times
Access Level Required: OPERATOR
For each day of the week, the user may specify a time
for the chiller to start and a time for the chiller to stop.
These Start / Stop combinations may be scheduled up to
Þve (5) weeks in advance and also for the present week.
As each week goes by, the new schedule will be created
for the present week using the Exception speciÞcation
in combination with the Standard week deÞnition, as
described above.
Schedule (Enabled / Disabled)
Access Level Required: OPERATOR
Allows the user to enable or disable the monitoring funcYORK INTERNATIONAL

FORM 160.55-O1 (604)

tion which enforces the scheduled starting and stopping
of the chiller.

Use ◄ , ► , ▲ or ▼ cursor arrows to place the box
around the desired start or stop time for a given day.

Repeat Sunday Schedule
Access Level Required: OPERATOR
Duplicates the schedule deÞned for Sunday for the
remainder of the standard weekdays.

Print
Access Level Required: VIEW
Generates a Schedule print report.
NAVIGATION

Reset All Exception Days
Access Level Required: OPERATOR
Deletes all programming for exception days within the
next 6 weeks.

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

Select
Access Level Required: OPERATOR
Places a selection box around a start time for a given day.

Setup
Access Level Required: VIEW
Return to the previous setup screen.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

USER SCREEN

FIG. 28

OVERVIEW
This screen allows deÞnition of custom User ID’s and
matching passwords. This allows the building administrator to assign custom passwords to those who are
authorized to maintain the chiller.
Each Custom User value is not linked to a speciÞc button.
Instead, the Change button is pressed which enables the
cursor arrows which are used to highlight the Custom User
parameter the user wishes to modify. At this point the ‘!’
(Enter) button is pressed and the value may be entered.
DISPLAY ONLY
None
PROGRAMMABLE
System Language
Access Level Required: OPERATOR
Allows the user to deÞne the language for all Screens.
The desired language is selected by scrolling through the
list of those available. English is the Default language
and is selected by pressing the ▲ key when the dialog
box appears during the selection process. The selected
language will not be displayed until after the user
navigates from the USER Screen to another Screen.
English / Metric Units
Access Level Required: OPERATOR
DeÞne the unit system (English or Metric) used by the
chiller display.
66

00366VIP

Custom User ID (4)
Access Level Required: SERVICE
This allows the user to specify up to four (4) Custom User
ID values. Each user ID will then require a corresponding
Password and User Level. A User ID can be deÞned for
various maintenance personnel. Service Technicians refer
to YORK Service Manual 160.55-M1.
Custom User Password (4)
Access Level Required: SERVICE
This allows the user to specify up to four (4) Custom
Password values. Each Password will then require a corresponding User ID and User Level. Service Technicians
refer to YORK Service Manual 160.55-M1.
Custom User Access Level (4)
Access Level Required: SERVICE
This allows the user to specify up to four (4) Custom User
Access Levels. Each Access Level will then require a corresponding Password and User ID. Service Technicians
refer to YORK Service Manual 160.55-M1.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Setup
Access Level Required: VIEW
Return to the Setup Screen.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

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OptiView Control Center
FORM 160.55-O1 (604)

COMMS SCREEN

FIG. 29

00478VIP

OVERVIEW
(Screen shown from Flash Memory Card version
C.MLM.02.02.xxx and later. Screen layout from
earlier versions slightly different)
This screen allows deÞnition of the necessary communications parameters. Refer to PRINTER Section
of this book for details of the Printer connections and
setup. Presently, there are no COM 2 communications
features available.
DISPLAY ONLY
None
PROGRAMMABLE
Chiller ID
Access Level Required: OPERATOR
DeÞne the numeric chiller ID when used within an ISN
network of chillers. This ID number is also printed at
the top of reports obtained with a local printer.
Printer Setup and COM 2 Setup
Access Level Required: OPERATOR
Pressing either key places a green selection boxa around
the Þrst changeable parameter. Use the ▲ and ▼ keys
to place the selection box around the desired parameter
to be changed. With the selection box around the desired
parameter, press the ENTER (✓) key. A dialog box is
displayed permitting data entry.
68

Printer Baud Rate
DeÞne the baud rate at which the panel shall communicate to the printer.
Printer Data Bit(s)
DeÞne the number of data bits with which the panel shall
communicate to the printer.
Printer Parity Bit(s)
DeÞne the number of parity bits with which the panel
shall communicate to the printer.
Printer Stop Bit(s)
DeÞne the number of stop bits with which the panel shall
communicate to the printer.
COM 2 Baud Rate
DeÞne the baud rate at which the panel shall communicate through the modem port.
COM 2 Data Bit(s)
DeÞne the number of data bits at which the panel shall
communicate through the modem port.
COM 2 Parity Bit(s)
DeÞne the number of parity bits at which the panel shall
communicate through the modem port.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

COM 2 Stop Bit(s)
DeÞne the number of stop bits at which the panel shall
communicate through the modem port.

Setup
Access Level Required: VIEW
Return to the Setup Screen.

NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

PRINTER SCREEN

FIG. 30

OVERVIEW
This screen allows deÞnition of the necessary communications parameters for the printer. Refer to PRINTER
section of this book for details of the Printer connections
and setup.
DISPLAY ONLY
Time Remaining Until Next Print
Displays the time until the next print log will occur, if
the function is enabled.
PROGRAMMABLE
Log Start Time
Access Level Required: OPERATOR
Set the time at which scheduled print logs will begin.
Output Interval
Access Level Required: OPERATOR
DeÞne the interval at which log printing will occur.
Automatic Printer Logging (Enabled / Disabled)
Access Level Required: OPERATOR
Enable the printer to begin printing status reports beginning at the programmed start time and recurring at
the interval deÞned above.
Printer Type
Access Level Required: OPERATOR
DeÞne the printer type connected to the chiller system.
70

00368VIP

ACC Auto Map Print (Enabled / Disabled)
Access Level Required: SERVICE
Only available if the chiller system utilizes a Variable
Speed Drive motor controller. The chiller monitors
the ACC communications and when a surge point is
mapped, a short report of system parameters is printed.
When this function is active, all other printing capability
is disabled.
ACC Map Report
Access Level Required: SERVICE
Only available if the chiller system utilizes a Variable
Speed Drive motor controller. The chiller requests the
entire surge map from the ACC. As the map is received,
the parameters for each point are printed.
Print Report
Access Level Required: OPERATOR
Select the report type to print when the Print Report key is
selected. This can vary from Status report (present system
parameters), Setpoints report (present value of the system
setpoints), Schedule report (present value of the system
schedule times) or a Sales Order Data report (information provided on the Sales Order screen). A print report
is generated upon completion of selection.
Print All Histories
Access Level Required: OPERATOR
Generate a report of the system data at the time of all
stored shutdowns.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Setup
Access Level Required: VIEW
Return to the Setup Screen.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

SALES ORDER SCREEN

FIG. 31

OVERVIEW
This screen allows deÞnition of the sales order parameters.
The Commissioning date is entered by the YORK Service
Technician at the time of chiller commissioning. These
values should never be changed or entered by anyone other
than a qualiÞed Service Technician. Entry instructions are
included in the YORK Service Manual 160.55-M1. The
remainder of the values are entered at the YORK Factory
during the manufacturing of the chiller.
DISPLAY ONLY
Model Number
Factory deÞned model number of the chiller system.
Panel Serial Number
Factory deÞned serial number for the micropanel.
Chiller Serial Number
Factory deÞned serial number for the chiller system.

00369VIP

Nameplate Information
Factory deÞned information about the chiller motor
conÞguration.
PROGRAMMABLE
Commissioning Date
Access Level Required: SERVICE
Define the date at which the chiller was commissioned.
Job Name and Location
Access Level Required: SERVICE
Factory deÞned job name and location the chiller is
destined for.
Print
Access Level Required: VIEW
This generates a listing of the Sales Order data
NAVIGATION

YORK Order Number
Factory deÞned order number under which the chiller
was sold.

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.

System Information
Factory deÞned conditions for which the chiller was
originally rated and sold.

Setup
Access Level Required: VIEW
Return to the Setup Screen.

Condenser and Evaporator Design Load Information
Factory deÞned description of the condenser and evaporator conÞguration at time of shipment.
72

YORK INTERNATIONAL

FORM 160.55-O1 (604)

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YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

OPERATIONS SCREEN

FIG. 32

OVERVIEW
This screen allows deÞnition of general parameters having to do with the operation of the chiller.
DISPLAY ONLY
Chiller Run Time
(Flash memory Card version C.MLM.02.01 or later)
Displays the amount of time the chiller has been running
since the last start signal was received. Value is reset to
zero when the chiller enters Coastdown. It remains at
zero while shutdown and during “System Prelube”.
PROGRAMMABLE
Control Source
Access Level Required: OPERATOR
DeÞne whether the control of the chiller will be Local,
Digital Remote, Analog Remote, Modem Remote or
ISN Remote.
Number of Starts
Access Level Required: ADMIN
Displays the number of the starts the chiller has initiated.
This may be reprogrammed to a desired value, (generally
when this value has been reset due to a Microboard replacement), but should not be done so arbitrarily.

00479VIP

Operating Hours
Access Level Required: ADMIN
Displays the total accumulated run time of the chiller.
This may be reprogrammed to a desired value (generally
when this value has been reset due to a Microboard replacement), but should not be done so arbitrarily.
Hot Gas Bypass (Enabled/Disabled)
Access level required: SERVICE
Enables and disables the hot gas bypass feature.
Refrigerant Level Control (Enabled/Disabled)
Access Level Required: SERVICE
Enables and Disables the Refrigerant Level Control
feature.
Service Phone Numbers
(Flash Memory Card version C.MLM.02.02.xxx
and later)
Access Level Required: SERVICE
Displays up to two service phone numbers. The Regional
service phone number is displayed as the Þrst number.
Although the label and number can be changed appropriately, the default for this entry is “York Intl North
American Toll Free Number 1-800-861-1001”. The
Local service phone number is displayed as the second
number. Although blank by default, the appropriate label
and number can be entered by a Service Technician. Service Technicians refer to Service Manual 160.55-M1.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Setup
Access Level Required: VIEW
Return to the Setup Screen.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

HISTORY SCREEN

FIG. 33

OVERVIEW
This screen allows the user to browse through the faults.
In order to get a more thorough reporting of the system
conditions at the time of the recorded shutdown, move
to the subscreen HISTORY DETAILS.
The user may use the Select Fault button to select the
history to view. At this point the View Details button
is used to jump to a subscreen containing stored chiller
parameters values at the time of the shutdown. Additionally, the Print History button can be used to generate
a hard-copy report of the parameter values at the time
of the shutdown.
DISPLAY ONLY
Last Normal Shutdown
This window displays the date and time and the description of the last normal shutdown. A normal shutdown
is deÞned as:
- Local (Panel rocker switch)
- Remote (Digital, Analog or ISN)
Last Fault While Running
This window displays the date and time and the description of the last safety or cycling shutdown while
the system was running.

00565VIP

Last Ten Faults
This window displays a chronological listing (most
recent Þrst) of the date and time and the description of
the last ten safety or cycling shutdowns that occur while
the system is running or stopped.
PROGRAMMABLE
Print History
Access Level Required: VIEW
This generates a report listing the status of the chiller
parameters at the time of the selected shutdown.
Print All Histories
Access Level Required: VIEW
This generates a report listing the status of the chiller
parameters at the time of each of the stored shutdowns.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
View Details
Access Level Required: VIEW
Causes a move to a subscreen containing the value of
select chiller parameters at the time of the associated
shutdown.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Trending
Access Level Required: VIEW
Causes a move to a subscreen allowing the user to view
trending data on selected chiller parameters.
Custom View
(Flash memory Card version C.MLM.02.01 or later)
Access Level required: VIEW
Causes a move to a sub-screen allowing the user to view
the Custom Setup Screen.

YORK INTERNATIONAL

Security Log
(Flash Memory Card version C.MLM.02.03.xxx
and later)
Access Level Required: SERVICE
Causes a move to a sub-screen allowing the user to view
a record of the last 75 setpoint changes.

OptiView Control Center
FORM 160.55-O1 (604)

HISTORY DETAILS SCREEN

FIG. 34

OVERVIEW
This screen allows the user to see an on-screen printout
of all the system parameters at the time of the selected
shutdown. Not all screens are shown above. Number
of screens required to display all of the data varies according to type of motor starter and options applied.

00566VIP

Page Down
Access Level Required: VIEW
Scroll down in the displayed data (if applicable).
Print History
Access Level Required: VIEW
This generates a report listing the status of the chiller
parameters at the time of the selected shutdown.

DISPLAY ONLY
NAVIGATION
History Printout
This is the on-screen printout of the system parameters.
PROGRAMMABLE
Page Up
Access Level Required: VIEW
Scroll up in the displayed data (if applicable).

Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
History
Access Level Required: VIEW
Causes a return to the History Screen.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

SECURITY LOG SCREEN

FIG. 35

00563VIP

OVERVIEW

PROGRAMMABLE

(This screen only available with Flash Memory Card
version C.MLM.02.03.xxx and later)

Log Entry
Allows the user to select a particular setpoint change
for detail viewing.

This screen displays a listing of the last 75 setpoint
changes. They are listed and numbered in reverse order
in which they were changed, with the most recent listed as
number 1. Multiple pages are necessary to display all 75
changes. Not all setpoints are logged. Service technicians
refer to list in YORK Service Manual 160.55-M1.

Requires a login access level of
SERVICE.

Print
Generates a detailed report of all setpoint changes listed
in the setpoint change log.
Page Up
Scroll up in the displayed data (if applicable).
Page Down
Scroll down in the displayed data (if applicable).
NAVIGATION

DISPLAY ONLY
Category
Displays the category of the setpoint (motor, evaporator,
condenser, etc.)
Setpoint
Displays the setpoint that was changed.
New Value
Displays the value that was entered at the time of the
setpoint change.
YORK INTERNATIONAL

Home
Access Level Required: SERVICE
Causes an instant return to the Home Screen.
History
Access Level Required: SERVICE
Causes an instant return to the History Screen.
View Details
Access Level Required: SERVICE
Causes a move to a sub-screen containing the details of
the setpoint change selected with the Log Entry key.
79

OptiView Control Center
FORM 160.55-O1 (604)

SECURITY LOG DETAILS SCREEN

FIG. 36

OVERVIEW
(This screen only available with Flash Memory Card
version C.MLM.02.03.xxx and later)
This screen allows the user to view the details of a logged
setpoint change, selected from the list on the Security
Log Screen. The date and time the setpoint was changed,
the new and old setpoint value and access level and user
ID used to make the change are displayed. The data on
this screen can be printed.

Requires a login access level of
SERVICE.

00564VIP

Access Level
Displays the Login Access Level used to make the
setpoint change.
User ID
Displays the Login User ID used to make the setpoint
change.
Old Value
Displays the previous setpoint value.
New Value
Displays the value entered at the time of the setpoint
change.
PROGRAMMABLE

DISPLAY ONLY
Description
Displays the setpoint/category that was changed.
Time
Displays the time the setpoint was changed.
Date
Displays the date the setpoint was changed.

Print
Generates a report of change parameters displayed on
this screen.
NAVIGATION
Home
Access Level Required: SERVICE
Causes an instant return to the Home Screen.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Security Log
Access Level Required: SERVICE
Causes an instant return to the Security Log Screen.
View Details
Access Level Required: SERVICE
Causes a move to a sub-screen containing the details of
the setpoint change selected with the Log Entry key.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

TREND SCREEN

FIG. 37

OVERVIEW
As many as six Operator selected parameters (Data
Points) can be plotted in an X/Y graph format. The XAxis is scaled per the selected Data Collection Interval
and displayed in a time of day or elapsed time format, as
selected with the X-axis toggle key. The Y-Axis is scaled
for each parameter per the selected minimum and maximum value for each parameter. Analog parameters are
scaled in pressure, temperature, volts, amps, hertz or time.
Digital on/off parameters are scaled as zero (off) and one
(on). Only one Y-Axis label is displayed at a time. The
Y-Axis Toggle Key is used to toggle the Y-Axis labels
through the different parameters. The Y-Axis label that
is being displayed is identiÞed at the top of the graph.
For identiÞcation, each plotted parameter and associated
Y-Axis labeling is color coordinated.
With Flash Memory Card version C.MLM.02.01.xxx
and earlier, all trended Data Points are displayed
si mul ta neous ly. With Flash Memory Card version
C.MLM.02.02.xxx and later, the DATA SELECT key
is used to display all trended Data Points simultaneously
or select a single Data Point for display.
The parameters are sampled at the selected Data Collection Interval and plotted using 450 data points across
the X-Axis. If the actual value of the sampled parameter
is less than the Y-Axis label minimum for that parameter,
the value will be plotted at the minimum value. Simi82

00480VIP

larly, if the actual value is greater than the Y-Axis label
maximum for that parameter, the value will be plotted
at the maximum value.
There are three types of charts that can be created:
ONE SCREEN, CONTINUOUS or TRIGGERED
(not applicable to Flash Memory Card version
C.MLM.02.01.xxx and earlier). When plotting reaches
the end of the X-axis, if ONE SCREEN is selected,
trending stops and data is frozen. If CONTINUOUS is
selected, the oldest data is dropped from the left-hand
side of the graph at the next collection interval. Thereafter, the oldest data is dropped from the left hand-side
of the graph at each data collection interval. If TRIGGERED is selected, data collection can be set to start
or stop based upon the selected TRIGGER ACTION
(START or STOP). If START is selected, data collection
will not begin until the Triggers have been satisÞed and
any selected TRIGGER DELAY has elapsed. Data collection will stop at the completion of one screen of data
as with the ONE SCREEN. If STOP is selected, data collection will not stop until the Triggers have been satisÞed
and any selected TRIGGER DELAY has elapsed.
If a power failure occurs while the trending is running,
the trending is stopped. Upon restoration of power, the
last screen of data that was collected will be displayed
on the trending screen. The START key must be pressed
to initiate a new trend screen.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

DISPLAY ONLY
This screen allows the user to view the graphical trending of the selected parameters and is also a gateway to
the graph setup screens.

A red screen with the words “TREND
MAX MUST BE > TREND MIN” will
appear if the Y-Axis minimum has
been programmed to a value that is
greater than the Y-Axis maximum for
any parameter. If this appears, proceed
to the Trend Setup Screen to change
the values.
PROGRAMMABLE
Start
Access Level Required: OPERATOR
Pressing this key clears the graph, starts a new graph,
sets the time of day to the present clock time and begins
the trending. This key is only available if trending is
stopped. If the selected Chart Type is TRIGGERED and
TRIGGER ACTION is set to START, data collection
will not begin until the Triggers have been satisÞed and
any selected TRIGGER DELAY has elapsed. Otherwise,
data collection will begin immediately.
Stop
Access Level Required: OPERATOR
Pressing this key stops the trending. The trend data
is frozen on the display until another graph is started
with the START key. The STOP key is only available if
trending is running.
Data Select
(Flash Memory Card version C.MLM.02.02.xxx
and later)
Access Level required: VIEW
Allows the user to display all trended data points simultaneously or select a single trended data point for display,
hiding the other data points. Selections are ALL DATA
or DATA POINT X (1-6).

YORK INTERNATIONAL

Print
(Flash Memory Card version C.MLM.02.02.xxx
and later)
Access Level Required: VIEW
Allows the data on the trend screen to be printed in
tabular format. If set to EXISTING, a snapshot of the
data presently on the screen is sent to the printer. If set
to NEW, all data collected after pressing this key will be
sent to the printer as it is collected. If set to DISABLED,
no data is sent to the printer. Refer to PRINTERS section
of this book for printout example.
Y-Axis
Access Level Required: VIEW
This key toggles the Y-Axis labels of the graph. Each
key press changes the label to another of the selected
parameters.
X-Axis
Access Level Required: VIEW
This key toggles the X-Axis labels of the graph. Each
key press alternates the scaling between time of day and
elapsed time. The Time of Day scaling is in 24-hour format. The Elapsed Time scaling is the time elapsed since
the START key was pressed, starting the trending.
NAVIGATION
Home
Access Level Required: VIEW
Causes a return to the Home Screen.
History
(Flash memory Card version C.MLM.02.01.xxx and
earlier)
Access Level Required: VIEW
Causes a return to the Home Screen.
Trend Setup
Access Level Required:
Only displayed if the trending is stopped. Causes a jump
to a subscreen for conÞguring the trending display.

OptiView Control Center
FORM 160.55-O1 (604)

TREND SETUP SCREEN

FIG. 38

OVERVIEW
This screen is used to conÞgure the trending screen.
The parameters to be trended are selected from the
Common Slots Screen or Common Slots Master list
and entered as Slot Numbers for Data Points 1 through
6. The Y-Axis minimum and maximum values for each
parameter are entered as Data Point Min and Data Point
Max for Data Points 1 through 6. The interval at which
all the parameters are sampled is selected as the Data
Collection Interval.
DISPLAY ONLY
None
PROGRAMMABLE
Chart Type
Access Level Required: OPERATOR
(Flash Memory Card version (C.MLM.02.02.xxx and
lat er) Selects CONTINUOUS, ONE SCREEN or
TRIGGERED type of graph.

Collection Interval
Access Level Required: OPERATOR
Selects the interval at which the parameters are sampled.
There are 450 data points displayed across the X-Axis
84

00481VIP

of the graph. Each point represents the instantaneous
value of the parameter. The user selects the time interval between these points. This is called the DATA
COLLECTION INTERVAL or the interval at which the
parameter is sampled. This interval is programmable
over the range of 1 second to 3600 seconds (1 hour), in
one second increments. The selected interval not only
determines the sample interval, but also the full screen
time display. The full screen time display is a result of the
selected interval in seconds, multiplied by the 450 data
points. For example, if the Data Collection Interval is
programmed for 900 seconds, the parameter would be
sampled every 900 seconds, with the last 112.5 hours
(4.7 days) of data viewable on the screen. Therefore, the
selected interval is a compromise between resolution
and full screen time display. Select the desired Data
Collection Interval as follows:
1. Determine the desired time interval (in seconds),
between data samples.
2. Calculate the full screen time display as follows:
450 x Data Collection Interval = full screen seconds
full screen seconds / 60 = full screen minutes
full screen minutes / 60 = full screen hours
full screen hours / 24 = full screen days
3. Decide if the resultant sample interval and full screen
display meet the requirements. If not, select a different sample interval.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Select
Access Level Required: OPERATOR
This key is used to enter the slot numbers and the minimum and maximum Y-Axis values of each parameter
to be trended. Pressing this key places a yellow box
around Data Point 1 Slot Number. Use the ▲ and ▼
navigation keys to place the box around the value of
Data Points 1 through 6 to be changed. With the desired
value selected, press the ✓ key. A dialog box is displayed
permitting data entry.
Data Point Slot # (1-6)
Access Level Required: OPERATOR
Use the SELECT key as described above and enter the
slot number from the Common Slots Screen or Master
Slot Number List of the desired parameter to be trended.
The selected parameter description will be displayed
for the Data Point. Setting this slot number to zero will
disable trending for that particular Data Point. Any or
all points can be disabled.
Data Point Min (1-6)
Access Level Required: OPERATOR
Only displayed if the Associated Slot Number is not
Zero. This is the minimum value displayed for the YAxis. Selecting a parameter for a Data Point sets this
to the default value, which is the lowest value allowed
for that parameter. It can be changed to a value that
provides a more appropriate resolution for the parameter
being monitored. To change, use the SELECT key as
described above and enter the desired value. The value
must always be set to a value less than the Data Point
Max. Otherwise, a red graph is displayed on the Trend
Screen with the words “TREND MAX MUST BE >
TREND MIN”. If the parameter selected for this data
point is a digital type (on/off), this value must be set to
zero (0). Zero indicates the OFF state.
Data Point Max (1-6)
Access Level Required: OPERATOR
Only displayed if the associated slot number is not zero.
This is the maximum value displayed for the Y-Axis.

YORK INTERNATIONAL

Selecting a parameter for a Data Point sets this to the
default value, which is the highest value allowed for
that parameter. It can be changed to a value that provides a more appropriate resolution for the parameter
being monitored. To change, use the SELECT key as
described above and enter the desired value. The value
must always be set to a value greater than the Data Point
Min. Otherwise, a red graph is displayed on the Trend
Screen with the words “TREND MAX MUST BE >
TREND MIN”. There are 20 Y-Axis divisions. If a MINMAX span is selected that is not evenly divided by 20,
the Program will automatically select the next higher
MAX value that makes the span evenly divided by 20.
For example, if 0.0 is selected as the MIN and 69.0 is
selected as the MAX, the Program will insert 70.0 as
the MAX value. If the parameter selected for this data
point is a digital type (on/off), this value must be set to
one (1). One indicates the on state.
NAVIGATION
Home
Causes a return to the Home Screen.
Trending
Causes a return to the Trending Screen.
Slot Numbers
Causes a jump to a subscreen that lists the slot numbers of
the most commonly monitored parameters. The desired
parameters to be plotted are selected from this screen.
Triggers
(Flash Memory Card version C.MLM.02.02.xxx
and later)
Causes a jump to the Advanced Trend Setup Screen,
where the start/stop Triggers can be setup. Only displayed if TRIGGERED has been selected as Chart
Type.

OptiView Control Center
FORM 160.55-O1 (604)

ADVANCED TREND SETUP SCREEN

FIG. 39

OVERVIEW
(Flash Memory Card version C.MLM.02.02.xxx
and later)
The desired data collection start/stop triggers are setup
on this screen. The trend data collection can be set to start
or stop based upon the status of up to two selected Triggers. The Triggers can consist of digital events or analog
parameters compared to thresholds. The Triggers can
be used individually or in combination. The digital and
analog parameters are selected from the Common Slots
Screen (or Master Slot Numbers List in this book).
The parameter selected as the Primary Trigger is compared to a value selected as the Primary Test, using the
Primary Operator as a comparator. If it is evaluated as
true, then the data collection is started or stopped (after
any selected Trigger delay) per the selected Trigger
Action.
A Secondary Trigger can be evaluated with the Primary
Trigger to start/stop data collection. The Primary to Secondary Operator is used to deÞne the Trigger combinations required to be true to start/stop data collection. The
Secondary Trigger is setup and evaluated the same as
the Primary Trigger.

