York Ycal0014Sc Users Manual Form 150.62 NM1 (700), Millennium Air Cooled Liquid Chillers Hermetic Scroll, Installation, Operation, Maintenance

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MILLENNIUM ®
AIR-COOLED LIQUID CHILLERS
HERMETIC SCROLL
INSTALLATION, OPERATION, MAINT.

Supersedes: 150.62-NM1 (899)

Form 150.62-NM1 (700)

YCAL0014SC - YCAL0080SC

29224(R)A

200-3-60
230-3-60
380-3-60
460-3-60
575-3-60
MODELS ONLY

Standard, Glycol & Metric Models, Combined

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 mis-used 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.

WARNING indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.

2

YORK INTERNATIONAL

FORM 150.62-NM1

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.

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

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 provide current information automatically to the
manual owner, that information, if applicable, can be obtained by contacting the
nearest YORK Engineered Systems Service office.
It is the responsibility of operating/service personnel to verify 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 modified and if current literature is available.

YORK INTERNATIONAL

3

TABLE OF CONTENTS AND TABLES
PAGE

PRODUCT IDENTIFICATION NUMBER .......................................................... 7
REFRIGERANT FLOW DIAGRAM ................................................................... 9
SECTION 1 INSTALLATION .......................................................................... 10
ELECTRICAL DATA ....................................................................................... 20
OPERATIONAL LIMITATIONS ....................................................................... 30
PHYSICAL DATA ............................................................................................ 34
DIMENSIONS & CLEARANCES .................................................................... 38
PRE-STARTUP CHECKLIST ......................................................................... 54
INITIAL STARTUP .......................................................................................... 55
UNIT OPERATING SEQUENCE .................................................................... 57
SECTION 2 UNIT CONTROLS ...................................................................... 58
STATUS KEY .................................................................................................. 60
DISPLAY/PRINT KEYS .................................................................................. 66
ENTRY KEYS ................................................................................................. 73
SETPOINTS KEY ........................................................................................... 74
UNIT KEYS .................................................................................................... 81
UNIT OPERATION ......................................................................................... 85
SECTION 3 SERVICE AND TROUBLESHOOTING ...................................... 95
OPTIONAL PRINTER INSTALLATION ......................................................... 104
TROUBLESHOOTING CHARTS .................................................................. 105
MAINTENANCE ........................................................................................... 108
ISN CONTROL ............................................................................................. 109
SECTION 4

WIRING DIAGRAMS ............................................................... 112

SECTION 5 APPENDIX 1 – ISOLATORS .................................................... 128
YORK APPLIED SYSTEMS FIELD OFFICE LISTING ................................. 134
TABLES

4

1

MICROPANEL POWER SUPPLY ............................................................ 20

2

STANDARD SINGLE POINT POWER ..................................................... 21

3

STANDARD DUAL POINT POWER ................................................ 22 – 23

4

OPTIONAL SINGLE POINT POWER .............................................. 24 – 25

5

OPTIONAL SINGLE POINT POWER .............................................. 26 – 27

6

OPTIONAL SINGLE POINT POWER .............................................. 28 – 29

7

TEMPERATURES AND FLOWS (ENGLISH) .......................................... 30

8

VOLTAGE LIMITATIONS (ENGLISH) ....................................................... 30

9

COOLER PRESSURE DROPS (ENGLISH) ............................................. 31

10

ETHYLENE GLYCOL CORRECTION FACTORS .................................... 31

11

TEMPERATURES AND FLOWS (METRIC) ............................................ 32

12

VOLTAGE LIMITATIONS (METRIC) ........................................................ 32
YORK INTERNATIONAL

FORM 150.62-NM1

TABLES AND FIGURES
PAGE

TABLES
13

COOLER PRESSURE DROPS (METRIC)............................................. 33

14

ETHYLENE GLYCOL CORRECTION FACTORS .................................. 33

15

PHYSICAL DATA (ENGLISH) ........................................................ 34 – 35

16

PHYSICAL DATA (METRIC) .......................................................... 36 – 37

17

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (ENGLISH) ............. 39

18

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (ENGLISH) ............. 41

19

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (ENGLISH) ............. 43

20

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (ENGLISH) ............. 45

21

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (METRIC) ............... 47

22

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (METRIC) ............... 49

23

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (METRIC) ............... 51

24

WEIGHT DISTRIBUTION/CENTER OF GRAVITY (METRIC) ............... 53

25

SETPOINT ENTRY LIST ....................................................................... 54

26

STATUS KEY MESSAGES .................................................................... 65

27

OPERATOR DATA QUICK REFERENCE .............................................. 69

28

COOLING SETPOINTS PROGRAMMABLE LIMITS & DEFAULTS ....... 76

29

PROGRAM KEY LIMITS & DEFAULTS ................................................. 79

30

SETPOINTS KEY QUICK REFERENCE ............................................... 80

31

UNIT KEYS QUICK REFERENCE ......................................................... 84

32

LEAVING CHILLED LIQUID CONTROL – 6 COMPRESSORS ............. 86

33

LEAVING CHILLED LIQUID CONTROL – 4 COMPRESSORS ............. 86

34

LEAVING CHILLED LIQUID CONTROL – 3 COMPRESSORS ............. 87

35

LEAVING CHILLED LIQUID CONTROL – 2 COMPRESSORS ............. 87

36

COMPRESSOR STAGING FOR RETURN WATER CONTROL ............ 89

37

RETURN CHILLED LIQUID CONTROL – 6 COMPRESSORS .............. 89

38

RETURN CHILLED LIQUID CONTROL – 4 COMPRESSORS .............. 89

39

CONDENSER FAN CONTROL USING OUTDOOR AMBIENT
TEMPERATURE AND DISCHARGE ..................................................... 90

40

CONDENSER FAN CONTROL USING DISCHARGE ONLY ................. 90

41

LOW AMBIENT CONDENSER FAN CONTROL – AMBIENT
TEMPERATURE AND DISCHARGE PRESSURE CONTROL ............. 91

42

LOW AMBIENT CONDENSER FAN CONTROL – DISCHARGE
PRESSURE CONTROL ....................................................................... 91

43

COMPRESSOR OPERATION – LOAD LIMITING ................................. 92

44

MICROBOARD BINARY INPUTS .......................................................... 97

45

MICROBOARD ANALOG INPUTS ........................................................ 97

46

MICROBOARD OUTPUTS .................................................................... 97

47

OUTDOOR AIR SENSOR VALUES ....................................................... 99

YORK INTERNATIONAL

5

TABLES/FIGURES
PAGE

TABLES
48

ENTERING & LEAVING CHILLED LIQUID TEMPERATURE
SENSOR VALUES ............................................................................ 100

49

KEYPAD PIN ASSIGNMENT MATRIX ................................................. 103

50

TROUBLESHOOTING CHARTS ............................................... 105 – 107

51

ISN RECEIVED DATA .......................................................................... 109

52

ISN TRANSMITTED DATA .................................................................. 109

53

ISN TRANSMITTED DATA .................................................................. 110

54

ISN OPERATIONAL & FAULT CODES ................................................. 111

FIGURES
1

REFRIGERANT FLOW DIAGRAM .......................................................... 9

2

STANDARD POWER SUPPLY WIRING ................................................ 14

3

OPTIONAL SINGLE POINT POWER SUPPLY WIRING ....................... 15

4

OPTIONAL SINGLE POINT POWER SUPPLY WIRING –
N-F DISC SW OR CIRC BKR ............................................................. 16

5

CONTROL WIRING .............................................................................. 17

6

LEAVING WATER TEMPERATURE CONTROL –
COMPRESSOR STAGING .................................................................. 86

7

FIELD & FACTORY ELECTRICAL CONNECTIONS –
REMOTE TEMPERATURE RESET BOARD ....................................... 94

6

8

MICROBOARD LAYOUT ....................................................................... 98

9

MICROBOARD RELAY CONTACTS ARCHITECTURE ....................... 103

10

PRINTER TO MICROBOARD ELECTRICAL CONNECTIONS ........... 104

11

ELEMENTARY DIAGRAM ................................................................... 112

12

ELEMENTARY DIAGRAM – POWER CIRCUIT .................................. 114

13

ELEMENTARY DIAGRAM ................................................................... 116

14

ELEMENTARY DIAGRAM – POWER CIRCUIT .................................. 118

15

ELEMENTARY DIAGRAM ................................................................... 120

16

ELEMENTARY DIAGRAM – POWER CIRCUIT .................................. 122

17

ELEMENTARY DIAGRAM ................................................................... 124

18

ELEMENTARY DIAGRAM – POWER CIRCUIT .................................. 126

19

TYPE CP 1 ........................................................................................... 130

20

TYPE CP 2 ........................................................................................... 130

21

R SPRING SEISMIC ISOLATOR ......................................................... 131

22

TYPE CP MOUNTING ......................................................................... 132

23

“AEQM” SPRING-FLEX MOUNTING ................................................... 133

YORK INTERNATIONAL

FORM 150.62-NM1

PRODUCT IDENTIFICATION NUMBER (PIN)

EXAMPLES:
1

2

3

4

5

6

7

8

9

Y

C

A

S

1

3

8

5

E

10 11 12 13 14 15
A

5

0

Y

F

A

Y

C

A

L

0

0

8

0

S

C

4

6

X

A

A

BASIC MODEL NUMBER

YCAL0080SC46xAA
1 2 3 4
BASE PRODUCT TYPE
Y
C
A
U

5 6 7 8
NOMINAL CAPACITY

9
UNIT DESIGNATOR

0 # # #
S : Standard Unit
: YORK
1 # # #
: Chiller
: Air-Cooled Even Number: 60 HZ Nominal Tons
: Condensing Odd Number: 50 HZ Nominal kW
Unit
L : Scroll

YORK INTERNATIONAL

10
REFRIGERANT
C : R-22

11 12 13

14 15

VOLTAGE/STARTER

DESIGN/DEVELOPMENT LEVEL

1
2
4
4
5
5

7
8
0
6
0
8

: 200 / 3/ 60 A
: 230 / 3 / 60
: 380 / 3 / 60
: 460 / 3 / 60
: 380-415 / 3 / 50
: 575 / 3 / 60
X : Across the Line

: Design Series A
A : Engineering
Change
or PIN Level

7

OPTIONS MODEL NUMBER

X

S

X

2

X

5

X

C

X

X

X

1

X

X

X

X

X

X

X

X

X

3

X

D

X

W

X

S

X

A

A

R

X

X

X

B

X

X

X

X

X

4

X

B

X

X

X

X

X

L

X

X

X

S

X

D

X

: Low Sound Fans

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

PRODUCT IDENTIFICATION NUMBER (PIN)

R

E

:Hot Gas By-Pass
(# circuits)
:Compressor External
Overload

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

P

X

1

55
EXTENDED FIELD

YORK INTERNATIONAL

X

:Leaving Supply Temp.
:Chicago Relief Code

C

1 : 1" Deflection
S : Seismic
N : Neoprene Pads

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

X

L

L

B

L

R

#

: Wire Condenser Headers Only (factory)
: Wire (Full Unit) Enc. Panels (factory)
: Wire (Full Unit) Enc. Panels (field)
: Wire/Louvered Enc. Panels (factory)
: Wire/Louvered Enc. Panels (field)
: Louvered (Cond. Only) Enc. Panels (factory)
: Louvered (Cond. Only) Enc. Panels (field)
: Louvered (Full Unit) Enc. Panels (factory)
: Louvered (Full Unit) Enc. Panels (field)
: Acoustic Sound Blanket

x
1
2
3
4
5
6
7
8

X

A

: Aluminum
: Copper
: Black Fin
: Phenolic
X : TEAO Fan
Motors

R

S

X
C
B
P

S

W
V

: 300 PSIG DWP Waterside
: Double Thick Insulation
: Weld Flange Kit
: Victaulic Flange Kit
: Flow Switch
: ASME Pressure Vessel &
Associated Codes
: Remote DX Cooler

CABINET FIELD

X

D

48 49 50 51 52 53 54

T

3

45 46 47
CONDENSER FIELD

X

EVAP. FIELD

R

A

38 39 40 41 42 43 44

L
N
C

X

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

X

R
S
B

C

: Control Transformer (factory)
C : Power Factor Capacitor

T

S
F
G
I

X

T

#
: Low Ambient Kit (factory)
: High Ambient Kit (factory)
: Both Low / High Ambient (factory)
: BAS/EMS Temp. Reset / Offset
: Spanish LCD & Keypad Display
: French LCD & Keypad Display
: German LCD & Keypad Display
: Discharge Pressure Transducers/
Readout Kit
: Suction Pressure Transducers /
Readout Kit
: Both Discharge & Suction Pressure
Transducers / Readout
: N. American Safety Code
(cU.L./cE.T.L.)
: No Listing (typically 50 HZ non-C.E.,
non-U.L.
: Remote Control Panel
S : Sequence Control & Automatic
Lead Transfer

X

T

L
H
A

D

: SP Supply TB
: MP Supply TB
: SP Supply TB
: SP NF Disconnect Switch
: SP Circuit Breaker w/ Lockable Handle

X
X
X
D
X

29 30 31 32 33 34 35 36 37
COMPRESSOR / PIPING FIELD

X

X
X
S
S
B

CONTROLS FIELD

S

20 21 22 23 24 25 26 27 28

POWER FIELD

EXAMPLES:

8
16 17 18 19

FORM 150.62-NM1

REFRIGERANT FLOW DIAGRAM

AIR COOLED CONDENSERS

YCAL REFRIGERANT FLOW DIAGRAM
(INCLUDING TEMPERATURE SENSORS & PRESSURE TRANSDUCERS)
NOTE: YCAL0040-0080 HAVE TWO REFRIGERANT
SYSTEMS AND ONE DX COOLER.
* HOT GAS OPTION - SYSTEM 1 ONLY

SIGHT GLASS /
MOISTURE INDICATOR

LIQUID LINE FILTER / DRIER

LIQUID LINE
SERVICE VALVE

LIQUID LINE
SOLENOID VALVE

HOT DISCHARGE
GAS LINE

DISCHARGE LINE
BALL VALVE

* SOLENOID OPERATED

HOT GAS BY PASS VALVE

OPTIONAL DISCHARGE
PRESSURE TRANSDUCER

TXV
EQUALIZER
LINE

SERVICE VALVE
HIGH PRESSURE
CUTOUT SWITCH

SUCTION LINE
BALL VALVE
RELIEF VALVE
300 PSIG
(20.68 BARG)

SERVICE
VALVE

DX COOLER

LOW PRESSURE SWITCH OR
SUCTION PRESSURE TRANSDUCER

RETURN WATER
TEMP. SENSOR

LEAVING CHILLED WATER

LEAVING
CHILLED WATER
TEMP. SENSOR

ENTERING CHILLED WATER

OIL EQUALIZING
LINE
2 OR 3 COMPRESSORS PER SYSTEM

LD03844

FIG. 1 – REFRIGERANT FLOW DIAGRAM
YORK INTERNATIONAL

9

Installation

INSTALLATION
To ensure warranty coverage, this
equipment must be commissioned and
serviced by an authorized YORK service mechanic or a qualified service
person experienced in chiller installation. Installation must comply with
all applicable codes, particularly in
regard to electrical wiring and other
safety elements such as relief valves,
HP cut-out settings, design working
pressures, and ventilation requirements consistent with the amount and
type of refrigerant charge.

The unit should be lifted by inserting hooks through
the holes provided in unit base rails. Spreader bars
should be used to avoid crushing the unit frame
rails with the lifting chains. See below.

Lethal voltages exist within the control panels. Before servicing, open and
tag all disconnect switches.

29224(RIG)A

INSPECTION
INSTALLATION CHECK LIST
The following items, 1 thru 5, must be checked before
placing the units in operation.
1. Inspect the unit for shipping damage.
2. Rig unit using spreader bars.
3. Open the unit only to install water piping system. Do
not remove protective covers from water connections
until piping is ready for attachment. Check water piping to insure cleanliness.
4. Pipe unit using good piping practice (see ASHRAE
handbook section 215 and 195.
5. Check to see that the unit is installed and operated
within limitations (Refer to LIMITATIONS).
The following pages outline detailed procedures to be
followed to install and start-up the chiller.
HANDLING
These units are shipped as completely assembled units
containing full operating charge, and care should be
taken to avoid damage due to rough handling.

10

Immediately upon receiving the unit, it should be inspected for possible damage which may have occurred
during transit. If damage is evident, it should be noted
in the carrier’s freight bill. A written request for inspection by the carrier’s agent should be made at once. See
“Instruction” manual, Form 50.15-NM for more information and details.
LOCATION AND CLEARANCES
These units are designed for outdoor installations on
ground level, rooftop, or beside a building. Location
should be selected for minimum sun exposure and to
insure adequate supply of fresh air for the condenser.
The units must be installed with sufficient clearances
for air entrance to the condenser coil, for air discharge
away from the condenser, and for servicing access.
In installations where winter operation is intended and
snow accumulations are expected, additional height
must be provided to insure normal condenser air flow.
Clearances are listed under “Notes” in the “DIMENSIONS” section.

YORK INTERNATIONAL

FORM 150.62-NM1

FOUNDATION

SPRING ISOLATORS (OPTIONAL)

The unit should be mounted on a flat and level foundation, floor, or rooftop capable of supporting the entire
operating weight of the equipment. See PHYSICAL
DATA for operating weight. If the unit is elevated beyond the normal reach of service personnel, a suitable
catwalk must be capable of supporting service personnel, their equipment, and the compressors.

When ordered, four (4) isolators will be furnished.

GROUND LEVEL LOCATIONS
It is important that the units be installed on a substantial
base that will not settle. A one piece concrete slab with
footers extended below the frost line is highly recommended. Additionally, the slab should not be tied to the
main building foundations as noise and vibration may
be transmitted. Mounting holes are provided in the steel
channel for bolting the unit to its foundation. (See DIMENSIONS.)
For ground level installations, precautions should be
taken to protect the unit from tampering by or injury to
unauthorized persons. Screws and/or latches on access
panels will prevent casual tampering. However, further
safety precautions such as a fenced-in enclosure or
locking devices on the panels may be advisable.
ROOFTOP LOCATIONS
Choose a spot with adequate structural strength to safely
support the entire weight of the unit and service personnel. Care must be taken not to damage the roof.
Consult the building contractor or architect if the roof is
bonded. Roof installations should have wooden beams
(treated to reduce deterioration), cork, rubber, or vibration isolators under the base to minimize vibration.
NOISE SENSITIVE LOCATIONS
Efforts should be made to assure that the chiller is not
located next to occupied spaces or noise sensitive areas where chiller noise level would be a problem. Chiller
noise is a result of compressor and fan operation. Considerations should be made utilizing noise levels published in the YORK Engineering Guide for the specific
chiller model. Sound blankets for the compressors and
low sound fans are available.

YORK INTERNATIONAL

Identify the isolator, and locate at the proper mounting
point, and adjust per instructions. See Appendix 1.

1
COMPRESSOR MOUNTING
The compressors are mounted on four (4) rubber isolators. The mounting bolts should not be loosened or adjusted at installation of the chiller.
REMOTE COOLER OPTION
For units using remote cooler option, refer to instructions included with miscellaneous cooler parts kit.
The unit is shipped with a 6 lb. (2.7 kg) holding charge.
The remainder of the charge must be weighed-in according to the operating charge listed under Physical
Data. Additional charge must also be added for the refrigerant lines.
CHILLED WATER PIPING
General – When the unit has been located in its final
position, the unit water piping may be connected. Normal installation precautions should be observed in order to receive maximum operating efficiencies. Piping
should be kept free of all foreign matter. All chilled water evaporator piping must comply in all respects with
local plumbing codes and ordinances.
Since elbows, tees and valves decrease pump capacity, all piping should be kept as straight and as simple
as possible possible. All piping must be supported
independent of the chiller.

Consideration should be given to compressor access when laying out water
piping. Routing the water piping too
close to the unit could make compressor servicing/replacement difficult.

11

Installation

Hand stop valves should be installed in all lines to facilitate servicing.
Piping to the inlet and outlet connections of the chiller
should include high-pressure rubber hose or piping loops
to insure against transmission of water pump vibration.
The necessary components must be obtained in the
field.
Drain connections should be provided at all low points
to permit complete drainage of the cooler and system
water piping.
A small valve or valves should be installed at the highest point or points in the chilled water piping to allow
any trapped air to be purged. Vent and drain connections should be extended beyond the insulation to make
them accessible.

ter lines.
6. The chilled water lines that are exposed to outdoor
ambients should be wrapped with supplemental
heater cable and insulated to protect against freezeup during low ambient periods, and to prevent formation of condensation on lines in warm humid locations.
7. A chilled water flow switch, (either by YORK or others) MUST be installed in the leaving water piping of
the cooler. There should be a straight horizontal run
of at least 5 diameters on each side of the switch.
Adjust the flow switch paddle to the size of the pipe
in which it is to be installed. (See manufacturer’s instructions furnished with the switch.) The switch is to
be wired to terminals 13 – 14 of CTB1 located in the
control panel, as shown on the unit wiring diagram.