00484VIP

Entry Þelds are as follows:
If Primary Trigger
Is Primary Operator
Primary Test
Primary to Secondary Operator
Secondary Trigger
Is Secondary Operator Secondary Test
Then Trigger Action the Data Collection
With a delay of Trigger Delay
After the desired Triggers are set, the START key on
the TREND Screen must be manually pressed before
the triggers will be evaluated. While waiting for the
triggers to start or stop data collection, a status message
is displayed in the upper right corner of the TREND
Screen describing the pending action.
DISPLAY ONLY
None

YORK INTERNATIONAL

FORM 160.55-O1 (604)

PROGRAMMABLE
Primary Trigger
Access Level Required: OPERATOR
Selects the Þrst parameter to be evaluated. Selection is
made from the Slot Numbers listing on the Trend Common Slots Screen or the Master Slot Numbers List in
this book. Setting this slot number to zero disables the
Primary Trigger.
Primary Operator
Access Level Required: OPERATOR
Selects the comparator for the Primary Trigger’s relationship to the Primary Test. If the Primary Trigger is
an analog value, selections are: <, <=, =, =>, >. If the
Primary Trigger is a digital event, selections are: Equal
To, Not Equal To.
Primary Test
Access Level Required: OPERATOR
Selects the value or condition that the Primary Trigger
is compared to. Selection ranges from the Primary Trigger minimum value to the Primary Trigger maximum
value.
Trigger Action
Access Level Required: OPERATOR
Selects whether the trend data collection will Start or
Stop when the Trigger comparisons are true. If set to
Start, data collection will stop after one screen of data
is collected.
Trigger Delay
Access Level Required: OPERATOR
Allows the data collection start or stop to be delayed
after the Triggers evaluate as true. The delay is selectable from 1 to 864000 seconds (10 days). Display
is in days, hours, minutes and seconds. The delay timer
begins when the triggers evaluate as true. If the Trigger
Action is set to Start, data collection will begin after the
triggers evaluate as true and the delay timer has elapsed.
If the Trigger Action is set to Stop, data collection will
stop after the Triggers evaluate as true and the delay
timer has elapsed.

Primary to Secondary Operator
Access Level Required: OPERATOR
Selects whether the Primary Trigger, Secondary Trigger or both have to be true in order to start or stop data
collection. Selections are AND, OR, XOR and None. If
NONE is selected, the Secondary Trigger is disabled.
Data collection will start/stop (as selected with Trigger
Action) when:
• If AND selected: Both Primary AND Secondary are
true
• If OR selected: Either Primary OR Secondary (or
both) are true
• If XOR selected: Either Primary OR Secondary (but
not both) are true
Secondary Trigger
Access Level Required: OPERATOR
Selects the second parameter to be evaluated. Selection
is made from the Slot Numbers listing on the Trend
Common Slots Screen or the Master Slot Numbers List
in this book. Setting this slot number to zero disables
the Secondary Trigger.
Secondary Operator
Access Level required: OPERATOR
Selects the comparator for the Secondary Trigger’s relationship to the Secondary Test. If the Secondary trigger
is an Analog value, selections are: <, <=, =, =>, >. If
the Secondary Trigger is a digital event, selections are:
Equal To, Not Equal To.
Secondary Test
Access Level Required: OPERATOR
Selects the value or condition that the Secondary Trigger
is compared to. Selection ranges from the Secondary Trigger minimum to the Secondary Trigger maximum.
NAVIGATION
HOME
Causes an instant return to the Home Screen.
TREND SETUP
Causes an instant return to the Trend Setup Screen.

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

COMMON SLOTS SCREEN

FIG. 40

00374VIP

OVERVIEW

PROGRAMMABLE

This screen displays the slot numbers of the commonly monitored parameters. The slot numbers for the
remainder of the available parameters are listed on the
Master Slot Numbers List that follows.

Page Down
Access Level required: OPERATOR
Scroll down in the displayed data.

From these lists, select up to six parameters to be trended.
Return to the Trend Setup Screen and enter the parameters
Slot Numbers into Data Points 1 through 6.

Requires a login access level of
OPERATOR or higher.

Page Up
Access Level Required: OPERATOR
Scroll up in the displayed data.
Print
Access Level Required: OPERATOR
Generates a list of the slot numbers of the available
parameters.
NAVIGATION

DISPLAY ONLY

Home
Causes an instant return to the Home Screen.

Slot Numbers
These are the slot numbers of the most commonly used
parameters.

Trend Setup
Causes a return to the Trend Setup Screen.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

CUSTOM VIEW SCREEN

FIG. 41

OVERVIEW
(Flash memory Card version C.MLM.02.01 or later)
This screen allows up to 10 Service Technician selected
parameters to be displayed. These parameters are selected from a list on the Custom View Setup Screen.
This allows the Service Technician to display parameters
pertinent to a particular problem during troubleshooting.
At completion of the service call, the display can be
cleared or the parameters can be left there for monitoring by operations personnel.
DISPLAY ONLY
None
PROGRAMMABLE
Print
Access Level Required: VIEW

YORK INTERNATIONAL

00375VIP

This generates a listing of the parameters displayed on
this screen.
NAVIGATION
Home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
History
Access Level required: VIEW
Causes an instant return to the History Screen.
Setup
Access Level required: SERVICE
Causes a jump to the sub-screen that allows selection of
the parameters to be displayed.

OptiView Control Center
FORM 160.55-O1 (604)

CUSTOM VIEW SETUP

FIG. 42

OVERVIEW
(Flash memory Card version C.MLM.02.01 or later)
This screen allows the Service technician to select up to
10 parameters for display on the Custom View Screen.

Requires a login access level of SERVICE. Service Technicians refer to
YORK Ser vice Manual 160.55-M1
for operation instructions and explanation of all programmable setpoints
and displayed values.
DISPLAY ONLY
Slot Numbers
Lists the available parameters that can be displayed.
The desired parameters for display are selected from
this list.
PROGRAMMABLE
Page Up
Scroll up through list of available parameters.
Page Down
Scroll down through list of available parameters.
Select
First use the Page Up and Page Down keys to scroll
90

00376VIP

through the Slot Numbers list and note the number of
the parameter(s) to be displayed. Pressing the Select key
places a green colored selection box around Custom Slot
1. If it is desired to change an already entered parameter,
use the 5 and 6 keys to place the selection box around
the slot number to be changed. With the selection box
around the slot number to be changed or entered, press
the ENTER (!) key. A dialog box is displayed permitting data entry. Using the numeric keypad keys, enter the
desired slot number and press the ENTER (!) key.
Custom Slot (1-10)
Use the Select key and numeric keypad keys as described
above and enter the slot number from Slot Numbers
list. Setting the Slot number to zero clears the display
of this slot number.
Clear Display
Pressing this key clears all selected parameters from the
Custom View screen.
NAVIGATION
Home
Access Level Required: VIEW
Causes a return to the Home Screen.
Custom View
Access Level Required: SERVICE
Causes a return to the Custom View Screen.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

MASTER SLOT NUMBERS LIST FOR USE WITH TREND FEATURE
SLOT
NO.

DESCRIPTION

256
257

System: Chiller State
System: Coastdown Time Remaining

258

System: Prelube Time Remaining

259

System: Are Safety Shutdown Contacts Closed

260

System: Are Cycling Shutdown Contacts Closed

261

System: Are Anticipatory Alarm Contacts Closed

262
264
265
266
267

System: Operating Hours
System: Number of Starts
System: Is Stop Switch Closed
System: Is Start Switch Closed
System: Is Remote Ready to Start

280
281
282
283
284

External Contact: Is Remote Stop Closed
External Contact: Is Remote Start Closed
External Contact: Is MultiUnit Cycling Closed
External Contact: Is Remote Cycling Closed
External Contact: Is Auxiliary Safety Open

285
286
287
288
289
290
291
292
293
294

Jumper: Is Anti-Recycle Enabled
Jumper: Coastdown Operation
Jumper: Is Diagnostics Enabled
Jumper: Liquid Type
Jumper: Chilled Liquid Pump Operation
Jumper: Motor Type
Jumper: Power Failure Restart
Jumper: Pre-Run Operation
Jumper: Refrigerant Selection
Jumper: VSD Motor Supply Line Frequency

304
305
307

SLOT
NO. DESCRIPTION
1792
1793
1794
1795

Leaving Chilled Liquid: Temperature
Leaving Chilled Liquid: Temperature Differential
Leaving Chilled Liquid: Is Flow Switch Closed
Leaving Chilled Liquid: Is Pump On

1796
1797

Leaving Chilled Liquid: Local Temperature Setpoint
Leaving Chilled Liquid: Remote Analog Temperature
Setpoint
Leaving Chilled Liquid: Remote ISN Temperature
Setpoint
Leaving Chilled Liquid: Remote Modem Temperature
Setpoint
Leaving Chilled Liquid: Selected Temperature
Setpoint

1798
1799
1800

1801
1802
1803
1804
1805
1806

Leaving Chilled Liquid: Control Sensitivity
Leaving Chilled Liquid: Remote Temperature
Range
Leaving Chilled Liquid: Restart Temperature Offset
Leaving Chilled Liquid: Restart Temperature
Setpoint
Leaving Chilled Liquid: Shutdown Temperature Offset
Leaving Chilled Liquid: Shutdown Temperature
Setpoint

1807

Return Chilled Liquid: Temperature

Options: Control Mode
Options: System Language
Options: Display Mode

1808
1809
1810
1811
1812
1813
1814

Evaporator: Pressure
Evaporator: Saturation Temperature
Evaporator: Small Temperature Difference
Evaporator: Is Refrigerant Sensor Present
Evaporator: Refrigerant Temperature
Evaporator: Delta P / P
Evaporator: Brine Low Cutout

512

Sched: Is Schedule Enabled

1815

Smart Freeze Protection: Is Control Enabled

1280
1281
1282
1283
1284
1285

Pre-Rotation Vanes: Is Motor Switch Closed
Pre-Rotation Vanes: Position
Pre-Rotation Vanes: Are Vanes Opening
Pre-Rotation Vanes: Are Vanes Closing
Pre-Rotation Vanes: Are Vanes Holding
Pre-Rotation Vanes: Control Mode

1818

Leaving Chilled Liquid: Remote Digital Temperature
Setpoint

2048
2049
2050

Leaving Condenser Liquid: Temperature
Leaving Condenser Liquid: Is Flow Switch Closed
Leaving Condenser Liquid: Is Pump On

1296

Discharge: Temperature

2051

Return Condenser Liquid: Temperature

1536
1537

Oil: Differential Pressure
Oil: Sump Temperature

1538
1539
1540

Oil Pump: Control Mode
Oil Pump: Is Pump On
Oil Pump: Manual Time Left

2052
2053
2054
2057
2058

Condenser: Pressure
Condenser: Saturation Temperature
Condenser: Small Temperature Difference
Condenser: Is High Pressure Switch Closed
Condenser: High Pressure Warning Threshold

YORK INTERNATIONAL

OptiView Control Center
FORM 160.55-O1 (604)

SLOT
NO.

DESCRIPTION

2059

SubCooling: Temperature

2060
2061

Drop Leg Refrigerant: Is Sensor Present
Drop Leg Refrigerant: Temperature

2063

Vent Line Solenoid: Is Solenoid On

2304
2305
2306
2307

Motor: Starter Type
Motor: Is Motor Starter On
Motor: Current %FLA
Motor: Is Motor Controller Switch Open

2308
2309
2310
2312

Motor: Current Limit Local Setpoint
Motor: Current Limit Remote Analog Setpoint
Motor: Current Limit Remote ISN Setpoint
Motor: Current Limit Selected Setpoint

2313
2314
2315
2316
2317

Motor: Pulldown Demand Time Remaining
Motor: Pulldown Demand Limit Setpoint
Motor: Pulldown Demand Time Setpoint
Motor: Anti-Recycle Time Remaining
Motor: Current Limit Remote Digital Setpoint

2560
2561
2562
2563
2564
2565
2566
2567
2568
2569

Mod "A" SSS ONLY
SSS: Phase A Current
SSS: Phase B Current
SSS: Phase C Current
SSS: Phase A Voltage
SSS: Phase B Voltage
SSS: Phase C Voltage
SSS: Scale/Model
SSS: Full Load Amps
SSS: Supply Voltage Range
SSS: Is Current Unbalance Check Enabled

2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587

Mod "B" SSS ONLY
LcSss: Input Power
LcSss: Kilowatt Hours
LcSss: Phase A Current
LcSss: Phase B Current
LcSss: Phase C Current
LcSss: Phase A Voltage
LcSss: Phase B Voltage
LcSss: Phase C Voltage
LcSss: Phase A Temperature
LcSss: Phase B Temperature
LcSss: Phase C Temperature
LcSss: Starter Model
LcSss: Full Load Amps
LcSss: Voltage Range
LcSss: Starting Current
LcSss: Is Serial Communications OK
LcSss: Panel to Sss Comm Errors
LcSss: Sss to Panel Comm Errors

SLOT
NO. DESCRIPTION
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844

VSD: Motor HP
VSD: 100% Full Load Amps
VSD: Input Power
VSD: Kilowatt Hours
VSD: DC Bus Voltage
VSD: DC Inverter Link Current
VSD: Output Frequency
VSD: Output Voltage
VSD: Phase A Current
VSD: Phase B Current
VSD: Phase C Current
VSD: Is Precharge Relay On
VSD: Is Trigger SCR On
VSD: Is Water Pump On
VSD: Control Mode
VSD: Command Frequency
VSD: Manual Frequency Increment
VSD: Internal Ambient Temperature
VSD: Converter Heatsink Temperature
VSD: Phase A Heatsink Temperature
VSD: Phase B Heatsink Temperature
VSD: Phase C Heatsink Temperature
VSD: Is Communications OK
VSD: Panel to ACC Comms Error Count
VSD: ACC to Panel Comms Error Count
VSD: ACC to VSD Comms Error Count
VSD: VSD to ACC Comms Error Count
VSD: VSD to Filter Comms Error Count
VSD: Filter to ACC Comms Error Count

2845
2846
2847
2848
2849
2850
2857
2858
2859
2860

ACC: Delta P/P
ACC: Stability Limit
ACC: Surge Margin
ACC: Manual Surge Command
ACC: Surge Map Count
ACC: Surge Type
ACC: Surge Map Point Count
ACC: Surge Map Delta P/P
ACC: Surge Map Output Frequency
ACC: Surge Map PRV Position

2861
2862
2863
2864
2865
2866
2867
2868
2869
2870

Filter: Is Filter Installed
Filter: Is Operation Inhibited
Filter: Is Filter Running
Filter: Is Precharge Contactor Closed
Filter: Is Supply Contactor Closed
Filter: Phase Rotation
Filter: Motor HP
Filter: Supply KVA
Filter: Total Power Factor
Filter: DC Bus Voltage

YORK INTERNATIONAL

FORM 160.55-O1 (604)

SLOT
NO. DESCRIPTION
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891

Filter: Heatsink Temperature
Filter: L1 - L2 RMS Voltage
Filter: L2 - L3 RMS Voltage
Filter: L3 - L1 RMS Voltage
Filter: L1 - N Peak Voltage
Filter: L2 - N Peak Voltage
Filter: L3 - N Peak Voltage
Filter: L1 Total Harmonic Distortion
Filter: L2 Total Harmonic Distortion
Filter: L3 Total Harmonic Distortion
Filter: L1 RMS Filter Current
Filter: L2 RMS Filter Current
Filter: L3 RMS Filter Current
Filter: L1 RMS Supply Current
Filter: L2 RMS Supply Current
Filter: L3 RMS Supply Current
Filter: L1 Total Demand Distortion
Filter: L2 Total Demand Distortion
Filter: L3 Total Demand Distortion
Filter: Maximum Total Harmonic Distortion
Filter: Maximum Total Demand Distortion

YORK INTERNATIONAL

SLOT
NO. DESCRIPTION
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
12288
12289
12290
12291
12292
12293
12294
12295
12296

Refrigerant Level: Is Control Enabled
Refrigerant Level: Position
Refrigerant Level: Is Valve Closing
Refrigerant Level: Is Valve Opening
Refrigerant Level: Control Mode
Refrigerant Level: Is Pulldown In Effect
Refrigerant Level: Pulldown Time Remaining
Refrigerant Level: Target Setpoint
Refrigerant Level: Setpoint
Refrigerant Level: Period
Refrigerant Level: Proportional Limit Close
Refrigerant Level: Proportional Limit Open
Refrigerant Level: Rate Limit Close
Refrigerant Level: Rate Limit Open

Purge: Pressure
Purge: Is Air Purge Valve Closed
Purge: Is Oil Purge Valve Closed
Purge: Is Bottom Float Switch Closed
Purge: Is Top Float Switch Closed
Purge: Exhaust Count
Purge: Window Time
Purge: Is High Efficiency Enabled
Purge: Maximum Purges Per Hour

OptiView Control Center
FORM 160.55-O1 (604)

DISPLAY MESSAGES
The Status Bar of the Display contains a Status Line
and, beneath it a Details Line. The Status Line contains
a message describing the operating state of the chiller;
whether it is stopped, running, starting or shutting down.
The Details Line displays Warning, Cycling, Safety,
Start Inhibit and other messages that provide further
details of the Status Bar messages. The Status Messages
listed below are displayed on the Status Line. All other
messages are displayed on the Details Line.
To aid in the meaning of the message, messages are
displayed in different colors as follows:
Normal Operation messages - Green
Warning messages - Yellow
Cycling Shutdown messages - Orange
Safety Shutdown messages - Red

STATUS MESSAGES
“SYSTEM READY TO START”
The chiller is shut down but will start upon receipt of a
Local or Remote start signal.
“CYCLING SHUTDOWN – AUTO RESTART”
The chiller is shut down on a CYCLING shutdown. The
cause of the shutdown is still in effect and is displayed
on the Details line of the Status Bar. The chiller will
automatically restart when the CYCLING condition
clears.
“SAFETY SHUTDOWN – MANUAL RESTART”
The chiller is shut down on a SAFETY shutdown. The
cause of the shutdown is still in effect and is displayed
on the Details line of the Status Bar. The chiller can be
started after the Safety condition clears and the Operator
moves the COMPRESSOR switch to the STOP-RESET
(O) position.
“SYSTEM PRELUBE”
A chiller start has been initiated and the pre-start lubrication is being performed. The Prelube duration is
either 30 seconds or 180 seconds, as conÞgured with
a Microboard Program Switch. The Pre-lube duration
must never be changed by anyone other than a qualiÞed Service Technician. The standard Prelube duration
is 30 seconds.
“SYSTEM RUN”
The chiller is running under the condition described in
the Details Line of the Status Bar.
94

“SYSTEM COASTDOWN”
The chiller has shut down and the Post-run lubrication is
being performed. On electric motor drive applications,
the Postlube duration is 150 seconds. On Steam Turbine
applications, it is 15 minutes. The actual duration is determined by a Microboard Program Jumper, conÞgured
by a qualiÞed Service technician.
“START INHIBIT”
The chiller is prevented from being started due to the
reason displayed on the Details Line of the Status bar.

RUN MESSAGES
“MOTOR – HIGH CURRENT LIMIT”
The Compressor Motor current is > the Local or Remote
Current Limit Setpoint. The Current Limit Setpoint is
programmed over a range of 30 to 100% of the Chiller
Full Load Amps (FLA). When the motor current increases to the “inhibit open” threshold, the Pre-rotation
Vanes are inhibited from further opening. This prevents
a further current rise. If the current continues to rise
to the “start close” threshold, the Vanes begin closing
until the current falls to the “stop close” threshold. Automatic Vane operation is resumed and this message
automatically clears when the motor current decreases to
the “allow open” threshold. The thresholds are different
for the various motor starter applications. To allow Þeld
calibration of the Solid State Starter (Mod “A”) Logic
Board or CM-2 Current Module, pressing the Slide Valve
Load key in Service access level, starts a 10 minute timer
during which the current limit thresholds are elevated.
Refer to table on next page.
Vane Control
On rise, inhibit open

Motor Current (%FLA)
Electro-Mechanical/
VSD
Service Mode
Solid state starter
100

100

107
106

On fall, allow open

On rise, start close

104

103

110

On fall, stop close

102

101

109

An example of current limit is as follows: If a Solid Sate
Starter chiller FLA is 100 Amps and the Current Limit
Setpoint is 50%, the following will occur:
50 Amps – inhibit vane open
52 Amps – vanes begin closing
51 Amps – vanes stop closing
49 Amps – allow automatic vane control
“LEAVING CHILLED LIQUID CONTROL”
The chiller is running, controlling the Leaving Chilled
Liquid to the Leaving Chilled Liquid Temperature
Setpoint. There are no system conditions inhibiting
this operation.
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FORM 160.55-O1 (604)

“MOTOR PULLDOWN LIMIT”
The Pulldown Demand Limit Setpoint timer is in effect
and the Compressor Motor current is > the Pulldown
Demand Current Limit Setpoint value. The Pre-rotation
vane operation is being inhibited as described in “ MOTOR – HIGH CURRENT LIMIT” message above.

START INHIBIT MESSAGES
“ANTI-RECYCLE XXMin/Sec”
The chiller is inhibited from starting because the 30
minute anti-recycle time has not yet elapsed. Time remaining is displayed.
“VANE MOTOR SWITCH OPEN”
The chiller is inhibited from starting because the Prerotation Vanes are not fully closed.
“MOTOR CURRENT >15% FLA”
The OptiView Control Center has detected a Compressor Motor Current of a magnitude that is >15% of
the chiller Full Load Amps for 10 continuous seconds,
while the chiller is shutdown. As long as this condition exists, the oil pump is turned on. This is generally
indicative of a failure of the motor starter, Control
Center start circuits or motor current feedback circuits.
After motor current is no longer detected, a SYSTEM
COASTDOWN is performed. The chiller can be started
after motor current is no longer detected, the SYSTEM
COASTDOWN has completed and the COMPRESSOR
switch is placed in the STOP-RESET (O) position.
“LCSSS – HIGH TEMPERATURE PHASE X
– STOPPED”
(Mod. “B” Solid State Starter only)
The chiller is stopped and the Liquid Cooled Solid
State Starter Logic/Trigger Board has detected that the
temperature of phase A, B or C (designated as X in the
message) Silicon Controlled RectiÞer (SCR) module is
>110°F. The starter cooling pump will run and the chiller
will be inhibited from starting until the temperature decreases to <109°F.

WARNING MESSAGES
“WARNING – REAL TIME CLOCK FAILURE”
During the initialization process that occurs when power
is applied to the OptiView Control Center, test data is
written to a location in the BRAM battery backed memory device (IC location U52 on Microboard). This data
is then read from the BRAM and compared to the test
data. If the read data is not the same as that which was

YORK INTERNATIONAL

written to the device, it is assumed the BRAM and Real
time Clock operation is defective and this message is
displayed. The BRAM should be replaced by a qualiÞed
Service Technician. This message automatically clears
when the BRAM problem has been solved.
“WARNING – CONDENSER OR EVAPORATOR
XDCR ERROR”
The Evaporator pressure Transducer is indicating a higher
pressure than the Condenser pressure Transducer after the
chiller has been running for 10 minutes. This is indicative
of a Condenser or Evaporator Transducer failure. This
message will be displayed until the condition clears and
the WARNING RESET Keypad key is pressed on the
home screen in OPERATOR (or higher) access mode.
Condition not checked in Brine mode.
“WARNING – SETPOINT OVERRIDE”
A blank BRAM battery-backed memory device (IC
location U52 on Microboard) or a failure of this device
was detected during the initialization process that occurs when power is applied to the OptiView Control
Center. Due to this failure, any or all of the programmed
Setpoints could have been corrupted. Therefore, all Setpoints have been automatically changed to their Default
values. All Setpoints will have to be programmed to
their desired values. This message will clear when the
WARNING RESET key is pressed on the home screen
in OPERATOR (or higher) access mode.
“WARNING – CONDENSER – HIGH PRESSURE
LIMIT”
The Condenser Pressure exceeds the High Pressure
Warning Setpoint threshold, programmed by a Service
technician logged in at SERVICE access level. While
this condition is in effect, the Pre-rotation Vanes are
inhibited from further opening. This message automatically clears and the Vanes are permitted to open
when the Condenser pressure decreases to 0.1 PSIA
below the Setpoint.
“WARNING – EVAPORATOR – LOW PRESSURE
LIMIT”
The Evaporator pressure has decreased to the Warning
threshold. This threshold is Þxed in Water cooling applications. In Brine cooling applications, the threshold is a
Þxed amount above the programmable safety shutdown
threshold. The Safety threshold in Brine applications is
determined by the Brine solution and is determined by
the YORK Factory. While this condition is in effect,
the Pre-rotation Vanes are inhibited from further open95

OptiView Control Center
FORM 160.55-O1 (604)

ing. This message automatically clears and the Vanes
are permitted to open when the Evaporator pressure
increases to the reset value.
Warning Threshold (PSIA)
Water

Brine

Reset Threshold (PSIA)
Water

Brine

R11

5.5

0.1 >Safety Setpoint

5.6

0.3>Safety Setpoint

R123

4.5

0.1 >Safety Setpoint

4.7

0.3>Safety Setpoint

“WARNING – VANES UNCALIBRATED – FIXED
SPEED”
The Compressor Motor Variable Speed Drive (VSD) is
operating Fixed Speed (full speed) mode because the
Pre-rotation Vanes position potentiometer calibration
has not been performed. Message automatically clears
when calibration has been performed.
“WARNING – HARMONIC FILTER –
OPERATION INHIBITED”
The compressor Motor variable Speed Drive (VSD) Harmonic Filter has been inhibited. Refer to VSD Service
manual 160.00-M1. Harmonic Þlter operation should not be
altered by anyone other than a qualiÞed Service technician.
Message automatically clears when Þlter is enabled.
“WARNING – HARMONIC FILTER –
DATA LOSS”
Communications between the Harmonic Filter Logic Board
and the Compressor Motor Variable Speed Drive (VSD)
Logic Board or the Adaptive Capacity Control Board is not
occurring. While this condition exists, all Filter related parameters are displayed as X’s. This message automatically
clears when communications are restored.
“WARNING – HARMONIC FILTER –
INPUT FREQUENCY RANGE”
The power line frequency detected by the Compressor
motor Variable Speed Drive (VSD) Harmonic Filter is
outside the range of 58 to 62 Hz (60 Hz) or 49 to 51 Hz
(50 Hz). While this condition exists, all Filter related parameters are displayed as X’s. This message automatically
clears when the line frequency is within range.
“WARNING – PURGE – HIGH PRESSURE”
With the chiller running, the purge pressure increased to
>55.0 PSIA (standard purge units) or > 95.0 PSIA (high
efÞciency purge units) continuously for 4 minutes. This
message will be displayed until the purge pressure decreases
to the reset threshold of < 55.0 PSIA (standard purge units),
< 95.0 PSIA (high efÞciency purge units) or the chiller is
not running and the WARNING RESET key is pressed on
the HOME Screen is OPERATOR (or higher) access mode.
This warning will not be displayed if the Purge Float Switch
Error warning (below) is in effect.
96

“WARNING – PURGE – FLOAT SWITCH ERROR”
With the chiller running, the Purge Float Switches were
in invalid states. Typically this is caused by the Bottom
Float Switch being in the closed position and the Top
Float Switch in the open position, indicating the oil level
is simultaneously below the bottom switch and above
the top switch, an impossible condition. This message
will be displayed until the ßoat switches are indicating
valid positions (or the chiller is not running) and the
WARNING RESET key is pressed on the HOME
Screen in OPERATOR (or higher) access mode. While
this message is displayed, the Purge Oil Solenoid Valve
is de-energized, draining the Purge Tank.
“WARNING – EXCESS PURGE”
The purge EXHAUST COUNT has equaled the programmed MAXIMUM PURGES PER HOUR setpoint.
While this message is displayed, purging continues but
the EXHAUST COUNT is not incremented. Clearing
this message resets the exhaust count and exhaust window. If the chiller is running, the exhaust window will
then increment from 0 to 60 minutes and the exhaust
count will increment as exhausts occur. This message
will be displayed until the WARNING RESET key is
pressed on the HOME Screen in OPERATOR (or higher)
access mode.
“WARNING – PURGE – CANISTER #1 FULL”
(Flash Memory Card version C.MLM.02.02.xxx
and later)
The Purge Canister Alarm on the Lower Emissions Purge
Canister #1 indicates the canister has captured its capacity
of refrigerant. The canister must be replaced following
instructions on label inside Purge Panel door. This message is triggered when the Purge Canister Alarm output
increases to > 2.20VDC. This message will be displayed
until the Alarm signal is < 0.90VDC and the WARNING
RESET key is pressed on the HOME Screen in OPERATOR (or higher) access mode.
“WARNING – VANES UNCALIBRATED”
The Hot Gas Bypass feature is enabled, but the Pre-rotation Vanes calibration procedure has not yet been performed. Message automatically clears when calibration
has been performed.
“WARNING – EXTERNAL I/O – SERIAL COMMUNICATIONS”
Serial communications between the Microboard and the
optional Analog I/O Board has been interrupted for at
least 20 seconds. Message automatically clears when
communications are restored.