The piping to and from the cooler must be designed to
suit the individual installation. It is important that the
following considerations be observed:
1. The chilled liquid piping system should be laid out so
that the circulating pump discharges directly into the
cooler. The suction for this pump should be taken
from the piping system return line and not the cooler.
This piping scheme is recommended, but is not mandatory.
2. The inlet and outlet cooler connection sizes are 3"
(YCAL0014 - 0030), 4" (YCAL0034 - 0060), or 6"
(YCAL0064 - 0080).
3. A strainer, preferably 40 mesh, must be installed in
the cooler inlet line just ahead of the cooler. This is
important to protect the cooler from entrance of large
particles which could cause damage to the evaporator.
4. All chilled liquid piping should be thoroughly flushed
to free it from foreign material before the system is
placed into operation. Use care not to flush any foreign material into or through the cooler.
5. As an aid to servicing, thermometers and pressure
gauges should be installed in the inlet and outlet wa-

12

The Flow Switch MUST NOT be used
to start and stop the chiller (i.e. starting and stopping the chilled water
pump). It is intended only as a safety
switch.
WIRING
Liquid Chillers are shipped with all factory mounted controls wired for operation.
Field Wiring – Power wiring must be provided through
a fused disconnect switch to the unit terminals (or optional molded disconnect switch) in accordance with
N.E.C. or local code requirements. Minimum circuit
ampacity and maximum dual element fuse size are given
in the Tables 2 – 6.
A 120-1-60, 15 amp source must be supplied for the
control panel through a fused disconnect when a control panel transformer (optional) is not provided. Refer
to Table 1 and Figures 2 - 4.
See Figures 2 - 5 and unit wiring diagrams for field and
power wiring connections, chilled water pump starter
contacts, alarm contacts, compressor run status contacts, PWM input, and load limit input. Refer to section
on UNIT OPERATION for a detailed description of operation concerning aforementioned contacts and inputs.

YORK INTERNATIONAL

FORM 150.62-NM1

EVAPORATOR PUMP START CONTACTS

REMOTE EMERGENCY CUTOFF

Terminal block CTB2 - terminals 23 to 24, are normally
open contacts that can be used to switch field supplied
power to provide a start signal to the evaporator pump
contactor. The contacts will be closed when any of the
following conditions occur:

Immediate shutdown of the chiller can be accomplished
by opening a field installed dry contact to break the electrical circuit between terminals 5 to L on terminal block
CTB2. The unit is shipped with a factory jumper installed
between terminals 5 to L, which must be removed if
emergency shutdown contacts are installed. Refer to
Figure 5 and unit wiring diagram.

1. Low Leaving Chilled Liquid Fault
2. Any compressor is running.
3. Daily schedule is not programmed OFF and the
Unit Switch is ON.

PWM INPUT

The pump will not run if the micropanel has been powered up for less than 30 seconds, or if the pump has
run in the last 30 seconds, to prevent pump motor overheating. Refer to figure 5 and unit wiring diagram.

The PWM input allows reset of the chilled liquid setpoint by supplying a “timed” contact closure. Field wiring should be connected to CTB1 - terminals 13 to 20.
A detailed explanation is provided in the Unit Control
section. Refer to Figure 5 and unit wiring diagram.

SYSTEM RUN CONTACTS

LOAD LIMIT INPUT

Contacts are available to monitor system status.
Normally-open auxiliary contacts from each compressor
contactor are wired in parallel with CTB2 - terminals 25
to 26 for system 1, and CTB2 - terminals 27 to 28 for
system 2 (YCAL0040 - YCAL0080). Refer to Figure 5
and unit wiring diagram.

Load limiting is a feature that prevents the unit from
loading beyond a desired value. The unit can be “load
limited” either 33%, 50%, or 66%, depending on the
number of compressors on unit. The field connections
are wired to CTB1 - terminals 13 to 21, and work in
conjunction with the PWM inputs. A detailed explanation is provided in the Unit Control section. Refer to figure 5 and unit wiring diagram.

ALARM STATUS CONTACTS
Normally-open contacts are available for each refrigerant
system. These normally-open contacts close when the
system if functionally normally. The respective contacts
will open when the unit is shut down on a unit fault, or
locked out on a system fault. Field connections are at
CTB2 terminals 29 to 30 (system 1), and terminals 31 to
32 (system 2 YCAL0040 - YCAL0080).

When using the Load Limit feature,
the PWM feature will not function SIMULTANEOUS OPERATION OF
LOAD LIMITING AND TEMPERATURE RESET (PWM INPUT)
CANNOT BE DONE.

REMOTE START/STOP CONTACTS
FLOW SWITCH INPUT
To remotely start and stop the chiller, dry contacts can
be wired in series with the flow switch and CTB1 - terminals 13 to 14. Refer to Figure 5 and unit wiring diagram.

YORK INTERNATIONAL

The flow switch is field wired to CTB1 terminals 13 - 14.
See Figure 5 and unit wiring diagram.

13

1

Installation

STANDARD POWER SUPPLY WIRING – (0014 - 0080)
Control Panel

Power Panel

2
L

GRD

2L3

2L2

2L1

GRD

1L3

1L2

1L1

Circuit # 1 *Circuit # 2

Micropanel
Flow Switch
CTB2
13 14
CTB1

Field 120-1-60 Micropanel
Power Supply if control
transformer not supplied

Field Unit Power
Supply

See electrical note 9
LD04483

IT IS POSSIBLE THAT MULTIPLE SOURCES OF POWER CAN BE SUPPLYING
THE UNIT POWER PANEL. TO PREVENT SERIOUS INJURY OR DEATH, THE
TECHNICIAN SHOULD VERIFY THAT NO LETHAL VOLTAGES ARE PRESENT
INSIDE THE PANEL AFTER DISCONNECTING POWER, PRIOR TO WORKING ON
EQUIPMENT.

THE UNIT EVAPORATOR HEATER USES 120 VAC. DISCONNECTING 120 VAC
POWER FROM THE UNIT, AT OR BELOW FREEZING TEMPERATURES, CAN
RESULT IN DAMAGE TO THE EVAPORATOR AND UNIT AS A RESULT OF THE
CHILLED LIQUID FREEZING.

Electrical Notes and Legend located on Page 18 and 19.

FIG. 2 – MULTI POINT POWER SUPPLY WIRING
14

YORK INTERNATIONAL

FORM 150.62-NM1

OPTIONAL SINGLE POINT POWER SUPPLY WIRING – (0040 - 0080)
Control Panel

Power Panel

1
2
L

1L3

GRD

1L1

1L2

Micropanel

CTB2

Flow Switch
13 14
CTB1
Field 120-1-60 Micropanel
Power Supply if control
transformer not supplied

Field Unit Power Supply

See electrical note 9
LD04484

IT IS POSSIBLE THAT MULTIPLE SOURCES OF POWER CAN BE SUPPLYING
THE UNIT POWER PANEL. TO PREVENT SERIOUS INJURY OR DEATH, THE
TECHNICIAN SHOULD VERIFY THAT NO LETHAL VOLTAGES ARE PRESENT
INSIDE THE PANEL AFTER DISCONNECTING POWER, PRIOR TO WORKING ON
EQUIPMENT.

THE UNIT EVAPORATOR HEATER USES 120 VAC. DISCONNECTING 120 VAC
POWER FROM THE UNIT, AT OR BELOW FREEZING TEMPERATURES, CAN
RESULT IN DAMAGE TO THE EVAPORATOR AND UNIT AS A RESULT OF THE
CHILLED LIQUID FREEZING.

Electrical Notes and Legend located on Page 18 and 19.

FIG. 3 – OPTIONAL SINGLE POINT POWER SUPPLY WIRING
YORK INTERNATIONAL

15

Installation

OPTIONAL SINGLE-POINT POWER SUPPLY WIRING
N-F DISC SW OR CIRC BKR (0014 - 0080)
Control Panel

Power Panel

2
L
N-F Disconnect
Sw. OR Molded
Case Circuit
Bkr.
1L1 1L2 1L3

GRD

Micropanel

Flow Switch

CTB2
13 14
CTB1

Field 120-1-60 Micropanel
Power Supply if control
transformer not supplied
Field Unit Power
Supply

See electrical note 9

LD04485

IT IS POSSIBLE THAT MULTIPLE SOURCES OF POWER CAN BE SUPPLYING
THE UNIT POWER PANEL. TO PREVENT SERIOUS INJURY OR DEATH, THE
TECHNICIAN SHOULD VERIFY THAT NO LETHAL VOLTAGES ARE PRESENT
INSIDE THE PANEL AFTER DISCONNECTING POWER, PRIOR TO WORKING ON
EQUIPMENT.

THE UNIT EVAPORATOR HEATER USES 120 VAC. DISCONNECTING 120 VAC
POWER FROM THE UNIT, AT OR BELOW FREEZING TEMPERATURES, CAN
RESULT IN DAMAGE TO THE EVAPORATOR AND UNIT AS A RESULT OF THE
CHILLED LIQUID FREEZING.

Electrical Notes and Legend located on Page 18 and 19.

FIG. 4 – OPTIONAL SINGLE POINT POWER WIRING
16

YORK INTERNATIONAL

FORM 150.62-NM1

CONTROL WIRING

FLOW SW

REMOTE START/STOP

13

1

14
13
20
13

PWM INPUT

LOAD LIMIT INPUT

21

CTB1

LD03819

*

* Factory wired with optional transformer.
LD03611

IT IS POSSIBLE THAT MULTIPLE SOURCES OF POWER CAN BE SUPPLYING
THE UNIT POWER PANEL. TO PREVENT SERIOUS INJURY OR DEATH, THE
TECHNICIAN SHOULD VERIFY THAT NO LETHAL VOLTAGES ARE PRESENT
INSIDE THE PANEL AFTER DISCONNECTING POWER, PRIOR TO WORKING ON
EQUIPMENT.

THE UNIT EVAPORATOR HEATER USES 120 VAC. DISCONNECTING 120 VAC
POWER FROM THE UNIT, AT OR BELOW FREEZING TEMPERATURES, CAN
RESULT IN DAMAGE TO THE EVAPORATOR AND UNIT AS A RESULT OF THE
CHILLED LIQUID FREEZING.
FIG. 5 – CONTROL WIRING
YORK INTERNATIONAL

17

Installation

ELECTRICAL NOTES
NOTES:
1. Minimum Circuit Ampacity (MCA) is based on 125% of the rated load amps for the largest motor plus 100% of
the rated load amps for all other loads included in the circuit, per N.E.C. Article 430-24. If the Factory Mounted
Control Transformer is provided, add the following to the system MCA values in the electrical tables for the
system supplying power to the optional transformer. -17, add 2.5 amps; -28, add 2.3 amps; -40, add 1.5 amps, 46, add 1.3 amps; -58, add 1 amp.
2. The minimum recommended disconnect switch is based on 115% of the rated load amps for all loads included in
the circuit, per N.E.C. Article 440.
3. Minimum fuse size is based upon 150% of the rated load amps for the largest motor plus 100% of the rated load
amps for all other loads included in the circuit to avoid nuisance trips at start-up due to lock rotor amps. It is not
recommended in applications where brown outs, frequent starting and stopping of the unit, and/or operation at
ambient temperatures in excess of 95 °F is anticipated.
4. Maximum fuse size is based upon 225% of the rated load amps for the largest motor plus 100% of the rated load
amps for all other loads included in the circuit, per N.E.C. Article 440-22.
5. Circuit breakers must be U.L. listed and CSA certified and maximum size is based on 225% of the rated load
amps for the largest motor plus 100% of the rated load amps for all other loads included in the circuit. Exception:
YCA0014 and YCAL0020 must have the optional factory overloads installed to use a standard circuit breaker.
Otherwise, an HACR-type circuit breakers must be used. Maximum HACR circuit breaker rating is based on
225% of the rated load amps for the largest motor plus 100% of the rated load amps for all other loads included
in the circuit.
6. The “INCOMING WIRE RANGE” is the minimum and maximum wire size that can be accommodated by the unit
wiring lugs. The (2) preceding the wire range indicates the number of termination points available per phase of
the wire range specified. Actual wire size and number of wires per phase must be determined based on the
National Electrical Code, using copper connectors only. Field wiring must also comply with local codes.
7. A ground lug is provided for each compressor system to accommodate a field grounding conductor per N.E.C.
Table 250-95. A control circuit grounding lug is also supplied.
8. The supplied disconnect is a “Disconnecting Means” as defined in the N.E.C. 100, and is intended for isolating
the unit for the available power supply to perform maintenance and troubleshooting. This disconnect is not
intended to be a Load Break Device.
9. Field Wiring by others which complies to the National Electrical Code and Local Codes.

18

YORK INTERNATIONAL

FORM 150.62-NM1

ELECTRICAL NOTES

LEGEND
ACR-LINE
C.B.
D.E.
DISC SW
FACT MOUNT CB
FLA
HZ
MAX
MCA
MIN
MIN NF
RLA
S.P. WIRE
UNIT MTD SERV SW
LRA

1

ACROSS THE LINE START
CIRCUIT BREAKER
DUAL ELEMENT FUSE
DISCONNECT SWITCH
FACTORY MOUNTED CIRCUIT BREAKER
FULL LOAD AMPS
HERTZ
MAXIMUM
MINIMUM CIRCUIT AMPACITY
MINIMUM
MINIMUM NON FUSED
RATED LOAD AMPS
SINGLE POINT WIRING
UNIT MOUNTED SERVICE (NON-FUSED DISCONNECT
SWITCH)
LOCKED ROTOR AMPS

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

LEGEND: Field Wiring
Factory Wiring

YORK INTERNATIONAL

19

Installation

ELECTRICAL DATA
TABLE 1 – MICROPANEL POWER SUPPLY
UNIT VOLTAGE

UNIT VOLTAGE

CONTROL POWER

MCA
NOTE A

MODELS w/o
CONTROL TRANS

MODELS w/
CONTROL TRANS

-17
-28
-40
-46
-58

OVER CURRENT PROTECTION,
SEE NOTE B
MIN
MAX

NF DISC Sw

115-1-60/50

15A

10A

15A

30 A / 240V

200-1-60
230-1-60
380-1-60
460-1-60
575-1-60

15A
15A
15A
15A
15A

10A
10A
10A
10A
10A

15A
15A
15A
15A
15A

30 A / 240V
30 A / 240V
30 A / 480V
30 A / 480V
30 A / 600V

A. Minimum #14 AWG, 75°C, Copper Recommended
B. Minimum and Maximum Over Current Protection, Dual Element Fuse or Circuit Breaker

IT IS POSSIBLE THAT MULTIPLE SOURCES OF POWER CAN BE SUPPLYING
THE UNIT POWER PANEL. TO PREVENT SERIOUS INJURY OR DEATH, THE
TECHNICIAN SHOULD VERIFY THAT NO LETHAL VOLTAGES ARE PRESENT
INSIDE THE PANEL AFTER DISCONNECTING POWER, PRIOR TO WORKING ON
EQUIPMENT.

THE UNIT EVAPORATOR HEATER USES 120 VAC. DISCONNECTING 120 VAC
POWER FROM THE UNIT, AT OR BELOW FREEZING TEMPERATURES, CAN
RESULT IN DAMAGE TO THE EVAPORATOR AND UNIT AS A RESULT OF THE
CHILLED LIQUID FREEZING.

20

YORK INTERNATIONAL

FORM 150.62-NM1

ELECTRICAL DATA – STANDARD SINGLE POINT POWER
YCAL0014SC - YCAL0034SC
TABLE 2 – STANDARD SINGLE POINT POWER
SINGLE POINT FIELD SUPPLIED WIRING
MODEL
MIN N/F
VOLT HZ MCA1
YCAL
DISC SW2

0014SC

0020SC

0024SC

0030SC

0034SC

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

60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60

75
70
42
34
27
100
93
52
45
36
127
118
76
57
46
140
130
75
62
50
183
170
103
81
65

100
100
60
60
30
150
100
60
60
60
150
150
100
60
60
150
150
100
100
60
200
200
150
100
100

D.E. FUSE
MIN3 MAX4
90
100
80
90
45
50
40
40
30
35
110
125
110
125
60
60
50
60
40
45
150
175
150
150
90
100
70
70
50
60
175
175
150
175
90
100
70
80
60
60
200
225
200
200
110
125
90
100
70
80

SYSTEM #1 COMPRESSOR & FAN

CKT. BKR.5
MIN
90
80
45
40
30
110
110
60
50
40
150
150
90
70
50
175
150
90
70
60
200
200
110
90
70

MAX
100
90
50
40
35
125
125
60
60
45
175
150
100
70
60
175
175
100
80
60
225
200
125
100
80

INCOMING
WIRE
RANGE6
#4-#1
#4-#1
#8-#4
# 10 - # 6
# 10 - # 6
# 2 - 1/0
# 2 - 1/0
#6-#2
#8-#4
#8-#4
# 1 - 2/0
# 1 - 2/0
#4-#1
#6-#2
#8-#4
1/0 - 3/0
1/0 - 3/0
#4-#1
#6-#2
#6-#2
3/0 - 250
2/0 - 4/0
# 2 - 1/0
#4-#1
#4-#1

COMPR. #1
RLA
26.0
24.1
14.0
11.5
9.2
37.0
34.3
18.5
16.3
13.1
49.1
45.5
29.5
21.7
17.3
54.7
50.7
28.7
24.1
19.3
51.2
47.4
28.7
22.6
18

LRA
195
195
113
98
80
237
237
154
130
85
298
298
235
170
140
420
420
235
175
140
298
298
235
175
140

COMPR. #2

COMPR. #3

RLA
26.0
24.1
14.0
11.5
9.2
37.0
34.3
18.5
16.3
13.1
49.1
45.5
29.5
21.7
17.3
54.7
50.7
28.7
24.1
19.3
51.2
47.4
28.7
22.6
18

RLA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
51.2
47.4
28.7
22.6
18

LRA
195
195
113
98
80
237
237
154
130
85
298
298
235
170
140
420
420
235
175
140
298
298
235
175
140

1

FANS

LRA QTY FLA (EA)
—
2
8.2
—
2
7.8
—
2
4.8
—
2
3.8
—
2
3.1
—
2
8.2
—
2
7.8
—
2
4.8
—
2
3.8
—
2
3.1
—
2
8.2
—
2
7.8
—
2
4.8
—
2
3.8
—
2
3.1
—
2
8.2
—
2
7.8
—
2
4.8
—
2
3.8
—
2
3.1
298
2
8.2
298
2
7.8
235
2
4.8
175
2
3.8
140
2
3.1

See notes and legend on pages 18 and 19.

YORK INTERNATIONAL

21

Installation

ELECTRICAL DATA – STANDARD DUAL POINT POWER
YCAL0040SC - YCAL0080SC
TABLE 3 – STANDARD DUAL POINT POWER
SYSTEM #1 FIELD SUPPLIED WIRING
MODEL
VOLT HZ MCA1 MIN N/F
YCAL
DISC SW2
200 60 91
100
230 60 85
100
0040SC 380 60 54
60
460 60 41
60
575 60 33
60
200 60 130
150
230 60 121
150
0044SC 380 60 73
100
460 60 58
60
575 60 47
60
200 60 146
200
230 60 136
150
0050SC 380 60 79
100
460 60 65
100
575 60 52
60
200 60 141
150
230 60 131
150
0060SC 380 60 77
100
460 60 63
100
575 60 50
60
200 60 187
200
230 60 174
200
0064SC 380 60 105
150
460 60 83
100
575 60 67
100
200 60 185
200
230 60 172
200
0070SC 380 60 104
150
460 60 82
100
575 60 66
100
200 60 208
250
230 60 193
250
0074SC 380 60 113
150
460 60 92
100
575 60 74
100
200 60 207
250
230 60 192
250
0080SC 380 60 112
150
460 60 92
100
575 60 74
100

D.E. FUSE

CKT. BKR.5

MIN3 MAX4
100 110
100 110
60
70
45
50
40
40
150 175
150 150
80 100
70
70
60
60
175 200
150 175
90 100
80
80
60
70
175 175
150 175
90 100
70
80
60
60
200 225
200 200
125 125
90 100
80
80
200 225
200 200
125 125
90 100
80
80
225 250
225 225
125 125
100 110
80
90
225 250
225 225
125 125
100 110
80
90

MIN MAX
100
110
100
110
60
70
45
50
40
40
150
175
150
150
80
100
70
70
60
60
175
200
150
175
90
100
80
80
60
70
175
175
150
175
90
100
70
80
60
60
200
225
200
200
125
125
90
100
80
80
200
225
200
200
125
125
90
100
80
80
225
250
225
225
125
125
100
110
80
90
225
250
225
225
125
125
100
110
80
90

SYSTEM #1 COMPRESSOR & FAN
INCOMING
WIRE
RANGE6
# 2 - 1/0
#4-#1
#6-#2
#8-#4
# 10 - # 6
# 1 - 2/0
# 1 - 2/0
#4-#1
#6-#2
#8-#4
1/0 - 3/0
1/0 - 3/0
#4-#1
#4-#1
#6-#2
1/0 - 3/0
1/0 - 3/0
#4-#1
#6-#2
#6-#2
3/0 - 250
2/0 - 4/0
# 2 - 1/0
#4-#1
#4-#1
3/0 - 250
2/0 - 4/0
# 2 - 1/0
#4-#1
#4-#1
4/0 - 300
3/0 - 250
# 2 - 1/0
# 2 - 1/0
#4-#1
4/0 - 300
3/0 - 250
# 2 - 1/0
# 2 - 1/0
#4-#1

COMPR. #1
RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
57.4
53.1
30.8
25.3
20.2
55.0
50.9
29.6
24.2
19.4
52.4
48.6
29.3
23.1
18.5
51.8
48.0
29.0
22.9
18.3
58.9
54.5
31.6
26.0
20.8
58.6
54.2
31.5
25.8
20.7

LRA
265
265
155
120
80
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140

COMPR. #2

COMPR. #3

FANS

RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
57.4
53.1
30.8
25.3
20.2
55.0
50.9
29.6
24.2
19.4
52.4
48.6
29.3
23.1
18.5
51.8
48.0
29.0
22.9
18.3
58.9
54.5
31.6
26.0
20.8
58.6
54.2
31.5
25.8
20.7

RLA LRA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
52.4 298
48.6 298
29.3 235
23.1 170
18.5 140
51.8 298
48.0 298
29.0 235
22.9 170
18.3 140
58.9 420
54.5 420
31.6 235
26.0 175
20.8 140
58.6 420
54.2 420
31.5 235
25.8 175
20.7 140

QTY FLA (EA)
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1
2
8.2
2
7.8
2
4.8
2
3.8
2
3.1

LRA
265
265
155
120
80
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140

See notes and legend on pages 18 and 19.