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FORM 160.55-O1 (604)

“WARNING – REFRIGERANT LEVEL OUT OF
RANGE”
(Flash Memory Card version C.MLM.02.02C.xxx
and earlier)
The output of the Condenser Refrigerant Level Sensor is
> 5.1VDC. This is indicative of a Level Sensor failure.
While this condition exists, the Refrigerant Variable OriÞce is driven to the full open position. This message
automatically clears when the Refrigerant Level sensor
output is within range.
“WARNING - EXCESS SURGE DETECTED”
(Flash Memory Card version C.MLM.02.02.xxx
and later)
(Applies only if Surge Protection SHUTDOWN feature
is Disabled.) The Surge Window Count has exceeded
the Count Limit. Message can be manually cleared
after the Surge Window Count is < the Count Limit,
the SHUTDOWN feature is Enabled or the chiller is
stopped. To clear message press WARNING RESET
key on HOME Screen when logged in at OPERATOR
(or higher) access level.
“WARNING – SURGE PROTECTION – EXCESS
SURGE LIMIT”
(Flash Memory Card version C.MLM.02.02.xxx
and later)
(Applies only if Surge Protection EXTENDED RUN
feature is Enabled.) Displayed during the Surge Protection 10 minute Extended Run period. This period begins
when the Surge Window Count exceeds the Count Limit.
During this period, the Pre-rotation Vanes are driven
closed. When 10 minutes have elapsed, this message
and the Pre-rotation Vanes load inhibit are automatically
cleared. Message and load inhibit are also cleared when
the chiller is shutdown.

If the optional Hot Gas Bypass feature
is enabled, the valve position must be
at 100% before the Extended Run is
implemented. If the chiller is chiller is
equipped with a compressor motor Variable Speed Drive, the output frequency
must be at full speed (50 Hz/60 Hz) before this control can be implemented.
ROUTINE SHUTDOWN MESSAGES
“REMOTE STOP”
A shutdown command has been received from a remote device. Remote Stop commands can be received
in Digital Remote mode via I/O Board TB4-7/8 or in
YORK INTERNATIONAL

ISN (Integrated Systems Network) Remote mode via
the MicroGateway serial communications.
“LOCAL STOP”
A local shutdown command has been received by placing the Keypad Start-Run-Stop/Reset Switch in the stop
(O) position.
“PLACE COMPRESSOR SWITCH IN RUN POSITION”
The OptiView Control Center is in either Digital or ISN
(Integrated Systems Network) Remote mode. The Operator is requested to place the COMPRESSOR Switch
in the RUN position. The OptiView Control Center
will not accept a Remote start/stop command unless
the switch is in the RUN position.

CYCLING SHUTDOWN MESSAGES
“MULTIUNIT CYCLING – CONTACTS OPEN”
The Multiunit Cycling contacts connected to I/O Board
TB4-9, have opened to initiate a cycling shutdown. The
chiller will automatically restart when the contacts close.
“SYSTEM CYCLING – CONTACTS OPEN”
The System Cycling contacts connected to I/O Board
TB4-13, have opened to initiate a cycling shutdown.
The chiller will automatically restart when the contacts
close.
“OIL – LOW TEMPERATURE”
The oil temperature has decreased to < 55°F. The chiller
will automatically restart when the temperature increases
to > 71.0°F.
“CONTROL PANEL – POWER FAILURE”
A Control Power failure has occurred. If the power
failure occurred while the chiller was running, it will
automatically restart when power is restored. However,
if the power failure duration was < the duration of the
applicable “Coastdown” period (2.5 minutes standard;
15 minutes steam turbine) when power is restored, the
remainder of the “Coastdown” will be performed, prior
to the chiller starting. This message can indicate a Cycling (auto-restart after power failure) or Safety (manual
restart after power failure) shutdown, depending upon
OptiView Control Center conÞguration. It indicates a
cycling shutdown when displayed in orange characters;
Safety shutdown when displayed in red characters. The
OptiView Control Center is conÞgured for auto-restart
or manual restart after power failure by a qualiÞed Service Technician following instructions in YORK Service
Manual 160.55-M1.
97

OptiView Control Center
FORM 160.55-O1 (604)

“LEAVING CHILLED LIQUID – LOW
TEMPERATURE”
The Leaving Chilled Liquid Temperature has decreased
to the programmed Shutdown Temperature Setpoint. The
chiller will automatically restart when the temperature
increases to the programmed Restart Temperature
Setpoint.
“LEAVING CHILLED LIQUID –
FLOW SWITCH OPEN”
The Chilled Liquid Flow Switch has remained open for
2 continuous seconds while the chiller was running or
failed to close during the System Pre-lube period. The
chiller will automatically restart when the ßow switch
closes.
“CONDENSER – FLOW SWITCH OPEN”
The Condenser water ßow switch has remained open for
2 continuous seconds while the chiller was running. This
check is bypassed for the Þrst 30 seconds of “System
Run”. The chiller will automatically restart when the
ßow switch closes.
“MOTOR CONTROLLER –
CONTACTS OPEN”
The CM-2 Current module (Electromechanical starter
applications) or Solid State Starter Logic Board (Mod
“A” Solid State Starter applications) has shutdown the
chiller. When detecting a fault condition that places the
starter or motor at risk, these devices open the Motor
Controller contacts “CM” (located on the respective device and connected between TB6-16 and TB6-53 in the
OptiView Control Center) to initiate a shutdown. Since
there are several different faults that are monitored,
LED’s on the respective device illuminate to identify
the speciÞc fault that has occurred. Refer to YORK
Manual 160.46-OM3.1 for details of Mod “A” Solid
State Starter initiated shutdowns and 160.55-M1 for
CM-2 initiated shutdowns. The chiller will automatically
restart when the Motor Controller contacts close. On
some shutdowns, the respective device automatically
closes the contacts when the fault condition clears. Other
shutdowns require the Operator to perform a Manual
Reset at the respective device.
Device

Manual Reset Fault

Automatic Reset Fault

CM-2 Module

Overload

None

Overload
High Temp(>212°F)

Solid State Starter

Fault Current

“MOTOR CONTROLLER – LOSS OF
CURRENT”
The Compressor Motor current decreased to 10% Full
Load Amps (FLA) for 25 continuous seconds while the
chiller was running. This could be caused by the starter
de-energizing during run or a defect in the motor current feedback circuitry to the OptiView Control Center.
The chiller will automatically restart at the completion
of “System Coastdown”.
“POWER FAULT”
The CM-2 Current Module (Electro-mechanical starter
applications) or Solid State Starter Logic Board (Mod
“A”) (Solid State Starter applications) has shutdown the
chiller because it detected a fault condition that places
the motor at risk. These devices open and close the Motor controller “CM” contacts (located on the respective
device and connected between TB6-16 and TB6-53 in
the OptiView Control Center) in < 3 seconds to initiate
the shutdown and produce this message. An LED on
the respective device illuminates to identify the speciÞc fault that has occurred. Refer to YORK Manual
160.46-OM3.1 for details of Mod “A” Solid State Starter
initiated shutdowns and 160.55-M1 for CM-2 initiated
shutdowns. The chiller will automatically restart when
the contacts close.
Device
CM-2 Module
Solid State Starter

Shutdown
Power fault
Power Fault
Half Phase

“CONTROL PANEL – SCHEDULE”
The programmed Daily Schedule Setpoint has shut down
the chiller. The chiller will automatically restart at the
next scheduled start time.
“STARTER – LOW SUPPLY LINE VOLTAGE”
(Mod “A” Solid State Starter”)
The voltage in any phase of the AC Power Line Voltage
supplying the Solid State Starter has decreased to the low
line voltage threshold for 20 continuous seconds. The
chiller will automatically restart when the voltage returns
to the restart level. The thresholds are as follows:
Shutdown (Volts)

Restart (Volts)

380

305

331

Phase Rotation/Loss

400

320

349

High Temp start inhibit (>110°F)

415

335

362

440-480

370

400

550-600

460

502

Supply Voltage Range disabled

none

N/A

Trigger Board Out-of-Lock

Supply Voltage Range (Volts)

YORK INTERNATIONAL

FORM 160.55-O1 (604)

“STARTER – HIGH SUPPLY LINE VOLTAGE”
(Mod “A” Solid State Starter”)
The voltage in any phase of the AC Power Line Voltage
supplying the Solid State Starter has increased to the
high line voltage threshold for 20 continuous seconds.
The chiller will automatically restart when the voltage
returns to the restart level. The thresholds are as follows:
Shutdown (Volts)

Restart (Volts)

380

Supply Voltage Range (Volts)

415

414

400

436

435

415

454

453

440-480

524

523

550-600

655

654

Supply Voltage Range disabled

none

N/A

MOD “B” SOLID STATE STARTER
CYCLING SHUTDOWN MESSAGES
“LCSSS – INITIALIZATION FAILED”
When AC Power is restored to the system after a power
failure, an initialization process occurs wherein the
OptiView Control Center attempts to establish communications through the serial communications link with
the Liquid Cooled Solid State Starter. If communications
are not established within 10 consecutive attempts, a
Cycling shutdown is performed and this message is
displayed. The Control Center attempts to establish
communications until successful.
“LCSSS – SERIAL COMMUNICATIONS”
After communications have been successfully established in the INITIALIZATION process, the OptiView
Control Center initiates a data transmission to the Liquid
Cooled Solid State Starter on the serial communications
link every 2 seconds. After these communications have
been established, if the Control Center does not receive
a reply within 10 consecutive attempts, a Cycling shutdown is performed and this message is displayed. This
same Cycling shutdown is performed, along with the
same message, if the Liquid Cooled Solid State Starter
does not receive a response from the control center
after 10 consecutive attempts to communicate with the
Control Center after INITIALIZATION has been successfully completed. The Control Center attempts to
establish communications until successful.
“LCSSS SHUTDOWN – REQUESTING FAULT
DATA . . .”
The Liquid Cooled State Starter Logic/Trigger Board
has shut down the chiller but the OptiView Control
Center has not yet received the cause of the fault from
YORK INTERNATIONAL

the LCSSS, via the serial communications link. The
LCSSS shuts down the chiller by opening the Motor
Controller LCSSS Stop Contacts (K1 relay located on
the starter Logic/Trigger Board and connected between
TB6-16 and TB6-53 in the OptiView Control Center).
The Microboard, in the Control Center then sends a
request for the cause of the fault to the Logic/Trigger
Board over the serial communications link. Since serial
communications are initiated every 2 seconds, this message is typically displayed for a few seconds and then
replaced with one of the below listed fault messages.
“LCSSS – STOP CONTACTS OPEN”
Refer to “LCSSS SHUTDOWN – REQUESTING
FAULT DATA ...” above. If the OptiView Control
Center’s Microboard does not receive the cause of
a starter initiated shutdown with 20 seconds of the
shutdown, it is assumed it is not forthcoming and that
message is replaced with this message. The chiller can
be started when the Motor Controller LCSSS Stop
Contacts close.
A missing interlock jumper between Starter Logic/Trigger
Board J1-1 and J1-12 will also produce this message.
“LCSSS – POWER FAULT”
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the compressor motor current in
one or more phases has decreased to <10% of the FLA
for a minimum of 1 line cycle. This check is inhibited
during the Þrst 4 seconds of SYSTEM RUN and until
the motor current is >25% of the FLA. The chiller will
automatically restart upon completion of SYSTEM
COASTDOWN.
“LCSSS – LOW PHASE X TEMPERATURE SENSOR”
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the temperature of the starter
phase A, B or C (designated as X in the message) Silicon
Controlled RectiÞer (SCR) Module has decreased to
<37°F. This would generally be indicative of a disconnected or defective sensor. If all three SCR Modules
are indicating a temperature of <37°F, the SCR Module
cooling pump turns on. This is accomplished by disconnecting all three sensors. This feature allows Service
Technicians to run the cooling pump while Þlling the
cooling system by disconnecting plugs P2, P3 and P4
in the LCSSS.
“LCSSS – RUN SIGNAL”
The Liquid Cooled Solid State Starter receives two
start signals from the OptiView Control Center simul99

OptiView Control Center
FORM 160.55-O1 (604)

taneously; one via the serial communications link and
one via the start relay TB6-24 in the OptiView Control
Center. If they are not received within 5 seconds of
one another, a cycling shutdown is performed and this
message is displayed. This is generally indicative of
defective wiring.
“LCSSS – INVALID CURRENT SCALE
SELECTION”
There is an invalid compressor motor current scale
jumper combination installed in the Liquid Cooled
Solid Starter Logic/Trigger Board J1. Jumper combination determines allowable “100% FLA” setpoint range;
7L-35 to 260A, 14L-65 to 510A, 26L-125 to 850A and
33L-215 to 1050A. The chiller will be permitted to
start when the jumpers are conÞgured correctly. Refer
to YORK Starter service manual 160.00-O2 for valid
jumper conÞgurations.
“LCSSS – PHASE LOCKED LOOP”
The Liquid Cooled Solid State Starter Logic/Trigger
Board phase locked loop circuit was not able to maintain lock with phase A of the power line. This could be
caused by a power line anomaly such as sag or jitter. A
power line frequency jitter of up to 3 Hz/second can be
tolerated. The chiller will automatically restart when
lock has resumed.
“LCSSS – LOW SUPPLY LINE VOLTAGE”
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the compressor motor AC
power line voltage, in any phase, decreased below the
low line voltage threshold continuously for 20 seconds.
The chiller will automatically restart when the voltage
in all phases returns to the restart level. The thresholds
are as follows:
Supply Voltage Range (Volts)

Shutdown(Volts)

Restart(Volts)

Disabled

None

N/A

200-208

160

174

220-240

185

200

380

305

331

400

320

349

415

335

362

440-480

370

400

550-600

460

502

“LCSSS – HIGH SUPPLY LINE VOLTAGE”
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the compressor motor AC power
line voltage, in any phase, exceeded the high line voltage
threshold continuously for 20 seconds. The chiller will
automatically restart when the voltage in all phases returns
to the restart level. The thresholds are as follows:
100

Supply Voltage Range (Volts)

Shutdown(Volts)

Restart(Volts)

Disabled

None

N/A

200-208

227

226

220-240

262

261

380

415

414

400

436

435

415

454

453

440-480

524

523

550-600

655

654

“LCSSS – LOGIC BOARD PROCESSOR”
Communication between the V25 Microprocessor and
Digital Signal Processor (DSP) on the Liquid Cooled
Solid State Starter Logic/Trigger Board has been interrupted. The chiller will automatically restart when
communications are restored.
“LCSSS - PHASE LOSS”
(Flash Memory Card version C.MLM.02.01 or
later)
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected the line-to-line RMS voltage in any
phase has decreased to < 30% of the lowest value of the
programed voltage range. If the programmed voltage
range is “Disabled”, a value of 60VAC is used as the
threshold. The chiller will automatically restart when the
line voltage is > the shutdown threshold. The voltage
range is programmed by a Service technician following
instructions in Service Manual 160.55-M1.
“LCSSS – PHASE ROTATION/LOSS”
(Flash Memory Card version C.MLM.02.00 only)
The Liquid cooled Solid State Starter Logic/Trigger
Board has detected that the three-phase compressor
motor power line voltage phase rotation is not correct
or the line-to-line voltage in any phase has decreased to
<30% of nominal. The chiller will automatically restart
when the power line conditions are acceptable.
“LCSSS – LOGIC BOARD POWER SUPPLY”
Following application of power, this message is displayed and a snapshot of the LCSSS parameters and
time of power failure are sent to the OptiView Control
Center.

COMPRESSOR MOTOR VARIABLE
SPEED DRIVE:
CYCLING SHUTDOWN MESSAGES
The following Cycling shutdown messages are displayed
on Compressor Motor Variable Speed Drive (VSD) applications only. These messages are generated by events
that occur within the VSD. The chiller will automatically
YORK INTERNATIONAL

FORM 160.55-O1 (604)

restart when the cycling condition clears. Service and
troubleshooting information is contained in YORK
Manual 160.00-M1.
“VSD SHUTDOWN – REQUESTING
FAULT DATA”
The VSD has shut down the chiller and the OptiView
Control Center has not yet received the cause of the
fault from the VSD, via the serial communications link.
The VSD shuts down the chiller by opening the Motor
Controller VSD Stop Contacts (located on the VSD
Logic Board and connected between TB6-16 and TB653 in the OptiView Control Center). The Microboard
in the OptiView Control Center then sends a request
for the cause of the fault to the VSD Logic Board via
the Adaptive Capacity Control Board, over the serial
link. Since serial communications are initiated every 2
seconds, this message is typically displayed for a few
seconds and then replaced with one of the below listed
fault messages.
“VSD – STOP CONTACTS OPEN”
Refer to “VSD Shutdown – Requesting Fault Data”
message above. If the OptiView Control Center’s
Microboard does not receive the cause of the Fault
over the Serial Link within 20 seconds, it is assumed it
is not forthcoming and that message is replaced with VSD
– STOP CONTACTS OPEN message.
“VSD INITIALIZATION FAILED”
Upon application of power, all boards go through the
initialization process. At this time, memory locations are
cleared, program jumper positions are checked and serial
communications links are established. There are several
causes for an unsuccessful initialization as follows:
• The OptiView Control Center and the VSD must be
energized at the same time. The practice of pulling
the fuse in the Control Center to remove power from
the Control Center will create a problem. Powerup must be accomplished by closing the main disconnect on the VSD cabinet with all fuses in place.
A power interruption to the VSD Logic board will
also generate this message.
• The EPROMS must be of the correct version for
each VSD board and they must be installed correctly.
The EPROMS are created as a set and cannot be
interchanged between earlier and later versions.
• Serial data communications must be established.
Refer to VSD - Serial Communications fault. If
communications between the VSD Logic Board,
Harmonic Filter Logic Board, ACC Board and Control Center Microboard does not take place during
YORK INTERNATIONAL

initialization, this message will be generated. The
Serial communications can be veriÞed by selecting
the VSD DETAILS screen from the MOTOR screen
and observing the Full Load amps value. A zero displayed for this and other VSD parameters, indicates
a serial communications link problem.
• If the Harmonic Filter option is included, make sure
the Filter Logic Board is not in continuous reset.
This condition is evidenced by the Filter Logic
Board’s LED’s alternately blinking. The Þlter can
be eliminated as a cause of initialization failure by
disconnecting the Filter by placing switch SW1 on
the Filter Logic Board in the OFF position and removing the ribbon cable between the Filter Logic
Board and the VSD Logic Boards.
• VSD and Harmonic Filter Horsepower ratings do
not agree.
“VSD – HIGH PHASE A
INSTANTANEOUS CURRENT”
This shutdown is generated by the VSD if the motor
current in phase “A” exceeds a given limit. The motor current is sensed by the current transformers on the
VSD output pole assemblies and the signals are sent to
the VSD Logic Board for processing. Maximum instantaneous permissible currents are:
351/292 HP
503/419 HP
790/658 HP

=
=
=

771 Amps
1200 Amps
1890 Amps

If an overcurrent trip occurs, but the chiller restarts and
runs without a problem, the cause may be attributed to a
voltage sag on the utility power feeding the VSD that is
in excess of the speciÞed voltage range for this product.
Thus is especially true if the chiller was running at or
near full load. If there should be a sudden dip in line
voltage, the current to the motor will increase, since the
motor wants to draw constant horsepower. The chiller
Prerotation Vanes cannot close quickly enough to correct
for this sudden increase in current and the chiller will
trip on an overcurrent fault.
If the chiller will not restart, but keeps tripping on this
same shutdown, an output pole problem is the most
likely cause. The VSD would require service under
these conditions.
“VSD – HIGH PHASE B
INSTANTANEOUS CURRENT”
See “High Phase A Instantaneous Current” message
above.
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OptiView Control Center
FORM 160.55-O1 (604)

“VSD – HIGH PHASE C
INSTANTANEOUS CURRENT”
See “High Phase A Instantaneous Current” message
above.
“VSD – PHASE A GATE DRIVER”
A second level of current protection exists on the VSD
driver boards themselves. The collector-to-emitter saturation voltage of each IGBT is checked continuously
while the device is gated on. If the voltage across the
IGBT is greater than a set threshold, the IGBT is gated
off and a shutdown pulse is sent to the VSD logic board
shutting down the entire VSD system. A gate driver fault
can be initiated when the VSD is not running.
“VSD – PHASE B GATE DRIVER”
See “Phase A Gate Driver” message above.
“VSD – PHASE C GATE DRIVER”
See “Phase A Gate Driver” message above.
“VSD – SINGLE PHASE INPUT POWER”
This shutdown is generated by the SCR trigger control
and relayed to the VSD logic board to initiate a system
shutdown. The SCR Trigger control uses circuitry to
detect the loss of any one of the three input phases. The
Trigger will detect the loss of a phase within one half line
cycle of the phase loss. This message is also displayed
every time power to the VSD is removed or if the input
power dips to a very low level.
“VSD – HIGH DC BUS VOLTAGE”
The VSD’s DC link voltage is continuously monitored
and if the level exceeds 745VDC, a Bus Over-Voltage
shutdown is initiated. If this shutdown occurs, it will be
necessary to look at the level of the 460VAC applied to
the drive. The speciÞed voltage range is 414 to 508VAC.
If the incoming voltage is in excess of 508VAC, steps
should be taken to reduce the voltage to within the
speciÞed limits.
“VSD – LOGIC BOARD POWER SUPPLY”
This shutdown is generated by the VSD logic board and
it indicates that the low voltage power supplies for the
logic boards have dropped below their allowable operating limits. The power supplies for the logic boards
are derived from the secondary of the 120 to 24VAC
transformer, which in turn, is derived from the 480 to
120VAC control power transformer. This message usually means the power to the VSD has been removed.
“VSD – LOW DC BUS VOLTAGE’
If the DC link drops below 500VDC (or 414VDC for 50
102

Hz applications), the drive will initiate a system shutdown. A common cause for this shutdown is a severe
sag in the incoming power to the drive. Monitor the
incoming three-phase AC line for severe sags and also
monitor the DC link with a voltmeter.
“VSD – DC BUS VOLTAGE IMBALANCE”
The DC link is Þltered by many large electrolytic capacitors, rated for 450VDC. These capacitors are wired
in series to achieve 900VDC capability for the DC link.
It is important that the voltage be shared equally from the
junction of the center or series capacitor connection, to the
negative bus and the positive bus. This center point should
be approximately ½ of the total DC link voltage. Most
actual bus voltage imbalance conditions are caused by a
shorted capacitor or a leaky or shorted IGBT transistor
in an output phase bank assembly. This usually indicates
the VSD requires service.
“VSD – PRECHARGE – DC BUS VOLTAGE IMBALANCE”
This message indicates the same as the “VSD-DC Bus
Voltage imbalance” message above, except the condition
occurred during the Pre-lube period.
“VSD – HIGH INTERNAL AMBIENT TEMPERATURE”
The ambient temperature monitored is actually the
temperature detected by a component mounted on the
VSD logic board. The high ambient trip threshold is set
for 140°F. Some potential causes for this shutdown are:
internal VSD fan failure, VSD water pump failure or an
entering condenser water temperature that exceeds the
allowable limit for the job. Additional causes for the
shutdown are:
• Plugged Strainer – The standard 1.5” Y-strainer
contains a woven mesh element with 20 stainless
steel wires per inch. This has been found to work adequately on most applications. Some users may have
very dirty condenser water, which can cause the
strainer to plug. Locations with special conditions
may want to consider a dual strainer arrangement
with quarter turn valves, to permit cleaning of one
strainer with the unit still on line.
• Plugged Heat-exchanger – In cases where the
strainer plugs frequently, the heat-exchanger may
eventually plug or become restricted to the point of
reduced ßow. At this point, we suggest you backßush the heat-exchanger by reversing the two rubber
hoses which supply condenser water to-from the
heat-exchanger. If the rust cannot be back-ßushed,
the heat-exchanger might have to be replaced.
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FORM 160.55-O1 (604)

• Low Condenser Flow – The VSD system requires
8 feet of pressure drop across the heat exchanger
to maintain adequate GPM. If the pressure drop is
less than 8 feet, it will be necessary to correct the
ßow problem or add a booster pump as is applied
on retroÞt chillers.
“VSD – INVALID CURRENT SCALE
SELECTION”
Since the part number of the VSD Logic Board is the
same on all horsepower sizes, the position of Program
Jumpers tells the Logic Board the size of the VSD
employed. This allows the VSD to properly scale the
output current. If the Jumper conÞguration is invalid, a
shutdown is performed and this message is generated.
Refer to YORK VSD Service manual 160.00-M1.
“VSD – LOW PHASE A INVERTER HEATSINK
TEMPERATURE”
(Style D VSD)
A Heatsink temperature sensor indicating a temperature
<37°F will cause the chiller to shut down and display
this message. In most cases, the problem will be an open
thermistor or broken wiring to the thermistor. The normal thermistor resistance is 10K ohms at 77°F.
“VSD – LOW PHASE B INVERTER HEATSINK
TEMPERATURE”
(Style D VSD)
See “Low Phase A Inverter Heatsink Temperature”
message above.
“VSD – LOW PHASE C INVERTER HEATSINK
TEMPERATURE”
(Style D VSD
See “Low Phase A Inverter Heatsink Temperature”
message above.
“VSD – LOW CONVERTER HEATSINK
TEMPERATURE”
If VSD part number is 371-02767-XXX (60 Hz) or
371-03700-XXX (50 Hz), a heatsink temperature sensor
indicating a temperature of <37ºF will cause the chiller
to shutdown and display this message. In most cases,
the problem will be an open thermistor or broken wiring to the thermistor. The normal thermistor resistance
is 10K ohms at 77ºF.
“VSD – LOW PHASE A INVERTER BASEPLATE
TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
YORK INTERNATIONAL

The chiller has shutdown because the baseplate temperature has decreased to <37 ºF.
“VSD – LOW PHASE B INVERTER BASEPLATE
TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the baseplate temperature has decreased to <37 ºF.
“VSD – LOW PHASE C INVERTER BASEPLATE
TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the baseplate temperature has decreased to <37 ºF.
“VSD – LOW INVERTER BASEPLATE TEMPERATURE”
(Applicable to VSD with part number 371-02767XXX (60 Hz) or 371-03700-XXX (50 Hz))
(Requires Flash Memory Card version C.MLM.02.02A.xxx and later)
A baseplate temperature sensor indicating a temperature
of <37ºF will cause the chiller to shut down and display
this message. In most cases, the problem will be an open
thermistor or broken wiring to the thermistor. The normal thermistor resistance is 5K ohms at 77ºF.
“VSD – PRECHARGE – LOW DC BUS
VOLTAGE”
During Pre-charge, the DC link must be equal to or
greater than 50VDC (41VDC for 50 Hz) within ½ second
and 500VDC within 15 seconds after the Pre-charge relay is energized. If this condition is not met, a shutdown
is performed and this message is generated.
“VSD – LOGIC BOARD PROCESSOR”
This shutdown is generated if a communications problem occurs between the two microprocessors on the
VSD Logic Board.
“VSD – RUN SIGNAL”
Redundant RUN signals are generated by the OptiView
Control Center; one via TB6-24 and the second via the
Serial Communications link. Upon receipt of either of
the two RUN commands by the VSD, a 5 second timer
shall commence timing. If both run commands are not
received by the VSD Logic Board within 5 seconds, a
shutdown is performed and this message is displayed.
103

OptiView Control Center
FORM 160.55-O1 (604)

This is generally indicative of a wiring problem between
the OptiView Control Center and the VSD.

venting the chiller from starting, the VSD will require
service.