22

YORK INTERNATIONAL

FORM 150.62-NM1

ELECTRICAL DATA – STANDARD DUAL POINT POWER
YCAL0040SC - YCAL0080SC
SYSTEM #2 FIELD SUPPLIED WIRING
MCA1

MIN N/F

D.E. FUSE

DISC SW2 MIN3
91
85
54
41
33
130
121
73
58
47
130
121
73
58
47
141
131
77
63
50
128
119
76
57
46
185
172
104
82
66
181
168
102
80
65
207
192
112
92
74

100
100
60
60
60
150
150
100
60
60
150
150
100
60
60
150
150
100
100
60
150
150
100
100
60
200
200
150
100
100
200
200
150
100
100
250
250
150
100
100

100
100
60
45
40
150
150
80
70
60
150
150
80
70
60
175
150
90
70
60
150
150
90
70
50
200
200
125
90
80
200
200
110
90
70
225
225
125
100
80

YORK INTERNATIONAL

CKT. BRK.5

MAX4

MIN

MAX

110
110
70
50
40
175
150
100
70
60
175
150
100
70
60
175
175
100
80
60
150
150
90
70
50
225
200
125
100
80
225
200
125
100
80
250
225
125
110
90

100
100
60
45
40
150
150
80
70
60
150
150
80
70
60
175
150
90
70
60
150
150
90
70
50
200
200
125
90
80
200
200
110
90
70
225
225
125
100
80

110
110
70
50
40
175
150
100
70
60
175
150
100
70
60
175
175
100
80
60
150
150
90
70
50
225
200
125
100
80
225
200
125
100
80
250
225
125
110
90

SYSTEM #2 COMPRESSOR & FAN
INCOMING
WIRE
RANGE6
# 2 - 1/0
#4-#1
#6-#2
#8-#4
# 10 - # 6
# 1 - 2/0
# 1 - 2/0
#4-#1
#6-#2
#8-#4
# 1 - 2/0
# 1 - 2/0
#4-#1
#6-#2
#8-#4
1/0 - 3/0
1/0 - 3/0
#4-#1
#6-#2
#6-#2
# 1 - 2/0
# 1 - 2/0
#4-#1
# 6-#2
#8-#4
3/0 - 250
2/0 - 4/0
# 2 - 1/0
#4-#1
#4-#1
3/0 - 250
2/0 - 4/0
# 2 - 1/0
#4-#1
#6-#2
4/0 - 300
3/0 - 250
# 2 - 1/0
# 2 - 1/0
#4-#1

COMPR. #1
RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
49.5
45.9
27.8
21.8
17.5
55.0
50.9
29.6
24.2
19.4
34.2
31.6
20.2
15.1
12.0
51.8
48.0
29.0
22.9
18.3
50.5
46.8
28.3
22.3
17.8
58.6
54.2
31.5
25.8
20.7

LRA
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140

COMPR. #2
RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
49.5
45.9
27.8
21.8
17.5
55.0
50.9
29.6
24.2
19.4
34.2
31.6
20.2
15.1
12.0
51.8
48.0
29.0
22.9
18.3
50.5
46.8
28.3
22.3
17.8
58.6
54.2
31.5
25.8
20.7

LRA
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140

COMPR. #3
RLA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
34.2
31.6
20.2
15.1
12.0
51.8
48.0
29.0
22.9
18.3
50.5
46.8
28.3
22.3
17.8
58.6
54.2
31.5
25.8
20.7

1

FANS

LRA QTY FLA (EA)
—
2
8.2
—
2
7.8
—
2
4.8
—
2
3.8
—
2
3.1
—
2
8.2
—
2
7.8
—
2
4.8
—
2
3.8
—
2
3.1
—
2
8.2
—
2
7.8
—
2
4.8
–
2
3.8
—
2
3.1
—
2
8.2
—
2
7.8
—
2
4.8
—
2
3.8
—
2
3.1
265
2
8.2
265
2
7.8
155
2
4.8
120
2
3.8
80
2
3.1
298
2
8.2
298
2
7.8
235
2
4.8
170
2
3.8
140
2
3.1
298
2
8.2
298
2
7.8
235
2
4.8
170
2
3.8
140
2
3.1
420
2
8.2
420
2
7.8
235
2
4.8
175
2
3.8
140
2
3.1

23

Installation

ELECTRICAL DATA – OPTIONAL SINGLE POINT POWER
YCAL0014SC - YCAL0034SC
TABLE 4 – OPTIONAL SINGLE POINT POWER
SINGLE POINT FIELD SUPPLIED WIRING
MODEL
YCAL

0014SC

0020SC

0024SC

0030SC

0034SC

VOLT
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575

HZ
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60

1

MCA

MIN N/F
DISC SW2

75
70
42
34
27
100
93
52
45
36
127
118
76
57
46
140
130
75
62
50
183
170
103
81
65

100
100
60
60
30
150
100
60
60
60
150
150
100
60
60
150
150
100
100
60
200
200
150
100
100

D.E. FUSE
MIN3
90
80
45
40
30
110
110
60
50
40
150
150
90
70
50
175
150
90
70
60
200
200
110
90
70

MAX4
100
90
50
40
35
125
125
60
60
45
175
150
100
70
60
175
175
100
80
60
225
200
125
100
80

CKT. BKR.5
MIN
90
80
45
40
30
110
110
60
50
40
150
150
90
70
50
175
150
90
70
60
200
200
110
90
70

MAX
100
90
50
40
35
125
125
60
60
45
175
150
100
70
60
175
175
100
80
60
225
200
125
100
80

INCOMING WIRE RANGE6
FACTORY SUPPLIED OPTIONAL
DISCONNECT
BREAKER
#4-#1
#4-#1
#4-#1
#4-#1
#8-#4
#8-#4
# 10 - # 6
# 10 - # 6
# 10 - # 6
# 10 - # 6
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
#6-#2
#6-#2
#8-#4
#8-#4
#8-#4
#8-#4
# 1 - 2/0
# 1 - 2/0
# 1 - 2/0
# 1 - 2/0
#4-#1
#4-#1
#6-#2
#6-#2
#8-#4
#8-#4
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0
#4-#1
#4-#1
#6-#2
#6-#2
#6-#2
#6-#2
3/0 - 250
3/0 - 250
2/0 - 4/0
2/0 - 4/0
# 2 - 1/0
# 2 - 1/0
#4-#1
#4-#1
#4-#1
#4-#1

See notes and legend on pages 18 and 19.

24

YORK INTERNATIONAL

FORM 150.62-NM1

ELECTRICAL DATA – OPTIONAL SINGLE POINT POWER
YCAL0014SC - YCAL0034SC
SYSTEM #1 COMPRESSOR & FAN
COMPR. #1
RLA LRA
26.0 195
24.1 195
14.0 113
11.5
98
9.2
80
37.0 237
34.3 237
18.5 154
16.3 130
13.1
85
49.1 298
45.5 298
29.5 235
21.7 170
17.3 140
54.7 420
50.7 420
28.7 235
24.1 175
19.3 140
51.2 298
47.4 298
28.7 235
22.6 175
18
140

COMPR. #2
RLA
LRA
26.0 195
24.1 195
14.0
113
11.5
98
9.2
80
37.0 237
34.3 237
18.5 154
16.3 130
13.1
85
49.1 298
45.5 298
29.5 235
21.7 170
17.3 140
54.7 420
50.7 420
28.7 235
24.1 175
19.3 140
51.2 298
47.4 298
28.7 235
22.6 175
18
140

YORK INTERNATIONAL

COMPR. #3
RLA
LRA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
51.2 298
47.4 298
28.7 235
22.6 175
18
140

QTY
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

1

FANS
FLA (EA)
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1

25

Installation

ELECTRICAL DATA – OPTIONAL SINGLE POINT POWER
YCAL0040SC - YCAL0060SC
TABLE 5 – OPTIONAL SINGLE POINT POWER
SINGLE POINT FIELD SUPPLIED WIRING
MODEL
YCAL

0040SC

0044SC

0050SC

0060SC

VOLT
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575

HZ
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60

1

MCA
173
161
102
77
62
247
229
139
110
88
261
243
145
116
93
267
248
145
119
95

MIN N/F
DISC SW2
200
200
150
100
100
400
250
200
150
100
400
400
200
150
150
400
400
200
150
150

D.E. FUSE
MIN3
200
175
110
90
70
300
250
150
125
100
300
300
175
125
100
300
300
175
125
100

MAX4
200
175
110
90
70
300
250
150
125
100
300
300
175
125
110
300
300
175
125
110

CKT. BKR.5
MIN
200
175
110
90
70
300
250
150
125
100
300
300
175
125
100
300
300
175
125
100

MAX
200
175
110
90
70
300
250
150
125
100
300
300
175
125
110
300
300
175
125
110

INCOMING WIRE RANGE6
FACTORY SUPPLIED OPTIONAL
SINGLE POINT DISCONNECT BREAKER
2/0 - 4/0
2/0 - 4/0
2/0 - 4/0
2/0 - 4/0
2/0 - 4/0
2/0 - 4/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
#4-#1
#4-#1
#4-#1
#6-#2
#6-#2
#6-#2
250 - 350
250 - 350
250 - 350
4/0 - 300
4/0 - 300
4/0 - 300
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
300 - 400
300 - 400
300 - 400
250 - 350
250 - 350
250 - 350
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0
# 1 - 2/0
# 1 - 2/0
# 1 - 2/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
300 - 400
300 - 400
300 - 400
250 - 350
250 - 350
250 - 350
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0
# 1 - 2/0
# 1 - 2/0
# 1 - 2/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0

See notes and legend on pages 18 and 19.

26

YORK INTERNATIONAL

FORM 150.62-NM1

ELECTRICAL DATA – OPTIONAL SINGLE POINT POWER
YCAL0040SC - YCAL0060SC
SYSTEM #1 COMPRESSOR & FAN
COMPR. #1
RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
57.4
53.1
30.8
25.3
20.2
55.0
50.9
29.6
24.2
19.4

LRA
265
265
155
120
80
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140

COMPR. #2
RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
57.4
53.1
30.8
25.3
20.2
55.0
50.9
29.6
24.2
19.4

YORK INTERNATIONAL

LRA
265
265
155
120
80
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140

SYSTEM #2 COMPRESSOR & FAN

COMPR. #3
RLA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

LRA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

FANS
QTY
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

FLA (EA)
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1

COMPR. #1
RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
49.5
45.9
27.8
21.8
17.5
55.0
50.9
29.6
24.2
19.4

LRA
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140

COMPR. #2
RLA
32.9
30.5
19.4
14.5
11.6
50.2
46.5
28.1
22.1
17.7
49.5
45.9
27.8
21.8
17.5
55.0
50.9
29.6
24.2
19.4

LRA
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140

COMPR. #3
RLA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

LRA
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

1

FANS
QTY
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

FLA (EA)
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1

27

Installation

ELECTRICAL DATA – OPTIONAL SINGLE POINT POWER
YCAL0064SC - YCAL0080SC
TABLE 6 – OPTIONAL SINGLE POINT POWER
SINGLE POINT FIELD SUPPLIED WIRING
MODEL
YCAL

0064SC

0070SC

0074SC

0080SC

VOLT
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575
200
230
380
460
575

HZ
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60
60

1

MCA

MIN N/F
DISC SW2

306
284
175
136
109
357
332
201
159
127
376
349
207
167
134
399
371
216
177
142

400
400
200
150
150
400
400
250
200
150
600
400
250
200
150
600
600
250
200
200

D.E. FUSE
MIN3
350
300
200
150
125
400
350
225
175
150
400
400
225
175
150
450
400
225
200
150

MAX4
350
300
200
150
125
400
350
225
175
150
400
400
225
175
150
450
400
225
200
150

CKT. BKR.5
MIN
350
300
200
150
125
400
350
225
175
150
400
400
225
175
150
450
400
225
200
150

MAX
350
300
200
150
125
400
350
225
175
150
400
400
225
175
150
450
400
225
200
150

INCOMING WIRE RANGE6
FACTORY SUPPLIED OPTIONAL
SINGLE POINT DISCONNECT BREAKER
350 - 500
350 - 500
350 - 500
300 - 400
300 - 400
300 - 400
3/0 - 250
3/0 - 250
3/0 - 250
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0
# 2 - 1/0
# 2 - 1/0
# 2 - 1/0
500 - (2) 4/0
500 - (2) 4/0
500 - (2) 4/0
400 - 600
400 - 600
400 - 600
4/0 - 300
4/0 - 300
4/0 - 300
2/0 - 4/0
2/0 - 4/0
2/0 - 4/0
# 1 - 2/0
# 1 - 2/0
# 1 - 2/0
500 - (2) 4/0
500 - (2) 4/0
500 - (2) 4/0
500 - (2) 4/0
500 - (2) 4/0
500 - (2) 4/0
4/0 - 300
4/0 - 300
4/0 - 300
2/0 - 4/0
2/0 - 4/0
2/0 - 4/0
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0
600 - (2) 250
600 - (2) 250 600 - (2) 250
500 - (2) 4/0
500 - (2) 4/0
500 - (2) 4/0
4/0 - 300
4/0 - 300
4/0 - 300
3/0 - 250
3/0 - 250
3/0 - 250
1/0 - 3/0
1/0 - 3/0
1/0 - 3/0

See notes and legend on pages 18 and 19.

28

YORK INTERNATIONAL

FORM 150.62-NM1

ELECTRICAL DATA – OPTIONAL SINGLE POINT POWER
YCAL0064SC - YCAL0080SC
SYSTEM #1 COMPRESSOR & FAN
COMPR. #1
RLA
52.4
48.6
29.3
23.1
18.5
51.8
48.0
29.0
22.9
18.3
58.9
54.5
31.6
26.0
20.8
58.6
54.2
31.5
25.8
20.7

LRA
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140

COMPR. #2

COMPR. #3

RLA
52.4
48.6
29.3
23.1
18.5
51.8
48.0
29.0
22.9
18.3
58.9
54.5
31.6
26.0
20.8
58.6
54.2
31.5
25.8
20.7

RLA
52.4
48.6
29.3
23.1
18.5
51.8
48.0
29.0
22.9
18.3
58.9
54.5
31.6
26.0
20.8
58.6
54.2
31.5
25.8
20.7

YORK INTERNATIONAL

LRA
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140

LRA
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140
420
420
235
175
140

SYSTEM #2 COMPRESSOR & FAN
FANS
QTY
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

FLA (EA)
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1

COMPR. #1
RLA
34.2
31.6
20.2
15.1
12.0
51.8
48.0
29.0
22.9
18.3
50.5
46.8
28.3
22.3
17.8
58.6
54.2
31.5
25.8
20.7

LRA
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140

COMPR. #2
RLA
34.2
31.6
20.2
15.1
12.0
51.8
48.0
29.0
22.9
18.3
50.5
46.8
28.3
22.3
17.8
58.6
54.2
31.5
25.8
20.7

LRA
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140

COMPR. #3
RLA
34.2
31.6
20.2
15.1
12.0
51.8
48.0
29.0
22.9
18.3
50.5
46.8
28.3
22.3
17.8
58.6
54.2
31.5
25.8
20.7

LRA
265
265
155
120
80
298
298
235
170
140
298
298
235
170
140
420
420
235
175
140

1

FANS
QTY
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

FLA (EA)
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1
8.2
7.8
4.8
3.8
3.1

29

Installation

OPERATIONAL LIMITATIONS (ENGLISH)
TABLE 7 – TEMPERATURES AND FLOWS
YCAL00
14SC
20SC
24SC
30SC
34SC
40SC
44SC
50SC
60SC
64SC
70SC
74SC
80SC

LEAVING WATER
TEMPERATURE (°F )
MAX2
MIN1
40
55
40
55
40
55
40
55
40
55
40
55
40
55
40
55
40
55
40
55
40
55
40
55
40
55

COOLER FLOW (GPM3)
MIN
30
30
35
45
75
75
75
75
75
130
130
130
120

MIN4
25
25
25
25
25
25
25
25
25
25
25
25
25

MAX
60
60
70
75
110
250
250
250
250
390
390
390
430

VOLTAGE LIMITATIONS
The following voltage limitations are absolute and operation beyond these limitations may cause serious damage to the compressor.

AIR ON CONDENSER (°F)
MAX5
125
125
125
125
125
125
125
125
125
125
125
125
125

Excessive flow will cause damage to
the cooler. Do not exceed max. cooler
flow. Special care should be taken
when multiple chillers are fed by a
single pump.

TABLE 8 – VOLTAGES
UNIT POWER
200-3-60
230-3-60
380-3-60
460-3-60
575-3-60

MIN.
180
207
355
414
517

MAX.
220
253
415
506
633

NOTES:
1. Standard units cannot be operated below 40°F leaving chilled water temperature.
2. For leaving water temperature higher than 55°F, contact the nearest YORK Office for application guidelines.
3. The evaporator is protected against freeze-up to -20.0°F with an electrical heater as standard.
4. Operation below 25°F requires Optional Low Ambient Kit for operation to 0°F.
5. Operation above 115°F requires Optional High Ambient Kit for operation to 125°F.

30

YORK INTERNATIONAL

FORM 150.62-NM1

OPERATIONAL LIMITATIONS (ENGLISH)

Cooler Pressure Drop
YCAL0030

1

60.00

Press. Drop, Ft. H2O

50.00
40.00
30.00
20.00
10.00
0.00
10

20

30

50

40

60

90

80

70

100

110

120

130

140

150

Flow, GPM
LD04966

Cooler Pressure Drop
YCAL0034

Press. Drop, Ft. H2O

40.00
30.00
20.00
10.00
0.00

10

20

30

40

50

60

70

90

80

100

110

120

130

150

140

Flow, GPM

TABLE 9 – COOLER PRESSURE DROP CURVES
MODEL YCAL00
14SC, 20SC,
24SC
30SC
34SC
40SC, 44SC, 50SC,
60SC
64SC, 70SC, 74SC
80SC

YORK INTERNATIONAL

COOLER CURVE
A
B
NEW
NEW
C
D
E

LD04967

TABLE 10 – ETHYLENE GLYCOL CORRECTION
FACTORS
% WT
ETHYLENE
GLYCOL TONS
10
20
30
40
50

.994
.986
.979
.970
.959

FACTORS
COMPR.
kW
.997
.993
.990
.985
.980

DELTA
P
1.03
1.06
1.09
1.13
1.16

GPM/° F/
TON
24.1
24.9
25.9
27.3
29.0

FREEZE
POINT
(° F)
26
16
5
-10
-32

31

Installation

OPERATIONAL LIMITATIONS (METRIC)
TABLE 11 – TEMPERATURES AND FLOWS
YCAL00
14SC
20SC
24SC
30SC
34SC
40SC
44SC
50SC
60SC
64SC
70SC
74SC
80SC

LEAVING WATER
TEMPERATURE (°C)
MAX2
MIN1
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8
4.4
12.8

COOLER FLOW (L/S)
MIN
1.9
1.9
2.2
2.8
4.7
4.7
4.7
4.7
4.7
8.2
8.2
8.2
7.6

AIR ON CONDENSER (°C)
MIN4
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9
-3.9

MAX
3.8
3.8
4.4
4.7
6.9
15.8
15.8
15.8
15.8
24.6
24.6
24.6
27.1

VOLTAGE LIMITATIONS
The following voltage limitations are absolute and operation beyond these limitations may cause serious
damage to the compressor.

MAX5
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7
51.7

Excessive flow will cause damage to
the cooler. Do not exceed max. cooler
flow. Special care should be taken
when multiple chillers are fed by a
single pump.

TABLE 12 – VOLTAGES
UNIT POWER
200-3-60
230-3-60
380-3-60
460-3-60
575-3-60

MIN.
180
207
355
414
517

MAX.
220
253
415
506
633

NOTES:
1. Standard units cannot be operated below 4.4°C leaving chilled water temperature.
2. For leaving water temperature higher than 12.8°C, contact the nearest YORK Office for application guidelines.
3. The evaporator is protected against freeze-up to -28.9°C with an electrical heater as standard.
4. Operation below -3.9°C requires Optional Low Ambient Kit for operation to -17.8 °C.
5. Operation above 46.1°C requires Optional High Ambient Kit for operation to 51.7°C.

32

YORK INTERNATIONAL

1

FORM 150.62-NM1

OPERATIONAL LIMITATIONS (METRIC)
Cooler Press. Drop
YCAL0030

180
160

Press. Drop, kPa

140
120
100
80
60
40
20
0

0

10

5
Flow l/s

LD04968

Cooler Pressure Drop
YCAL0034
100
90

Press. Drop, kPa

80
70
60
50
40
30
20
10

3

4

5

6

9

8

7

10

Flow l/s
LD04969

TABLE 13 – COOLER PRESSURE DROP CURVES
MODEL YCAL00
14SC, 20SC, 24SC,
30SC
34SC
40SC, 44SC, 50SC,
60SC
64SC, 70SC, 74SC,
80SC

YORK INTERNATIONAL

COOLER CURVE
A
B
C
D
E

TABLE 14 – ETHYLENE GLYCOL CORRECTION
FACTORS
% WT
ETHYLENE
GLYCOL
10
20
30
40
50

FACTORS
TONS
.994
.986
.979
.970
.959

COMPR.
kW
.997
.993
.990
.985
.980

DELTA
P
1.03
1.06
1.09
1.13
1.16

GPM/° F/
TON
24.1
24.9
25.9
27.3
29.0

FREEZE
POINT
(° C)
-3
-9
-15
-23
-36

33

Installation

PHYSICAL DATA (ENGLISH)
YCAL0014SC - YCAL0080SC
TABLE 15 – PHYSICAL DATA (ENGLISH)
Model YCAL00
Nominal Tons
Number of Refrigerant Circuits
Compressors per circuit
Compressors per unit
Condenser
Total Face Area ft2
Number of Rows
Fins per Inch
Condenser Fans
Number of Fans total
Fan hp/kw
Fan RPM
Number of Blades
Total Chiller CFM
Evaporator, Direct Expansion
Diameter x Length
Water Volume, gallons
Maximum Water Side Pressure, PSIG
Maximum Refrigerant Side Pressure, PSIG
Minimum Chiller Water Flow Rate, gpm
Maximum Chiller Water Flow Rate, gpm
Water Connections, inches
Shipping Weight
Aluminum Fin Coils, lbs
Copper Fin Coils, lbs
Operating Weight
Aluminum Fin Coils, lbs
Copper Fin Coils, lbs
Refrigerant Charge, R22, ckt1 / ckt2, lbs
Oil Charge, ckt1 / ckt2, gallons

34

14SC
13.6
1
2
2

20SC
17.9
1
2
2

24SC
23.3
1
2
2

30SC
27.1
1
2
2

34SC
34.7
1
3
3

40SC
38.2
2
2
4

44SC
47.4
2
2
4

47.2
2
14

47.2
2
14

66.1
2
14

66.1
3
14

66.1
3
14

128.0
2
14

128.0
2
14

2
2 / 1.4
1140
3
16257

2
2 / 1.4
1140
3
16257

2
2 / 1.4
1140
3
23500

2
2 / 1.4
1140
3
23500

2
2 / 1.4
1140
3
23500

4
2 / 1.4
1140
3
47360

4
2 / 1.4
1140
3
47360

8"x6'
9.6
150
300
30
60
3

8"x6'
9.6
150
300
30
60
3

8"x6.5'
9.6
150
300
35
70
3

8"x7'
10.8
150
300
45
75
3

10"x7'
12
150
300
75
110
4

11"x8'
24
150
300
75
250
4

11"x8'
24
150
300
75
250
4

2152
2319

2168
2329

2356
2540

2560
2860

3007
3358

4123
4510

4222
4610

2225
2392
32
1.7

2241
2402
38
1.7

2435
2619
58
2.1

2647
2947
65
3.5

3117
3468
69
3.2

4363
4750
45/45
2.0/2.0

4462
4850
54/54
2.1/2.1

YORK INTERNATIONAL

FORM 150.62-NM1

PHYSICAL DATA (ENGLISH)
YCAL0014SC - YCAL0080SC
50SC
49.9
2
2
4

60SC
54.0
2
2
4

64SC
62.4
2
3
6

70SC
69.4
2
3
6

74SC
74.0
2
3
6

80SC
79.1
2
3
6

128.0
2
14

128.0
3
14

149.3
2
14

149.3
2
16

149.3
3
12

149.3
3
14

4
2 / 1.4
1140
3
47360

4
2 / 1.4
1140
3
46080

4
2 / 1.7
1140
3
55253

4
2 / 1.7
1140
3
55253

4
2 / 1.7
1140
3
54550

4
2 / 1.7
1140
3
53760

11"x8'
24
150
300
75
250
4

11"x8'
24
150
300
75
250
4

14"x8'
41
150
300
130
390
6

14"x8'
41
150
300
130
390
6

14"x8'
41
150
300
130
390
6

14"x8'
38
150
300
120
430
6

4300
4688

4596
5275

5207
5735

5322
5925

5569
6247

5819
6611

4540
4928
60/54
3.5/2.1

4836
5515
72/72
3.5/3.5

5501
6029
75/62
3.2/3.0

5616
6219
75/75
3.2/3.2

5863
6541
92/83
5.2/3.2

6128
6919
100/100
5.2/5.2

YORK INTERNATIONAL

1

35

Installation

PHYSICAL DATA (METRIC)
YCAL0014SC - YCAL0080SC
TABLE 16 – PHYSICAL DATA (METRIC)
Model YCAL00
Nominal kW
Number of Refrigerant Circuits
Compressors per circuit
Compressors per unit
Condenser
Total Face Area meters2
Number of Rows
Fins per mm
Condenser Fans
Number of Fans total
Fan hp/kw
Fan RPM
Number of Blades
Total Chiller Airflow l/s
Evaporator, Direct Expansion
Diameter x Length
Water Volume, liters
Maximum Water Side Pressure, bar
Maximum Refrigerant Side Pressure, bar
Minimum Chiller Water Flow Rate, l/s
Maximum Chiller Water Flow Rate, l/s
Water Connections, inches
Shipping Weight
Aluminum Fin Coils, kg
Copper Fin Coils, kg
Operating Weight
Aluminum Fin Coils, kg
Copper Fin Coils, kg
Refrigerant Charge, R22, ckt1 / ckt2, kg
Oil Charge, ckt1 / ckt2, liters

36

14SC
46.8
1
2
2

20SC
63.0
1
2
2

24SC
82.0
1
2
2

30SC
95.3
1
2
2

34SC
121.9
1
3
3

40SC
135.6
2
2
4

44SC
168.0
2
2
4

4
2
518

4
2
518

6
2
518

6
3
518

6
3
518

12
2
518

12
2
518

2
2 / 1.4
1140
3
7672

2
2 / 1.4
1140
3
7672

2
2 / 1.4
1140
3
11091

2
2 / 1.4
1140
3
11091

2
2 / 1.4
1140
3
11091

4
2 / 1.4
1140
3
22351

4
2 / 1.4
1140
3
22351

203x1829
36
10
21
2
4
3

203x1830
36
10
21
2
4
3

203x1981
36
10
21
2
4
3

203x2134
41
10
21
3
5
3

254x2134
45
10
21
5
7
4

279x2438
91
10
21
5
16
4

279x2438
91
10
21
5
16
4

976
1052

983
1057

1069
1152

1161
1297

1364
1523

1870
2046

1915
2091

1009
1085
15
6

1016
1090
17
6

1104
1188
24
8

1201
1337
30
13

1414
1573
31
12

1979
2155
21/21
8.0/8.0

2024
2200
25/25
8.0/8.0

YORK INTERNATIONAL

FORM 150.62-NM1

PHYSICAL DATA (METRIC)
YCAL0014SC - YCAL0080SC
50SC
177.1
2
2
4

60SC
191.6
2
2
4

64SC
221.3
2
3
6

70SC
246.0
2
3
6

74SC
262.6
2
3
6

80SC
278.1
2
3
6

12
2
518

12
3
518

14
2
518

14
2
518

14
3
518

14
3
518

4
2 / 1.4
1140
3
22351

4
2 / 1.4
1140
3
21747

4
2 / 1.7
1140
3
26076

4
2 / 1.7
1140
3
26076

4
2 / 1.7
1140
3
25744

4
2 / 1.7
1140
3
25371

279x2438
91
10
21
5
16
4

279x2438
91
10
21
5
16
4

356x2438
155
10
21
8
25
6

356x2438
155
10
21
8
25
6

356x2438
155
10
21
8
25
6

356x2438
144
10
21
8
27
6

1950
2126

2085
2393

2362
2601

2414
2687

2526
2834

2640
2999

2059
2235
27/25
13/8

2194
2502
33/33
13/13

2495
2735
34/28
12/11.4

2547
2821
34/34
12.0/12.0

2659
2967
42/38
20/12

2780
3138
46/46
20/20

YORK INTERNATIONAL

1

37

Installation

DIMENSIONS (ENGLISH)
YCAL0014SC - YCAL0020SC

LD03848

Placement on a level surface of free of obstructions (including snow, for winter operation) or air circulation ensures rated
performance, reliable operation, and ease of maintenance. Site restrictions may compromise minimum clearances indicated
below, resulting in unpredictable airflow patterns and possible diminished performance. YORK’s unit controls will optimize
operation without nuisance high-pressure safety cutouts; however, the system designer must consider potential performance
degradation. Access to the unit control center assumes the unit is no higher than on spring isolators. Recommended minimum clearances: Side to wall – 6'; rear to wall – 6'; control panel to end wall – 4'0; top – no obstructions allowed; distance
between adjacent units – 10'. No more than one adjacent wall may be higher than the unit.

38

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (ENGLISH)
YCAL0014SC - YCAL0020SC

1

LD03847

TABLE 17 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
14SC
20SC

A
587
591

YORK INTERNATIONAL

B
525
529

WEIGHT DISTRIBUTION
C
D
587
525
591
529

TOTAL
2225
2241

X
50.1
50.2

CENTER OF GRAVITY
Y
Z
25.8
23.3
25.9
23.2

39

Installation

DIMENSIONS (ENGLISH)
YCAL0024SC - YCAL0034SC

LD03846

* Refers to Model YCAL0030SC
** Refers to Model YCAL0034SC

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

40

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (ENGLISH)
YCAL0024SC - YCAL0034SC

1

LD03845

TABLE 18 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
24SC
30SC
34SC

A
636
692
868

YORK INTERNATIONAL

B
581
632
690

WEIGHT DISTRIBUTION
C
D
636
581
692
632
868
690

TOTAL
2435
2647
3129

X
50.6
50.6
48.0

CENTER OF GRAVITY
Y
Z
25.9
28.5
25.8
28.9
25.4
26.9

41

Installation

DIMENSIONS (ENGLISH)
YCAL0040SC - YCAL0060SC

LD03850

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

42

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (ENGLISH)
YCAL0040SC - YCAL0060SC

1

LD03849

TABLE 19 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
40SC
44SC
50SC
60SC

A
1110
1133
1151
1217

YORK INTERNATIONAL

B
1071
1098
1119
1201

WEIGHT DISTRIBUTION
C
D
1110
1071
1133
1098
1151
1119
1217
1201

TOTAL
4363
4462
4540
4836

X
58.6
58.7
58.8
59.2

CENTER OF GRAVITY
Y
Z
40.3
28.9
40.3
28.6
40.5
28.4
40.3
29.9

43

Installation

DIMENSIONS (ENGLISH)
YCAL0064SC - YCAL0080SC

LD03852

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

44

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (ENGLISH)
YCAL0064SC - YCAL0080SC

1

LD03851

TABLE 20 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
64SC
70SC
74SC
80SC

A
1463
1492
1551
1620

YORK INTERNATIONAL

B
1288
1315
1380
1444

WEIGHT DISTRIBUTION
C
D
1463
1288
1492
1315
1551
1380
1620
1444

TOTAL
5501
5616
5863
6128

X
56.3
56.3
56.5
56.6

CENTER OF GRAVITY
Y
Z
46.0
30.1
45.6
30.1
45.9
31.0
45.6
30.8

45

Installation

DIMENSIONS (METRIC)
YCAL0014SC - YCAL0020SC

LD03854

All dimensions in millimeters unless otherwise noted.

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

46

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (METRIC)
YCAL0014SC - YCAL0020SC

1

LD03853

All dimensions in millimeters unless otherwise noted.

TABLE 21 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
14SC
20SC

A
266
268

YORK INTERNATIONAL

WEIGHT DISTRIBUTION (kg)
B
C
D
238
266
238
240
268
240

TOTAL
1009
1016

CENTER OF GRAVITY (mm)
X
Y
Z
1273
655
592
1275
658
589

47

Installation

DIMENSIONS (METRIC)
YCAL0024SC - YCAL0034SC

LD03856

All dimensions in millimeters unless otherwise noted.

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

48

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (METRIC)
YCAL0024SC - YCAL0034SC

1

LD03855

All dimensions in millimeters unless otherwise noted.

TABLE 22 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
24SC
30SC
34SC

A
288
314
390

YORK INTERNATIONAL

B
264
287
317

WEIGHT DISTRIBUTION
C
D
288
264
314
287
390
317

TOTAL
1104
1201
1414

X
1285
1285
1219

CENTER OF GRAVITY
Y
Z
658
724
655
734
645
683

49

Installation

DIMENSIONS (METRIC)
YCAL0040SC - YCAL0060SC

LD03858

All dimensions in millimeters unless otherwise noted.

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

50

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (METRIC)
YCAL0040SC - YCAL0060SC

1

LD03857

All dimensions in millimeters unless otherwise noted.

TABLE 23 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
40SC
44SC
50SC
60SC

A
503
514
522
552

YORK INTERNATIONAL

B
486
498
508
545

WEIGHT DISTRIBUTION
C
D
503
486
514
498
522
508
552
545

TOTAL
1979
2024
2059
2194

X
1488
1491
1494
1504

CENTER OF GRAVITY
Y
Z
1024
734
1024
726
1029
721
1024
759

51

Installation

DIMENSIONS (METRIC)
YCAL0064SC - YCAL0080SC

LD03860

All dimensions in millimeters unless otherwise noted.

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

52

YORK INTERNATIONAL

FORM 150.62-NM1

DIMENSIONS (METRIC)
YCAL0064SC - YCAL0080SC

1

LD03859

All dimensions in millimeters unless otherwise noted.

TABLE 24 – WEIGHT DISTRIBUTION/CENTER OF GRAVITY
MODEL
YCAL00
64SC
70SC
74SC
80SC

A
664
677
704
735

YORK INTERNATIONAL

B
584
596
626
655

WEIGHT DISTRIBUTION
C
D
664
584
677
596
704
626
735
655

TOTAL
2495
2547
2659
2780

X
1430
1430
1435
1438

CENTER OF GRAVITY
Y
Z
1168
765
1158
765
1166
787
1158
782

53

Installation

PRE-STARTUP CHECKLIST
JOB NAME: ______________________________
SALES ORDER #: _________________________
LOCATION: _______________________________
SOLD BY: ________________________________
INSTALLING
CONTRACTOR: ___________________________
START-UP
TECHNICIAN/
COMPANY: _______________________________
START-UP DATE : _________________________

CHILLER MODEL #: _______________________
SERIAL #: ________________________________
CHECKING THE SYSTEM
PRIOR TO INITIAL START (NO POWER)
Unit Checks
G 1. Inspect the unit for shipping or installation
damage.
G 2. Assure that all piping has been completed.
G 3. Visually check for refrigerant piping leaks.
G 4. Open suction line ball valve, discharge line
ballvalve, and liquid line valve for each system.
G 5.The compressor oil level should be maintained so
that an oil level is visible in the sight glass.The oil
level can only be tested when the compressor is
running in stabilized conditions, guaranteeing that
there is no liquid refrigerant in the lower shell of
the compressor. In this case, the oil should be
between 1/4 and 3/4 in the sight glass. At shutdown, the oil level can fall to the bottom limit of
the oil sight glass.
G 6. Assure water pumps are on. Check and adjust
water pump flow rate and pressure drop across
the cooler (see LIMITATIONS). Verify flow switch
operation.

Excessive flow may cause catastrophic
damage to the evaporator.

G 7. Check the control panel to assure it is free of
foreign material (wires, metal chips, etc.).

54

G 8. Visually inspect wiring (power and control). Wiring MUST meet N.E.C. and local codes. See Figures 2- 5, pages 14 - 17.
G 9. Check tightness of power wiring inside the power
panel on both sides of the motor contactors and
overloads.
G10. Check for proper size fuses in main and control
circuits, and verify overload setting corresponds
with RLA and FLA values in electrical tables.
G11. Assure 120VAC Control Power to CTB2 has 15
AMP minimum capacity. See Table 1, page 20.
G12. Be certain all water temp sensors are inserted
completely in their respective wells and are
coated with heat conductive compound.
G13. Assure that evaporator TXV bulbs are strapped
onto the suction lines at 4 or 8 o’clock positions.
PANEL CHECKS
(POWER ON – BOTH UNIT SWITCH OFF)
G 1. Apply 3-phase power and verify its value. Voltage imbalance should be no more than 2% of the
average voltage.
G 2. Apply 120VAC and verify its value on the terminal block in the Power Panel. Make the measurement between terminals 5 and 2 of CTB2. The
voltage should be 120VAC +/- 10%.
TABLE 25 – SETPOINTS
OPTIONS
Display Language
Sys 1 Switch
Sys 2 Switch
Unit Type
Chilled Liquid
Ambient Control
Local/ Remote Mode
Control Mode
Display Units
Lead/Lag Control
Fan Control
Manual Override
COOLING SETPOINTS
Cooling Setpoint
Range
EMS-PWM Max. Setpoint
PROGRAM
Discharge Pressure Cutout
Suct. Pressure Cutout
Low Amb. Temp. Cutout
Leaving Liquid Temp. Cutout
Anti-Recycle Time
Fan Control On-Pressure
Fan Differential Off-Pressure
Total # of Compressors
YORK INTERNATIONAL

FORM 150.62-NM1

G 3. Program/verify the Cooling Setpoints, Program
Setpoints, and unit Options. Record the values
below (see sections on Setpoints and Unit keys
for programming instruction).
G 4. Put the unit into Service Mode (as described under the Control Service And Troubleshooting section) and cycle each condenser fan to ensure
proper rotation.
G 5. Prior to this step, turn system 2 off (if applicable refer to Option 2 under “Unit Keys” section for
more information on system switches.) Connect
a manifold gauge to system 1 suction and discharge service valves.
Place the Unit Switch in the control panel to the
ON position. As each compressor cycles on,
ensure that the discharge pressure rises and
the suction pressure decreases. If this does
not occur, the compressor being tested is operating in the reverse direction and must be corrected. After verifying proper compressor rotation,
turn the Unit Switch to “OFF.”

The chilled liquid setpoint may need
to be temporarily lowered to ensure all
compressors cycle “on.”

This unit uses scroll compressors
which can only operate in one direction. Failure to observe these steps
could lead to compressor failure.

G 6. YCAL0040 - YCAL0080 units only – Turn system
1 off and system 2 on (refer to Option 2 under
“Unit Keys” section for more information on system switches.)
Place the Unit Switch in the control panel to the
ON position. As each compressor cycles “on,”
ensure that the discharge pressure rises and
the suction pressure decreases. If this does
not occur, the compressor being tested is operating in the reverse direction and must be corrected. After verifying proper compressor rotation,
turn the Unit Switch to “OFF.”

YORK INTERNATIONAL

The chilled liquid setpoint may need
to be temporarily lowered to ensure all
compressors cycle “on.”

G 7. After verifying compressor rotation, return the Unit
Switch to the off position and ensure that both
Systems are programmed for “ON” (refer to Option 2 under “Unit Keys” section for more information on system switches).
INITIAL START-UP
After the preceding checks have been completed and
the control panel has been programmed as required in
the pre-startup checklist, the chiller may be placed into
operation.
G 1. Place the Unit Switch in the control panel to the
ON position.
G 2. The first compressor will start and a flow of refrigerant will be noted in the sight glass. After several minutes of operation, the vapor in the sight
glass will clear and there should be a solid column of liquid when the TXV stabilizes.
G 3. Allow the compressor to run a short time, being
ready to stop it immediately if any unusual noise
or adverse conditions develop.
G 4. Check the system operating parameters. Do this
by selecting various displays such as pressures
and temperatures and comparing these readings
to pressures and temperatures taken with manifold gauges and temperature sensors.
G 5. With an ammeter, verify that each phase of the
condenser fans and compressors are within the
RLA as listed under Electrical Data.

CHECKING SUPERHEAT AND SUBCOOLING
The subcooling and superheat should always be
checked when charging the system with refrigerant.
When the refrigerant charge is correct, there will be no
vapor in the liquid sight glass with the system operating
under full load conditions, and there will be 15°F (8.34°C)
subcooled liquid leaving the condenser.
An overcharged system should be guarded against. The
temperature of the liquid refrigerant out of the condenser
should be no more than 15°F (8.34°C) subcooled at
design conditions.

55

1

Installation

The subcooling temperature of each system can be calculated by recording the temperature of the liquid line
at the outlet of the condenser and subtracting it from
the liquid line saturation temperature at the liquid stop
valve (liquid line saturation temp. is converted from a
temperature/pressure chart).

Example:

Example:
Liquid line pressure =
202 PSIG converted to
minus liquid line temp.
SUBCOOLING =

When adjusting the expansion valve, the adjusting screw
should be turned not more than one turn at a time, allowing sufficient time (approximately 15 minutes) between adjustments for the system and the thermal expansion valve to respond and stabilize.

102°F
- 87°F
15°F

The subcooling should be adjusted to 15°F at design
conditions.
G 1. Record the liquid line pressure and its corresponding temperature, liquid line temperature and
subcooling below:

Liq Line Press =
Saturated Temp =
Liq Line Temp =
Subcooling =

SYS 1
_______
_______
_______
_______

SYS 2
_______ PSIG
_______ °F
_______ °F
_______ °F

After the subcooling is verified, the suction superheat
should be checked. The superheat should be checked
only after steady state operation of the chiller has been
established, the leaving water temperature has been
pulled down to the required leaving water temperature,
and the unit is running in a fully loaded condition. Correct superheat setting for a system is 10°F (5.56°C) 18"
(46 cm) from the cooler.
The superheat is calculated as the difference between
the actual temperature of the returned refrigerant gas
in the suction line entering the compressor and the temperature corresponding to the suction pressure as
shown in a standard pressure/temperature chart.

56

Suction Temp =
minus Suction Press
60 PSIG converted to Temp
Superheat =

46°F
- 34°F
12°F

Assure that superheat is set at 10°F (5.56°C).
G 2. Record the suction temperature, suction pressure,
suction saturation temperature, and superheat of
each system below:

Suction temp =
Suction Pressure =
Saturation Temp =
Superheat =

SYS 1
_______
_______
_______
_______

SYS 2
_______ °F
_______ PSIG
_______ °F
_______ °F

LEAK CHECKING
G 1. Leak check compressors, fittings, and piping to
assure no leaks.
If the unit is functioning satisfactorily during the initial
operating period, no safeties trip and the compressors
cycle to control water temperature to setpoint, the chiller
is ready to be placed into operation.

YORK INTERNATIONAL

FORM 150.62-NM1

UNIT OPERATING SEQUENCE
The operating sequence described below relates to operation on a hot water start after power has been applied, such as start-up commissioning. When a compressor starts, internal timers limit the minimum time
before another compressor can start to 1 minute.

door air temperature > 25°F (-4°C)). See the section
on Operating Controls for details concerning condenser fan cycling.

1

1. For the chiller system to run, the Flow Switch must
be closed, any remote cycling contacts must be
closed, the Daily Schedule must not be scheduling
the chiller off, and temperature demand must be
present.

5. After 1 minutes of compressor run time, the next
compressor in sequence will start when a system
has to load. This compressor will be the one with the
least run time that is currently not running in that system. Additional compressors will be started at 60
second intervals as needed to satisfy temperature
setpoint.