“VSD – SERIAL COMMUNICATIONS”
This message is generated when communications between the Adaptive Capacity Control (ACC) Board
and the VSD Logic Board or between the OptiView
Control Center Microboard and the VSD Logic Board,
is disrupted. This is generally indicative of defective
wiring between J11 on the VSD Logic Board and J8 on
the ACC Board.

“HARMONIC FILTER – HIGH PHASE B
CURRENT”
See “Harmonic Filter – High Phase A Current” message above.

“HARMONIC FILTER – LOGIC BOARD OR
COMMUNICATIONS”
This message is generated when communications between the Harmonic Þlter and the VSD Logic Board, is
disrupted. If equipped with Flash Memory Card version
C.MLM.02.03.xxx and later, the communications must
be interrupted for 10 continuous communications cycles
(20 seconds) before the shutdown will occur.
“HARMONIC FILTER – HIGH DC BUS
VOLTAGE”
The Harmonic Þlter’s DC Link voltage is continuously
monitored and if the level exceeds 860VDC, this shutdown is performed. The Harmonic Filter has its own
DC bus as part of the Filter power assembly and this
DC Link is not connected in any way with the VSD’s
DC link. If this shutdown occurs, it will be necessary
to look at the level of 460VAC applied to the Harmonic
Filter. The speciÞed voltage range is 414 to 508. If the
incoming voltage is in excess of 508, steps should be
taken to reduce the level to within speciÞed limits. The
cause of this message is typically high line voltage or a
surge on the utility supply.
“HARMONIC FILTER – HIGH PHASE A
CURRENT”
The maximum instantaneous harmonic Þlter current is
monitored and compared to a preset limit. If this limit
is exceeded, a shutdown is performed and this message
is generated. The Filter current is monitored using two
DCCT’s and these signals are processed by the Þlter
logic board. The preset limits are as follows:
351/292 HP
503/419 HP
790/658 HP

=
=
=

356 Amps
496 Amps
745 Amps

If the VSD automatically restarts after this shutdown and
continues to operate properly with the Þlter operating,
it is likely the Þlter tripped due to a sag or surge in the
voltage feeding the VSD. If this message reoccurs, pre104

“HARMONIC FILTER – HIGH PHASE C
CURRENT”
See “Harmonic Filter – High Phase A Current” message.
“HARMONIC FILTER – PHASE LOCKED
LOOP”
This shutdown indicates that a circuit called “Phase
Locked Loop” on the Þlter logic board has lost synchronization with the incoming power line. This is usually
indicative of an open fuse in one of the Þlter’s incoming
power line. Filter power fuses 11FU, 12FU and 13FU
should be checked.
“HARMONIC FILTER – PRECHARGE –
LOW DC BUS VOLTAGE”
During pre-charge, the Þlter’s DC link must be equal
to or greater than 50VDC (41VDC for 50 Hz) within
1/10 second after the pre-charge relay is energized. If
this condition is not met, a shutdown is performed and
this message is generated.
“HARMONIC FILTER – LOW DC BUS
VOLTAGE”
The Harmonic Filter generates its own Þlter DC link
voltage by switching its IGBT’s. This DC level is actually higher than the level that one could obtain by simply rectifying the input line voltage. Thus, the harmonic
Þlter actually performs a voltage “boost” function. This
is necessary in order to permit current to ßow into the
power line from the Þlter when the input line is at its
peak level. This shutdown occurs when the Þlter’s DC
link voltage decreases to a level less than 60VDC below the Þlter DC link voltage setpoint. This Setpoint is
determined by the Þlter logic board via the sensing of
the three phase input line-to-line voltage. This setpoint
is set to the peak of the sensed input line-to-line voltage
plus 32 volts, not to exceed 760 volts and it varies with
the input line-to-line voltage. If this shutdown occurs
occasionally, the likely cause is a severe sag in the input
line voltage.
“HARMONIC FILTER – DC BUS VOLTAGE IMBALANCE”
The Þlter DC link is Þltered by large, electrolytic capacitors, rated for 450VDC. These capacitors are wired
YORK INTERNATIONAL

FORM 160.55-O1 (604)

in series to achieve a 900VDC capability for the DC
link. It is important the voltage is shared equally from
the junction of the center or series capacitor connection,
to the negative bus and to the positive bus. This center
point should be approximately ½ of the total DC link
voltage.
“HARMONIC FILTER – INPUT
CURRENT OVERLOAD”
The three phases of RMS Þlter current are monitored
and if any one of the three phases continuously exceeds
a given threshold for 7 seconds, a chiller shutdown is
performed and this message is displayed. The maximum
permissible continuous RMS current ratings for the harmonic Þlter are:
351/292 HP
503/419 HP
790/658 HP

=
=
=

128 AMPS
176 AMPS
277 AMPS

“HARMONIC FILTER – LOGIC BOARD
POWER SUPPLY”
The low voltage power supplies on the Þlter logic board
have decreased below their permissible operating range.
The Þlter logic board receives its power from the VSD
logic board via the ribbon cable, connecting the two
boards.
“HARMONIC FILTER – RUN SIGNAL”
When a digital run command is received at the Þlter logic
board from the VSD logic board via the 16 position ribbon cable, a 1/10 second timer is started. If a redundant
run command does not occur on the serial data link from
the VSD logic board before the timer expires, a shutdown is performed and this message is generated.
“HARMONIC FILTER – DC CURRENT
TRANSFORMER 1”
During initialization, with no current ßowing through the
DC Current Transformers (DCCT’s), the DCCT output
voltages are measured and compared with a preset limit
via the Þlter logic board. If the measured values exceed
the preset limits, the DCCT’s are presumed to be defective and this shutdown is generated.
“HARMONIC FILTER – DC CURRENT
TRANSFORMER 2”
See “Harmonic Filter – DC Current Transformer 1”
message above.

SAFETY SHUTDOWN MESSAGES
“EVAPORATOR – LOW PRESSURE”
(This message is applicable only if the Smart Freeze
feature is not activated. If Smart Freeze is activated and
has initiated the shutdown, “Evaporator – Low Pressure
– Smart Freeze” is displayed as described next.)
The evaporator pressure, as sensed by the Evaporator
Transducer, has decreased to the Safety shutdown threshold. For water cooling applications, the safety shutdown
threshold is a Þxed value for the respective refrigerant. For
Brine cooling applications, the safety shutdown threshold
varies according to the concentration of the Brine solution. The Brine shutdown threshold is programmed at the
YORK Factory. It should not be changed by anyone other
than a qualiÞed Service Technician following instructions
in YORK Service Manual 160.55-M1. The chiller can be
started after the evaporator pressure increases to the restart
threshold and the COMPRESSOR switch is placed in the
Stop-Reset (O) position.
Shutdown (PSIA)
Water cooling Brine cooling -

Restart (PSIA)

R11

<5.4

>5.4

R123

<4.4

>4.4

0.0 to 12.5
as programmed

>
Shutdown threshold

R11/R123

“EVAPORATOR – LOW PRESSURE – SMART
FREEZE”
Smart Freeze Protection is activated and has shut down
the chiller because the evaporator temperature has been
below the Smart Freeze threshold for greater than the allowable number of seconds. If the evaporator refrigerant
temperature sensor RT7 is Enabled (using procedure in
Service Manual 160.55-M1), this parameter is used as
the evaporator refrigerant temperature and the freeze
threshold is 32.8°F. If RT7 is not Enabled, the evaporator
refrigerant temperature used is the Evaporator Saturation Temperature, derived from the Evaporator Pressure
Transducer and the freeze threshold is 34.0°F.
The count is incremented once for every second the
evaporator refrigerant temperature is below the freeze
threshold (but is never decremented below zero). The
number of seconds it will take the chilled liquid to
freeze is based on how far the evaporator refrigerant
temperature is below the freeze threshold as follows:
Number of seconds to freezing = (4053.7) / (freeze
threshold-evaporator refrigerant temperature)
Smart Freeze is activated only if the feature has been

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105

OptiView Control Center
FORM 160.55-O1 (604)

Enabled by a Service Technician (following instructions
in Service Manual 160.55-M1) and the Leaving Chilled
Liquid temperature Setpoint is <38.0°F.
“EVAPORATOR – TRANSDUCER OR LEAVING
LIQUID PROBE”
A possible defective Evaporator pressure Transducer
or Leaving Chilled Liquid temperature Thermistor has
been detected. The pressure and temperature that these
devices are indicating are not in the correct relationship
to each other. The OptiView Control Center converts the
evaporator pressure to a Saturated Temperature value
and compares this value to the Leaving Chilled Liquid
temperature (difference = chilled liquid temp – evaporator saturated temp). The difference should not be outside the range of –2.5°F to +25.0°F. If the Transducer
and Thermistor are accurate, the Evaporator Saturated
temperature should not be > 2.5°F warmer nor > 25.0°F
colder than the leaving chilled liquid temperature. In order to initiate a shutdown, the difference must be outside
the acceptable range continuously for 10 minutes. For
Steam Turbine drive applications, this check is bypassed
for the Þrst 20 minutes of chiller operation. The chiller
can be started after the COMPRESSOR switch is placed
in the Stop-Reset (O) position.
“EVAPORATOR – TRANSDUCER OR
TEMPERATURE SENSOR”
A possible defective Evaporator pressure Transducer
or Refrigerant Temperature Sensor has been detected.
The OptiView Control Center converts the evaporator
pressure to a Saturated Temperature value and compares this value to the optional Evaporator Refrigerant
Temperature Sensor. If the difference between these
temperatures is greater than 3.0°F, continuously for 1
minute, this shutdown is performed. This check is only
performed under the following conditions:
• Chiller has been running for at least 10 minutes
• Evaporator Refrigerant temperature (RT7) has been
enabled by a Service technician using instructions
in YORK Service Manual 160.55.M1
• Not in Brine cooling mode
• Smart Freeze is enabled (Flash Memory Card version C.MLM.02.02.xxx and later)
• Evaporator Temperature Sensor (RT7) or Evaporator Saturation Temperature is indicating a temperature of <32.0ºF (Flash Memory Card version
C.MLM.02.02.xxx and later)

“CONDENSER – HIGH PRESSURE
CONTACTS OPEN”
The contacts of the electro-mechanical high pressure
safety device, located on the condenser shell, have
opened because this device has detected a pressure >
29.7 PSIA. The contacts will automatically close when
the condenser pressure decreases to < 23.7 PSIA. The
chiller can be started after the contacts close and the
COMPRESSOR switch is placed in the Stop-Reset
(O) position.
“CONDENSER – HIGH PRESSURE”
The condenser pressure, as sensed by the Condenser
Transducer, has increased to >29.7 PSIA. The chiller
can be started after the pressure decreases to <23.7 PSIA
and the COMPRESSOR switch is placed in the StopReset (O) position.
“CONDENSER – HIGH PRESSURE –
STOPPED”
(Software versions C.MLM.02.06.xxx and later or
C.OPT.02.06.303 and later)
The condenser pressure exceeded 26.7 PSIA while the
chiller was stopped. High temperature condenser water
ßowing through the condenser while the chiller is shutdown can cause a condenser high pressure condition
resulting in loss of refrigerant. This safety fault anticipates this problem by annunciating the condenser high
pressure condition. The chiller can be restarted after a
Service Technician performs a special reset preset procedure contained in YORK Service Manual 160.55-M1.
“CONDENSER – PRESSURE TRANSDUCER OUT
OF RANGE”
The Condenser Pressure Transducer is indicating a
pressure that is >35.3 PSIA. This is outside the normal
operating range of the transducer. This is generally indicates a defective transducer. The chiller can be started
after the transducer is indicating a pressure that is < 35.3
PSIA and the COMPRESSOR switch is placed in the
Stop-Reset (O) position.
“AUXILIARY SAFETY – CONTACTS CLOSED”
The Auxiliary Safety shutdown contacts, connected
to I/O Board TB4-31 have closed, initiating a safety
shutdown. This input is a general-purpose, user deÞned
safety shutdown input. The chiller can be started after
the contacts open and the COMPRESSOR switch is
placed in the Stop-Reset (O) position.

The chiller can be started after the temperatures are
within 3.0°F of one another and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
106

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FORM 160.55-O1 (604)

“DISCHARGE – HIGH TEMPERATURE”
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has increased to > 220.0°F. The
chiller can be started after the temperature decreases to
< 220.0°F and the COMPRESSOR switch is placed in
the Stop-Reset (O) position.
“DISCHARGE – LOW TEMPERATURE”
The discharge temperature, as sensed by the Discharge
Temperature Thermistor, has decreased to < 30.0°F. The
chiller can be started after the temperature increases to
> 30.0°F and the COMPRESSOR switch is placed in
the Stop-Reset (O) position.
“OIL – HIGH TEMPERATURE”
The oil temperature, as sensed by the Oil Temperature
Thermistor, has increased to > 180.0°F. The chiller can
be started after the temperature decreases to < 180.0°F
and the Compressor switch is placed in the Stop-Reset
(O) position.
“OIL – LOW DIFFERENTIAL PRESSURE”
The differential oil pressure decreased to < 15.0 PSID
while the chiller was running or failed to achieve 20.0
PSID during the last 5 seconds of the “System Prelube”
period. The differential oil pressure is the difference
between the output of the Sump Oil Pressure Transducer
(system low pressure) and the output of the Pump Oil
Pressure Transducer (system high pressure). The chiller
can be started after the COMPRESSOR switch is placed
in the Stop-Reset (O) position.
“OIL - HIGH DIFFERENTIAL PRESSURE”
The differential oil Pressure increased to > 60.0 PSID
while the oil pump was running. The differential oil
pressure is the difference between the output of the
Sump Oil Pressure Transducer (system low pressure)
and the output of the Pump Oil Pressure Transducer
(system high pressure). The chiller can be started after
the differential oil pressure decreases to < 60.0 PSID
and the COMPRESSOR switch is placed in the Stopreset (O) position.
“CONTROL PANEL – POWER FAILURE”
A Control Power failure has occurred. If the power
failure duration was < the duration of the applicable
“Coastdown” period (2.5 minutes standard; 15 minutes
steam turbine), the remainder of the “Coastdown” is
performed upon restoration of power. The chiller can
be started after the COMPRESSOR switch is placed in
the Stop-reset (O) position. This message can indicate
a Cycling (auto-restart after power failure) or Safety
(manual restart after power failure) shutdown, depending
YORK INTERNATIONAL

upon Control Center conÞguration. It indicates a Cycling shutdown when displayed in orange characters;
Safety shutdown when displayed in red characters. The
OptiView Control center is conÞgured for auto-restart
or manual restart after power failure by a qualiÞed Service technician following instructions in YORK Service
Manual 160.55-M1.
“MOTOR OR STARTER – CURRENT
IMBALANCE”
The three phase compressor motor current imbalance
was > 30% continuously for 45 seconds. The imbalance
is not checked until the chiller has been running for at
least 45 seconds and the average of the three phases of
motor current is > 80% of the programmed 100% chiller
Full Load Amps. The average is calculated as: Iave =
(Ia+Ib+Ic) ÷ 3. The imbalance is calculated as:
(Ia-Iave) + (Ib-Iave) + (Ic-Iave)
x 100
2(Iave)
The Style B Solid State Starter detects the unbalance
condition and advise the Optiview Control Center
Microboard via serial communications. The Style A
Solid State Starter and Variable Speed Drives returns
the 3-phase motor current values to the Optiview Control
Center Microboard where the unbalance calculation is
performed. This safety shutdown is not performed on
Electro-mechanical starter applications
“WATCHDOG – SOFTWARE REBOOT”
The Microboard’s software Watchdog initiated a Microprocessor reset because it detected that a portion of
the chiller operating Program was not being executed.
The result of this reset is a Safety shutdown and re-initialization of the Program. This is generally indicative
of a severe electrical power disturbance or impending
Microboard Failure. The chiller can be started after the
COMPRESSOR switch is placed in the Stop-Reset (O)
position.
“SURGE PROTECTION – EXCESS SURGE”
(Flash Memory Card version C.MLM.02.02.xxx
and later)
(Applies only if Surge Protection SHUTDOWN feature
is Enabled) The Surge Window Count surge events exceeded the Count Limit setpoint. If the Surge Protection
Extended Run feature is Disabled, the chiller shutsdown
as soon as the count exceeds the limit. If the Extended
Run feature is Enabled, this shutdown occurs only if the
count exceeds the limit at completion of the 10 minute
Extended Run period. The chiller can be started after
the COMPRESSOR Switch is placed in the Stop-Reset
(O) position.
107

OptiView Control Center
FORM 160.55-O1 (604)

MOD “B” SOLID STATE STARTER
SAFETY SHUTDOWN MESSAGES
“LCSSS SHUTDOWN – REQUESTING FAULT
DATA...”
The Liquid Cooled Solid State Starter Logic/Trigger Board
has shut down the chiller but the Control Center has not
yet received the cause of the fault from the LCSSS, via
the serial communications link. The LCSSS shuts down
the chiller by opening the Motor Controller LCSSS Stop
Contacts (K1 relay located on the Logic/Trigger Board
and connected between TB6-16 and TB6-53 in the Control Center). The Microboard, in the Control Center,
then sends a request for the cause of the fault to the
Logic/Trigger Board over the serial communications
link. Since serial communications are initiated every 2
seconds, this message is typically displayed for a few
seconds and then replaced with the one of the below
listed fault messages.
“LCSSS – HIGH INSTANTANEOUS CURRENT”
The Liquid Cooled Solid State Starter Logic/Trigger
Board detected that the compressor motor current in
any phase exceeded 1.1(1.414xRMS value of the programmed Start Current) for a minimum of 1 second. The
chiller can be started after the COMPRESSOR switch
is placed in the Stop-Reset (O) position.
“LCSSS – HIGH TEMPERATURE PHASE X
– RUNNING”
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected the temperature of phase A, B or
C (designed as X in the message) Silicon Controlled
RectiÞer (SCR) Modules has exceeded 212°F while
the chiller was running. The safety can be reset after all
SCR temperatures are < 210°F and the COMPRESSOR
switch is placed in the Stop-Reset position (O). However,
the chiller cannot be started until all SCR temperatures
are < 109°F. During the shutdown, the starter cooling
pump runs until the temperature is < 109°F.
“LCSSS – 105% MOTOR CURRENT OVERLOAD”
The highest phase of the compressor motor current increased to > 105% of the programmed 100% chiller Full
Load Amps continuously for 40 seconds. The chiller can
be started after the COMPRESSOR switch is placed in
the Stop-Reset (O) position.
“LCSSS – PHASE X SHORTED SCR”
A shorted Silicon Controlled RectiÞer (SCR) in phase
A, B or C (designated as X in the message) has been
detected by the Liquid Cooled Solid State Starter
108

Logic/Trigger Board. The voltage across each SCR in
monitored to detect the shorted condition. The shorted
condition must exist continuously for 5 seconds in order
to annunciate the fault. This check is disabled while the
chiller is running. The chiller can be started after the
condition has been corrected and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
“LCSSS – OPEN SCR”
An open Silicon Controlled RectiÞer (SCR) has been
de tect ed by the Liquid Cooled Solid State Starter
Logic/Trigger Board. The open condition must exist
continuously for 5 seconds in order to annunciate the
fault. The chiller can be started after the condition has
been corrected and the COMPRESSOR switch is placed
in the Stop-Reset (O) position. This check is disabled
when the chiller is shut down. In certain applications,
local power line conditions could interfere with the open
SCR detection technique. This requires a qualiÞed Service Technician to disable this check. Refer to YORK
Service Manual 160.55-M1.
“LCSSS – PHASE (X) OPEN SCR”
(Software versions C.MLM.02.06.xxx and later or
C.OPT.02.06.303 and later)
An open SCR in phase A, B or C (designated as X in
message) has been detected. This safety shutdown has
the same criteria as “LCSSS – OPEN SCR” above.
However, when the Solid State Starter Logic/Trigger
Board is equipped with Eprom version C.SSS.01.03 (and
later) and the Optiview Control Center is equipped with
above software, the phase in which the open SCR occurred is identiÞed
“LCSSS – PHASE ROTATION”
(Flash memory Card version C.MLM.02.01 or later)
The Liquid Cooled Solid State Starter Logic/Trigger Board
has detected the three phase compressor motor power line
voltage phase rotation is not correct. The chiller can be started
after the phase rotation is correct and the COMPRESSOR
Switch is placed in the Stop-Reset (O) position.

COMPRESSOR MOTOR VARIABLE
SPEED DRIVE:
SAFETY SHUTDOWN MESSAGES
The following Safety shutdown messages are displayed
on Compressor Motor variable Speed Drive (VSD) applications only. These messages are generated by events
that occur within the VSD. The chiller can be started
after manual resets are performed as detailed below.
Service and troubleshooting information is contained
in YORK Manual 160.00-M1.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

“VSD SHUTDOWN – REQUESTING FAULT
DATA”
The VSD has shut down the chiller and the control
center has not yet received the cause of the fault from
the VSD, via the serial communications link. The VSD
shuts down the chiller by opening the Motor Controller “VSD Stop Contacts” (located on the VSD Logic
Board and connected between TB6-16 and TB6-53 in
the Control Center). The Microboard in the Control
Center then sends a request for the cause of the fault to
the VSD Logic Board via the Adaptive Capacity Control
Board, over the serial link. Since serial communications
are initiated every 2 seconds, this message is typically
displayed for a few seconds and then replaced with one
of the following fault messages.
“VSD – 105% MOTOR CURRENT OVERLOAD”
This shutdown is generated by the VSD Logic Board
and it indicates that a motor overload has occurred. The
shutdown is generated when the VSD Logic Board has
detected that at least 1 of the 3 output phase currents has
exceeded 105% of the chiller Full Load Amps (FLA)
value for > 7 seconds. The chiller FLA value is set
by adjustment of the FLA potentiometer on the VSD
Logic Board. The chiller can be started after the RESET
push-button on the VSD Logic Board is pressed and
the COMPRESSOR switch is placed in the Stop-reset
position (O).
“VSD – HIGH PHASE A INVERTER HEATSINK
TEMPERATURE”
(Style D VSD)
This shutdown will occur if the heatsink temperature
exceeds 158°F on any of the output pole assemblies.
This shutdown will seldom occur. In most cases where
the coolant temperature has risen abnormally, the VSD
will shut down on “Ambient Temperature” @ 140.0 °F
before the heatsinks can reach 158°F. If this message
is displayed, make sure there is adequate coolant level,
ascertain the pump is operating when the chiller is running and check the strainer in the primary of the heat
exchanger for clogs and silt. The chiller can be started
after the fault condition clears, the RESET button on the
VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset position (O).
“VSD – HIGH PHASE B INVERTER
HEATSINK TEMPERATURE”
(Style D VSD)
See Phase A message above.

YORK INTERNATIONAL

“VSD – HIGH PHASE C INVERTER
HEATSINK TEMPERATURE”
(Style D VSD)
See Phase A message above.
“VSD – HIGH CONVERTER HEATSINK TEMPERATURE”
(Style D VSD)
See Phase A message above.
“VSD – HIGH CONVERTER HEATSINK TEMPERATURE”
(Applicable to VSD with part number 371-02767XXX (60 Hz) and 371-03700-XXX (50 Hz))
(Requires Flash Memory Card version C.MLM.02.02A.xxx and later)
This shutdown will occur if the heatsink temperature
exceeds 170ºF. The chiller can be started after the fault
condition clears and the COMPRESSOR Switch is
placed in the Stop-reset (O) position.
“VSD - HIGH INVERTER BASEPLATE TEMPERATURE”
(Applicable to VSD with part number 371-02767XXX (60 Hz) and 371-03700-XXX (50 Hz))
(Requires Flash Memory Card version C.MLM.02.02A.xxx and later)
This shutdown will occur if the baseplate temperature
exceeds 175ºF. The chiller can be started after the fault
condition clears, the RESET button on the VSD Logic
Board is pressed and the COMPRESSOR Switch is
placed in the Stop-reset position (O).
“VSD – HIGH PHASE A INVERTER BASEPLATE TEMPERTURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the baseplate temperature has increased to >158 ºF. The chiller can be stated
after the fault condition clears, the RESET button on the
VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
“VSD – HIGH PHASE B INVERTER BASEPLATE TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the baseplate temperature has increased to >158 ºF. The chiller can be stated
after the fault condition clears, the RESET button on the
109

OptiView Control Center
FORM 160.55-O1 (604)

VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
"VSD – HIGH PHASE C INVERTER BASEPLATE TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the baseplate temperature has increased to >158 ºF. The chiller can be stated
after the fault condition clears, the RESET button on the
VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
“VSD – PRECHARGE LOCKOUT”
If the VSD fails to make Pre-charge, the Pre-charge
relay shall drop out for 10 seconds during which time
the VSD’s fans and water pumps shall remain energized
in order to permit the Pre-charge resistors to cool. Following this 10-second cool down period, Pre-charge
shall again be initiated. The VSD shall attempt to make
Pre-charge 3 consecutive times. If the VSD fails to
make Pre-charge on 3 consecutive tries, the unit will
shut down, lockout and display this message. The chiller
can be started after the COMPRESSOR switch is placed
in the Stop-reset (O) position.
“HARMONIC FILTER – HIGH HEATSINK TEMPERATURE”
(Style D VSD)
The Harmonic Filter power assembly has one heatsink
thermistor on the 351 and 503 HP units and two heatsink
thermistors on the 790 HP units. If the temperature on
any heatsink exceeds 167°F, the unit will shut down.
This message is usually an indication of a low coolant level in the VSD cooling loop. The chiller can be
started after the fault condition clears, the OVERTEMP
RESET button on the Filter Logic Board is pressed and
the COMPRESSOR switch is placed in the Stop-reset
(O) position.