2. When power is applied to the system, the microprocessor will start a 2 minute timer. This is the same
timer that prevents an instantaneous start after a
power failure.

6. If demand requires, the lag system will cycle on with
the same timing sequences as the lead system. Refer to the section on Capacity Control for a detailed
explanation of system and compressor staging.

3. At the end of the 2 minute timer, the microprocessor
will check for cooling demand. If all conditions allow
for start, the first compressor on the lead system will
start and the liquid line solenoid will open. The compressor with the least run time in that system will be
the first to start. Coincident with the start, the anticoincident timer will be set and begin counting downward from “60” seconds to “0” seconds.

7. As the load decreases below setpoint, the compressors will be shut down in sequence. This will occur
at intervals of either 60, 30, or 20 seconds based on
water temperature as compared to setpoint, and control mode. See the section on Capacity Control for a
detailed explanation.

If the unit is programmed for Auto Lead/Lag, the
system with the shortest average run-time of the compressors will be assigned as the “lead” system. A
new lead/lag assignment is made whenever all systems shut down.
4. Several seconds after the compressor starts, that
systems first condenser fan will be cycled on (out-

YORK INTERNATIONAL

8. When the last compressor in a “system” (two or three
compressors per system), is to be cycled off, the
system will initiate a pump-down. Each “system” has
a pump-down feature upon shut-off. On a non-safety,
non-unit switch shutdown, the LLSV will be turned
off, and the last compressor will be allowed to run
until the suction pressure falls below the suction pressure cutout or for 180 seconds, which ever comes
first.

57

Unit Controls

UNIT CONTROLS
YORK MILLENNIUM CONTROL CENTER

00065VIP

INTRODUCTION

MICROPROCESSOR BOARD

The YORK MicroComputer Control Center is a microprocessor based control system designed to provide the
entire control for the liquid chiller. The control logic embedded in the microprocessor based control system will
provide control for the chilled liquid temperatures, as
well as sequencing, system safeties, displaying status,
and daily schedules. The MicroComputer Control Center consists of four basic components, 1) microprocessor board, 2) transformer, 3) display and 4) keypad. The
keypad allows programming and accessing setpoints,
pressures, temperatures, cutouts, daily schedule, options, and fault information.

The Microprocessor Board is the controller and decision maker in the control panel. System inputs such as
pressure transducers and temperature sensors are connected directly to the Microprocessor Board. The Microprocessor Board circuitry multiplexes the analog inputs, digitizes them, and scans them to keep a constant watch on the chiller operating conditions. From
this information, the Microprocessor then issues commands to the Relay Outputs to control contactors, solenoids, etc. for Chilled Liquid Temperature Control and
to react to safety conditions.

Remote cycling, demand limiting and chilled liquid temperature reset can be accomplished by field supplied
contacts.

Compressor starting/stopping and loading/unloading decisions are performed by the Microprocessor to maintain leaving or return chilled liquid temperature. These
decisions are a function of temperature deviation from
setpoint.

A Master ON/Off switch is available to activate or deactivate the unit.

58

Keypad commands are acted upon by the micro to
change setpoints, cutouts, scheduling, operating requirements, and to provide displays.
The on-board power supply converts 24VAC from the
1T transformer to a +12VDC and +5VDC regulated
supply located on the Microprocessor Board. This voltage is used to operate integrated circuitry on the board.
The 40 character display and unit sensors are supplied
power from the micro board 5VDC supply.
24VAC is rectified and filtered to provide unregulated
+30 VDC to supply the flow switch, PWM remote temperature reset, and demand limit circuitry which is available to be used with field supplied contacts.

YORK INTERNATIONAL

FORM 150.62-NM1

The Microprocessor Board energizes on-board relays
to output 120VAC to motor contactors, solenoid valves,
etc. to control system operation.
UNIT SWITCH
A UNIT ON/OFF switch is just underneath the keypad.
This switch allows the operator to turn the entire unit
OFF if desired. The switch must be placed in the ON
position for the chiller to operate.
DISPLAY
The 40 Character Display (2 lines of 20 characters) is a
liquid crystal display used for displaying system parameters and operator messages.
The display in conjunction with the keypad, allows the
operator to display system operating parameters as well
as access programmed information already in memory.
The display has a lighted background for night viewing
and for viewing in direct sunlight.
When a key is pressed, such as the OPER DATA key,
system parameters will be displayed and will remain on
the display until another key is pressed. The system
parameters can be scrolled with the use of the up and
down arrow keys. The display will update all information at a rate of about 2 seconds.
Display Messages may show characters indicating
“greater than” (>) or “less than” (<). These characters
indicate the actual values are greater than or less than
the limit values which are being displayed.

YORK INTERNATIONAL

KEYPAD
The 12 button non-tactile keypad allows the user to retrieve vitals system parameters such as system pressures, temperatures, compressor running times and
starts, option information on the chiller, and system
setpoints. This data is useful for monitoring chiller operation, diagnosing potential problems, troubleshooting,
and commissioning the chiller.
It is essential the user become familiar with the use of
the keypad and display. This will allow the user to make
full use of the capabilities and diagnostic features available.
BATTERY BACK-UP
The Microprocessor Board contains a Real Time Clock
integrated circuit chip with an internal battery back-up.
The purpose of this battery back-up is to assure any
programmed values (setpoints, clock, cutouts, etc.) are
not lost during a power failure regardless of the time
involved in a power cut or shutdown period.
UNIT STATUS
Pressing the STATUS key will enable the operator to
determine current chiller operating status. The messages displayed will include running status, cooling demand, fault status, external cycling device status, load
limiting and anti-recycle/coincident timer status. The
display will be a single message relating to the highest
priority message as determined by the micro. Status
messages fall into the categories of General Status and
Fault Status.

59

2

Unit Controls

“STATUS” KEY

00066VIP

The following messages are displayed when the “Status” key is pressed. Following each displayed message
is an explanation pertaining to that particular display.
GENERAL STATUS MESSAGES
In the case of messages which apply to individual systems, SYS 1 and, SYS 2 messages will both be displayed and may be different. In the case of single system units, all SYS 2 messages will be blank.
U N I T
SW I T C H
S H U T D OWN

O F F

This message informs the operator that the UNIT switch
on the control panel is in the OFF position which will not
allow the unit to run.

R E M O T E
C O N T R O L L E D
S H U T D OWN

The REMOTE CONTROLLED SHUTDOWN message
indicates that either an ISN or BAS system has turned
the unit off, not allowing it to run.
D A I L Y
S C H E D U L E
S H U T D OWN

The DAILY SCHEDULE SHUTDOWN message indicates that the daily/holiday schedule programmed is
keeping the unit from running.
F L OW
SW I T C H / R E M
S T O P
N O
R U N
P E R M I S S I V E

NO RUN PERM shows that either the flow switch is
open or a remote start/stop contact is open in series
with the flow switch.

60

YORK INTERNATIONAL

FORM 150.62-NM1

S Y S
S Y S

1
2

S Y S
S Y S

SW I T C H
SW I T C H

O F F
O F F

Sys Switch Off tells that the system switch under OPTIONS is turned off. The system will not be allowed to
run until the switch is turned back on.
S Y S
S Y S

1
2

N O
N O

C O O L
C O O L

L O A D
L O A D

These messages inform the operator that the chilled
liquid temperature is below the point (determined by the
setpoint and control range) that the micro will bring on a
system or that the micro has not loaded the lead system far enough into the loading sequence to be ready
to bring the lag system ON. The lag system will display
this message until the loading sequence is ready for
the lag system to start.
S Y S
S Y S

1
2

C OM P S
C OM P S

R U N
R U N

X
X

The COMPS RUNNING message indicates that the respective system is running due to demand. The “X” will
be replaced with the number of compressors in that system that are running.
S Y S
S Y S

1
2

A R
A R

T I M E R
T I M E R

X X
X X

S
S

The anti-recycle timer message shows the amount of
time left on the respective systems anti-recycle timer.
This message is displayed when the system is unable
to start due the anti-recycle timer being active.

YORK INTERNATIONAL

S Y S
S Y S

1
2

A C
A C

T I M E R
T I M E R

X X
X X

S
S

The anti-coincident timer is a software feature that
guards against 2 systems starting simultaneously. This
assures instantaneous starting current does not become
excessively high due to simultaneous starts. The micro
limits the time between compressor starts to 1 minute
regardless of demand or the anti-recycle timer being
timed out. The anti-coincident timer is only present on
two system units.
S Y S
S Y S

1
2

D S C H
D S C H

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

When this message appears, discharge pressure limiting is in effect. The Discharge Pressure Limiting feature is integral to the standard software control; however the discharge transducer is optional. Therefore, it
is important to keep in mind that this control will not
function unless the optional discharge transducer is installed in the system.
The limiting pressure is a factory set limit to keep the
system from faulting on the high discharge pressure
cutout due to high load or pull down conditions. When
the unload point is reached, the micro will automatically
unload the affected system by deenergizing one compressor. The discharge pressure unload will occur when
the discharge pressure gets within 15 PSIG of the programmed discharge pressure cutout. This will only happen if the system is fully loaded and will shut only one
compressor off. If the system is not fully loaded, discharge limiting will not go into effect. Reloading the affected system will occur when the discharge pressure
drops to 85% of the unload pressure and 10 minutes
have elapsed.

61

2

Unit Controls

S Y S
S Y S

1
2

S U C T
S U C T

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

When this message appears, suction pressure limiting
is in effect. Suction Pressure Limiting is only available
on units that have the suction pressure transducer installed. If a low pressure switch is installed instead, suction pressure limiting will not function.
The suction pressure limit is a control point that limits
the loading of a system when the suction pressure drops
to within 15% above the suction pressure cutout. On a
standard system programmed for 44 PSIG/3.0 Bar suction pressure cutout, the micro would inhibit loading of
the affected system with the suction pressure less than
or equal to 1.15 * 44 PSIG/3.0 Bar = 50 PSIG/3.5 Bar.
The system will be allowed to load after 60 seconds
and after the suction pressure rises above the suction
pressure limit point.

expect to see any other STATUS messages when in
the MANUAL OVERRIDE mode. MANUAL OVERRIDE
is to only be used in emergencies or for servicing.
Manual override mode automatically disables itself after 30 minutes.
S Y S
S Y S

1
2

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

D OWN
D OWN

The PUMPING DOWN message indicates that a compressor in the respective system is presently in the process of pumping the system down. When pumpdown is
initiated, the liquid line solenoid will close and a compressor will continue to run. When the suction pressure
decreases to the suction pressure cutout setpoint, the
compressor will cycle off. If pump down cannot be
achieved three minutes after the liquid line solenoid
closes, the compressor will cycle off.
FAULT STATUS MESSAGES

S Y S
S Y S

1
2

L O A D
L O A D

L I M I T
L I M I T

X X %
X X %

This message indicates that load limiting is in effect and
the percentage of the limiting in effect. This limiting could
be due to the load limit/pwm input or an ISN controller
could be sending a load limit command.
M A N U A L
O V E R R I D E

If MANUAL OVERRIDE mode is selected, the STATUS
display will display this message. This will indicate that
the Daily Schedule is being ignored and the chiller will
start-up when chilled liquid temperature allows, Remote
Contacts, UNIT switch and SYSTEM switches permitting. This is a priority message and cannot be overridden by anti-recycle messages, fault messages, etc.
when in the STATUS display mode. Therefore, do not

62

Safeties are divided into two categories - system safeties and unit safeties. System safeties are faults that
cause the individual system to be shut down. Unit safeties are faults that cause all running compressors to be
shut down. Following are display messages and explanations.
SYSTEM SAFETIES
System safeties are faults that cause individual systems
to be shut down if a safety threshold is exceeded for 3
seconds. They are auto reset faults in that the system
will be allowed to restart automatically after the fault
condition is no longer present. However, if 3 faults on
the same system occur within 90 minutes, that system
will be locked out on the last fault. This condition is then
a manual reset. The system switch (under OPTIONS
key) must be turned off and then back on to clear the
lockout fault.

YORK INTERNATIONAL

FORM 150.62-NM1

S Y S
S Y S

1
2

H I G H
H I G H

D S C H
D S C H

P R E S
P R E S

The Discharge Pressure Cutout is a software cutout in
the microprocessor and is backed-up by a mechanical
high pressure cutout switch located in the refrigerant
circuit. It assures that the system pressure does not
exceed safe working limits. The system will shutdown
when the programmable cutout is exceeded and will
be allowed to restart when the discharge pressure falls
below the cutout. Discharge transducers must be installed for this function to operate.
S Y S
S Y S

1
2

L OW
L OW

S U C T
S U C T

P R E S S
P R E S S

The Suction Pressure Cutout is a software cutout that
protects the chiller from an evaporator freeze-up should
the system attempt to run with a low refrigerant charge
or a restriction in the refrigerant circuit.
At system start, the cutout is set to 10% of programmed
value. During the next 3 minutes the cutout point is
ramped up to the programmed cutout point. If at any
time during this 3 minutes the suction pressure falls
below the ramped cutout point, the system will stop.
This cutout is ignored for the first 90 seconds of system run time to avoid nuisance shutdowns, especially
on units that utilize a low pressure switch in place of
the suction pressure transducer.
After the first 3 minutes, if the suction pressure falls
below the programmed cutout setting, a “transient protection routine” is activated. This sets the cutout at 10%

YORK INTERNATIONAL

of the programmed value and ramps up the cutout over
the next 30 seconds. If at any time during this 30 seconds the suction pressure falls below the ramped cutout, the system will stop. This transient protection
scheme only works if the suction pressure transducer
is installed. When using the mechanical LP switch, the
operating points of the LP switch are: opens at 23 PSIG
+/- 5 PSIG (1.59 barg +/- .34 barg), and closes at 35
PSIG +/- 5 PSIG (2.62 barg +/- .34 barg).
S Y S
S Y S

1
2

M P / H P C O
M P / H P C O

F A U L T
F A U L T

The Motor Protector/Mechanical High Pressure Cutout
protect the compressor motor from overheating or the
system from experiencing dangerously high discharge
pressure. This fault condition is present when CR1 (SYS 1)
or CR2 (SYS 2) relays de-energize due to the HP switch
or the motor protector opening. This causes the respective CR contacts to open causing 0 VDC to be read on
the inputs to the microboard. The fault condition is
cleared when a 30 VDC signal is restored to the input.
The internal motor protector opens at 185°F - 248°F
(85°C - 120°C) and auto resets. The mechanical HP
switch opens at 405 PSIG +/- 10 PSIG (27.92 barg +/.69 barg) and closes at 330 PSIG +/- 25 PSIG (22.75
barg +/- 1.72 barg).
UNIT SAFETIES
Unit safeties are faults that cause all running compressors to be shut down. Unit faults are auto reset faults in
that the unit will be allowed to restart automatically after
the fault condition is no longer present.

63

2

Unit Controls

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

The Low Ambient Temp Cutout is a safety shutdown
designed to protect the chiller from operating in a low
ambient condition. If the outdoor ambient temperature
falls below the programmable cutout, the chiller will shut
down. Restart can occur when temperature rises 2°F
above the cutoff.
U N I T
F A U L T :
L OW
L I Q U I D
T E M P

Restart is allowed after the unit is fully powered again
and the anti-recycle timers have finished counting down.
UNIT WARNING
The following message is not a unit safety and will not
be logged to the history buffer. It is a unit warning and
will not auto-restart. Operator intervention is required
to allow a re-start of the chiller.
! !
L OW
B A T T E R Y
! !
C H E C K
P R O G / S E T P / O P T N

U N I T
F A U L T :
1 1 5 V A C
U N D E R
V O L T A G E

The Low Battery Warning can only occur at unit powerup. On micro panel power-up, the RTC battery is
checked. If a low battery is found, all programmed
setpoints, program values, options, time, schedule, and
history buffers will be lost. These values will all be reset
to their default values which may not be the desired
operating values. Once a faulty battery is detected, the
unit will be prevented from running until the PROGRAM
key is pressed. Once PROGRAM is pressed the antirecycle timers will be set to the programmed anti-recycle time to allow the operator time to check setpoints,
program values, and options.

The Under Voltage Safety assures that the system is
not operated at voltages where malfunction of the microprocessor could result in system damage. When
the115VAC to the micro panel drops below a certain
level, a unit fault is initiated to safely shut down the unit.

If a low battery is detected, it should be replaced as
soon as possible. The programmed values will all be
lost and the unit will be prevented from running on the
next power interruption. The RTC/battery is located at
U17 on the microboard.

The Low Leaving Chilled Liquid Temp Cutout protects
the chiller form an evaporator freeze-up should the
chilled liquid temperature drop below the freeze point.
This situation could occur under low flow conditions or
if the micro panel setpoint values are improperly programmed. Anytime the leaving chilled liquid temperature (water or glycol) drops below the cutout point, the
chiller will shutdown. Restart can occur when chilled
liquid temperature rises 2°F above the cutout.

64

YORK INTERNATIONAL

FORM 150.62-NM1

STATUS KEY MESSAGES
TABLE 26 – STATUS KEY MESSAGES

STATUS KEY MESSAGES

General Messages

Fault Messages

Unit Switch Off
Shutdown

System Safeties

Unit Safeties

Remote Controlled
Shutdown

System X High Disch Pressure

Low Ambient Temp

Daily Schedule
Shutdown

System X Low Suct Pressure

Low Liquid Temp

Flow Switch/Rem Stop
No Run Permissive

System X MP/HPCO Fault

115 VAC Undervoltage

System X Switch Off

2

Low Battery
Check Prog/Step/Optn
(Unit Warning Message)

System X
No Cooling load

System X Comps Run

System X AR Timer

System X AC Timer

System X Disch Limiting

System X Suction Limiting

System X Percentage Load Limiting

Manual Overide Status
LD04144

System X Pumping Down (on shutdown)

YORK INTERNATIONAL

65

Unit Controls

DISPLAY/PRINT KEYS

00067VIP

The Display/Print keys allow the user to retrieve system and unit information that is useful for monitoring
chiller operation, diagnosing potential problems, troubleshooting, and commissioning the chiller.
System and unit information, unit options, setpoints, and
scheduling can also be printed out with the use of a
printer. Both real-time and history information are available.
OPER DATA Key
The OPER DATA key gives the user access to unit and
system operating parameters. When the OPER DATA
key is pressed, system parameters will be displayed
and remain on the display until another key is pressed.
After pressing the OPER DATA key, the various operating data screens can be scrolled through by using the
UP and DOWN arrow keys located under the “ENTRY”
section.

66

With the “UNIT TYPE” programmed as a liquid chiller
(under the Options key), the following is a list of operating data screens in the order that they are displayed:
L C H L T
R C H L T

=
=

4 6 . 2 ° F
5 7 . 4 ° F °

This display shows chilled leaving and return liquid temperatures. The minimum limit on the display for these
parameters are 9.2°F (-12.7°C). The maximum limit
on the display is 85.4°F (29.7°C).
A M B I E N T
A I R
=
8 7 . 5 ° F

T E M P

This display shows the ambient air temperature. The
minimum limit on the display is 0.4°F (-17.6°C).The
maximum limit on the display is 131.2°F (55.1°C).

YORK INTERNATIONAL

FORM 150.62-NM1

S Y S

1

S P
D P

=
7 2 . 1
= 2 2 7 . 0

P S I G
P S I G

S Y S

2

S P
D P

=
7 3 . 6
= 2 1 9 . 8

P S I G
P S I G

These displays show suction and discharge pressures
for systems 1 & 2. The discharge pressure transducer
is optional on all models
If the optional discharge transducer is not installed, the
discharge pressure would display 0 PSIG (0 barg).
Some models come factory wired with a low pressure
switch in place of the suction transducer. In this case,
the suction pressure would only be displayed as the
maximum suction pressure reading of >200 PSIG (13.79
barg) when closed, or < 0 PSIG (0 barg) when open.
The minimum limits for the display are:
Suction Pressure: 0 PSIG (0 barg)
Discharge Pressure: 0 PSIG (0 barg)
The maximum limits for the display are:
Suction Pressure: 200 PSIG (13.79 barg)
Discharge Pressure: 400 PSIG (27.58 barg)
S Y S

S Y S

X
H O U R S
1 = X X X X X
2 = X X X X X,
3 = X X X X X

X
S T A R T S
1 = X X X X X
2 = X X X X X,
3 = X X X X X

The above two messages will appear sequentially for
each system. The first display shows accumulated running hours of each compressor for the specific system.
The second message shows the number of starts for
each compressor on each system.

YORK INTERNATIONAL

L O A D
T I M E R
=
5 8
U N L O A D
T I M E R
=
0

S E C
S E C

This display of the load and unload timers indicate the
time in seconds until the unit can load or unload.
Whether the systems loads or unloads is determined
by how far the actual liquid temperature is from setpoint.
A detailed description of unit loading and unloading is
covered under the topic of Capacity Control.

C O O L I N G
2
O F
8

D E M A N D
S T E P S

The display of COOLING DEMAND indicates the current “step” in the capacity control scheme. The number
of available steps are determined by how many compressors are in the unit. In the above display, the “2”
does not mean that two compressor are running but
only indicates that the capacity control scheme is on
step 2 of 8. Capacity Control is covered in more detail
in this publication which provides specific information
on compressor staging.

L E A D
S Y S T E M
I S
S Y S T E M
N U M B E R
2

This display indicates the current LEAD system. In this
example system 2 is the LEAD system, making system
1 the LAG compressor. The LEAD system can be manually selected or automatic. Refer to the programming
under the “Options” key.

A unit utilizing hot gas bypass should
be programmed for MANUAL with
system 1 as the lead system. Failure to
do so will prevent hot gas operation if
system 2 switches to the lead system
when programmed for AUTOMATIC
LEAD/LAG.

67

2

Unit Controls

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

O N
O F F

This display indicates the status of the evaporator pump
contacts and the evaporator heater.
The evaporator pump dry contacts are energized when
any compressor is running, or the unit is not OFF on
the daily schedule and the unit switch is on, or the unit
has shutdown on a Low Leaving Chilled Liquid fault.
However, even if one of above is true, the pump will not
run if the micro panel has been powered up for less
than 30 seconds or if the pump has run in the last 30
seconds to prevent pump motor overheating.
The evaporator heater is controlled by ambient air temperature. When the ambient temperature drops below
40°F the heater is turned on. When the temperature rises
above 45°F the heater is turned off. An under voltage
condition will keep the heater off until full voltage is restored to the system.

A C T I V E

R E M O T E
N O N E

C T R L

There are several types of remote systems that can be
used to control or monitor the unit. The following messages indicate the type of remote control mode active:
NONE – no remote control active. Remote monitoring
may be via ISN
ISN – YorkTalk via ISN (Remote Mode)
*LOAD LIM – load limiting enabled. Can be either stage
1 or stage 2 of limiting.
*PWM TEMP – EMS-PWM temperature reset

S Y S
X
N U M B E R
C OM P S
R U N N I N G

O F
X

S Y S
X
R U N T I M E
X X - X X - X X - X X
D - H - M - S

S Y S
H O T

S Y S

X
L L S V
I S
O N
G A S
S O L
I S
O F F

X

F A N

S T A G E

3

The above four message will appear sequentially, first
for system 1, then for system 2.
The first message indicates the system and number of
compressors that are being commanded on by the micro board.
The second message indicates the system run time in
days – hours – minutes – seconds. Please note that this
is not accumulated run time but pertains only to the current system cycle.
The third message indicates the system, and whether
the liquid line solenoid and hot gas solenoid are being
commanded on by the micro board. Please note that
hot gas in not available for system 2, so there is no message pertaining to the hot gas solenoid when system 2
message is displayed.
The fourth message indicates what stage of condenser
fan operation is active. Unless a low ambient kit is added,
only stages 1 and 2 will be used to cycle the condenser
fans. However, stage 3 may be shown in this display
without a low ambient kit added, but it has no effect.
See the section on Condenser Fan Control in the Unit
Operation section.

*Refer to the section on Operating Controls

68

YORK INTERNATIONAL

FORM 150.62-NM1

OPER DATA Quick Reference List
The following table is a quick reference list for information available under the OPER DATA key.

TABLE 27 – OPERATION DATA
Oper Data Key

Leaving & Chilled Liquid Temps

Ambient Air Temperature

2
System 1 Discharge & Suction Pressure

System 2 Discharge & Suction Pressure

*System X Accumulated Run Times

*System X Accumulated Starts

Load and Unload Timers

Cooling Demand Steps

Lead System Indicator

Evaporator Pump Contacts & Heater Status

Remote Control Active?

*System X Number of Comp. Running

*System X Run Time

Sys 1 LLSV & HGSV Status
LD03684

*System X Condenser Fan Staging
* Block of information repeats for each system
YORK INTERNATIONAL

69

Unit Controls

PRINT Key

OPERATING DATA PRINTOUT

The PRINT key allows the operator to obtain a printout
of real-time system operating data or a printout of system data at the “instant of the fault” on the last six faults
which occurred on the unit. An optional printer is required for the printout.

Pressing the PRINT key and then OPER DATA key allows the operator to obtain a printout of current
systemoperating parameters. When the OPER DATA
key is pressed, a snapshot will be taken of system operating conditions and panel programming selections.
This data will be temporarily stored in memory and transmission of this data will begin to the printer. A sample
Oper Data printout is shown below.

SYSTEM 1 DATA
YORK INTERNATIONAL CORPORATION
MILLENNIUM LIQUID CHILLER
UNIT STATUS
2:04PM 01 JAN 99
SYS 1
NO COOLING LOAD
SYS 2
COMPRESSORS RUNNING 2
OPTIONS
CHILLED LIQUID
WATER
AMBIENT CONTROL
STANDARD
LOCAL/REMOTE MODE
REMOTE
CONTROL MODE
LEAVING LIQUID
LEAD/LAG CONTROL
AUTOMATIC
FAN CONTROL
AMB & DSCH PRESS
PROGRAM VALUES
DSCH PRESS CUTOUT
395 PSIG
SUCT PRESS CUTOUT
44 PSIG
LOW AMBIENT CUTOUT
25.0 DEGF
LEAVING LIQUID CUTOUT
25.0 DEGF
ANTI RECYCLE TIME
600 SECS
FAN CONTROL ON PRESS
230 PSIG
FAN DIFF OFF PRESS
80 PSIG
NUMBER OF COMPRESSORS
6
UNIT DATA
RETURN LIQUID TEMP
58.2 DEGF
LEAVING LIQUID TEMP
53.0 DEGF
DISCHARGE AIR TEMP
55.3 DEGF
COOLING RANGE
42.0 +/- 2.0 DEGF
SYS 1 SETPOINT
70 +/- 3 PSIG
SYS 2 SETPOINT
70 +/-3 PSIG
AMBIENT AIR TEMP
74.8 DEGF
LEAD SYSTEM
SYS 2
EVAPORATOR PUMP
ON
EVAPORATOR HEATER
OFF
ACTIVE REMOTE CONTROL
NONE
SOFTWARE VERSION
C.M02.01.00

70

COMPRESSORS STATUS
OFF
RUN TIME
0- 0- 0- 0 D-H-M-S
SUCTION PRESSURE
66 PSIG
DISCHARGE PRESSURE
219 PSIG
SUCTION TEMPERATURE
52.8 DEGF
LIQUID LINE SOLENOID
OFF
HOT GAS BYPASS VALVE
OFF
CONDENSER FAN STAGES
OFF
SYSTEM 2 DATA
COMPRESSORS STATUS
2
RUN TIME
0- 0- 1-46 D-H-M-S
SUCTION PRESSURE
51 PSIG
DISCHARGE PRESSURE
157 PSIG
LIQUID LINE SOLENOID
ON
CONDENSER FAN STAGES
3
DAILY SCHEDULE
S M
MON
TUE
WED
THU
FRI
SAT
HOL

T W T F S
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM
START=00:00AM

*=HOLIDAY
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM
STOP=00:00AM

See Service And Troubleshooting section for Printer Installation information.

YORK INTERNATIONAL

FORM 150.62-NM1

HISTORY PRINTOUT
Pressing the PRINT key and then the HISTORY key
allows the operator to obtain a printout of information
relating to the last 6 Safety Shutdowns which occurred.
The information is stored at the instant of the fault, regardless of whether the fault caused a lockout to occur.
The information is also not affected by power failures
(long term internal memory battery back-up is built into
the circuit board) or manual resetting of a fault lock-out.
When the HISTORY key is pressed, a printout is transmitted of all system operating conditions which were
stored at the “instant the fault occurred” for each of the
6 Safety Shutdowns buffers. The printout will begin with
the most recent fault which occurred. The most recent
fault will always be stored as Safety Shutdown No. 1.
Identically formatted fault information will then be printed
for the remaining safety shutdowns.
Information contained in the Safety Shutdown buffers
is very important when attempting to troubleshoot a system problem. This data reflects the system conditions
at the instant the fault occurred and often reveals other
system conditions which actually caused the safety
threshold to be exceeded.
The history printout is similar to the operational data
printout shown in the previous section. The differences
are in the header and the schedule information. The
daily schedule is not printed in a history print.
One example history buffer printout is shown below. The
data part of the printout will be exactly the same as the
operational data print so it is not repeated here. The
difference is that the Daily Schedule is not printed in
the history print and the header will be as shown below.

YORK INTERNATIONAL

YORK INTERNATIONAL CORPORATION
MILLENNIUM LIQUID CHILLER
SAFETY SHUTDOWN NUMBER 1
SHUTDOWN @ 3:56PM 29 JAN 99
SYS 1
SYS 2

HIGH DSCH PRESS SHUTDOWN
NO FAULTS

HISTORY DISPLAYS
The HISTORY key gives the user access to many unit
and system operating parameters at the time of a unit
or system safety shutdown. When the HISTORY key
is pressed the following message is displayed.
D I S P L A Y
S A F E T Y
S H U TD OWN
N O .
1
( 1 TO 6 )

While this message is displayed, the UP or DOWN arrow keys can be used to select any of the six history
buffers. Buffer number 1 is the most recent, and buffer
number 6 is the oldest safety shutdown that was saved.
After selecting the shutdown number, pressing the ENTER key displays the following message which shows
when the shutdown occurred.
S H U T
D OWN
O C C U R R E D
1 1 : 2 3
P M
2 9
M A Y
9 8

71

2

Unit Controls

The UP and DOWN arrows are used to scroll forwards
and backwards through the history buffer to display the
shutdown conditions. Following is a list of displayed history data screens in the order that they are displayed:
U N I T
F A U L T :
L OW
L I Q U I D
T E M P

U N I T
L I Q U I D

T Y P E
C H I L L E R

C H I L L E D
L I Q U I D
X X X X X

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

F A N
C O N T R O L
O N
P R E S S U R E = X X X
P S I G

F A N
D I F F E R E N T I A L
P R E S S U R E = PS I G

L C H L T
R C H L T

L E A D / L A G
C O N T R O L
X X X X X X X X

F A N
CO N T R O L
D I S C H A R G E
PR E S S U R E

M A N U A L

O V E R R I D E
X X X X X X X X X

S U C T I O N
P R E S S U R E
C U T O U T
=
X X X X
P S I G

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

72

° F
° F

A M B I E N T
A I R
=
X X X . X

° F

T E M P
° F

L E A D
S Y S T E M
I S
S Y S T E M
N U M B E R
X

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

A C T I V E

R E MO T E
X X X X

C T R L

S Y S
X
C OM P S

N U M B E R
O F
R U N N I N G
X

M O D E

D I S C H A R G E
P R E S S U R E
C U T O U T
=
X X X X
P S I G

L E A V I N G
C U T O U T

X X X . X
X X X . X

S E T P O I N T
=
X X . X
R A N G E
=
+ / - ° F

L O C A L / RE M O T E
MO D E
X X X X X X X X X

C O N T R O L
MO D E
L E A V I N G
L I Q U I D

=
=

OFF

L I Q U I D
T E M P
=
X X X . X
° F

S Y S
X
R U N
X X - X X - X X - X X

S Y S

X

S Y S
H O T

S Y S

S P
D P

=
=

X X X X
X X X X

X
L L S V
G A S
S O L

X

F A N

T I M E
D - H - M - S

P S I G
P S I G

I S
I S

X X X
X X X

S T A G E

X X X

Explanation of the above displays are covered under
the STATUS, DISPLAY/PRINT, SETPOINTS, or UNIT
keys.

YORK INTERNATIONAL

FORM 150.62-NM1

“ENTRY” KEYS

2

00068VIP

The Entry Keys allows the user to view, change programmed values. The ENTRY keys consist of an UP
ARROW key, DOWN ARROW key, and an ENTER/ADV
key.
UP AND DOWN ARROW KEYS
Used in conjunction with the OPER DATA and HISTORY
keys, the UP and DOWN arrow keys allow the user to
scroll through the various data screens. Refer to the
section on “Display/Print” keys for specific information
on the displayed information and specific use of the
UP and DOWN arrow keys.
The UP and DOWN arrow keys are also used for programming the control panel such as changing cooling

YORK INTERNATIONAL

setpoints, setting the daily schedule, changing safety
setpoints, chiller options, and setting the clock.
ENTER/ADV key
The ENTER key must be pushed after any change is
made to the cooling setpoints, daily schedule, safety
setpoints, chiller options, and the clock. Pressing this
key “enters” the new values into memory. If the ENTER key is not pressed after a value is changed, the
changes will not be “entered” and the original values
will be used to control the chiller.
Programming and a description on the use of the UP
and DOWN arrow and ENTER/ADV keys are covered
in detail under the SETPOINTS, and UNIT keys.

73

Unit Controls

“SETPOINTS” KEYS

00069IP

Unit must first be programmed for
“Unit Type” Liquid Chiller under Option S key to allow programming of appropriate setpoints.
Programming of the cooling setpoints, daily schedule, and safeties is accomplished by using the keys
located under the SETPOINTS section.
The three keys involved are labeled COOLING
SETPOINTS, SCHEDULE/ADVANCE DAY, and PROGRAM.
Following are instructions for programming the respective setpoints. The same instruction should be used to
view the setpoints with the exception that the setpoint
will not be changed.
COOLING SETPOINTS
The Cooling setpoint and Range can be programmed
by pressing the COOLING SETPOINTS key. After
pressing the COOLING SETPOINTS key, the Cooling
Mode (leaving chilled liquid or return chilled liquid) will

74

be displayed for a few seconds, and then the setpoint
entry screen will be displayed.
Following are the four possible messages that can be
displayed after pressing the COOLING SETPOINT key,
indicating the cooling mode:
L O C A L
L E A V I N G
WA T E R
T E M P
C O N T R O L

This message indicates that the cooling setpoint is under LOCAL control. That is, the cooling setpoint is controlling to the locally programmed setpoint. The message also indicates that the control point is based on
LEAVING water temperature out of the evaporator.
L O C A L
R E T U R N
WA T E R
T E M P
C O N T R O L

This message indicates that the cooling setpoint is under LOCAL control (the cooling setpoint is controlling to
the locally programmed cooling setpoint). However, unlike the previous message, it is now indicating that the
control point is based on RETURN water temperature
into the evaporator.

YORK INTERNATIONAL

FORM 150.62-NM1

R E M 0 T E
L E A V I N G
WA T E R
T E M P
C O N T R O L

This message indicates that the cooling setpoint is under REMOTE control. When under remote control, the
cooling setpoint will be determined by a remote device
such as an ISN control. The message also indicates
that the control point is based on LEAVING water temperature out of the evaporator.
R E M O T E
R E T U R N
WA T E R
T E M P
C O N T R O L

This message indicates that the cooling setpoint is under REMOTE control. When under remote control, the
cooling setpoint will be determined by a remote device
such as an ISN control. This message also indicates
that the control point is based on RETURN water temperature into the evaporator.
Immediately after the control mode message is displayed, the COOLING SETPOINT entry screen will be
displayed. If the unit is programmed for LEAVING liquid
control the following message will be displayed:

S E T P O I N T
R A N G E
=

=
+/-

4 5 . 0 ° F
2 . 0 ° F

(leaving chilled water control)
The above message shows the current chilled water temperature SETPOINT at 45.0°F (notice the cursor positioned under the number 5). Pressing either the UP or
DOWN arrow will change the setpoint in .5°F increments.

YORK INTERNATIONAL

After using the UP and DOWN arrows to adjust to the
desired setpoint, the ENTER/ADV key must be pressed
to enter this number into memory and advance to the
RANGE SETPOINT.
This will be indicated by the cursor moving under the
current RANGE setpoint. The UP and DOWN arrow keys
are used to set the RANGE, in .5 °F increments, to the
desired RANGE setpoint. After adjusting the setpoint,
the ENTER/ADV key must be pressed to enter the data
into memory.
Notice that the RANGE was programmed for +/- X.X° F.
This indicates the SETPOINT to be in the center of the
control range. If the control mode has been programmed
for RETURN LIQUID control, the message below would
be displayed in place of the previous message.

2
S E T P O I N T
R A N G E

=
=

4 5 . 0
° F
+ 2 . 0 ° F

(return chilled liquid control)
Notice that the range no longer has a +/- X.X °F, but only
a + X.X °F RANGE setpoint. This indicates that the
setpoint is not centered within the RANGE but could be
described as the bottom of the control range A listing of
the limits and the programmable values for the COOLING SETPOINTS are shown in Table 27.
The SETPOINT and RANGE displays just described
were based on LOCAL control. If the unit was programmed for REMOTE control (under the OPTIONS
key), the above programmed setpoints would have no
effect.
Both LEAVING and RETURN control are described in
detail under the section on Capacity Control.

75

Unit Controls

Pressing the COOLING SETPOINTS key a second time
will display the remote setpoint and cooling range. This
display automatically updates about every 2 seconds.
Notice that these setpoints are not “locally” programmable, but are controlled by a remote device such as
an ISN control. These setpoints would only be valid if
the unit was operating in the REMOTE mode.

Pressing the COOLING SETPOINTS a third time will
bring up the display that allows the Maximum EMSPWM Temperature Reset to be programmed. This
message is shown below.

The messages below illustrate both leaving chilled liquid control and return chilled liquid control respectively

The Temp Reset value is the maximum allowable reset
of the temperature setpoint. The setpoint can be reset
upwards by the use of a contact closure on the PWM
Temp Reset input (CTB1 terminals 13 - 20)). See the
section on Operating Controls for a detailed explanation of this feature.

R E M
S E T P
R A N G E
=

=
4 4 . 0 ° F
+ / - 2 . 0 ° F

As with the other setpoints, the Up Arrow and Down
Arrow keys are used to change the Temp Reset value.
After using the UP and DOWN ARROWS to adjust to
the desired setpoint, the ENTER/ADV key must be
pressed to enter this number into memory.

(leaving chilled liquid control)

R E M

S E T P
R A N G E

=
=

M A X E M S - P WM
R E M O T E
T E M P
R E S E T
=
+ 2 0 ° F

4 4 . 0 ° F
1 0 . 0 ° F

(return chilled liquid control)
The low limit, high limit, and default values for the keys
under “SETPOINTS” are listed in Table 28.

TABLE 28 – COOLING SETPOINTS PROGRAMMABLE LIMITS AND DEFAULTS
SETPOINT KEY

MODEL
WATER COOLING

LEAVING CHILLED LIQUID SETPOINT
GLYCOL COOLING
LEAVING CHILLED LIQUID
CONTROL RANGE

—
WATER COOLING

RETURNED CHILLED LIQUID SETPOINT
GLYCOL COOLING
RETURN CHILLED LIQUID
CONTROL RANGE
MAX EMS-PWM REMOTE
TEMPERATURE RESET

—
—

LOW LIMIT
40.0°F
4.4°C
*10.0°F
-12.2°C
1.5°F
0.8°C
40.0°F
4.4°C
10.0°F
-12.2°C
4.0°F
2.2°C
2°F
1.0°C

HIGH LIMIT
**70.0°F
21.1°C
**70.0°F
21.1°C
2.5°F

DEFAULT
44.0°F
6.7°C
44.0°F
6.7°C
2.0°F

1.4°C

1.1°C

70.0°F
21.1°C
70.0°F
21.1°C
20.0°F
11.1°C
40°F
22.0°C

44.0°F
6.7°C
44.0°F
6.7°C
10.0°F
5.6°C
20°F
11.0°C

*

Refer to Engineering Guide for operation below 30°F (-1.1°C). Alternate thermal expansion valves must be used
below 30°F (-1.1°C).

*

When using glycol, Leaving Chilled Liquid Setpoint should not be set below 20°F (-6.7°C).

** Do not exceed 55°F (12.8°C) setpoint before contacting the nearest York Office for application
guidelines.

76

YORK INTERNATIONAL

FORM 150.62-NM1

SCHEDULE/ADVANCE DAY key
The SCHEDULE is a seven day daily schedule that allows one start/stop time per day. The schedule can be
programmed Monday through Sunday with an alternate
holiday schedule available. If no start/stop times are programmed, the unit will run on demand, providing the
chiller is not shut off on a unit or system shutdown. The
daily schedule is considered “not programmed” when
the times in the schedule are all zeros (00:00 AM).
To set the schedule, press the SCHEDULE/ADVANCE
DAY key. The display will immediately show the following display.
M O N

S T A R T
S T O P

=
=

0 0 : 0 0
0 0 : 0 0

A M
A M

The line under the 0 is the cursor. If the value is wrong,
it may be changed by using the UP and DOWN arrow
keys until correct. Pressing the ENTER/ADV key will
enter the times and then move the cursor to the minute
box. The operation is then repeated if necessary. This
process may be followed until the hour, minutes, and
meridian (AM or PM) of both the START and STOP
points are set. After changing the meridian of the stop
time, pressing the ENTER/ADV key will advance the
schedule to the next day.

Whenever the daily schedule is
changed for Monday, all the other days
will change to the new Monday schedule. This means if the Monday times
are not applicable for the whole week
then the exceptional days would need
to be reprogrammed to the desired
schedule.

YORK INTERNATIONAL

To page to a specific day press the SCHEDULE/ADVANCE DAY key. The start and stop time of each day
may be programmed differently using the UP and
DOWN arrow, and ENTER/ADV keys.
After SUN (Sunday) schedule appears on the display a
subsequent press of the SCHEDULE/ADVANCE DAY
key will display the Holiday schedule. This is a two part
display. The first reads:
H O L

S T A R T
S T O P

=
=

0 0 : 0 0
0 0 : 0 0

A M
A M

The times may be set using the same procedure as
described above for the days of the week. After changing the meridian of the stop time, pressing the ENTER/
ADV key will advance the schedule to the following display:
S _ M
T
W
T
F
S
H O L I D A Y
N O T E D
B Y

*

The line below the empty space next to the S is the
cursor and will move to the next empty space when the
ENTER/ADV key is pressed. To set the Holiday, the
cursor is moved to the space following the day of the
week of the holiday and the UP arrow key is pressed.
An * will appear in the space signifying that day as a
holiday. The * can be removed by pressing the DOWN
arrow key.
The Holiday schedule must be programmed weeklyonce the holiday schedule runs , it will revert to the normal daily schedule.

77

2

Unit Controls

PROGRAM key
There are six operating parameters under the PROGRAM key that are programmable. These setpoints can
be changed by pressing the PROGRAM key, and then
the ENTER/ADV key to enter Program Mode. Continuing to press the ENTER/ADV key will display each operating parameter. While a particular parameter is being displayed, the UP and DOWN arrow keys can be
used to change the value. After the value is changed,
the ENTER/ADV key must be pressed to enter the data
into memory. Table 29 shows the programmable limits
and default values for each operating parameter.
Following are the displays for the programmable values in the order they appear:
@ D I S C H A R G E
C U T O U T
=

P R E S S U R E
3 9 5
P S I G

DISCHARGE PRESSURE CUTOUT is the discharge
pressure at which the system will shutdown as monitored by the optional discharge transducer. This is a
software shutdown that acts as a backup for the mechanical high pressure switch located in the refrigerant
circuit. The system can restart when the discharge pressure drops 40 PSIG (2.76 BARG) below the cutout point.
If the optional discharge pressure transducer is not installed, this programmable safety would not apply. It
should be noted that every system has a mechanical
high pressure cutout that protects against excessive high
discharge pressure regardless of whether or not the optional discharge pressure is installed.
S U C T I O N
C U T O U T
=

P R E S S U R E
4 4 . 0
P S I G

The SUCTION PRESSURE CUTOUT protects the
chiller from an evaporator freeze-up. If the suction pressure drops below the cutout point, the system will shut
down.