110

“HARMONIC FILTER – HIGH BASEPLATE
TEMPERATURE”
(Applicable to VSD with part number 371-02767XXX (60 Hz) and 371-03700-XXX (50 Hz))
(Requires Flash Memory Card version C.MLM.02.02A.xxx and later)
This shutdown occurs when the Baseplate temperature
exceeds 174ºF (79ºC). The chiller can be started after the
fault condition clears, the OVERTEMP RESET button
on the Filter Logic Board is pressed and the COMPRESSOR Switch is placed in the Stop-reset position (O).
“HARMONIC FILTER – HIGH BASEPLATE
TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the Baseplate temperature has increased to >194 ºF. The chiller can be
started after the fault condition clears, the OVERTEMP
reset button on the Filter Logic Board is pressed and
the COMPRESSOR switch is placed in the stop-reset
(O) position
“HARMONIC FILTER – HIGH TOTAL
DEMAND DISTORTION”
This shutdown indicates the Þlter is not operating correctly and the input current to the VSD/Filter is not sinusoidal. This shutdown will occur if the TDD exceeds
25% continuously for 45 seconds. TDD is an acronym
for Total Demand Distortion, a term deÞned by the IEEE
Std 519-1992 standard as the “total root-sum-square harmonic current distortion, in percent of the maximum
demand load current (15 or 30 min demand)”. In the
Filter option supplied by YORK, the displayed TDD is
the total RMS value of all the harmonic current supplied
by the main power to the VSD divided by the chiller
Full Load Amps, in percent. A standard VSD, less the
optional Þlter typically has an input current TDD level
on the order of 28-30%. The chiller can be started after
the COMPRESSOR switch is placed in the Stop-reset
position (O).

YORK INTERNATIONAL

FORM 160.55-O1 (604)

THIS PAGE INTENTIONALLY LEFT BLANK
TO MAINTAIN FORMAT

YORK INTERNATIONAL

111

Printers
FORM 160.55-O1 (604)

SECTION 3
PRINTERS

23887A

OKIDATA MICROLINE 184

WEIGH-TRONIX

23889A

00085VIP

SEIKO DPU-414

FIG. 43 – PRINTERS
112

YORK INTERNATIONAL

FORM 160.55-O1 (604)

A printer can be connected to the Control Center’s
Microboard to print the following reports. The screen
from which each report can be generated is listed in
parenthesis.
• Status - Present system parameters (Printer,
Home)
• Setpoints - Present programmed values of all setpoints (Printer, Setpoints)
• Schedule - Present value of programmed daily
schedule (Printer, Schedule)
• Sales Order - Information on Sales Order Screen
(Printer, Sales Order)
• History - System parameters at the time of the last
normal stop, last fault while running and last 10
faults, whether running or not (Printer, History)
• Cycling or Safety shutdown initiated Print - Snapshot of all system parameters at instant of shutdown.
Automatically occurs if printer is connected at time
of shutdown.
• Adaptive Capacity Control (ACC) surge Map
- System conditions at instant all surge points were
mapped. (Compressor Motor Variable Speed Drive
applications; requires SERVICE access level)
(Printer, ACC)
• Trend (Flash Memory card version C.MLM.
02.02.xxx and later) - Prints a snapshot of the existing trend screen data or prints new data collected
after the trend print key is pressed.
The printer can be permanently connected to the Control
Center or connected as required to produce a report. If
permanently connected, a DATA LOGGING feature
can produce a Status report automatically, beginning
at an Operator selected start time and occurring at an
Operator selected interval thereafter.
The following Þgures are examples of the different print
reports. Solid State Starter application print reports
shown. Electro-mechanical starter and Variable Speed
Drive reports are similar but print parameters applicable
to those devices.
• Figure 44 - Status
• Figure 45 - Setpoints
• Figure 46 - Schedule
• Figure 47 - Sales Order
• Figure 48 - History
• Figure 49 - Security Log (Flash Memory Card version C.MLM.02.03.xxx and later)
• Figure 50 - Trend (Flash Memory Card version
C.MLM.02.02.xxx and later)
• Figure 51 - Custom Screen
YORK INTERNATIONAL

• Figure 52 - Adaptive Capacity Control New Map
point Report
• Figure 53 - Adaptive Capacity Control
Existing Map points Report
PRINTERS

The following Printers can be used. Printers must be
equipped with an RS-232 Serial interface.
• Okidata –
Models: 182,182 turbo, 184 turbo
Dimensions: 14 in. wide x 10.5 in. deep
Paper: 8.5 in. wide
Type: Dot matrix impact
Purchase: 800-OKIDATA
• Weigh-Tronix –
Models: 2600, 1220
Dimensions: 2.3 in. wide x 2.8 in. deep
Paper: 2.25 in. wide
Type: Dot matrix impact
Purchase: USA 800-982-6622
International 707-527-5555
• Seiko –
Model: DPU414-30B (Power supply PW4007-U I
required)
Dimensions: 6.3 in. wide x 6.7 in. deep
Paper: 4.4 in. wide
Type: Thermal
Purchase: Reptron Electronics, Inc
Phone: 800-800-5441 ext. 4686
Fax: 813-891-4056
Attn: Nancy Arthur, Account Mgr.
(narthur@reptron.com)
The Control Center provides the required formatting
control codes for the printers above when the printer
is selected on the PRINTER Screen in the instructions
below. These codes are transmitted through the serial
interface to the printer to provide a proper print format.
Different printers require different formatting control
codes. Other printers might provide proper operation
when connected to the Control Center. However, the
print format may not be correct or as desired. Proceed
with caution and use the following guidelines if an unlisted printer is selected:
1. All must be capable of RS-232 Serial communications.
2. Primary differences between printers involve the formatting control codes required by the printer. These
113

Printers
FORM 160.55-O1 (604)

codes are sent from the Control Center to the printer.
For example, Weigh-Tronix printers require a control
code to select 40 column width. This same code is
interpreted by the Okidata printer as an instruction
to print wide characters. In some instances, a printer
will ignore a code it cannot interpret.
3. The Control Center requires a busy signal from the
printer when the printer receive buffer is full. This
causes the Control Center to momentarily terminate
data transmission until the printer can accept more
data. The busy signal polarity must be asserted low
when busy.
PRINTER CONNECTIONS

Connect the printers to the Control Center Microboard as
follows. Only one printer can be connected at a time.
• OKIDATA 182, 182 turbo, 184 turbo
Microboard
J2-4
J2-2
J2-9
Cabinet

Printer
pin 3
pin 11
pin 7

Function
Tx (data to printer)
DSR (busy signal from printer)
Gnd
shield

• WEIGH-TRONIX
Microboard
J2-4
J2-2
J2-9
Cabinet

Printer
pin 2
pin 5
pin 7

Function
Tx (data to printer)
DSR (busy signal from printer)
Gnd
shield

Printer
pin 3
pin 8
pin 5

Function
Tx (data to printer)
DSR (busy signal from printer)
Gnd
shield

• SEIKO
Microboard
J2-4
J2-2
J2-9
Cabinet

Hardware required:
Cable – #18 AWG stranded 50ft. maximum length.
Connectors –
- Microboard: None. Strip 1/4" insulation from
wire and insert into screw terminal block.
- Printers: Okidata - 25 pin plug DB-25P or equivalent; Shell DB-C2-J9 or equivalent. Weigh-Tronix
- Same as Okidata. Cable assembly available from
Weigh-Tronix. Seiko - 9-Pin D-type Subminiature
(DB-9 pin male).
114

PRINTER SETUP

The selected printer must be conÞgured as follows.
Refer to manual provided by Printer manufacturer with
respective Printer.
• OKIDATA 182, 182 turbo, 184 turbo Printer
CONTROL BOARD Switch settings:
SW1 - on Unslashed 0
2 - off Unslashed 0
3 - off Unslashed 0
4 - off Form Length 11 in.
5 - on Form Length 11 in.
6 - off Auto Line Feed off
7 - on 8 bit data
8 - off Enable front panel
If equipped with a SUPER SPEED serial Board:
SW1-1 - on Odd or even parity
1-2 - on No parity
1-3 - on 8 bit data
1-4 - on Protocol ready/busy
1-5 - on Test select
1-6 - on Print mode
1-7 - off SDD(-) pin 11
1-8 - on SDD(-) pin 11
2-1 - on 1200 Baud*
2-2 - on 1200 Baud*
2-3 - off 1200 Baud*
2-4 - off DSR active
2-5 - on Buffer threshold 32 bytes
2-6 - on Busy signal 200ms
2-7 - on DTR space after power on
2-8 - not used
If equipped with HIGH SPEED serial board:
SW1 - off (-) Low when busy
2 - off 1200 Baud*
3 - off 1200 Baud*
4 - on 1200 Baud*
5 - not used
6 - off no parity
7 - off Pin 20 & pin 11 act as busy line
• WEIGH-TRONIX Printer
- IMP-24 Model 2600
SW1 - off 1200 Baud*
2 - on 1200 Baud*
YORK INTERNATIONAL

FORM 160.55-O1 (604)

Model 1220
- ConÞgure Menu
Baud= 1200
Data Bits = 8
Stop Bits = 1
Hshake = Busy-Line
Cols = 32
Invert = No
Font = 5 x 8
Mag = None
- Custom Menu
Auto Seq = No
Zero = 0
Pound sign = #
_(Underscore)
Busy invert = no
Online/ofßine = yes
Ext Ch Set = no
Print ready = yes
Set Clock = not used
Reset Seq = not used
• SEIKO
DipSW1-1 = off
1-2 = on
1-3 = on
1-4 = off
1-5 = on
1-6 = off
1-7 = on
1-8 = on
DipSW 2-1= on
2-2 = on
2-3 = on
2-4 = off
2-5 = on
2-6 = on
2-7 = on
2-8 = off
DipSW 3-1= on
3-2 = on
3-3 = on
3-4 = on
3-5 = on

Input-Serial
Printing speed high
Auto loading - on
Auto LF - off
Setting Command - Enable
Printing density - 100%
Printing density - 100%
Printing, density - 100%
Printing Columns - 40
User Font Back-up - on
Character Select - normal
Zero - slash
International character set American
International character set American
International character set American
International character set American
Data length - 8 bits
Parity Setting - no
Parity condition - odd
Busy control - H/W busy
Baud rate select - 1200*

YORK INTERNATIONAL

3-6 = off
3-7 = on
3-8 = off

Baud rate select - 1200*
Baud rate select - 1200*
Baud rate select - 1200*

* Settings shown for 1200 Baud. Other Baud rates can
be selected. Refer to Printer manufacturer’s manual
supplied with Printer.
CONTROL CENTER SETUP

Chiller ID
Access Level Required: OPERATOR or Higher
Using the COMMS Screen, assign an IdentiÞcation
number to the chiller. This number will appear at the
top of each report.
Printer Setup
Access Level Required: OPERATOR or Higher
Using the COMMS Screen, the Control Center must be
conÞgured to transmit data in the same format as the
Printer is conÞgured to receive the data. The following
values must be entered.
• Baud Rate - Set as desired. Value selected must be
the same as Printer conÞguration above.
• Data Bits - 8
• Parity - None
• Stop Bits - 1
Printer Type
Access Level required: OPERATOR or Higher
Using the PRINTER Screen, the actual Printer type connected to the Control Center must be entered. Selection
determines the control codes that are sent to the Printer.
These codes determine such things as lines per inch,
character width and general formatting. Available selections are: Okidata, Weigh-Tronix and Seiko.
Automatic Data Logging
Access Level required: OPERATOR or Higher.
If automatic data logging is desired, a Status Report can
be automatically printed at a speciÞed interval beginning
at a speciÞed time, using the PRINTER Screen. The
interval is programmable over the range of 1 minute
to 1440 minutes in 1 minute increments. The Þrst print
will occur at the programmed START time and occur at
the programmed OUTPUT INTERVAL thereafter. The
time remaining until the next print is displayed on the
PRINTER Screen.
• Automatic Printer Logging - Enables and disables
automatic data logging
• Log Start Time - Enter the time the Þrst print is
desired.
• Output Interval - Enter the desired interval between
prints.
115

Printers
FORM 160.55-O1 (604)

Valve Position
Pre-Rotation Vanes Position
Surge

YORK UPDATE
CHILLER ID
0
YORK Update Chiller ID
-------------------------------------------------------------------------

------------------------------------------------------------------------Total Surge Count
Surge Window Time
Surge Window Count

(c) 1997 – 2001 YORK INTERNATIONAL
CORPORATION
SYSTEM RUN
LEAVING CHILLED LIQUID CONTROL
WARNING – PURGE – FLOAT SWITCH ERROR
[List all warnings presently active]

= 15 %
= 75 %

= 127
= 1 Min
= 0

[Skip the following section if Liquid Level is not
enabled]
Refrigerant Level Control

------------------------------------------------------------------------Controls C.MLM.02.03.102
Run Time
0 Days

2 Hr

Refrigerant Level Position
Ramp Up Time Remaining
[If Ramp Up in effect]

Operating Hours
Number Of Starts
Control Source

59 Min
= 298 Hr
= 106
= Local

= 35 %
= 15 Sec

Purge Control

------------------------------------------------------------------------Evaporator

------------------------------------------------------------------------Leaving Chilled Active Setpoint
Chilled Liquid Pump
Chilled Liquid Flow Switch
Leaving Chilled Liquid Temperature
Return Chilled Liquid Temperature
Evaporator Pressure = 7.2 Psia
Evaporator Saturation Temperature
Evaporator Refrigerant Temperature
[If Refrigerant Sensor enabled]
Small Temperature Difference

=
=
=
=
=

45.0 ~F
Run
Closed
50.0 ~F
59.3 ~F

= 41.1 ~F
= 40.0 ~F
= 10.0 ~F

Condenser

= 42.8 Psia
= 0
= 60 Min

[Skip the following section if Motor Type is not EM]
Electro-Mechanical Starter

------------------------------------------------------------------------Motor Run
% Full Load Amps

= On
= 94 %

[Skip the following section if Motor Type is not Mod A
SSS]
Liquid-Cooled Solid State Starter

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

------------------------------------------------------------------------Condenser Liquid Pump
Condenser Liquid Flow Switch
Leaving Condenser Liquid Temperature
Return Condenser Liquid Temperature
Condenser Pressure
Condenser Saturation Temperature
Small Temperature Difference
Drop Leg Refrigerant Temperature
[If Drop Leg Sensor enabled]
Sub Cooling Temperature
[If Drop Leg Sensor enabled]

Pressure
Exhaust Count
Exhaust Window

=
=
=
=
=
=
=
=

Run
Closed
85.0 ~F
94.9 ~F
13.8 Psia
71.7 ~F
-13.3 ~F
85.0 ~F

= 2.0 ~F

Motor Run
% Full Load Amps
Phase A Voltage
Phase B Voltage
Phase C Voltage
Phase A Current
Phase B Current
Phase C Current

=
=
=
=
=
=
=
=

On
94 %
447 V
409 V
442 V
193 A
204 A
190 A

[Skip the following section if Motor Type is not Mod B
SSS]
Liquid-Cooled Solid State Starter

------------------------------------------------------------------------Compressor

------------------------------------------------------------------------Discharge Temperature
Vent Line Solenoid

= 121.6 ~F
= On

Oil Sump

------------------------------------------------------------------------Oil Pump Run Output
Oil Pressure
Oil Sump Temperature

= On
= 30.7 Psid
= 137.9 ~F

Motor Run
% Full Load Amps
Starter Model
KW Hours
Input Power
Phase A Voltage
Phase B Voltage
Phase C Voltage
Phase A Current
Phase B Current

=
=
=
=
=
=
=
=
=
=

On
94 %
33L
20723 KWH
145 KW
447 V
409 V
442 V
193 A
204 A

[Skip the following section if Hot Gas Bypass is not
enabled]
Hot Gas

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

FIG. 44 – SAMPLE PRINTOUT (STATUS)
116

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Phase
Phase
Phase
Phase

C
A
B
C

Current
Temperature
Temperature
Temperature

=
=
=
=

190 A
88 ~F
89 ~F
75 ~F

[Skip the following section if Motor Type is not VSD]
Variable Speed Drive

------------------------------------------------------------------------Motor Run = On
% Full Load Amps = 94 %
Pre-Rotation Vanes Position
Full Load Amps
Precharge Relay Output
Trigger SCR Output
Water Pump Output
KW Hours
Input Power
Output Frequency
Output Voltage
DC Bus Voltage
DC Inverter Link Current
Phase A Output Current
Phase B Output Current
Phase C Output Current
Internal Ambient Temperature
Converter Heatsink Temperature
Phase A Heatsink Temperature
Phase B Heatsink Temperature
Phase C Heatsink Temperature

=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=

75 %
402 A
Off
On
On
14528 KWH
150 KW
60 Hz
800 V
600 V
300 A
195 A
198 A
193 A
88 ~F
102 ~F
93 ~F
99 ~F
97 ~F

[Skip the following section if Motor Type is not VSD,
or Filter
is not present]
Harmonic Filter Data

------------------------------------------------------------------------Precharge Contactor
Supply Contactor
Operating Mode
Phase Rotation
Total Supply KVA
Total Power Factor
DC Bus Voltage
Heatsink Temperature
Voltage Peak N-L1
Voltage Peak N-L2
Voltage Peak N-L3
L1-L2 RMS Voltage
L2-L3 RMS Voltage
L3-L1 RMS Voltage
L1 RMS Filter Current
L2 RMS Filter Current
L3 RMS Filter Current
L1 RMS Supply Current
L2 RMS Supply Current
L3 RMS Supply Current
L1 Voltage Total Harmonic Distortion

=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=

Off
On
Running
ABC
148 KVA
0.97
608 V
102 ~F
200 V
200 V
200 V
215 V
215 V
215 V
150 A
150 A
150 A
152 A
152 A
152 A
1.5 %

FIG. 44 – CONTINUED
YORK INTERNATIONAL

117

Printers
FORM 160.55-O1 (604)

YORK SETPOINTS
CHILLER ID
0
-------------------------------------------------------------------------

------------------------------------------------------------------------Controls
= C.MLM.02.03.102
BIOS
=
C.MLM.00.03
Kernel
=
0.18
GUI
=
0.25
SIO
=
0.21
GPIC
=
0.03
Ext I/O [Skip if Hot Gas Disabled]
=
19962021101
VSD [Skip if Motor Type is not VSD]
=
C.VSD.01.14
SSS [Skip if Motor Type is not Serial SSS] =
C.SSS.01.01

Leaving Chilled Local Setpoint
Leaving Chilled ISN Setpoint
Leaving Chilled Modem Setpoint
Leaving Chilled Analog Setpoint
Leaving Chilled Digital Setpoint
Remote Range
Sensitivity
Restart Offset
Restart Setpoint
Shutdown Offset
Shutdown Setpoint
Brine Low Evaporator Cutout
Smart Freeze
Refrigerant

=
=
=
=
=
=
=
=
=
=
=
=
=
=

45.0 ~F
45.0 ~F
45.0 ~F
45.0 ~F
45.0 ~F
10.0 ~F
Normal
0.0 ~F
45.0 ~F
4.0 ~F
41.0 ~F
5.0 Psia
Off
Disabled

Condenser

------------------------------------------------------------------------High Pressure Warning Threshold
Drop Leg

=
=

28.8Psia
Disabled

[Skip the following section if Hot Gas Bypass is not
enabled]
Hot Gas

------------------------------------------------------------------------System Information

------------------------------------------------------------------------System Language
Data Display Mode
Control Source
Remote Analog Input Range
Clock

=
=
=
=
=

English
English
Local
0–10Volts
Enabled

Hot Gas
Hold Period
Close Percentage
Minimum Load
Maximum Open

=
=
=
=
=

Disabled
30 Min
5 %
1 ~F
80 %

Surge

------------------------------------------------------------------------Jumper Settings

------------------------------------------------------------------------Pre-Run
Coastdown
Chilled Liquid Pump Operation
Refrigerant Selection
Anti-Recycle
Power Failure Restart
Liquid Type
Motor Type
Printer Setup

=
=
=
=
=
=
=
=

Standard
Standard
Standard
R11
Enabled
Auto
Water
LCSSS

------------------------------------------------------------------------Automatic Printer Logging
Log Start Time
Output Interval
Printer Type
Baud
Data Bits
Parity
Stop Bits
COM 2 Setup

=
=
=
=
=
=
=
=

Disabled
12:00 am
60 Min
Okidata
9600 Baud
8 Bits
None
1 Bit

=
=
=
=

19200Baud
8 Bits
Odd
1 Bit

Evaporator

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

=
=
=
=
=

0.3
Enabled
Disabled
15
5 Min

[Skip the following section if Liquid Level is not
enabled]
Refrigerant Level Control

------------------------------------------------------------------------Level Control
Setpoint
Period
Proportion Limit Open
Proportion Limit Close
Rate Limit Open
Rate Limit Close

=
=
=
=
=
=
=

On
50 %
3.5 Sec
15 %
45 %
10 %
10 %

Purge Control

------------------------------------------------------------------------Hi Efficiency
Maximum Purges / Hour

------------------------------------------------------------------------Baud
Data Bits
Parity
Stop Bits

Surge Sensitivity
Shutdown
Extended Run
Count Limit
Count Window

=
=

Off
20

[Skip the following section if Motor Type is not EM]
Electro-Mechanical Starter

------------------------------------------------------------------------Local Motor Current Limit
Remote ISN Current Limit
Remote Analog Current Limit
Remote Digital Current Limit

=
=
=
=

100
100
100
100

%
%
%
%

FIG. 45 – SAMPLE PRINTOUT (SETPOINT REPORT)
118

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Remote Modem Current Limit
Pulldown Demand Limit
Pulldown Demand Time

=
=
=

100 %
100 %
0 Min

YORK SCHEDULE
CHILLER ID 0
© 1997 - 1999 YORK international corporation

[Skip the following section if Motor Type is not Mod A
SSS]
Liquid-Cooled Solid State Starter

mon 21 jun 1999

1:28:25 pm

schedule

= OFF

------------------------------------------------------------------------Local Motor Current Limit
Remote ISN Current Limit
Remote Analog Current Limit
Remote Digital Current Limit
Remote Modem Current Limit
Pulldown Demand Limit
Pulldown Demand Time
Scale/Model
Supply Voltage Range = Disabled
Full Load Amps = 150 A
Current Imbalance Check = Disabled

=
=
=
=
=
=
=
=

100 %
100 %
100 %
100 %
100 %
100 %
0 Min
600V,281A

Standard Schedule

--------------------------------------------------------------------------Sun

StarT

Off

Stop

Off

MOn

Start

06:00 AM

Stop

06:00 PM

Tue

Start

06:00 AM

Stop

06:00 PM

Wed

Start

06:00 AM

Stop

06:00 PM

Th u

Start

06:00 AM

Stop

06:00 PM

Fri

Start

06:00 AM

Stop

06:00 PM

Sat

Start

Off

Stop

Off

[Skip the following section if Motor Type is not Mod B
SSS]
Liquid-Cooled Solid State Starter

Exception Days

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

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

Local Motor Current Limit
=
100 %
Remote ISN Current Limit
=
100 %
Remote Analog Current Limit
=
100 %
Remote Digital Current Limit
=
100 %
Remote Modem Current Limit
=
100 %
Pulldown Demand Limit
=
100 %
Pulldown Demand Time
=
0 Min
Starter Model
=
33L
Voltage Range
=
Disabled
Full Load Amps
=
215 A
Starting Current
=
1460 A
Open SCR
=
Disabled
[Skip the following section if Motor Type is not VSD]
Variable Speed Drive

=
=
=
=
=
=
=
=
=

15 jul 1999

start

= 08:00 am

stop

08:00 pm

16 jul 1999

start

= 08:00 am

stop

08:00 pm

17 jul 1999

start

= 08:00 am

stop

08:00 pm

18 jul 1999

start

= 08:00 am

stop

08:00 pm

FIG. 46 – SAMPLE PRINTOUT
(SCHEDULE REPORT)

100 %
100 %
100 %
100 %
100 %
100 %
0 Min
351 HP
60 Hz

[Skip the following section if Motor Type is not VSD]
Harmonic Filter Data

------------------------------------------------------------------------Filter Operation
Motor HP

=
=

Enabled
351 HP

FIG. 45 – CONTINUED

YORK INTERNATIONAL

119

Printers
FORM 160.55-O1 (604)

Nameplate Information

YORK SALES ORDER
CHILLER ID
0

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

Motor Code

Power (Volts)

460

Phases

Frequency (Hz)

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

Looked Rotor Amps

4400

Commissioning date

Full Load Amps

642

Job Name

Inrush Amps

655

Mon 21 jun 1999 1:28:46 PM

Order Information

Job Location
Model Number

YTFBFAH6-CVJ

System Information

YORK Order Number

99102014-01

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

Panel Serial Number

12345678

Chiller Serial Number

12345678

Design Load - Evaporator

Refrigerant

R123

Tons

150

Gear Code

Liquid Type

water

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

Brine Percent

Passes

Kilowatts Input

467

Design Working Pressure

150

VSD / sss / em

VSD

Fouling Factor

0.00010

Pressure Drop

21.1

Nozzle Arrangement In

Nozzle Arrangement Out

Leaving Temperature

44.0

Return Temperature

56.0

GPM

1500.0

Tubes

181

Design Load - condenser

--------------------------------------------------------------------------Passes

Design Working Pressure

150

Fouling Factor

0.00025

Pressure Drop

28.0

Nozzle Arrangement In

Nozzle Arrangement Out
Leaving Temperature

94.3

Return Temperature

85.0

GPM

2250.0

Tubes

230

FIG. 47 – SAMPLE PRINTOUT (SALES ORDER REPORT)
120

YORK INTERNATIONAL

FORM 160.55-O1 (604)

YORK HISTORY 1
CHILLER ID
0
---------------------------------------------------------------------------

© 1997 - 1999 YORK INTERNATIONAL CORPORATION
MSYSTEM READY TO START
LCSSS – LOGIC BOARD POWER SUPPLY
[List any warnings that were active at the time of
shutdown]
Controls C.MLM.02.03.102
Run Time 0 Days 2 Hr 59 Min
Operating Hours
Number Of Starts
Control Source

= 0 %
= 0 %

--------------------------------------------------------------------------Total Surge Count
Surge Window Time
Surge Window Count

= 127
= 1 Min
= 0

[Skip the following section if Liquid Level is not
enabled]
Refrigerant Level Control

--------------------------------------------------------------------------= 294 Hr
= 105
= Local

Refrigerant Level Position
Ramp Up Time Remaining
[If Ramp Up in effect]

= 35 %
= 15 Sec

Purge Control

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

Evaporator

--------------------------------------------------------------------------Leaving Chilled Active Setpoint
Chilled Liquid Pump
Chilled Liquid Flow Switch
Leaving Chilled Liquid Temperature
Return Chilled Liquid Temperature
Evaporator Pressure
Evaporator Saturation Temperature
Evaporator Refrigerant Temperature
[If Refrigerant Sensor enabled]
Small Temperature Difference