78

There are some exceptions when the
suction pressure is permitted to temporarily drop below the cutout point.
Details are explained under the topic
of System Safeties.
L OW
A M B I E N T
T E M P
C U T O U T
=
2 5 . 0 ° F

The LOW AMBIENT TEMP CUTOUT allows the user
to select the chiller outside ambient temperature cutout
point. If the ambient falls below this point, the chiller will
shut down. Restart can occur when temperature rises
2°F (1.11°C) above the cutout setpoint.
L E A V I N G
L I Q U I D
T E M P
C U T O U T
=
3 6 . 0 ° F

The LEAVING LIQUID TEMP CUTOUT protects the
chiller from an evaporator freeze-up. Anytime the leaving chilled liquid temperature drops to the cutout point,
the chiller shuts down. Restart will be permitted when
the leaving chilled liquid temperature rises 2°F (1.11°C)
above the cutout setpoint.
When water cooling mode is programmed (Options key),
the value is fixed at 36.0°F (2.22°C) and cannot be
changed. Glycol cooling mode can be programmed to
values listed in Table 28.
A N T I
=

R E C Y C L E
6 0 0
S E C

T I M E

The anti-recycle timer message shows the amount of
time left on the respective systems anti-recycle timer.
The programmed ANTI RECYCLE TIME will start to
count down at the start of the systems number one compressor. In effect, this is the minimum time start-to-start
on the respective systems number one compressor.

YORK INTERNATIONAL

FORM 150.62-NM1

Another anti-recycle timer is started each time the systems number one compressor cycles off. This anti-recycle time is fixed at 120 seconds and starts to countdown when the systems number one compressor cycles
off.
The anti-recycle message is displayed when the system is unable to start due to either of the anti-recycle
timers being active (counting down). The actual time
displayed will be the longer of the two timers, start-tostart or stop-to-start.
F A N
C O N T R O L
O N
P R E S S U R E = XX X P S I G

The Fan Control On Pressure is the programmed pressure value that is used to stage the condenser fans on,
in relation to discharge pressure. Refer to Condenser
Fan Control in the UNIT OPERATION section and
Tables 38, 39, and 40, 41.

F A N
D I F F E R E N T I A L
O F F
P R E S S U R E = X X X PS I G

The Fan Differential Off Pressure is the programmed
differential pressure value that is used to stage the condenser fans off, in relation to discharge pressure. Refer
to Condenser Fan Control in the UNIT OPERATION
section and Tables 38, 39 and 40, 41.
T O T A L
N U M B E R
O F
C OM P R E S S O R S
=
6

The TOTAL NUMBER OF COMPRESSORS are the
amount of compressors in the chiller, and determines
the stages of cooling available. Notice in Table 29 the
chiller is a single or dual refrigerant circuit.

This must be programmed correctly to
assure proper chiller operation.

TABLE 29 – PROGRAM KEY LIMITS AND DEFAULTS
PROGRAM VALUE
DISCHARGE PRESSURE CUTOUT

MODEL
—
WATER COOLING

SUCTION PRESSURE CUTOUT
GLYCOL COOLING
STANDARD AMBIENT
LOW AMBIENT TEMP. CUTOUT
LOW AMBIENT

LEAVING CHILLED LIQUID
TEMP. CUTOUT

WATER COOLING
GLYCOL COOLING

ANTI-RECYCLE TIMER

—

FAN CONTROL ON-PRESSURE

—

FAN DIFFERENTIAL OFF-PRESSURE

—

TOTAL NUMBER OF COMPRESSORS

SINGLE SYSTEM
TWO SYSTEMS

YORK INTERNATIONAL

LOW LIMIT
200 PSIG
13.8 BARS
44.0 PSIG
3.03 BARS
20.0 PSIG
1.38 BARS
25.0°F
-3.9°C
0°F
-17.8°C

HIGH LIMIT
399 PSIG
27.5 BARS
70.0 PSIG
4.83 BARS
70.0 PSIG
4.83 BARS
60.0°F
15.6°C
60.0°F
15.6°C

—

—

8.0°F
-13.3°C
300 SEC.
225 PSIG
15.5 BARS
50 PSIG
3.45 BARS
2
4

36.0°F
2.2°C
600 SEC.
300 PSIG
20.7 BARS
150 PSIG
10.3 BARS
3
6

DEFAULT
395 PSIG
27.2 BARS
44.0 PSIG
3.03 BARS
44.0 PSIG
3.03 BAR
25.0°F
-3.9°C
25.0°F
-3.9°C
36°F
2.2°C
36.0°F
2.2°C
600 SEC.
230 PSIG
15.9 BARS
80 PSIG
5.52 BARS
3
6

79

2

Unit Controls

Table 30 provides a quick reference of the setpoints list
for the Setpoints Keys.

TABLE 30 – SETPOINTS QUICK REFERENCE LIST

Quick Reference Programming Chart
Setpoints Section
Cooling Setpoints Key
(press key to adv.)

Schedule/
Advance Day Key

Program Mode
(press enter to adv.)

Local Leaving
Water Temp Control
(Display Only)

Mon. – Sun.
&
Holiday
Schedule

Discharge
Pressure
Cutout

Chilled Liquid
Setpoint
&
Range

Suction
Pressure
Cutout

Remote Setpoint
&
Range
(Display Only)

Low Ambient Temp.
Cutout

EMS - PWM
Remote Temp
Reset Setpoint

Leaving Liquid
Temperature
Cutout

Anti-Recycle
Timer

Fan Control
On-Pressure

Fan Differential
Off-Pressure

Total Numbers
of
Compressors

LD03685

80

YORK INTERNATIONAL

FORM 150.62-NM1

“UNIT” KEYS

2
00070VIP

OPTIONS key

This keeps system 2 off

There are eleven programmable options (nine for units
with a single refrigerant system) under the OPTIONS
key. The OPTIONS key is used to scroll through the list
of options by repeatedly pressing the OPTIONS key .
After the selected option has been displayed, the UP
and DOWN arrow keys are then used to change that
particular option. After the option is changed, the ENTER/ADV key must be pressed to enter the data into
memory. Table 31 shows the programmable options.
Following are the displays in the order they appear:

or
S Y S
S Y S

1
2

SW I T C H
SW I T C H

O F F
O N

This keeps system 1 off
Option 3 – Unit Type
U N I T
T Y P E
L I Q U I D
C H I L L E R

Option 1 – Language
D I S P L A Y
L A N G U A G E
E N G L I S H

selected for YCAL Chillers
or

Option 2 – System Switches (two system units only)
S Y S
S Y S

1
2

SW I T C H
SW I T C H

O N
O N

U N I T
T Y P E
C O N D E N S I N G
U N I T

selected for YCUL Condensing units.
This allows both systems to run

Option 4 – Chilled Liquid Cooling Type

or
S Y S
S Y S

1
2

SW I T C H
SW I T C H

O N
O F F

C H I L L E D
L I Q U I D
WA T E R

The chilled liquid is water. The Cooling Setpoint can be
programmed from 40°F to 70°F (4.4°C to 21.1°C)
YORK INTERNATIONAL

81

Unit Controls

or
A B C D
E FI G
J K L
N O
C H
L H
L EI D
L M
I Q
U PI Q
D R S T
1 2 3 4 5 6 7 G
8 L
9 Y
0 C
° O
, L. / % - ( ) * X

ate on locally programmed values and ignore all commands from the remote devices. The chiller will communicate and send data to the remote monitoring devices.
or

The chilled liquid is glycol. The Cooling Setpoint can be
programmed from 10°F to 70°F (-12.2°C to 21.1°C).

Option 5 – Ambient Control Type
A B C
D B
E FI G
L M
P Q
A M
E H
N TI J K
C O
N N
T O
R O
L R S T
1 2 3 4 5 6 S
7 T
8 A
9 N
0 D
° A, R. D/ % - ( ) * X

The low ambient cutout is adjustable from 25°F to 60°F
(-3.9°C to 15.6°C).

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

MO D E

This mode should be selected when an ISN or RCC
control is to be used to control the chiller. This mode will
allow the ISN to control the following items: Remote
Start/Stop, Cooling Setpoint, Load Limit, and History
Buffer Request. If the unit receives no valid ISN transmission for 5 minutes, it will revert back to the locally
programmed values.
Option 7 – Unit Control Mode

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

The low ambient cutout is programmable down to 0°F
(-17.8°C). A low ambient kit MUST be installed for this
option to be chosen.

C O N T R O L
M O D E
R E T U R N
L I Q U I D

Unit control is based on return chilled liquid temp. It can
only be selected on units that have 4 or 6 compressors
(dual system units).
or

Option 6 – Local/Remote Control Type
L O C A L

/

R E M O T E
L O C A L

M O D E L

C O N T R O L
M O D E
L E A V I N G
L I Q U I D

Unit control is based on leaving chilled liquid temp.
When programmed for LOCAL, an ISN or RCC control
can be used to monitor only. The micro panel will oper-

82

Refer to section on Capacity Control for details on loading and unloading sequences.

YORK INTERNATIONAL

FORM 150.62-NM1

Option 8 – Units Type
D I S P L A Y
U N I T S
I M P E R I A L

Display messages will show units of measure in
Imperial units (°F or PSI).
or

Condenser fans are controlled by ambient temperature and discharge pressure. This mode must be chosen if the discharge pressure transducers are not installed, or if the fan cycling is a concern.
Option 11 – Manual Override Mode
M A N U A L

D I S P L A Y
U N I T S
S I

O V E R R I D E
D I S A B L E D

M O D E

This option allows overriding of the daily schedule that
Display messages will show units of measure in SI
units (°C or Bar).

is programmed. MANUAL OVERRIDE MODE-DISABLED
indicates that override mode has no effect.
or

Option 9 – Lead/Lag Type (two systems only)
M A N U A L
L E A D / L A G
C O N T R O L
M A N U A L
S Y S
1
L E A D

SYS 1 selected as lead compressor.
or
L E A D / L A G
C O N T R O L
M A N U A L
S Y S
2
L E A D

SYS 2 selected as lead compressor.
or
L E A D / L A G
C O N T R O L
A U T OM A T I C

In this mode the micro determines which system is assigned to the lead and lag. A new lead/lag assignment
is made whenever all compressors shut down. The micro will then assign the “lead” to the compressor with
the shortest average run time.

Option 10 – Condensed Fan Control Mode

Condenser fans are controlled by discharge pressure
only. This mode may only be chosen when discharge
pressure transducers are installed, or if fan cycling is
not a concern.
or
F A N
A M B I E N T

YORK INTERNATIONAL

C O N T R O L
&
D S C H
P R E S S

M O D E

2

Manual Override Mode is enabled. This is a service function and when enabled, will allow the unit to start when
shut down on the daily schedule. It will automatically be
disabled after 30 minutes.
CLOCK
The CLOCK display shows the current day, time, and
date. Pressing the CLOCK key will show the current
day, time, and date.
It is important that the date and time be correct, otherwise the daily schedule will not function as desired if
programmed. In addition, for ease of troubleshooting
via the History printouts, the day, time, and date should
be correct.
To change the day, time, and date press the CLOCK
key. The display will show something similar to the following:
T O D A Y
1

F A N
C O N T R O L
D I S C H A R G E
PR E S S U R E

O V E R R I D E
E N A B L E D

I S
F R I
0 8 : 5 1 A M
M A Y
9 8

The line under the F is the cursor. If the day is correct,
press the ENTER/ADV key. The cursor will move under
the 0 in 08 hours. If the day is incorrect, press the UP or
DOWN arrow keys until the desired day is displayed
and then press the ENTER/ADV key at which time the
day will be accepted and the cursor will move under the
0. In a similar manner, the hour, minute, meridian, month,
day, and year may be programmed, whenever the cursor is under the first letter/numeral of the item.

Jumper J11 on the microboard must
be set to the “CLKON” position to turn
on the clock. If this is not done the
clock will not function.
83

Unit Controls

Table 31 provides a quick reference list for the Unit key
setpoints.

TABLE 31 – UNIT KEYS PROGRAMMING QUICK REFERENCE LIST

Quick Reference Programming Chart
Unit Keys Section

Options Key
(press key to adv.)

Clock

Display Language

Day – Time – Date

System Switches
on/off
Unit Type
(Chiller or Condensing Unit)
Chilled Liquid Type
(water or glycol)
Ambient Control
(standard or low)
Local/Remote Mode
Unit Control
Mode
(Based on Unit Type)
Display Units
(English or Metric)
Lead/Lag Control
Fan Control Mode
Override Mode
LD03686

84

YORK INTERNATIONAL

FORM 150.62-NM1

UNIT OPERATION
CAPACITY CONTROL
To initiate the start sequence of the chiller, all run permissive inputs must be satisfied (flow/remote start/stop
switch), and no chiller or system faults exist.
The first phase of the start sequence is initiated by the
Daily Schedule Start or a Remote Cycling Device. If the
unit is shut down on the daily schedule, the chilled water pump microboard contacts (TB5 3-4) will close when
the daily schedule start time has been reached. Once
flow has been established and the flow switch closes,
capacity control functions are initiated.
If unit cycling is accomplished with a remote cycling
device wired in series with the flow switch, the chilled
water pump contacts will always be energized as long
as the unit switch is turned on. When the flow switch
and remote cycling contacts are closed, the capacity
control functions will be initiated.
It should be noted that the chilled water pump contacts
(TB5 3-4) are not required to be used to cycle the chilled
water pump. However, in all cases the flow switch must
be closed to allow unit operation.
The control system will evaluate the need for cooling by
comparing the actual leaving or return chilled liquid temperature to the desired setpoint, and regulate the leaving or return chilled liquid temperature to meet that desired setpoint.
LEAVING CHILLED LIQUID CONTROL
The setpoint, when programmed for Leaving Chilled Liquid Control, is the temperature the unit will control to
within +/- the cooling range. The Setpoint High Limit is
the Setpoint plus the Cooling Range. The Setpoint Low
Limit is the Setpoint minus the Cooling Range. See Figure 6.

YORK INTERNATIONAL

If the leaving chilled liquid temperature is above the
Setpoint High Limit, the lead compressor on the lead
system will be energized along with the liquid line solenoid. Upon energizing any compressor, the 60 second
Anti-Coincidence timer will be initiated.
If after 60 seconds of run-time the leaving chilled liquid
temperature is still above the Setpoint High Limit, the
next compressor in sequence will be energized. Additional loading stages are energized at a rate of once
every 60 seconds if the chilled liquid temperature remains above the Setpoint High Limit. In this case, the
load timer will be 60 seconds.

2
If the chilled liquid temperature falls below the Setpoint
High Limit but is greater than the Setpoint Low Limit,
loading and unloading do not occur. This area of control is called the control range.
If the chilled liquid temperature drops to less than 0.5°F
(.28°C) below the Setpoint Low Limit, unloading occurs
at a rate of 60 seconds. If the chilled liquid temperature
falls to a value greater than 0.5°F (.28°C) below the
Setpoint Low Limit but not greater than 1.5°F (.83°C)
below the Setpoint Low Limit, unloading occurs at a rate
of 30 seconds. If the chilled liquid temperature falls to a
value greater than 1.5°F (.83°C) below the Setpoint Low
Limit, unloading occurs at a rate of 20 seconds.
The leaving chilled liquid setpoint is programmable from
40°F to 70°F (4.4°C to 21.1°C) in water chilling mode
and from 10°F to 70°F (-12.2°C to 21.1°C) in glycol chilling mode. In both modes, the cooling range can be from
+/-1.5°F to +/-2.5°F (+/-.83°C to 1.39°C).
The sequences of Capacity Control (compressor staging) for loading and unloading are shown in Table 32
through Table 35.

85

Unit Controls

20 sec.
unloading

LWT

30 sec.
unloading

42.5°F
(5.8°C)

60 sec.
unloading

43.5°F
(6.4°C)

control range
(no compressor staging)

44.0°F
(6.7°C)
Low Limit

46.0°F
(7.8°C)
Setpoint

60 sec.
loading

48.0°
(8.9°C)
High limit

Leaving Water Temp. Control – Compressor Staging
Setpoint = 46.0°F (7.8°C) Range = +/- 2°F(1.1°C)

FIG. 6 – LEAVING WATER TEMPERATURE CONTROL

TABLE 32 – LEAVING CHILLED LIQUID CONTROL FOR 6 COMPRESSORS (8 STEPS)
*STEP
0
1
2
3
4
5
6
7
8

LEAD SYSTEM
COMP 1
COMP 2
OFF
OFF
ON+HG
OFF
ON
OFF
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

COMP 3
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON

SEE NOTE 1
SEE NOTE 2
SEE NOTE 3

COMP 1
OFF
OFF
OFF
ON
OFF
ON
ON
ON
ON

LAG SYSTEM
COMP 2
COMP 3
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON

TABLE 33 – LEAVING CHILLED LIQUID CONTROL FOR 4 COMPRESSORS (6 STEPS)
*STEP
0
1
2
3
4
5
6

LEAD SYSTEM
COMP 1
OFF
ON+HG
ON
ON
ON
ON
ON

COMP 2
OFF
OFF
OFF
OFF
ON
ON
ON

SEE NOTE 1
SEE NOTE 2
SEE NOTE 3

COMP 1
OFF
OFF
OFF
ON
OFF
ON
ON

LAG SYSTEM
COMP 2
OFF
OFF
OFF
OFF
OFF
OFF
ON

* STEP can be viewed using the OPER DATA key and scrolling to COOLING DEMAND.

86

YORK INTERNATIONAL

FORM 150.62-NM1

TABLE 34 – LEAVING CHILLED LIQUID CONTROL FOR 3 COMPRESSORS (SINGLE SYSTEM)
*STEP
0
1
2
3
4

COMP 1
OFF
ON+HG
ON
ON
ON

COMP 2
OFF
OFF
OFF
ON
ON

COMP 3
OFF
OFF
OFF
OFF
ON

SEE NOTE 1

TABLE 35 – LEAVING CHILLED LIQUID CONTROL FOR 2 COMPRESSORS (SINGLE SYSTEM)
*STEP
0
1
2
3

COMP 1
OFF
ON+HG
ON
ON

COMP 2
OFF
OFF
OFF
ON

SEE NOTE 1

2

Notes:
1. Step 1 is Hot Gas Bypass and is skipped when loading occurs. Hot Gas Bypass operation is inhibited during Pumpdown. For Leaving
Chilled Liquid Control the Hot Gas Bypass solenoid is energized only when the lead compressor is running and the LWT < SP, the Hot Gas
Bypass solenoid is turned off when the LWT > SP + CR/2
2. Step 3 is skipped when loading occurs.
3. Step 4 is skipped when unloading occurs.
* STEP can be viewed using the OPER DATA key and scrolling to COOLING DEMAND.

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87

Unit Controls

RETURN CHILLED LIQUID CONTROL
(DUAL SYSTEM 4 AND 6 COMP UNITS ONLY)
Return chilled liquid control is based on staging the compressors to match the cooling load. The chiller will be
fully loaded when the return water temperature is equal
to the Cooling Setpoint plus the Range Setpoint. The
chiller will be totally unloaded (all compressors off) when
the return water temperature is equal to the Cooling
Setpoint. At return water temperatures between the
Cooling Setpoint, and Cooling Setpoint plus Range
Setpoint, compressor loading and unloading will be determined by the formulas in Table 37 or Table 38.

determining the separation between segments. Note
also that the Cooling Setpoint is the point at which all
compressors are off, and Cooling Setpoint plus Range
Setpoint is the point all compressors are on. Specifically, if the return water temperature is 55°F (12.8°C),
then all compressors will be on, providing full capacity.
At nominal gpm, this would provide approximately 45°F
(7.2°C) leaving water temperature out of the evaporator.

Normal loading will occur at intervals of 60 seconds according to the temperatures determined by the formulas. Unloading will occur at a rate of 30 seconds according the temperatures determined in the formulas.

If the return water temperature drops to 53.3°F (11.8°C),
one compressor would cycle off leaving five compressors running. The compressors would continue to cycle
off approximately every 1.7°F (.94°C), with the exception of hot gas bypass. Notice that the hot gas bypass
would be available when the return water temperature
dropped to 46.25°F (7.9°C). At this point one compressor would be running.

The return chilled liquid setpoint is programmable from
40°F to 70°F (4.4°C to 21.1°C) in water chilling mode
and from 10°F to 70°F (-12.2°C to 21.1°C) in glycol chilling mode. In both modes, the cooling range can be from
4°F to 20°F (2.2° to 11.1°C).

Should the return water temperature rise from this point
to 46.7°F (8.2°C), the hot gas bypass would shut off,
still leaving one compressor running. As the load increased, the compressors would stage on every 1.7°F
(.94°C).

As an example of compressor staging (refer to Table
36 and Table 37), a chiller with six compressors using a
Cooling Setpoint programmed for 45°F (7.20°C) and a
Range Setpoint of 10°F (5.56°C). Using the formulas in
Table 37, the control range will be split up into six (seven
including hot gas) segments, with the Control Range

Also notice that Tables 37 and 38 not only provide the
formulas for the loading (ON POINT) and unloading
(OFF POINT) of the system, the “STEP” is also shown
in the tables. The “STEP” is that sequence in the capacity control scheme that can be viewed under the
OPER DATA key. Please refer to the section on the DISPLAY/PRINT keys for specific information on the OPER
DATA key.