Valve Position [If Hot Gas enabled]
Pre-Rotation Vanes Position
Surge

=
=
=
=
=
=
=
=

45.0 ~F
Stop
Open
50.0 ~F
59.3 ~F
7.2 Psia
41.1 ~F
40.0 ~F

= 10.0 ~F

Condenser

Pressure
Exhaust Count
Exhaust Window

= 42.8 Psia
= 0
= 60 Min

[Skip the following section if Motor Type is not EM]
Electro-Mechanical Starter

--------------------------------------------------------------------------Motor Run
% Full Load Amps

= Off
= 0 %

[Skip the following section if Motor Type is not Mod A
SSS]
Liquid-Cooled Solid State Starter

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

Condenser Liquid Pump
Condenser Liquid Flow Switch
Leaving Condenser Liquid Temperature
Return Condenser Liquid Temperature
Condenser Pressure
Condenser Saturation Temperature
Small Temperature Difference
Drop Leg Refrigerant Temperature
[If Drop Leg Sensor enabled]
Sub Cooling Temperature
[If Drop Leg Sensor enabled]

Motor Run
% Full Load Amps
Phase A Voltage
Phase B Voltage
Phase C Voltage
Phase A Current
Phase B Current
Phase C Current

=
=
=
=
=
=
=
=

Stop
Open
85.0 ~F
94.9 ~F
13.8 Psia
71.7 ~F
-13.3 ~F
85.0 ~F

= 2.0 ~F

Compressor

= 121.6 ~F
= Off

Oil Sump

--------------------------------------------------------------------------Oil Pump Run Output
Oil Pressure
Oil Sump Temperature

Off
0 %
447 V
409 V
442 V
0 A
0 A
0 A

[Skip the following section if Motor Type is not Mod B
SSS]
Liquid-Cooled Solid State Starter

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

--------------------------------------------------------------------------Discharge Temperature
Vent Line Solenoid

=
=
=
=
=
=
=
=

= Off
= 0.0 Psid
= 137.9 ~F

Motor Run
% Full Load Amps
Starter Model
KW Hours
Input Power
Phase A Voltage
Phase B Voltage
Phase C Voltage
Phase A Current
Phase B Current

=
=
=
=
=
=
=
=
=
=

Off
0 %
33L
20723 KWH
145 KW
447 V
409 V
442 V
0 A
0 A

[Skip the following section if Hot Gas Bypass is not
enabled]
Hot Gas

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

FIG. 48 – SAMPLE PRINTOUT (HISTORY REPORT)
YORK INTERNATIONAL

121

Printers
FORM 160.55-O1 (604)

[Skip the following section if Motor Type is not VSD]
Variable Speed Drive

-------------------------------------------------------------------------Motor Run
% Full Load Amps
Pre-Rotation Vanes Position
Full Load Amps
Precharge Relay Output
Trigger SCR Output
Water Pump Output
KW Hours
Input Power
Output Frequency
Output Voltage
DC Bus Voltage
DC Inverter Link Current
Phase A Output Current
Phase B Output Current
Phase C Output Current
Internal Ambient Temperature
Converter Heatsink Temperature
Phase A Heatsink Temperature
Phase B Heatsink Temperature
Phase C Heatsink Temperature

=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=

Off
0 %
0 %
402 A
Off
Off
Off
14528 KWH
150 KW
0 Hz
800 V
600 V
300 A
0 A
0 A
0 A
88 ~F
102 ~F
93 ~F
99 ~F
97 ~F

[Skip the following section if Motor Type is not VSD,
or
Filter is not
present]
Harmonic Filter Data

-------------------------------------------------------------------------Precharge Contactor
=
Supply Contactor
=
Operating Mode
=
Phase Rotation
=
Total Supply KVA
=
Total Power Factor
=
DC Bus Voltage
=
Heatsink Temperature
=
Voltage Peak N-L1
=
Voltage Peak N-L2
=
Voltage Peak N-L3
=
L1-L2 RMS Voltage
=
L2-L3 RMS Voltage
=
L3-L1 RMS Voltage
=
L1 RMS Filter Current
=
L2 RMS Filter Current
=
L3 RMS Filter Current
=
L1 RMS Supply Current
=
L2 RMS Supply Current
=
L3 RMS Supply Current
=
L1 Voltage Total Harmonic Distortion
=
L2 Voltage Total Harmonic Distortion
=
L3 Voltage Total Harmonic Distortion
=
L1 Supply Current Total Demand Distortion
L2 Supply Current Total Demand Distortion

Off
Off
Stopped
ABC
148 KVA
0.97
608 V
102 ~F
200 V
200 V
200 V
215 V
215 V
215 V
150 A
150 A
150 A
152 A
152 A
152 A
1.5 %
1.2 %
1.1 %
= 2.6 %
= 2.3 %

YORK SETPOINT CHANGE LOG
CHILLER ID 163
© 1997 – 2000 YORK INTERNATIONAL CORPORATION
Mon 09 Oct 2000 3:33:47 PM
Log Entry 1 Evaporator - Leaving Chilled Local Setpoint

--------------------------------------------------------------------------Date
Time
Access Level
User Id
Old Value
New Value

=
=
=
=
=
=

05 Oct 2001
4:23:49 PM
Service
4268
46.5 ~F
48.0 ~F

Log Entry 2 Condenser - High Pressure Warning Threshold

--------------------------------------------------------------------------Date
Time
Access Level
User Id
Old Value
New Value

=
=
=
=
=
=

05 Oct 2001
1:36:12 PM
Service
4268
162.5 Psig
225.0 Psig

Log Entry 3 Condenser - Drop Leg

--------------------------------------------------------------------------Date
Time
Access Level
User Id
Old Value
New Value

=
=
=
=
=
=

05 Oct 2001
1:36:02 PM
Service
4268
Disabled
Enabled

Log Entry 4 Evaporator - Refrigerant

--------------------------------------------------------------------------Date
Time
Access Level
User Id
Old Value
New Value

=
=
=
=
=
=

05 Oct 2001
1:35:48 PM
Service
4268
Disabled
Enabled

FIG. 49 – SAMPLE PRINTOUT (SECURITY LOG)

FIG. 48 – CONTINUED

122

YORK INTERNATIONAL

FORM 160.55-O1 (604)

YORK TREND
CHILLER ID 163

YORK CUSTOM VIEW
CHILLER ID 0
(c) 1997 – 2001 YORK INTERNATIONAL CORPORATION

Mon 21 Jun 1999 1:28:25 PM

Mon 09 Oct 2000 3:33:47 PM

Data 1: Leaving Chilled Liquid Temperature
Data 2: Return Chilled Liquid Temperature
Data 3: Evaporator Pressure
Data 4: Leaving Condenser Liquid Temperature
Data 5: Return Condenser Liquid Temperature
Data 6: Condenser Pressure

Time

Data 1

Data 2

Data 3

Data 4

Data 5 Data 6

3:33:47 PM45.5 °F55.0 °F 6.3 PSIA 95.0 °F 85.0 °F
PSIA

18.7

3:33:48 PM45.5 °F55.0 °F 6.3 PSIA 95.0 °F 85.0 °F
PSIA

18.7

3:33:49 PM45.5 °F55.0 °F 6.3 PSIA 95.0 °F 85.0 °F
PSIA

18.7

FIG. 50 – SAMPLE PRINTOUT (TREND DATA NEW
OR EXISTING POINTS)

Leaving Chilled Liquid Temperature
Return Chilled Liquid Temperature
Leaving Condenser Liquid Temperature
Return Condenser Liquid Temperature
Evaporator Saturation Temperature
Condenser Saturation Temperature
Evaporator Pressure
Condenser Pressure
Oil Pressure
% Full Load Amps

=
=
=
=
=
=
=
=
=
=

45.0
55.0
95.0
85.0
41.0
78.5
17.0
64.0
45.0
50 %

~F
~F
~F
~F
~F
~F
Psid
Psid
Psid

FIG. 51 – SAMPLE PRINTOUT
(CUSTOM SCREEN REPORT))

Log Time: Mon 12:45:39 PM 21 Jun 1999
D-P/P= 0.92; Prv Pos= 56; Freq= 39 Hz
Surge Type
Leaving Chilled Active Setpoint
Leaving Chilled Liquid Temperature
Return Chilled Liquid Temperature
Leaving Condenser Liquid Temperature
Return Condenser Liquid Temperature
Evaporator Pressure
Condenser Pressure
% Full Load Amps

=
=
=
=
=
=
=
=
=

Delta P/P Surge
45.0 ~F
50.0 ~F
59.3 ~F
85.0 ~F
94.9 ~F
7.2 Psia
13.8 Psia
94 %

FIG. 52 – SAMPLE PRINTOUT
(ADAPTIVE CAPACITY CONTROL
NEW MAP POINT REPORT)

D-P/P
D-P/P
D-P/P
D-P/P
D-P/P
D-P/P
D-P/P
D-P/P

=
=
=
=
=
=
=
=

1.20;
1.41;
0.98;
0.71;
0.86;
1.14;
0.84;
0.99;

Prv
Prv
Prv
Prv
Prv
Prv
Prv
Prv

Pos
Pos
Pos
Pos
Pos
Pos
Pos
Pos

=
=
=
=
=
=
=
=

89;
71;
73;
86;
53;
76;
84;
63;

Freq
Freq
Freq
Freq
Freq
Freq
Freq
Freq

=
=
=
=
=
=
=
=

58
46
52
39
48
51
37
46

Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz

FIG. 53 – SAMPLE PRINTOUT
(ADAPTIVE CAPACITY CONTROL EXISTING
MAP POINTS REPORT)

YORK INTERNATIONAL

123

System Operating Procedures
FORM 160.55-O1 (604)

SECTION 4
SYSTEM OPERATING PROCEDURES
OIL HEATERS

If the oil heater is de-energized during a shutdown period, it must be
energized for 12 hours prior to starting compressor, or remove all oil
and recharge compressor with new
oil. (See “Oil Charging Procedure”,
page 129.)
The oil heater is thermostatically
controlled and remains energized as
long as the fused disconnect switch
to the starter or Variable Speed Drive
is energized.

START-UP PROCEDURE

Pre-Starting
Prior to starting the chiller observe the OptiView Control Center. Make sure the Display reads “SYSTEM
READY TO START”.
To pre-start the chiller use the following procedure:
1. OIL HEATER - The oil heater must be energized
for 12 hours prior to starting the chiller. The unit will
not start if the oil is less than 71°F. If not possible the
compressor oil should be drained and new oil must
be charged into the oil sump. (See “Oil Charging
Procedure”, page 129)
2. OIL PUMP - To check, press and release the “MANUAL OIL PUMP” key under “Service” on the Control Center. The oil pump will run for 10 minutes and
shut down. Press and release the “MANUAL OIL
PUMP” key to stop the operation of the oil pump
for less than 10 minutes of operation.
3. All Control Center setpoints should be programmed
before the chiller is started. Prior to start, the clock
must be programmed for the proper day and time.
Any setpoints which are desired to be changed may
be programmed. If not programmed the “default”
value setpoints are as follows:

124

CHECKING THE OIL LEVEL
IN THE OIL RESERVOIR

Proper operating oil level – the middle of the upper
sight glass.
If the oil is excessively high after start-up, the excess
oil may be drained from the oil Þlter drain valve while
the compressor is running.
If oil level is low, oil should be added to the compressor. (See “Oil Charging Procedure”, page 129.)

Comply with EPA and Local regulations when removing or disposing
of Refrigeration System oil!

LCWT = 45°F
% Current Limit = 100% FLA
Pulldown Demand = None
Clock = Sun 12:00A.M.
Daily Schedule = None
Holiday = None
Remote Reset Temp. Range = 20°F
Data Logger = No Operation
Start-Up
1. If the chilled water pump is manually operated,
start the pump. The Control Center will not allow
the chiller to start unless chilled liquid ßow is established through the unit. (A Þeld supplied chilled
water ßow switch is required.) If the chilled liquid
pump is wired to the OptiView Control Center the
pump will automatically start, therefore, this step is
not necessary.
2. To start the chiller, press the “COMPRESSOR
START” switch. This switch will automatically
spring return to the “RUN” position. (If the unit
was previously started press the “STOP/RESET”
side of the “COMPRESSOR” switch and then press
the “START” side of the switch to start the chiller.)
When the start switch is energized the Control Center
is placed in an operating mode and any malfunction
will be noted by messages on the OptiView Control
Center. (See Fig. 3)

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Any malfunctions which occur during
“STOP/ RESET” are also displayed.

Variable Speed Drive) to decrease chiller capacity. When
the chilled liquid temperature rises, the actuator will open
the prerotation vanes and increase the compressor motor
speed of the chiller (if controlled by the Variable Speed
Drive), to increase the capacity of the unit.

When the chiller is shut down, the prerotation vanes
will close automatically to prevent loading the compressor on start-up. When the chiller starts to operate,
the following automatic sequences are initiated: (Refer to Fig. 54 & 55, “Operation Sequence Timing
Diagram”.)

However, the current draw (amperes) by the compressor
motor cannot exceed the setting of the “% CURRENT
LIMIT” at any time during the unit operation, since the
Graphic Control Center 30 to 100% three phase peak
current limit software function, plus the 3 phase 100%
solid state overload current limiter (CM-2) on ElectroMechanical Starter applications or the solid state starter
current limit function will override the temperature control function (or the logic section of the Variable Speed
Drive) and prevent the prerotation vanes from opening
beyond the “% CURRENT LIMIT” setting.

1. The OptiView Control Center display message
will read “SYSTEM PRELUBE” for the Þ rst
30 seconds of the starting sequence. (3 min. if
Microboard Pro gram Switch SW1-3 is “ON”;
“OFF” = 30 seconds.)
2. The compressor vent line solenoid valve will open
after the Þrst 5 minutes of unit operation. The solenoid will close automatically after the compressor
shuts down.
3. The 1R-1 contacts of the 1R start relay will remain
open for the Þrst 30 seconds of oil pump operation.
These contacts will close, starting the compressor
motor and the condenser water pump at the end of
the 30 second period.
4. The chilled liquid pump contacts will close, starting
the chilled liquid pump to allow liquid ßow through
the cooler when the “COMPRESSOR” start switch
is energized.
5. After the Þrst 30 seconds of operation, the compressor will start and the Graphic Control Center
display message will read “SYSTEM RUN”.

If the load continues to decrease, after the prerotation
vanes are entirely closed, the chiller will be shut down
by the Low Water Temperature control (LWT) function
which is displayed on the Control Center as: “LEAVING
CHILLED LIQUID – LOW TEMPERATURE”.
This occurs when the leaving water temperature falls
to programmed shutdown setpoint or 36°F, whichever
is higher.

If the temperature setpoint has been
reprogrammed within the last 10 minutes, the LWT cutout is 36°F for 10
minutes.
Condenser Water Temperature Control

Chiller Operation
After the compressor reaches its operating speed the
prerotation vanes will begin to open under the control
of the micro processor board or the logic section of the
Variable Speed Drive which senses the leaving chilled
liquid temperature. The unit capacity will vary to maintain the leaving chilled liquid temperature setpoint. The
prerotation vanes are modulated by an actuator under
the control of the microprocessor board or logic section
of the Variable Speed Drive. The vane control routine
employs proportional plus derivative (rate) control action. A drop in chilled liquid temperature will cause
the actuator to close the prerotation vanes (and also
decreases the speed of the motor if equipped with a

YORK INTERNATIONAL

The YORK Millennium chiller is designed to use
less power by taking advantage of lower than design
temperatures that are naturally produced by cooling
towers throughout the operating year. Exact control of
condenser water, such as a cooling tower bypass, is not
necessary for most installations. The chiller requires only
that the minimum condenser water temperature be no
lower than the value determined by referring to Fig. 56.
At start-up the entering condenser water temperature may
be as much as 25°F colder than the standby return chilled
water temperature. Cooling tower fan cycling will normally provide adequate control of the entering condenser
water temperature on most installations.

125

System Operating Procedures
FORM 160.55-O1 (604)

DISPLAY
MESSAGE
"SYSTEM RUN"

ENERGIZE
(OPEN)
VENT LINE
SOLENOID

"SYSTEM PRELUBE"
(OIL PUMP PRE-RUN)

"SYSTEM COASTDOWN"
(OIL PUMP POST-RUN)
CHECK
OIL PRESS.
"SYSTEM SHUTDOWN"
150 SEC.
(2.5 MIN.)

0
START

25
(0.4)

30
(0.5)

330
(5.5)

1800
(30)
RESTART

TIME IN SECONDS (MINUTES)
FIG. 54 – OPERATION SEQUENCE TIMING DIAGRAM
(ELECTRO-MECHANICAL AND SOLID STATE STARTER APPLICATIONS)

LD04643

DISPLAY
MESSAGE
"SYSTEM RUN"

ENERGIZE
(OPEN)
VENT
SOLENOID

"SYSTEM PRELUBE"
(OIL PUMP PRE-RUN)

"SYSTEM COASTDOWN"
(OIL PUMP POST-RUN)
CHECK
OIL PRESS.
"SYSTEM SHUTDOWN"
150 SEC.
(2.5 MIN.)

0
START

25
(0.4)

30
(0.5)

330
(5.5)

TIME IN SECONDS (MINUTES)

1800
(30)
RESTART (IF
FIVE SUCCESSIVE
RESTARTS HAVE
NOT OCCURRED)

RESTART (ONLY
AFTER THE FIFTH
SUCCESSIVE RESTART)

LD04644

FIG. 55 – OPERATION SEQUENCE TIMING DIAGRAM
(COMPRESSOR MOTOR VARIABLE SPEED DRIVE APPLICATIONS)
126

YORK INTERNATIONAL

FORM 160.55-O1 (604)

CHECKING OPERATION

During operation, the following conditions should be
periodically checked:
1. On starting, the prerotation vanes should remain
closed.
2. Be sure the oil pump is operating while unit is running.
3. Check Oil Pressure display. A gradual decrease in
bearing oil pressure of 5 to 10 PSI (with constant
suction and discharge pressures) may be an indication of a dirty Þlter. The Þlter should be replaced
when pressure loss is 30% or more of the original
pressure. The actual bearing oil pressure will vary
with compressor suction and discharge pressures.
When a new system is Þrst operated under normal
full load conditions, the bearing oil pressure should
be recorded as a reference point with which to compare subsequent readings.
OPERATING LOG SHEET
LD00466

FIG. 56 – MINIMUM ENTERING CONDENSING
WATER TEMPERATURE

A permanent daily record of system operating conditions (temperatures and pressures) recorded at regular
intervals throughout each 24 hour operating period
should be kept.

LD00467

*NOTE:

23889A

These items can be printed by an electronic printer connected to the Microboard

and pressing the PRINT key on the Keypad or automatically using the Data Logger feature.

FIG. 57 – LIQUID CHILLER LOG SHEETS
YORK INTERNATIONAL

127

System Operating Procedures
FORM 160.55-O1 (604)

An optional status printer is available for this purpose;
or, Fig. 48 shows a log sheet used by YORK personnel
for recording test data on chillers. It is available from
the factory in pads of 50 sheets each under Form No.
160.44-F6 and may be obtained through the nearest
YORK ofÞce. Automatic data logging is possible by
connecting the optional printer and programming the
DATA LOGGER function.
An accurate record of readings serves as a valuable
reference for operating the system. Readings taken
when a system is newly installed will establish normal
conditions with which to compare later readings.
For example, dirty condenser tubes may be indicated
by higher than normal temperature differences between
leaving condenser water and refrigerant leaving the
condenser.
OPERATING INSPECTIONS

By following a regular inspection using the display readings of the OptiView Control Center, and maintenance
procedure, the operator will avoid serious operating difÞculty. The following list of inspections and procedures
should be used as a guide.
Daily
1. Check OptiView Control Center displays.
2. If the compressor is in operation, check the bearing oil pressure by pressing “OIL SUMP” key to
read the display on the Control Center. Also check
the oil level in the oil reservoir. Drain or add oil if
necessary.
3. Check entering and leaving condenser water pressure and temperatures for comparison with job design conditions. Condenser water temperatures can
be checked by pressing “CONDENSER” display
key.
4. Check the entering and leaving chilled liquid temperatures and evaporator pressure for comparison
with job design conditions. This can be accomplished
by pressing the “EVAPORATOR” key and the “REFRIGERANT PRESSURES” key.
5. Check the condenser saturation temperature (based
upon condenser pressure sensed by the condenser
transducer). Press the “CONDENSER” key.
6. Check the compressor discharge temperature. Press
“COMPRESSOR” key. During normal operation
discharge temperature should not exceed 220°F.
128

7. Check the compressor motor voltage and current
(amps) at E-M starter (or Variable Speed Drive), or
on the OptiView Control Center motor display for
Solid State Starter units.
8. Check for any signs of dirty or fouled condenser
tubes. (The temperature difference between water
leaving condenser and liquid refrigerant leaving the
condenser should not exceed the difference recorded
for a new unit by more than 4°F.)
9. Verify proper water treatment.
10. If the chiller is controlled by a YORK Variable Speed
Drive, check the operating lights on the logic section.
(Refer to 160.00-O1)
11. Monitor Graphic Display for Warning Messages.
Weekly
1.Check the refrigerant charge. (See “Checking the
Refrigerant Charge”, page 140)
Quarterly
1. Change the purge unit dehydrator at least quarterly,
or more often if required.
2. Clean purge foul gas strainer.
3. Perform chemical analysis of oil.
4. Clean water strainer on VSD (if equipped).
Semi-Annually (or more often as required.)
1. Change and inspect compressor oil Þlter element.
2. Oil return system
a. Change dehydrator.
b. Check nozzle of eductor for foreign particles.
3. Check controls and safety cutouts.
4. Check level of coolant if equipped with SSS or
VSD.
Annually (more often if necessary.)
1. Drain and replace the oil in the compressor oil sump
(See “Oil Charging Procedure”, page 129).
2. Cooler and Condenser
a. Inspect and clean water strainers.
b. Inspect and clean tubes as required.
c. Inspect end sheets.
d. Backßush heat exchanger on VSD (if equipped).
YORK INTERNATIONAL

FORM 160.55-O1 (604)

3. Compressor Drive Motor (See motor manufacturer’s
maintenance and service instruction supplied with
unit)
a.Clean air passages and windings per
manufacturer’s instructions.
b. Meg motor windings - See Fig. 65 for details.
c. Relubricate ball bearings.

CHECK VALVE

FLOAT SWITCH ASS’Y.

PUMP

Don’t overlook motor drive end bearing located in motor support of F1, F2
compressors.

4. Purge unit.
a. Clean and inspect all valves.
b. Drain and ßush purge shell.
c. Clean oriÞces.
5. Inspect and service elec tri cal com ponents as
necessary.
6. Perform chemical analysis of system.
Every Two Years
1. If unit is equipped with SSS or VSD, ßush cooling
circuit and replace with new coolant solution, YORK
Part # 013-02987-000.

4
FIG. 58 – TURBOGUARD PURGE UNIT

27046A(D)

The Turboguard purge unit includes a display message on the control center display. The message reads
“WARNING – EXCESS PURGE” if an excessive
air leak is present within the chiller. The “WARNING
RESET” should be pushed with the OptiView Control
Center in “SERVICE” mode to reset the display. Leak
check and correct the leak if the display continues to
show this message.

NEED FOR PURGING THE SYSTEM

NORMAL AND SAFETY SYSTEM SHUTDOWNS

To assure satisfactory operation, it is important that these
systems be kept free of moisture laden air and noncondensible gases. Air in the system usually collects in the
condenser, blanketing some of the condensing surface,
causing the discharge pressure and temperature to rise,
resulting in high operating cost, and possibly surging, or
shutdown of system by high pressure cutout. Moisture
in the system causes acid formation which is destructive
to internal system parts.

Normal and safety system shutdowns have been built
into the chiller to protect it from damage during certain
operating conditions. Therefore, it should be understood
that at certain pressures and temperatures the system will
be stopped automatically by controls that respond to high
temperatures, low temperatures, and low and high pressures, etc. The “Display Messages” section is an explanation of each speciÞc shutdown. If the chiller shuts down
on a “Safety” shutdown the cause is displayed.

A Turboguard purge unit is furnished and mounted at the
rear of the system (See Fig. 58). The purpose of this unit
is to automatically remove the mixture of noncondensible gases and refrigerant from the top of the condenser,
expel the noncondensibles to the atmosphere and return
the refrigerant to the system.

STOPPING THE SYSTEM

IMPORTANT!
The purge unit operates continuously
when the system is in operation.

YORK INTERNATIONAL

The OptiView Control Center can be programmed to start
and stop automatically (maximum, once each day) whenever desired. To stop the chiller proceed as follows:
1. Push the compressor switch to “STOP/RESET”. The
OptiView Control Center display will show “SYSTEM COASTDOWN” for 150 seconds (6 min. if
Microboard jumper JP36 removed). The compressor,
129

System Operating Procedures
FORM 160.55-O1 (604)

condenser water, and cooling tower fans will stop
automatically. The oil pump will continue to run
for a period of 150 seconds. The oil pump will then
stop automatically. Once stopped, the “SYSTEM
COASTDOWN” display will be replaced by “SYSTEM READY TO START”.
2. Stop the chilled water pump (if not wired into the
OptiView Control Center, in which case it will
shut off automatically simultaneously with the oil
pump.) (The actual water pump contact operation is
dependent upon the position of Microboard Program
Switch SW1-8.)
3. Open the switch to the cooling tower fan motors, if
used.
4. The compressor sump oil heater (thermostatically
controlled) is energized when the unit is stopped.
PROLONGED SHUTDOWN

If the chiller is to be shut down for an extended period of
time (for example, over the winter season), the following
paragraphs outline the procedure to be followed.
1. After the system pressure has risen above atmospheric, test all system joints for refrigerant leaks
with a leak detector. If equipment room is below
70°F, circulate hot water (not to exceed 100°F)
through the cooler tubes to raise the system pressure. If any leaks are found, they should be repaired
before allowing the system to stand for a long period
of time.
During long idle periods, the tightness of the system
should be checked periodically.

130

2. If freezing temperatures are encountered while the
system is idle, carefully drain the cooling water from
the cooling tower, condenser, condenser pump, and
the chilled water system-chilled water pump and
coils. Open the drains on the cooler and condenser
liquid heads to assure complete drainage. (If a Variable Speed Drive, drain its water cooling system. If
Solid State Starter, drain water from starter cooling
loop. Isolate the Turboguard purge unit from the
main system.)
3. Isolate the Turboguard purge unit from the main
system.
4. Disable clock on SETUP Screen. This conserves the
battery.
5. Open the main disconnect switches to the compressor
motor, condenser water pump and the chilled water
pump. Open the 115 volt circuit to the Control Center.
START UP AFTER PROLONGED SHUTDOWN

1. When putting the system into operation after prolonged shutdown (during the winter), remove all
oil from the compressor. Install a new Þlter element
and charge compressor with fresh oil. Replace purge
unit and oil return Þlters. Enable clock on SETUP
Screen.
2. Operate the “OIL PUMP” (press and release the
manual oil pump key) until steady oil pressure is established. Then press and release the “OIL PUMP”
key to stop operation of the oil pump. If the water
systems were drained, Þll the condenser water circuit
and chilled liquid circuit.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

SECTION 5
SYSTEM COMPONENTS DESCRIPTION COMPRESSOR / MOTOR ASSEMBLY
CASING - The casing is accessible with vertical circular
joints and fabricated of close-grain cast iron. The motor
assembly is completely removable from the compressor
rotor and scroll assembly. Compressor castings are designed for 15 PSIG working pressure and hydrostatically
pressure tested at 50 PSIG.
COMPRESSOR - The rotor assembly consists of a
heat treated alloy steel drive shaft (integral with pinion
gear) and a lightweight, high strength, fully shrouded
cast aluminum impeller. The impeller is designed for
balanced thrust. The impeller is dynamically balanced
to insure vibration free operation and is overspeed tested
for safety.
BEARINGS - Insert type journal and thrust bearings
are fabricated of aluminum alloy and are precision bored
and axially grooved.
INTERNAL GEARS - Single he li cal gears with
crowned teeth are employed so that more than one tooth
is in contact at all times to provide even distribution of
the compressor load with quiet operation. Gears are integrally assembled in the compressor rotor support and are
oil Þlm lubricated. Each gear is individually mounted in
journal bearings with individual thrust bearings to insure
proper balance of forces from the impeller and motor.
LUBRICATION SYSTEM - YORK lubricating oil
is force fed to all bearings and Þltered by an externally mounted 15 micron replaceable cartridge oil
Þlter equipped with service valves. An automatic oil
recovery system returns oil to the compressor that has
migrated into the refrigerant system. Heat is removed
from the oil by a refrigerant-cooled oil cooler, located
in the evaporator. All oil piping is completely factoryinstalled and tested. A thermostatically controlled heater
is supplied in the oil reservoir to limit the amount of
refrigerant absorbed by the oil when the compressor is
not operating.
Oil (under pressure) is supplied from the oil reservoir by
an internally-mounted submersible oil pump. Oil Pump
motors are available in 208 through 600V-3Ph-60/50 Hz
to match the application and are supplied complete with
starter and current sensing overloads for extra protection.
The oil reservoir heater is 1000 watts, 115V-1Ph-60/50

YORK INTERNATIONAL

Hz immersion type. A separate three phase power supply is required except when ordered with a YORK Solid
State Starter or Variable Speed Drive. A gravity ßow oil
reservoir is provided to feed the bearings and gears during coast down in the event of a power failure.
CAPACITY REDUCTION - Prerotation vanes (PRV)
modulate the unit capacity from 100% to 10% of design,
on normal air conditioning jobs. The prerotation vanes
are airfoil-shaped and made of manganese bronze. An
external, electric PRV operator automatically controls
the vane position through a simple, reliable linkage.
SHAFT SEAL - The com pres sor drive shaft seal
consists of a spring-loaded, precision lapped carbon
ring, high temperature elastomer O-ring static seal, and
stress-relieved, precision lapped cast iron collar. The
seal features a small face area and low rubbing speed. It
provides an efÞcient seal under bothVacuum and pressure conditions. The seal is oil-ßooded at all times and
is pressure-lubricated during compressor operation.
OPEN MOTOR - The 3600 RPM open motor is a
drip-proof, squirrel cage, induction type constructed
to YORK design speciÞcations by nationally-known
manufacturers. Standard low voltage (208 through
600V-3Ph-60/50 Hz) motors are available for full-voltage (across-the-line) or reduced-voltage (solid state, star
delta or auto transformer) starting. Standard high voltage
(2300 through 4160V-3Ph60/50 Hz) motors are available
for full-voltage (across-the-line) or reduced-voltage (primary reactor or auto transformer) starting. Open close
coupled motors are built with a cast iron adapter ßanged
between the motor and compressor. This unique design
allows the motor to be coupled to the compressor.
MOTOR TERMINAL BOX - The casing is fabricated of heavy gauge steel. There are six terminals
(three for high voltage) in the terminal box. Provisions
are furnished for 208 through 600 volts for three-lead
types of starting (solid state, across-the-line, and auto
transformer). Motor terminal lugs are furnished with
the YORK Current Guard Starter and the Variable
Speed Drive mounted in the power section. Overload/
overcurrent transformers (CTs) are furnished as listed
below; in motor terminal box, as follows:

131

System Components Description
FORM 160.55-O1 (604)

FIG. 59 – SCHEMATIC DRAWING – (YT) COMPRESSOR LUBRICATION SYSTEM
132

LD03278

YORK INTERNATIONAL

FORM 160.55-O1 (604)

Application #CT’s Furnished in Motor Terminal Box
E-M Starter
SS Starter
VS Drive

3
0
0

COMPRESSOR LUBRICATION SYSTEM

The chiller lubrication system consists of the oil pump,
oil Þlter, oil cooler and all interconnecting oil piping
and passages. (See Fig. 59) There are seven main points
within the motor-compressor which must be supplied
with forced lubrication as follows:
1. Compressor Drive Shaft (Low Speed)
a. Shaft seal.
b. Front and rear journal bearings - one on each
side
of driving gear.
c. Low speed thrust bearing (forward and reverse).
2. Compressor Driven Shaft (High Speed)
a. Forward and reverse high speed thrust bearing.
b. Three journal bearings (YDTJ67 through 95 and
YDTL108 through 126). Two journal bearings
(YDTL131 and 144).
3. Speed Increasing Gears
a. Meshing surfaces of drive and pinion gear teeth.
To provide the required amount of oil under the necessary pressure to properly lubricate these parts, a motor
driven submersible oil pump is located in a remote oil
sump.
Upon press ing of the “COM PRES SOR START”
switch on the control center, the oil pump is immediately energized. After a 30 second delay to allow the
system oil pressure to stabilize, the compressor motor
will start. The oil pump will continue to run during the
entire operation of the compressor, and for 150 seconds
during compressor coastdown.
The submerged oil pump takes suction from the surrounding oil and discharges it to the oil cooler where heat
is rejected. The oil ßows from the oil cooler to the oil
Þlter. The oil leaves the Þlter and ßows to the emergency
oil reservoir where it is distributed to the compressor
bearings. The oil lubricates the compressor rotating
components and is returned to the oil sump.
Since the emergency oil reservoir is at the highest point
in the lubrication system, it provides an oil supply to
the various bearings and gears in the event of a system
shutdown due to power failure. The reservoir, located on
YORK INTERNATIONAL

the top of the compressor, allows the oil to be distributed
through the passages by gravity ßow, thus providing necessary lubrication during the compressor coastdown.
OIL PUMP

For normal operation the oil pump should operate at
all times during the chiller operation. Manual pump
operation may be used to establish stable oil pressure before starting. When depressed and released,
the “MANUAL OIL PUMP” key will operate the oil
pump for 10 minutes and then automatically shut off.
To stop the oil pump sooner, depress the “MANUAL
OIL PUMP” key again.
On shutdown of the system for any reason, the oil pump
operates and continues to run for 150 seconds. The system cannot restart during that time interval.
OIL HEATER

During long idle periods, the oil in the compressor oil
reservoir tends to absorb as much refrigerant as it can
hold, depending upon the temperature of the oil and
the pressure in the reservoir. As the oil temperature is
lowered, the amount of refrigerant absorbed will be increased. If the quantity of refrigerant in the oil becomes
excessive, violent oil foaming will result as the pressure
within the system is lowered on starting. This foaming is
caused by refrigerant boiling out of the oil as the pressure
is lowered. If this foam reaches the oil pump suction,
the bearing oil pressure will ßuctuate with possible
temporary loss of lubrication, causing the oil pressure
safety cutout to actuate and stop the system.
SHELLS - The cooler and condenser shells are rolled
carbon steel plate with fusion welded seams. A thick tube
sheet is welded to each end of the shell and is drilled
and reamed to accommodate the tubes. All shells have
a design working pressure of 15 PSIG and are pressuretested at 30 PSIG.
TUBES - Individually-replaceable, 3/4" O.D., integralÞnned copper heat exchanger tubes are used in the cooler
and condenser. The tubes are roller-expanded into the
tube sheets, providing a leak-proof seal.
COMPACT WATER BOXES - Removable water
boxes are fabricated of steel. The standard design
working pressure is 150 PSIG and the boxes are tested
at 225 PSIG. Integral steel water bafßes are located and
welded within the water box to provide required 1, 2,
or 3-pass arrangements. Water nozzle connections with
133

System Components Description
FORM 160.55-O1 (604)

Victaulic grooves are welded to the water boxes. These
nozzle connections are suitable for Victaulic couplings,
welding or ßanges (300 PSI has ßanges). 1/2" coupling
and separable well are located in the entering and leaving
chilled liquid nozzles for temperature sensing elements.
Plugged 1/2" or 3/4" drain and vent connections are
provided in each water box.
COOLER - The cooler is a horizontal, ßooded, shelland-tube type, with a distribution system consisting
of a distributor trough to give uniform distribution
throughout the shell length and a perforated distributor
plate, located under the entire tube bundle, to equally
distribute refrigerant. Intermediate steel tube supports
are spaced at intervals of less than four feet. Highly efÞcient, aluminum mesh eliminators are located above
the tube bundle to prevent liquid refrigerant carryover
into the compressor.
A liquid level sight glass is conveniently located on the
side of the cooler to aid in determining proper refrigerant charge.

REFRIGERANT FLOW CONTROL - The ßow control chamber is welded to the bottom of the condenser to
allow complete drainage of liquid refrigerant from the
condenser. The chamber contains a single Þxed-oriÞce
ßow control with no moving parts.
BURSTING DISC - A 2" or 3" frangible carbon bursting disc relief device is located in the compressor suction line.
SOLID STATE STARTER (OPTIONAL)

The Solid State Starter is a reduced-voltage liquid cooled
starter that controls and maintains a constant current
ßow to the motor during start-up. The starter is mounted
on the chiller. The power wiring from the starter to the
motor and from the starter control transformer to the
Control Center is factory wired and tested. Available
for 200-600V-3Ph-60/50 Hz power; 2 or 3 barrel lug
connections per phase are provided on the starter. The
starter enclosure is NEMA Type1 and is provided with
a hinged door with lock and key.
VARIABLE SPEED DRIVE (OPTIONAL)

CONDENSER - The condenser is a horizontal, shelland-tube type, with a discharge gas bafße to prevent direct high velocity impingement on the tubes. This bafße
is also used to distribute the refrigerant gas ßow properly
for most efÞcient heat transfer. A purge connection is
located in the condenser for efÞcient elimination of
noncondensibles. Intermediate steel tube supports are
spaced at intervals of less than four feet.

134

A 460V-3ph-60/50 Hz Variable Speed Drive can be factory packaged with the chiller. It is designed to vary the
compressor motor speed and prerotation vane position
by controlling the frequency and voltage of the electrical
power to the motor. Operational information is contained
in Form 160.00-O1. The control logic automatically
adjusts motor speed and compressor prerotation vane
position for maximum part load efÞciency by analyzing
information fed to it by sensors located throughout the
chiller.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

SECTION 6
OPERATIONAL MAINTENANCE
OIL RETURN SYSTEM

OIL RETURN

The oil return system continuously maintains the proper
oil level in the compressor oil sump. (See Fig. 57.)
High pressure condenser gas ßows continuously through
the eductor inducing the low pressure, oil rich liquid to
ßow from the evaporator, through the dehydrator to the
compressor sump.
CHANGING THE DEHYDRATOR

To change the dehydrator use the following procedure:
1. Shut the stop valves on the condenser gas line, oil
return line to rotor support and inlet end of dehydrator.

2. Remove the dehydrator as follows: Refer to Fig.
58.
a. Remove connection on the inlet end of dehydrator.
b. Place wrenches on the dehydrator outlet and inlet
ends and the ßare nut. Loosen the ßare nut and
unscrew the dehydrator.
3. Assemble the new Þlter-drier as follows:
a. Place the outlet and inlet ends of the dehydrator
between the ßare nuts.
b. Tighten the ßare nuts.
4. Open condenser stop valve and check dehydrator
connections for refrigerant leaks.
5. Open all the dehydrator stop valves to allow the liquid refrigerant to ßow through the dehydrator and
condenser-gas through the eductor.

LD00469

22621A(D)

FIG. 60 – OIL RETURN SYSTEM
YORK INTERNATIONAL

135

Operational Maintenance
FORM 160.55-O1 (604)

LD00470

FIG. 61 – ASSEMBLY OF DEHYDRATOR

136

YORK INTERNATIONAL

FORM 160.55-O1 (604)

CHARGING THE UNIT WITH OIL
The nominal oil charge for the compressor is: 10 gal. “B”
and “C” compressor; 15 gal. “E” and “F’ compressor.
New oil YORK Refrigeration Type “C” must be used in
the centrifugal compressor. Since oil absorbs moisture
when exposed to the atmosphere it should be kept tightly
capped until used.
OIL CHARGING PROCEDURE

The oil should be charged into the oil reservoir using the
YORK Oil Charging Pump - YORK Part No. 070-10654.
To charge oil into the oil reservoir proceed as follows:
1. The unit should be shut down.

If charging oil to restore the correct
lev el, the unit may be kept in operation.

2. Immerse the suction connection of the oil charging
pump in a clean container of new oil and connect
the pump discharge connection to the oil charging
valve (A) located on the remote oil reservoir cover
plate. (See Fig. 62). Do not tighten the connection

OIL CHARGING VALVE

25721A

at the charging valve until after the air is forced out
by pumping a few strokes of the oil pump. This Þlls
the lines with oil and prevents air from being pumped
into the system.
3. Open the oil charging valve and pump oil into the
system until oil level in the compressor oil reservoir
is about midway in the upper sight glass. Then,
close the charging valve and disconnect the hand
oil pump.
4. As soon as oil charging is complete, close the power
supply to the starter or Variable Speed Drive to energize the oil heater. This will keep the concentration
of refrigerant in the oil to a minimum.
When the oil reservoir is initially charged with oil, the
oil pump should manually be started to Þll the lines,
passages, oil cooler and oil Þlter. This will lower the
oil level in the reservoir. It will then be necessary to
add oil to bring the level back to the center of the upper
sight glass.

LD00472

FIG. 62 – CHARGING OIL RESERVOIR WITH OIL
YORK INTERNATIONAL

137

Troubleshooting
FORM 160.55-O1 (604)

SECTION 7
TROUBLE SHOOTING
TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE
CONTROL CENTER DISPLAY
SHUTDOWN CAUSE
CONTROL
CENTER DISPLAY
CONTROL CENTER
DISPLAY
METHOD OF
RESTART

OPERATING POINT
ON FALL

TIME
OF DAY

MON.

10:00 AM

Low Water
Temperature

Autostart

Low Water (LWT)

Chilled water
setpoint

4°F below chilled
water setpoint

MON.

10:00 AM

Low Water
Temperature VSD

Autostart

Low Water (LWT)

Chilled water
setpoint

4°F below chilled
water setpoint

MON.

10:00 AM

Flow Switch

Autostart

Flow Switch

MON.

10:00 AM

System Cycling

Autostart

A remote command
(computer relay contact or
manual switch)

MON.

10:00 AM

Multi-Unit Cycling

Autostart

(Optional)
Lead-Lag Sequence Control

MON.

10:00 AM

Internal Clock

Autostart

Internal Clock

MON.

10:00 AM

AC Undervoltage

Autostart

<15% FLA for 25
continuous seconds

MON.

10:00 AM

Power Fault

Autostart

CM-2 Current Module or
Solid State Starter

MON.

CAUSE OF
SHUTDOWN

GOVERNING CONTROL FUNCTION

DAY OF
WEEK

DESCRIPTION

Remote Stop

Energy Management System

Anti-Recycle,
20 Min. Left

Anti-Recycle
Timer

ON RISE

MON.

10:00 AM

Low Evap. Press.

Low Evap. Pressure
Transducer (LEP)

5.43 PSIA

5.42 PSIA

MON.

10:00 AM

Low Evap. Press.
Brine

LEP external control
(Brine units only)

Set to Job Spec.

MON.

10:00 AM

Low Oil
Pressure

Low Oil Press. Transducer (OP)
High Oil Press. Transducer (OP)

20 PSID

15 PSID

MON.

10:00 AM

High Pressure

High Pressure
Safety Control (HP)

15 PSIG

9 PSIG

MON.

10:00 AM

Evap. Transducer
or Probe Error

Evap. Pressure Transducer
or Leaving Chilled Water
Thermistor (RS1)

MON.

10:00 AM

Motor Controller Ext. Reset

CM-2 or Solid State Starter or
Variable Speed Drive

MON.

10:00 AM

High Discharge
Temperature

Discharge Temperature
Thermistor (RT2)

220°F

219°F

MON.

10:00 AM

High Oil
Temperature

Oil Temperature
Thermistor (RT3)

180°F

179°F

MON.

10:00 AM

Power
Failure

Microboard undervoltage
circuit on 5V unregulated
supply

8.29VDC

7.84VDC

MON.

10:00 AM

Power
Failure

Microboard undervoltage
circuit on 5V unregulated
supply

8.29VDC

7.84VDC

138

Autostart

YORK INTERNATIONAL

FORM 160.55-O1 (604)

TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE
CONTROL CENTER DISPLAY - CONTINUED
PROGRAMMED
SETPOINTS
BY OPERATOR

START-UP OF
SYSTEM AFTER
SHUTDOWN

PROBABLE CAUSE
AND SERVICE
REQUIRED

4°F below chilled water
setpoint (If set to 40°F would
be 36°F.) (36°F minimum)

Automatic Restart when water reaches setpoint.
If system is running and setpoint is increased
4°F, system will continue to run, as LWT cutout
shifts to a fixed 36°F for 10 minutes.

System load is less than minimum capacity.

4°F below chilled water
setpoint (If set to 40°F would
be 36°F.) (36°F minimum)

If system is running and setpoint is increased
4°, VSD will Initiate Shutdown. Automatic Restart
when water temperature reaches setpoint.

System load is less than minimum capacity.

Automatic Restart when water flow is restored to
close flow switch.

Lack of water flow.
Check operation of chilled water pump.

Automatic Restart upon remote command.

Contact - connected to the Remote/Local
cycling input of the Digital Input Board.

Automatic Restart upon remote command.

Contact - connected to the Multi-Unit
cycling input of the Digital Input Board.

Will automatically restart when programmed
schedule permits.

Pressing Compressor Start Switch
overrides the program.

Daily Schedule programmed
to shut down unit.

Cycling shutdown occurs when motor current is
>15% FLA for 25 seconds during chiller operation.
Will start automatically following coastdown.

Motor Controller contacts opening and closing in less
than 3 seconds due to a power fault condition.

Start up by start signal from remote start switch.

Remote Stop Contact Closure.

Will restart when time left = 00 minutes.

Minimum time between successive compressor
starts is 30 minutes.

To restart, press compressor switch from
STOP/RESET to START position.

See OPERATING ANALYSIS, Table 2
Symptom 2.

To restart, press compressor switch from
STOP/RESET to START position.

See OPERATING ANALYSIS, Table 2
Symptom 2.

Will restart when pressure increases to 20 PSID.
To restart, press compressor switch from
STOP/RESET to START position.

See OPERATING ANALYSIS, Table 2
Symptom 4, 5, 6, 7, 9, 10, 11.

Will restart when pressure falls to 9 PSIG.
To restart, press compressor switch from
STOP/RESET to START position.

See OPERATING ANALYSIS, Table 2
Symptom 1 - High Discharge Pressure.

To restart, press compressor switch from
STOP/RESET to START position.

Defective Evap. Pressure Transducer or Leaving
Chiller Water thermistor (RS1). LCWT minus
saturation temp. is less than -2.5°F or greater than
25°F. Checked every 10 minutes following a 10-min.
bypass at start-up.

Reset the device that caused the shutdown.
Chiller will start automatically.

CM-2 or Solid State Starter or Variable Speed
Drive has shut down chiller.

To restart, press compressor switch from
STOP/RESET to START position.

Condenser tubes dirty or scaled or high condenser
water temperature. See Symptom 1, Table 2.

To restart, press compressor switch from
STOP/RESET to START position.

Dirty oil filter or restricted oil cooler line. Change oil
filter. See Symptom 9, Table 2.

Optional AUTO Restart Plug
is installed on Microboard.

Will restart automatically when voltage reaches
8.29VDC. An undervoltage circuit on Microboard
monitors the 5VDC unregulated supply for an
undervoltage condition.

Power Failure.

Auto restart plug is removed
on Microboard.

To restart, press compressor switch to STOP/
RESET position and then to START position.

Power Failure.

Will not start until 30 minute
timer is timed out.

YORK INTERNATIONAL

139

Troubleshooting
FORM 160.55-O1 (604)

TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE
CONTROL CENTER DISPLAY - CONTINUED
SHUTDOWN CAUSE CONTROL CENTER DISPLAY
DAY OF
WEEK

TIME
OF DAY

MON.

10:00 AM

CAUSE OF
SHUTDOWN

METHOD OF
RESTART

Oil Pressure
Transducer Error
Vane Motor
Switch Open

MON.

10:00 AM

Starter
Malfunction
Detected

MON.

10:00 AM

Program Initiated
Reset

DESCRIPTION
High Oil Pressure
Transducer or Low
Oil Pressure Transducer

Autostart

GOVERNING CONTROL FUNCTION
OPERATING POINT
ON RISE
ON FALL
60 PSID

59 PSID

Oil Temperature
Thermistor (RT3)

71.0°F

55°F
29.9°F

Vane Motor Switch

Motor Current >15% for 10
seconds with Control Center
not calling for motor to run.
Autostart

Replace RTC-IC
Chip Reprogram
Setpoints

Microboard
RTC-IC Chip

MON.

10:00 AM

Low Oil
Temperature

MON.

10:00 AM

Faulty Discharge
Temperature
Sensor

Discharge Temp. Thermistor
(RT2) disconnected or faulty
(min. system operating
temp. = 32°F)

30.0°F

MON.

10:00 AM

Low Line Voltage
(SSS units only)

SSS Logic Board

See legend on
wiring diagram.

MON.

10:00 AM

Motor Phase
Current Unbalance
(SSS units only)

SSS Logic Board

See Section 2.

140

Autostart

YORK INTERNATIONAL

FORM 160.55-O1 (604)

TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE
CONTROL CENTER DISPLAY - CONTINUED

PROGRAMMED
SETPOINTS
BY OPERATOR

START-UP OF
SYSTEM AFTER
SHUTDOWN

PROBABLE CAUSE
AND SERVICE
REQUIRED

Will start at 59 PSID when compressor switch is
placed to STOP/RESET and then START.

This Shutdown is provided to check on Oil pressure
Transducers for failure in the high state. Replace Oil
Pressure Transducer in oil sump or compressor.

Restart automatically after Vane Motor arm linkage
is set properly. Press STOP/RESET and then

Vanes are set improperly. Reset vane linkage, check
vane positions using the Service key switch and proper

START switch.

keys on the OptiView Control Center or switch
of capacity board of Variable Speed Drive.

Press compressor STOP/RESET switch and then
START switch.

Check motor starter operation. Motor current value
greater than 15%.
Watchdog timer circuit has reset software program.
Chiller will automatically restart.

Reprogram the Control Center Setpoints and
proceed with Normal Start-up.

Weak Battery.
Replace RTC-IC chip U16.

Press STOP/RESET switch and then START
switch.

Oil Temperature Thermistor disconnected from Analog
Input Board. Reconnect or replace open sensor.

Press STOP/START switch and then START
switch.

Faulty Discharge Temperature Thermistor (RT2) or
disconnected from Analog Input Board. Connect or
replace open sensor.

Chiller will automatically restart when all phases of line
voltage increase to the minimum required starting level.

Low AC Line Voltage

Press STOP/RESET switch and then START
switch.

Motor Phase Current Unbalance

YORK INTERNATIONAL

141

Troubleshooting
FORM 160.55-O1 (604)

TABLE 2 – OPERATING ANALYSIS CHART
RESULTS

POSSIBLE CAUSE

REMEDY

1. SYMPTOM: ABNORMALLY HIGH DISCHARGE PRESSURE
Temperature difference between liquid
refrigerant out and water off condenser
higher than normal.

Air in condenser.

Purge unit operates automatically to take
care of this condition. Test for air leaks if
display reads:
“WARNING – EXCESS PURGE”

High discharge pressure.

Condenser tubes dirty or scaled.

Clean condenser tubes.
Check water conditioning.

High condenser water temperature.

Reduce condenser water inlet temperature.
(Check cooling tower and water circulation.)

Insufficient condensing water flow.

Increase the quantity of water through the
condenser to proper value.

Temperature difference between condenser water on and water off higher
than normal, with normal cooler pressure.

2. SYMPTOM: ABNORMALLY LOW SUCTION PRESSURE
Temperature difference between leaving
chilled water and refrigerant in cooler
greater than normal with high discharge
temperature.

Insufficient charge of refrigerant.

Check for leaks and charge refrigerant into
system.

Flow orifice blocked.

Remove obstruction.

Temperature difference between leaving
chilled water and refrigerant in the cooler
greater than normal with normal discharge
temperature.

Cooler tubes dirty or restricted.

Clean cooler tubes.

Temperature of chilled water too low with
low motor amperes.

Insufficient load for system capacity.

Check prerotation vane motor operation
and setting of low water temperature cutout.

Prerotation vanes fail to open.

Check the prerotation vane motor
positioning circuit.

System overloaded.

Be sure the vanes are wide open
(without overloading the motor) until the
load decreases.

3. SYMPTOM: HIGH COOLER PRESSURE
High chilled water temperature.

4. SYMPTOM: NO OIL PRESSURE WHEN SYSTEM START BUTTON PUSHED
Low oil pressure displayed on control
center; compressor will not start.

Oil pump running in wrong direction.

Check rotation of oil pump.
(Electrical Connections)

Oil pump not running.

Check electrical connections to oil pump
and press manual reset on oil pump starter
(on condenser shell in front of purge unit).

5. SYMPTOM: COMPRESSOR STARTS, NORMAL OIL PRESSURE DEVELOPS, FLUCTUATES FOR SHORT WHILE, THEN
COMPRESSOR STOPS ON OIL PRESSURE CUTOUT
Oil pressure normal, fluctuates, then compressor stops on Oil Pressure Cutout.
Display reading: “LOW OIL PRESSURE”

142

Unusual starting conditions exist, i.e., oil
foaming in reservoir and piping due to
lowered system pressure.

Drain the oil from the compressor and
charge new oil into the compressor. (See
“Oil Charging Procedure”, page 129.)

Burned out oil heater.

Replace oil heater.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

TABLE 2 – OPERATING ANALYSIS CHART - CONTINUED
RESULTS

POSSIBLE CAUSE

REMEDY

6. SYMPTOM: UNUSUALLY HIGH OIL PRESSURE DEVELOPS WHEN OIL PUMP RUNS
Unusually high oil pressure is displayed
when the oil pressure display key is
pressed when the oil pump is running.

High oil pressure. Transducer defective.
Relief valve is misadjusted.

Replace low or high oil pressure transducer.
Adjust external relief valve.

7. SYMPTOM: OIL PUMP VIBRATES OR IS NOISY
Oil pump vibrates or is extremely noisy
with some oil pressure when pressing
“Oil Pressure” display key.

Misalignment of pump or piping.
Mounting bolts loose.
Bent shaft.
Worn pump parts.

Correct condition or replace faulty part.

NOTE: When oil pump is run without
an oil supply it will vibrate and
become extremely noisy.

Oil not reaching pump suction inlet in
sufficient quantity.

Check oil supply and oil piping.

8. SYMPTOM: OIL PRESSURE GRADUALLY DECREASES (NOTED BY OBSERVATION OF DAILY LOG SHEETS)
Oil pressure (noted when pressing “Oil
Pressure” display key) drops to 70% of
oil pressure when compressor was
originally started.

Oil filter is dirty.

Change oil filter.

Extreme bearing wear.

Inspect compressor.

9. SYMPTOM: OIL RETURN SYSTEM CEASES TO RETURN AN OIL/REFRIGERANT SAMPLE
Oil refrigerant return not functioning.

Filter-drier in oil return system dirty.

Replace oil filter-drier with new.

Jet or orifice of oil return jet clogged.

Remove jet, inspect for dirt.
Remove dirt using solvent and replace.

10. SYMPTOM: OIL PUMP FAILS TO DELIVER OIL PRESSURE
No oil pressure registers when pressing
“Oil Pressure” display key when oil pump
runs.

Faulty oil pressure transducer.
Faulty writing/connectors.

Replace oil pressure transducer.

11. SYMPTOM: REDUCED OIL PUMP CAPACITY
Oil pump pumping capacity low.

Excessive end clearance in pump.
Other worn pump parts.

Inspect and replace worn parts.

Partially blocked oil supply inlet.

Check oil inlet for blockage.

12. SYMPTOM: IMPROPER PURGE UNIT OPERATION
Purge unit not purging and air is
present in the unit.

1. Faulty float switch assembly.
2. Faulty three-way oil solenoid valve.
3. Faulty exhaust solenoid valve.
4. Faulty pressure transducer.

Check these components and replace
where necessary.

Purge unit purging air and refrigerant

1. Faulty exhaust solenoid valve.
2. Faulty pressure transducer.
3. Lack of cooling.

Restore refrigerant liquid cooling supply.

YORK INTERNATIONAL

143

Maintenance
FORM 160.55-O1 (604)

SECTION 8
MAINTENANCE

RENEWAL PARTS
For any required Renewal Parts refer to Forms listed on page 4.

CHECKING SYSTEM FOR LEAKS
LEAK TESTING DURING OPERATION

To test with R-22, proceed as follows:

The refrigerant side of the system is carefully pressure
tested and evacuated at the factory.

1. With no pressure in the system, charge R-22 gas into
the system through the charging valve to a pressure
of 2 PSIG.

After the system is in operation under load, the high
pressure components should be carefully leak tested
with a leak detector to be sure all joints are tight. If a
leak exists frequent purging will be required or refrigerant will be lost.

2. Build up the system pressure with dry nitrogen to
approximately 10 PSIG. To be sure that the concentration of refrigerant has reached all parts of the
system, slightly open the oil charging valve and test
for the presence of refrigerant with a leak detector.

If any leaks are indicated, they must be repaired immediately. Usually, leaks can be stopped by tightening
ßare nuts or ßange bolts. However, if it is necessary to
repair a welded joint, the refrigerant charge must be
removed (See “Handling Refrigerant for Dismantling
and Repairs”, page 140).

3. Test around each joint and factory weld. It is important that this test by thoroughly and carefully done,
spending as much time as necessary and using a good
leak detector.
4. To check for refrigerant leaks in the cooler and condenser, open the vents in the cooler and condenser
heads and test for the presence of refrigerant. If
no refrigerant is present, the tubes and tube sheets
may be considered tight. If refrigerant is detected
at the vents, the heads must be removed, the leak
located (by means of soap test or leak detector) and
repaired.

CONDUCTING PRESSURE TEST

With the refrigerant charge removed and all known
leaks repaired, the system should be charged with a
small amount of R-22 mixed with dry nitrogen so that
a halide torch or electronic leak detector can be used to
detect any leaks too small to be found by the soap test.
Do not use excessive amounts of R-22; use only enough
for proper leak detection.

144

5. When absolute tightness of the system has been established, blow the mixture of nitrogen and refrigerant through the charging valve.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

*GAUGE
INCHES OF MERCURY (HG)
BELOW ONE STANDARD ATMOSPHERE
0

ABSOLUTE
PSIA

MILLIMETERS OF
MERCURY (HG)

MICRONS

BOILING
TEMPERATURES
OF WATER °F

14.696

760

760,000

212

10.24*

9.629

500

500,000

192

22.05*

3.865

200

200,000

151

25.98*

1.935

100

100,000

124

27.95*

.968

50,000

101

28.94*

.481

25,000

29.53*

.192

10,000

29.67*

.122

6.3

6,300

29.72*

.099

5,000

29.842*

.039

2,000

29.882*

.019

1.0

1,000

29.901*

.010

500

-11

29.917*

.002

100

-38

29.919*

.001

.05

-50

29.9206*

.0002

.01

-70

29.921*

* One standard atmosphere = 14.696 PSIA
= 760 mm Hg. absolute pressure at 32°F
= 29.921 inches Hg. absolute at 32°F

WATER
FREEZES

0
NOTES: PSIG = Lbs. per sq. in. gauge pressure
= Pressure above atmospheric
PSIA = Lbs. per sq. in. absolute pressure
= Sum of gauge plus atmospheric pressure

TABLE 3 – SYSTEM PRESSURES

LD00473

FIG. 63 – EVACUATION OF CHILLER

YORK INTERNATIONAL

145

Maintenance
FORM 160.55-O1 (604)

EVACUATION AND DEHYDRATION OF UNIT
VACUUM TESTING

VACUUM DEHYDRATION

After the pressure test has been completed theVacuum
test should be conducted as follows:
1. Connect a high capacityVacuum pump, with indicator, to the system charging valve as shown in
Fig. 63 and start the pump (see “Vacuum Dehydration”).
2. Open wide all system valves, including the purge and
gauge valves. Be sure all valves to the atmosphere
are closed.
3. Operate theVacuum pump in accordance with “Vacuum Dehydration” until a wet bulb temperature of
+32°F or a pressure of 5mm Hg. is reached. See Table
3 for corresponding values of pressure.
4. To improve evacuation circulate hot water (not to
exceed 125°F) through the cooler and condenser
tubes to thoroughly dehydrate the shells. If a source
of hot water is not readily available, a portable
water heater should be employed. DO NOT USE
STEAM. A suggested method is to connect a hose
between the source of hot water under pressure and
the cooler head drain connection, out the cooler vent
connection, into the condenser head drain and out the
condenser vent. To avoid the possibility of causing
leaks, the temperature should be brought up slowly
so that the tubes and shell are heated evenly. Close
the system charging valve and the stop valve between
theVacuum indicator and theVacuum pump. (See Fig.
63) Then disconnect theVacuum pump leaving theVacuum indicator in place.
5. Hold theVacuum obtained in Step 3 in the system for
8 hours; the slightest rise in pressure indicates a leak
or the presence of moisture, or both. If, after 8 hours
the wet bulb temperature in theVacuum indicator has
not risen above 40°F or a pressure of 6.3mm Hg, the
system may be considered tight.

To obtain a sufÞciently dry system, the following instructions have been assembled to provide an effective
method for evacuating and dehydrating a system in
the Þeld. Although there are several methods of dehydrating a system, we are recommending the following,
as it produces one of the best results, and affords a
means of obtaining accurate readings as to the extent
of dehydration.

Be sure theVacuum indicator is valved
off while holding the systemVacuum
and be sure to open the valve between
theVacuum indicator and the system
when checking theVacuum after the 8
hour period.
6. If theVacuum does not hold for 8 hours within the
limits speciÞed in Step 5 above, the leak must be
found and repaired.

146

The equipment required to follow this method of dehydration consists of a wet bulb indicator orVacuum
gauge, a chart showing the relation between dew point
temperature and pressure in inches of mercury (vacuum),
(see Table 3) and aVacuum pump capable of pumping a
suitableVacuum on the system.
OPERATION

Dehydration of a refrigeration system can be obtained
by this method because the water present in the system
reacts much as a refrigerant would. By pulling down
the pressure in the system to a point where its saturation temperature is considerably below that of room
temperature, heat will ßow from the room through the
walls of the system and vaporize the water, allowing
a large percentage of it to be removed by theVacuum
pump. The length of time necessary for the dehydration
of a system is dependent on the size or volume of the
system, the capacity and efÞciency of theVacuum pump,
the room temperature and the quantity of water present
in the system. By the use of theVacuum indicator as
suggested, the test tube will be evacuated to the same
pressure as the system, and the distilled water will be
maintained at the same saturation temperature as any
free water in the system, and this temperature can be
observed on the thermometer.
If the system has been pressure tested and found to be
tight prior to evacuation, then the saturation temperature
recordings should follow a curve similar to the typical
saturation curve shown as Fig. 64.
The temperature of the water in the test tube will drop as
the pressure decreases, until the boiling point is reached,
at which point the temperature will level off and remain
at this level until all of the water in the shell is vaporized. When this Þnal vaporization has taken place the
pressure and temperature will continue to drop until
eventually a temperature of 35°F or a pressure of 5mm
Hg. is reached.
YORK INTERNATIONAL

FORM 160.55-O1 (604)

it to atmospheric pressure and the indicator temperature
will return to approximately ambient temperature. Close
off the system again, and start the second evacuation.
The relatively small amount of moisture left will be carried out through theVacuum pump and the temperature or
pressure shown by the indicator should drop uniformly
until it reaches a temperature of 35°F or a pressure of
5mm Hg.

LD00474

FIG. 64 – SATURATION CURVE

When this point is reached, practically all of the air has
been evacuated from the system, but there is still a small
amount of moisture left. In order to provide a medium
for carrying this residual moisture to theVacuum pump,
nitrogen should be introduced into the system to bring

When theVacuum indicator registers this temperature or pressure it is a positive sign that the system is
evacuated and dehydrated to the recommended limit.
If this level can not be reached, it is evident that there
is a leak somewhere in the system. Any leaks must be
corrected before the indicator can be pulled down to
35°F or 5mm Hg. in the primary evacuation. During
the primary pulldown keep a careful watch on the wet
bulb indicator temperature, and do not let it fall below
35°F. If the temperature is allowed to fall to 32°F the
water in the test tube will freeze, and the result will be
a faulty temperature reading.

REFRIGERANT CHARGING
To avoid the possibility of freezing the liquid within the
cooler tubes when charging an evacuated system, only
refrigerant vapor from the top of the drum or cylinder
must be admitted to the system until the system pressure
is raised above the point corresponding to the freezing
point of the cooler liquid. For water, the pressure corresponding to the freezing point is 20.4 in Hg.Vacuum
for R-123 (at sea level).
While charging, every precaution must be taken to
prevent moisture laden air from entering the system.
Make up a suitable charging connection from new copper tubing to Þt between the system charging valve
and the Þtting on the charging drum. This connection
should be as short as possible but long enough to permit
sufÞcient ßexibility for changing drums. The charging
connection should be purged each time a full container
of refrigerant is connected and changing containers
should be done as quickly as possible to minimize the
loss of refrigerant.

TABLE 4 – REFRIGERANT CHARGE
SHELL CODES

G0, G1, G3

FACTORY
CHARGE
LBS.
890

G0, G1, G3

890

900

H1, H3

−

970

975

COOLER

COMPRESSOR

SHIPPED

900

J1, J3

−

1130

1125

K1, K3

−

1270

1275

G0, G1, G3

890

900

H1, H3

−

970

975

J1, J3

−

1130

1125

K1, K3

−

1270

1275

L1, L3

−

1390

1400

K4, K6

1390

1400

K7, K9

−

1530

1550

L4, L6

−

1590

1600

Refrigerant may be furnished in drums containing either
100, 200 or 650 lbs. of refrigerant. These drums are not
returnable and they should be stored for future use if
it should ever become necessary to remove refrigerant
from the system.

YORK INTERNATIONAL

147

Maintenance
FORM 160.55-O1 (604)

CHECKING THE REFRIGERANT CHARGE DURING UNIT SHUT DOWN
The refrigerant charge is speciÞed for each chiller model
(See Table 4). Charge the correct amount of refrigerant
and record the level in the cooler sight glass.
The refrigerant charge should always be checked and
trimmed when the system is shut down.
The refrigerant charge level must be checked after the
pressure and temperature has equalized between the

condenser and cooler. This would be expected to be 4
hours or more after the compressor and water pumps are
stopped. The level should be at the center of the sight
glass ±1/4 inch.
Charge the refrigerant in accordance with the method
shown under “Refrigerant Charging” above. The refrigerant level should be observed and the level recorded
after initial charging.

HANDLING REFRIGERANT FOR
DISMANTLING AND REPAIRS
If it becomes necessary to open any part of the refrigerant
system for repairs, the following paragraphs outline the
procedure for handling the refrigerant while the system
is open.
Since Refrigerant-123 boils at 82°F under atmospheric
pressure, it will not be necessary to remove the refrigerant if the system it to be open for only a few hours. Any
part of the system which is above the liquid level will be
accessible without disturbing the refrigerant charge.

clean drums for the duration of the repair period.
If conditions permit, the system pressure should be as
near as possible to atmospheric before opening the system and the refrigerant charge should be kept as near
as possible to 82°F to keep either the refrigerant loss or
the air intake to a minimum. After the system has been
re-assembled, the air should be removed by means of
the purge unit. (See “Purging the System”.)

If the system must remain open for more than a few
hours the refrigerant should be drained and stored in

MEGGING THE MOTOR
While the main disconnect switch and compressor motor
starter are open, meg the motor as follows:

2. If readings fall below shaded area, remove external
leads from motor and repeat test.

1. Using a megohm meter (megger), meg between
phases and each phase to ground (see Fig. 65); these
readings are to be interpreted using the graph shown
in Fig. 66.

Motor is to be megged with the starter
at ambient temperature after 24 hours
of idle standby.

148

YORK INTERNATIONAL

FORM 160.55-O1 (604)

LD00475

FIG. 65 – DIAGRAM, MEGGING MOTOR WINDINGS

CONDENSERS AND COOLERS
GENERAL

Maintenance of condenser and cooler shells is important to provide trouble free operation of the chiller.
The water side of the tubes in the shell must be kept
clean and free from scale. Proper maintenance such as
tube cleaning, and testing for leaks, is covered on the
following pages.
CHEMICAL WATER TREATMENT

Since the mineral content of the water circulated through
coolers and condensers varies with almost every source
of supply, it is possible that the water being used may
corrode the tubes or deposit heat resistant scale in them.
Reliable water treatment companies are available in most
larger cities to supply a water treating process which will
greatly reduce the corrosive and scale forming properties
of almost any type of water.
As a preventive measure against scale and corrosion
and to prolong the life of cooler and condenser tubes, a
chemical analysis of the water should be made preferably
before the system is installed. A reliable water treatment
company can be consulted to determine whether water
treatment is necessary, and if so, to furnish the proper
treatment for the particular water condition.
CLEANING COOLER AND CONDENSER TUBES

Cooler
It is difÞcult to determine by any particular test whether
possible lack of performance of the water cooler is due
to fouled tubes alone or due to a combination of troubles.
Trouble which may be due to fouled tubes is indicated
YORK INTERNATIONAL

when, over a period of time, the cooling capacity decreases and the split (temperature difference between
water leaving the cooler and the refrigerant temperature
in the cooler) increases. A gradual drop-off in cooling
capacity can also be caused by a gradual leak of refrigerant from the system or by a combination of foul ed
tubes and shortage of refrigerant charge. An excessive
quantity of oil in the cooler can also contribute to erratic
performance.
Condenser
In a condenser, trouble due to fouled tubes is usually
indicated by a steady rise in head pressure, over a period
of time, accompanied by a steady rise in condensing
temperature, and noisy operation. These symptoms may
also be due to foul gas buildup. Purging will remove the
foul gas revealing the effect of fouling.
TUBE FOULING

Fouling of the tubes can be due to deposits of two types
as follows:
1. Rust or sludge, which Þnds its way into the tubes
and accumulates there. This material usually does
not build up on the inner tube surfaces as scale, but
does interfere with heat transfer. Rust or sludge can
generally be removed from the tubes by a thorough
brushing process.
2. Scale, due to mineral deposits. These deposits, even
though very thin and scarcely detectable upon physical inspection, are highly resistant to heat transfer.
They can be removed most effectively by circulating
an acid solution through the tubes.
149

Maintenance

MEGOHMS

Minimum Insulation Resistance vs. Temperature (per IEEE Std 43)
Open Motors

FORM 160.55-O1 (604)

TEMPERATURE – °F

LD00476

FIG. 66 – MOTOR STATOR TEMPERATURE AND INSULATION RESISTANCES
150

YORK INTERNATIONAL

FORM 160.55-O1 (604)

TUBE CLEANING PROCEDURES

Brush Cleaning of Tube
If the tube fouling consists of dirt and sludge, it can
usually be removed by means of the brushing process.
Drain the water sides of the circuit to be cleaned (cooling
water or chilled water) remove the heads and thoroughly
clean each tube with a soft bristle bronze brush. DO
NOT USE A STEEL BRISTLE BRUSH. A steel brush
may damage the tubes.
Improved results can be obtained by admitting water into
the tube during the cleaning process. This can be done
by mounting the brush on a suitable length of 1/8" pipe
with a few small holes at the brush end and connecting
the other end by means of a hose to the water supply.
The tubes should always be brush cleaned before acid
cleaning.
Acid Cleaning of Tubes
If the tubes are fouled with a hard scale deposit, they
must be acid cleaned. It is important that before acid
cleaning, the tubes be cleaned by the brushing process
described above. If the relatively loose foreign material
is removed before the acid cleaning, the acid solution
will have less material to dissolve and ßush from the
tubes with the result that a more satisfactory cleaning job
will be accomplished with a probable saving of time.
COMMERCIAL ACID CLEANING

In many major cities, commercial organizations now
offer a specialized service of acid cleaning coolers
and condensers. If acid cleaning is required, YORK
recommends the use of this type of organization. The
Dow Industries Service Division of the Dow Chemical
Company, Tulsa, Oklahoma, with branches in principal
cities is one of the most reliable of these companies.
TESTING FOR COOLER AND CONDENSER TUBE
LEAKS

Cooler and condenser tube leaks may result in refrigerant
leaking into the water circuit, or water leaking into the
shell depending on the pressure levels. If refrigerant is
leaking into the water it can be detected at the liquid head
vents after a period of shutdown. If water is leaking into
the refrigerant, frequent purging will be necessary and
system capacity and efÞciency will drop off sharply. If
a tube is leaking and water has entered the system, the
cooler and condenser should be valved off from the rest
of the water circuit and drained immediately to prevent
severe rusting and corrosion. If a tube leak is indicated,
the exact location of the leak may be determined as
follows:
YORK INTERNATIONAL

1. Allow the system to warm up until a substantial
pressure is reached for testing. Dry nitrogen (pressure not to exceed 12 PSIG) may be admitted to the
unit to increase pressure in the shell. Remove the
heads and listen at each section of tubes for a hissing sound that would indicate gas leakage. This will
assist in locating the section of tubes to be further
investigated. If the probable location of the leaky
tubes has been determined, treat that section in the
following manner (if the location is not deÞnite, all
the tubes will require investigation).
2. Wash off both tube heads and the ends of all tubes
with water.

Do not use carbon tetrachloride for
this purpose since its fumes give the
same flame discoloration that the refrigerant does.
3. With nitrogen or dry air blow out the tubes to clear
them of traces of refrigerant laden moisture from the
circulation water. As soon as the tubes are clear, a cork
should be driven into each end of the tube. Repeat this
with all of the other tubes in the suspected section or if
necessary, with all the tubes in the cooler or condenser.
Allow the cooler or condenser to remain corked up to
12 to 24 hours before proceeding. Depending upon
the amount of leakage, the corks may blow from the
end of a tube, indicating the location of the leakage.
If not, it will be necessary to make a very thorough
test with the halide torch.
4. After the tubes have been corked for 12 to 24 hours,
it is recommended that two men working at both
ends of the cooler carefully test each tube - one man
removing corks at one end and the other at the opposite end to remove corks and handle the test torch.
Start with the top row of tubes in the section being
investigated, remove the corks at the ends of one
tube simultaneously and insert the exploring tube
for 5 seconds - this should be long enough to draw
into the detector any refrigerant gas that might have
leaked through the tube walls. A fan placed at the end
of the cooler opposite the torch will assure that any
leakage will travel through the tube to the torch.
5. Mark any leaking tubes for later identiÞcation.
6. If any of the tube sheet joints are leaking, the leak
should be detected by the test torch. If a tube sheet
leak is suspected, its exact location may be found
by using a soap solution. A continuous buildup of
bubbles around a tube indicates a tube sheet leak.

151

Preventive Maintenance
FORM 160.55-O1 (604)

COMPRESSOR
Maintenance for the compressor assembly consists of
checking the operation of the oil return system and changing the dehydrator, checking and changing the oil, checking and changing the oil Þlters, checking the operation of
the oil heater, checking the operation of the oil pump and
observing the operation of the compressor.
Internal wearing of compressor parts could be a serious
problem caused by improper lubrication, brought about
by restricted oil lines, passages or dirty oil Þlters. If the
unit is shutting down on (HOT) High Oil Temperature
or Low Oil Pressure (OP), change the oil Þlter element.

Examine the oil Þlter element for the presence of aluminum particles. Aluminum gas seal rings can contact
the impeller and account for some aluminum particles
to accumulate in the oil Þlter, especially during the
initial start up and Þrst several months of operation.
However, if aluminum particles continue to accumulate and the same conditions continue to stop the unit
operation after a new Þlter element is installed, notify
the nearest YORK ofÞce to request the presence of a
YORK Service Technician.

ELECTRICAL CONTROLS
For information covering the OptiView Control Center
operation, refer to “Section 2”. The operating points
of the pressure and temperature cut outs are shown in

the Wiring Diagrams. These diagrams also contain a
starting and stopping sequence and timing sequence
diagram.

SECTION 9
PREVENTIVE MAINTENANCE
It is the responsibility of the owner to provide the necessary daily, monthly and yearly maintenance requirements of the system. IMPORTANT: If a unit 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.
In any operating system it is most important to provide
a planned maintenance and inspection of its functioning
parts to keep it operating at its peak efÞciency. Therefore,
the following maintenance should be performed when
prescribed.
COMPRESSOR

COMPRESSOR MOTOR

1. Check motor mounting screws frequently to insure
tightness.
2. Meg motor windings annually to check for deterioration of windings.
PRESSURE TESTING

Oil Filter

Oil Filter: On all new chiller start-ups, the
oil filter must be changed after the first 200
hours of operation and again at 500 hours
of operation to insure proper lubrication
quality for the compressor. These filters
should be inspected for excessive debris,
and if found containing excessive debris,
report this to the local YORK Engineered

152

Systems's Service office for evaluation.
After the 500 hour replacement, the oil
filter should be replaced semi-annually, or
when the operating oil pressure drops 30%
from the oil pressure measured at the time
of the previous replacement.

The chiller should be pressure tested annually. Any leaks
found must be repaired immediately. If frequent purging
has occurred, the unit must be pressure tested as soon
as possible to prevent air and moisture from entering
the until. Air and moisture are the worst enemies of
the R-123 system and experience has shown that units
which are maintained tight, are systems that will provide
trouble free efÞcient operation.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

COOLER AND CONDENSER

The major portion of maintenance on the condenser and
cooler will deal with the maintaining of the water side
of the condenser and cooler in a clean condition.
The use of untreated water in cooling towers, closed
water systems, etc. frequently results in one or more of
the following:
1. Scale Formation
2. Corrosion or Rusting
3. Slime and Algae Formation
It is therefore to the beneÞt of the user to provide for
proper water treatment to provide for a longer and more
economical life of the equipment. The following recommendation should be followed in determining the
condition of the water side of the condenser and cooler
tubes.
1. The condenser tubes should be cleaned annually or
earlier if conditions warrant. If the temperature difference between the water off the condenser and the
condenser liquid temperature is more than 4° greater
than the difference recorded on a new unit it is a good
indication that the condenser tubes require cleaning.
They should be cleaned as instructed on page 143 of
this manual.
2. The cooler tubes under normal circumstances will
not require cleaning. If however the temperature
difference between the refrigerant and the chilled
water increases slowly over the operating season, it
is an indication that the cooler tubes may be fouling
or that there may be a water by-pass in the water box
requiring gasket replacement.
PURGE UNIT

Every Three Months
1. Change the purge unit dehydrator.
a. If the unit is operating;
1) When the purge unit is in the drain cycle,
close the valve in the high pressure oil supply line and allow the unit to complete the
drain cycle.

YORK INTERNATIONAL

2) Close condenser gas and oil return valves and
replace the dehydrator.
3) Open all valves to return the purge unit to
normal operation.
Annually
1. Clean and inspect all valves which are part of the
purge unit system.
2. Drain and ßush the oil and refrigerant from the purge
unit shell.
a. Before ßushing remove the ßoat assembly from
the purge unit shell.
b. Disconnect the oil line from he bottom of the
purge unit shell.
c. To clean - ßush refrigerant from the top of the
purge unit shell and let the refrigerant drain from
the bottom through the oil line connection.
d. After a complete ßushing, replace the ßoat assembly and the oil drain line.
3. Clean the following oriÞce.
a. One (1) oriÞce in the liquid line feed to the cooling coil.
b. Purge unit exhaust oriÞce.
4. Inspect the foul gas inlet check valve.
OIL RETURN SYSTEM

1. Change the dehydrator in the oil return system semiannually or earlier if the oil return system fails to
operate.
2. When the dehydrator is changed the nozzle of the
eductor should be checked for any foreign particles
that may be obstructing the jet.
ELECTRICAL CONTROLS

1. All electrical controls should be inspected for obvious malfunctions.
2. It is important that the factory settings of controls
(operation and safety) not be changed. If the settings
are changed without YORK’s approval the warranty
will be jeopardized.
3. A 5-11 year life battery is part of the RTC-Real Time
Clock. To replace refer to Section 2.

153

FORM 160.55-O1 (604)

SECTION 10
OPTISAVE ENERGY ANALYSER FEATURE
The OptiSave Energy Analyzer Feature reveals the
advantage of a compressor motor variable speed drive.
It calculates the amount of energy that has been saved
by having a variable speed drive instead of a constant
speed drive. The savings are determined by calculating
the energy consumption of a constant speed drive and
subtracting the measured energy consumption of the
variable speed drive. The resulting difference is the
energy savings.

154

This data is displayed but does not affect chiller operation or performance. This feature is available in
software versions C.MLM.02.05.xxx (and later) and
C.OPT.02.05.301 (and later). It is not operational until
enabled using a special procedure. A complete description and all required installation, enable and setup information is contained in YORK Service Information
Letter SI0068.

YORK INTERNATIONAL

FORM 160.55-O1 (604)

NOTES

YORK INTERNATIONAL

155

800-861-1001
www.york.com

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