88

YORK INTERNATIONAL

FORM 150.62-NM1

Compressor Staging for Return Water Control –
6 Compressors
Cooling Setpoint = 45° F (7.2° C) Range = 10° F (5.6° C)
TABLE 36 – COMPRESSOR STAGING FOR RETURN WATER CONTROL
# OF COMP ON
RWT

0
45°F
(7.2°C)

*1+HG
46.25°F
(7.9°C)

1
46.7°F
(8.2°C)

2
48.3°F
(9.1°C)

3
50.0°F
(10.0°C)

4
51.7°F
(11.0°C)

5
53.4°F
(11.9°C)

6
55.0°F
(12.8°C)

*Unloading only

TABLE 37 – RETURN CHILLED LIQUID CONTROL FOR 6 COMPRESSORS (8 STEPS)
*STEP
0
1
2
3
4
5
6
7
8

COMPRESSOR ON POINT

COMPRESSOR OFF POINT

SP + CR/6
SP + 2*CR/6
SP + 2*CR/6
SP + 3*CR/6
SP + 4*CR/6
SP + 5*CR/6
SP + CR

SETPOINT
SP + CR/8
SP + CR/6
SP + CR/6
SP + 2*CR/6
SP + 3*CR/6
SP + 4*CR/6
SP + 5*CR/6

2
SEE NOTE 1
SEE NOTE 2
SEE NOTE 3

TABLE 38 – RETURN CHILLED LIQUID CONTROL FOR 4 COMPRESSORS (6 STEPS)
*STEP
0
1
2
3
4
5
6

COMPRESSOR ON POINT

COMPRESSOR OFF POINT

SP + CR/4
SP + 2*CR/4
SP + 2*CR/4
SP + 3*CR/4
SP + CR

SETPOINT
SP + CR/8
SP + CR/4
SP + CR/4
SP + 2*CR/4
SP + 3*CR/4

SEE NOTE 1
SEE NOTE 2
SEE NOTE 3

Notes:
1. Step 1 is Hot Gas Bypass and is skipped when loading occurs. Hot Gas Bypass operation is inhibited during Pumpdown.
2. Step 3 is skipped when loading occurs.
3. Step 4 is skipped when unloading occurs.
* STEP can be viewed using the OPER DATA key and scrolling to COOLING DEMAND.

YORK INTERNATIONAL

89

Unit Controls

EVAPORATOR PUMP CONTROL

CONDENSER FAN CONTROL

The evaporator pump dry contacts (CTB2 - terminals
23 - 24) are energized when any of the following conditions are true:
1. Low Leaving Chilled Liquid Fault
2. Any compressor is running
3. Daily Schedule is not programmed OFF and
Unit Switch is ON.

Condenser fan operation must be programmed with the
Options key under “Fan Control.” Condenser fan control can be selected for Ambient Temp. and Disch. Pressure, or Discharge Pressure Only.

The pump will not run if the micro panel has been powered up for less than 30 seconds or if the pump has run
in the last 30 seconds to prevent pump motor overheating.
EVAPORATOR HEATER CONTROL
The evaporator heater is controlled by ambient air temperature. When the ambient temperature drops below
40°F (4.4°C) the heater is turned on. When the temperature rises above 45°F (7.2°C) the heater is turned
off. An under voltage condition will keep the heater off
until full voltage is restored to the system.

TABLE 39 –

The condenser fan control by “Ambient Temperature
and Discharge Pressure” is a feature that is integral to
the standard software control. If the optional discharge
transducer is not installed, the condenser fans will operate based on outdoor ambient temperature only. See
Table 39.
The condenser fan control by “Discharge Pressure” is
a feature that can be selected if the discharge pressure
transducer is installed and fan recycling is not a concern. Fan control by discharge pressure will work according to Table 40. The fan control on-pressure
(ctrl_press) and fan differential off-pressure (diff_press)
are programmable under the PROGRAM key.

CONDENSER FAN CONTROL USING OUTDOOR AMBIENT TEMPERATURE AND DISCHARGE
PRESSURE

FAN STAGE
1
1 FAN FWD
2
2 FANS FWD

ON
OAT >25° F (-3.9°C)
OR
DP > ctrl_press
OAT >45° F (7.2°C)
OR
DP > ctrl_press + 20 PSIG (1.38 Bars)

OFF
OAT < 20° F (-6.7°C)
AND
DP < ctrl_press - diff_press
OAT < 40° F (4.4°C)
AND
DP < ctrl_press - diff_press + 20 PSIG (1.38 Bars)

TABLE 40 – CONDENSER FAN CONTROL USING DISCHARGE PRESSURE ONLY
FAN STAGE

1
1 FAN FWD
2
2 FANS FWD

90

ON
DP > ctrl_press

OFF
DP < ctrl_press - diff_press

DP > ctrl_press + 20 PSIG (1.38 Bars) DP < ctrl_press - diff_press + 20 PSIG (1.38 Bars)

YORK INTERNATIONAL

FORM 150.62-NM1

LOW AMBIENT CONDENSER FAN CONTROL
For unit operation below 25°F (-3.9°C) a low ambient
kit is required. The kit consists of a discharge pressure
transducer(s) and reversing contactors.
With the low ambient kit installed and the unit programmed for low ambient operation, the condenser fans
will operate as shown in Tables 41 and 42.

Again, notice that condenser fan operation can be programmed for either “temperature and discharge pressure control,” or “discharge pressure control only” as
described under Condenser Fan Control.
The fan control on-pressure (ctrl_press) and the fan deferential off-pressure (diff_press) are programmable under the PROGRAM key.

TABLE 41 –
LOW AMBIENT CONDENSER FAN CONTROL – AMBIENT TEMPERATURE AND DISCHARGE
PRESSURE CONTROL
FAN STAGE
1
1 FAN REV
2
1 FAN FWD
3
2 FANS FWD

ON
OAT >25° F (-3.9°C)
OR
DP > ctrl_press
OAT >45°F (7.2°C)
OR
DP > ctrl_press + 20 PSIG (1.38 Bars)
OAT > 65°F (18.3°C)
OR
DP > ctrl_press + 40 PSIG (2.76 Bars)

OFF
OAT < 20° F (-6.7°C)
AND
DP < ctrl_press - diff_press
OAT < 40°F (-4.40°C)
AND
DP < ctrl_press - diff_press + 20 PSIG (1.38 Bars)
OAT < 60°F (15.6°C)
AND
DP < ctrl_press - diff_press + 40 PSIG (2.76 Bars)

TABLE 42 – LOW AMBIENT CONDENSER FAN CONTROL – DISCHARGE PRESSURE CONTROL
FAN STAGE
1
1 FAN REV
2
1 FAN FWD
3
2 FANS FWD

YORK INTERNATIONAL

ON

OFF

DP > ctrl_press

DP < ctrl_press - diff_press

DP > ctrl_press + 20 PSIG (1.38 Bars)

DP < ctrl_press - diff_press + 20 PSIG (1.38 Bars)

DP > ctrl_press + 40 PSIG (2.76 Bars)

DP < ctrl_press - diff_press + 40 PSIG (2.76 Bars)

91

2

Unit Controls

PUMPDOWN (LLSV) CONTROL
Each system has a Pumpdown feature upon shut-off.
On a non-safety, non-unit switch shutdown, all compressors but one in the system will be shut off. The LLSV
will also be turned off. The final compressor will be allowed to run until the suction pressure falls below the
cutout or for 180 seconds, which ever comes first.
Manual pumpdown from the keypad is not possible.
LOAD LIMITING
Load Limiting is a feature that prevents the unit from
loading beyond the desired value. 2 and 4 compressor
units can be load limited to 50%. This would allow only
1 compressor per system to run. 3 and 6 compressor
units can be load limited to 33% or 66%. The 66% limit
would allow up to 2 compressors per system to run,
and the 33% limit would allow only 1 compressor per
system to run. No other values of limiting are available.
There are two ways to load limit the unit. The first is
through remote communication via an ISN.
A second way to load limit the unit is through closing
contacts connected to the Load Limit (CTB1-Terminals
13-21) and PWM inputs (CTB1-Terminals 13-20). Stage
1 of load limiting involves closing the Load Limit input.
Stage 2 of load limiting involves closing both the Load
Limit and PWM inputs. The first stage of limiting is either 66% or 50%, depending on the number of compressors on the unit. The second stage of limiting is
33% and is only available on 3 and 6 compressor units.

Table 43 shows the load limiting permitted for the various number of compressors.

NOTE: Simultaneous operation of Load Limiting and
EMS-PWM Temperature Reset (described on
following pages) cannot occur.
COMPRESSOR RUN STATUS
Compressor run status is indicated by closure of contacts at CTB2 – terminals 25 to 26 for system 1 and
CTB2 – terminals 27 to 28 for system 2.
ALARM STATUS
System or unit shutdown is indicated by normally-open
alarm contacts opening whenever the unit shuts down
on a unit fault, or locks out on a system fault. System 1
alarm contacts are located at CTB2 - terminals 29 to
30. System 2 alarm contacts are located at CTB2 - terminals 31 to 32. The alarm contacts will close when
conditions allow the unit to operate.
COMPRESSOR SEQUENCING
The unit control will attempt to equalize the total run
hours on individual compressors within a system. When
a system is about to start, the compressor with the least
run time in that system will be the first to start. When
the system has to load, the next compressor to start
will be the one with the least run time that is currently
not running in that system.

TABLE 43 – COMPRESSOR OPERATION – LOAD LIMITING
COMPRESSORS IN UNIT
2
3
4
6

92

STAGE 1
50%
66%
50%
66%

STAGE 2
–
33%
–
33%

YORK INTERNATIONAL

FORM 150.62-NM1

EMS-PWM REMOTE TEMPERATURE RESET

BAS/EMS TEMPERATURE RESET OPTION

EMS-PWM Remote Temperature Reset is a value that
resets the Chilled Liquid Setpoint based on a PWM input (timed contact closure) to the microboard. This PWM
input would typically be supplied by an Energy Management System.

The Remote Reset Option allows the Control Center of
the unit to reset the chilled liquid setpoint using a 0 - 10
VDC input, a 4-20mA input, or a contact closure input.
The Remote Reset circuit board converts the signals
mentioned above into pulse width modulated (PWM)
signals which the microprocessor can understand.
Whenever a reset is called for, the change may be noted
by pressing the Cooling Setpoints key twice. The new
value will be displayed as “REM SETP = XXX°F”

A contact closure on the PWM Temp Reset input at
CTB 1 terminals 13 - 20, will reset the chilled liquid
setpoint based on the length of time the contacts remain closed. The maximum temperature reset is
achieved at a contact closure of 11 seconds. This is the
longest contact closure time allowed. One second is
the shortest time allowed and causes the Chilled Liquid
Setpoint to revert back to the Local programmed value.
The reset value is always added to the Chilled Liquid
Setpoint, meaning that this function never lowers the
Chilled Liquid Setpoint below the locally programmed
value, it can only reset to a higher value. The microboard must be refreshed between 30 seconds and 30
minutes. Any contact closure occurring sooner than 30
seconds will be ignored. If more than 30 minutes elapse
before the next contact closure, the setpoint will revert
back to the locally programmed value. The new chilled
liquid setpoint is calculated by the following equations:
setpoint = local chilled liquid setpoint + °reset
°reset = (Contact Closure - 1) x (*Max. Reset Value)
10
Example:
Local Chilled Liquid Setpoint = 45°F (7.22°C).
*Max Reset Value = 10°F (5.56°C)
Contact Closure Time = 6 Seconds.
(English)
(6 sec. - 1) (10°F/10) = 5°F Reset
So...the new chilled liquid setpoint = 45°F + 5°F= 50°F.
This can be viewed by pressing the Cooling Setpoints
key twice. The new value will be displayed as “REM SETP
= 50.0°F.”
(Metric)
(6 sec - 1) * (5.56°C/10) = 2.78°C
Reset Cooling Setpoint = 7.22°C + 2.78°C = 10.0°C
So...the new reset Cooling Setpoint = 7.22 °C + 2.78°C =
10°C. This can be viewed by pressing the Cooling Setpoints
key twice. The new value will be displayed as “REM SETP =
10.0°C.”

The optional Remote Reset option would be used when
reset of the chilled liquid setpoint is required and a PWM
signal (timed contact closure) cannot be supplied by an
Energy Management System. The Remote Temp. Reset Board will convert a voltage, current, or contact signal that is available from an EMS to a PWM signal, and
every 80 seconds provide a PWM input to the microboard. Figure 3 shows a diagram of the field and factory electrical connections.
If a 0 - 10VDC signal is available, it is applied to terminals A+ and A-, and jumpers are applied to JU4 and
JU2 on the reset board. This dc signal is conditioned to
a 1 - 11 second PWM output and supplied to the PWM
input on the microboard at CTB 1 terminals 13 - 20. To
calculate the reset chilled liquid setpoint for values between 0VDC and 10VDC use the following formula:
setpoint = local chilled liquid setpoint + °reset
°reset = (dc voltage signal) x (*Max Reset Value)
10
Example:
Local Chilled Liquid Setpoint = 45°F (7.22°C)
*Max Reset Value = 20°F (11.11°C)
Input Signal = 6 VDC
(English)
°reset = 6VDC x 20°F = 12°F reset
10
setpoint = 45 °F + 12 °F = 57°F
(Metric)
°reset = 6VDC x 11. 11°C = 6.67°C reset
10
setpoint = 7.22°C + 6.67°C = 13.89°C

* Max Reset Value is the “Max EMS-PWM Remote Temp. Reset” setpoint value described in the programming section under Cooling
Setpoints. Programmable values are from 2°F to 40°F (1.11°C to 22.22°C).
YORK INTERNATIONAL

93

2

Unit Controls

+

–

035-15961-000

035-15961-000
LD03875

FIG. 7 – FIELD AND FACTORY ELECTRICAL CONNECTIONS
OPTIONAL REMOTE TEMPERATURE RESET BOARD
If a 4-20mA signal is available, it is applied to terminals A+ and A- and jumpers are applied to JU5 and
JU3 on the reset board. The mA signal is conditioned to
a 1-11 second PWM output. The PWM output is then
supplied to the PWM input on the microboard at CTB 1
terminals 13 - 20. To calculate the chilled liquid setpoint
for values between 4mA and 20 ma use the following
formula:
setpoint = local chilled liquid setpoint + °reset
°reset = (mA signal - 4) x (*Max Reset Value)
16
Example:
Local Chilled Liquid Setpoint = 45° (7.22°C)
*Max Reset Value = 10°F (5.56°C)
Input Signal = 12 mA

A 240-24 Volt Ratio Transformer (T3)
is used to derive nominal 12 volt output from the 120 volt supply.

If the Contact Closure input is used. The connections
are made to terminals C and D and only jumper JUI
must be in place on the reset board. This input is used
when a single reset value is needed. When the contacts
are closed, the remote temperature reset board will convert this contact closure to a PWM signal that is applied
to CTB 1 terminals 13 - 20.

(English)
°reset = 8mA x 10°F = 5°F reset
16
setpoint = 45°F + 5°F = 50°F

To set the PWM output, the contacts must be closed on
inputs C - D, and potentiometer R11 (located on the front
edge of the PC board) is adjusted to 10VDC as measured at TP3 to terminal 10 on the circuit board. The
reset value will be the “Max EMS-PWM Remote Temp.
Reset” setpoint value programmed in the SETPOINTS
section under the Cooling Setpoints key.

(Metric)
°reset = 8mA x 5.56°C = 2.78°C reset
16
setpoint = 7.22°C + 2.78°C = 10.0°C

NOTE: The coil of any added relay used for reset must
be suppressed to prevent possible component
damage. Use YORK PN031-00808-000
suppressor.

* Max Reset Value is the “Max EMS-PWM Remote Temp. Reset” setpoint value described in the programming section under Cooling Setpoints.
Programmable values are from 2°F to 40°F (1.11°C to 11.11°C).

94

YORK INTERNATIONAL

FORM 150.62-NM1

SERVICE AND TROUBLESHOOTING
CLEARING HISTORY BUFFERS
The history buffers may be cleared by pressing the HISTORY key and then repeatedly pressing the UP arrow
key until you scroll past the last history buffer choice.
The following message will be displayed:
1

I N I T I A L I Z E
E N T E R
=

H I S T O R Y
Y E S

Pressing the ENTER/ADV key at this display will cause
the history buffers to be cleared. Pressing any other
key will cancel the operation.
SOFTWARE VERSION
The software version may be viewed by pressing the
HISTORY key and then repeatedly pressing the DOWN
arrow key until you scroll past the first history buffer
choice. The following message is an example of what
will be displayed:
S O F T WA R E
V E R S I O N
C . MM C . 0 1 . 0 1

Following is the order of digital outputs that will appear
as the ENTER/ADV key is pressed:\

SYS 1 COMPRESSOR 1
SYS 1 LIQUID LINE SOLENOID VALVE
SYS 1 COMPRESSOR 2
SYS 1 COMPRESSOR 3
SYS 1 HOT GAS BYPASS SOLENOID VALVE
SYS 2 COMPRESSOR 1
SYS 2 LIQUID LINE SOLENOID VALVE
SYS 2 COMPRESSOR 2
SYS 2 COMPRESSOR 3
SYS 1 FAN STAGE 1
SYS 1 FAN STAGE 2
SYS 1 FAN STAGE 3
SYS 2 FAN STAGE 1
SYS 2 FAN STAGE 2
SYS 2 FAN STAGE 3
EVAPORATOR HEATER
SYS 1 ALARM
SYS 2 ALARM
EVAPORATOR PUMP
SYS 1 & 2 ACCUM RUN TIME/STARTS

3

SERVICE MODE
Service Mode is a mode that allows the user to view all
the inputs to the microboard and enable or disable all of
the outputs (except compressors) on the unit. Some internal timers and counters will be viewable and modifiable as well.
To enter Service Mode, turn the unit switch off and press
the following keys in the sequence shown; PROGRAM,
UP ARROW, UP ARROW, DOWN ARROW, DOWN
ARROW, ENTER.
SERVICE MODE - DIGITAL OUTPUTS
After pressing the key sequence as described, the control will enter the Service Mode permitting the digital outputs (except compressors), operating hours, and start
counters to be viewed/modified. The ENTER/ADV key
is used to advance through the digital outputs. Using
the UP/DOWN ARROW keys will turn the respective
digital output on/off.

YORK INTERNATIONAL

Each display will also show the output connection on
the microboard for the respective digital output status
shown. For example:
S Y S
1
L L S V
T B 3 - 2
I S

S T A T U S
O F F

This display indicates that the system 1 liquid line solenoid valve is OFF, and the output connection from the
microboard is coming from terminal block 3 - pin 2.
Pressing the UP Arrow key will energize the liquid line
solenoid valve and OFF will change to ON in the display as the LLSV is energized.
The last display shown on the above list is for the accumulated run and start timers for each system. These
values can also be changed using the UP and Down
ARROW keys, but under normal circumstances would
not be advised.

95

Service and Troubleshooting

SERVICE MODE - INPUTS
After entering the Service Mode, all digital and analog
inputs to the microboard can be viewed by pressing the
OPER DATA key. After pressing the OPER DATA key,
the UP ARROW and DOWN ARROW keys are used to
scroll through the analog and digital inputs.
Following is the order of analog and digital inputs that
will appear when sequenced with the ARROW keys:
(analog inputs)

SYS 1 *SUCT PRESSURE
SYS 1 SPARE
SYS 1 **DISCH PRESSURE
SYS 1 SUCT TEMP (YCUL ONLY)
SYS 2 SUCT TEMP (YCUL ONLY)
SPARE
SPARE
AMBIENT AIR
LEAVING LIQUID
RETURN LIQUID
SYS 2 *SUCTION PRESSURE
SYS 2 SPARE
SYS 2 **DISCH PRESSURE
SYS 1 GRND FLT
SYS 2 GRND FLT
(binary inputs)

PWM TEMP RESET INPUT
LOAD LIMIT INPUT
FLOW SW / REM START
SYS 2 ZONE THERM (YCUL ONLY)
SINGLE SYSTEM SELECT
SYS 1 MP / HPCO INPUT
SYS 2 MP / HPCO INPUT

*

The analog inputs will display the input connection, the
temperature or pressure, and corresponding input voltage such as:
S Y S
1
S U C T
2 . 1
V D C
=

P R
8 1

J 4 - 1 0
P S I G

This example indicates that the system 1 suction pressure input is connected to plug 4 - pin 10 (J4-10) on the
microboard. It indicates that the voltage is 2.1 volts dc
which corresponds to 81 PSIG (5.6 bars) suction pressure.

The digital inputs will display the input connection and
ON/OFF status such as:
F L OW

SW / R E M
J 9 - 5
I S

S T A R T
O N

This indicates that the flow switch/remote start input is
connected to plug 9- pin 5 (J9-5) on the microboard,
and is ON (ON = +30 VDC unregulated input, OFF = O
VDC input on digital inputs).
CONTROL INPUTS/OUTPUTS
Tables 44 and 45 are a quick reference list providing
the connection points and a description of the binary
and analog inputs respectively. Table 46 lists the connection points for the outputs. All input and output connections pertain to the connections at the microboard.
Figure 8 illustrates the physical connections on the microboard.

The suction pressure transducer is optional on YCAL0014 - YCAL0060. A low pressure switch is standard on these models in place of the
suction transducer.

** The discharge pressure transducer is optional on all models.

96

YORK INTERNATIONAL

FORM 150.62-NM1

TABLE 44 – MICROBOARD BINARY INPUTS
*J9-1 30VDC UNREGULATED SUPPLY
J9-2 UNIT ON/OFF SWITCH
J9-3 PWM TEMP RESET
OR LOAD LIMIT STAGE 2 ON 3 & 6 COMP UNITS
J9-4 LOAD LIMIT STAGE 1
J9-5 FLOW SWITCH AND REMOTE START / STOP
(SYS 1 ZONE THERMOSTAT - YCUL ONLY)
J9-6 SYSTEM 2 ZONE THERMOSTAT - YCUL ONLY
J9-7 SINGLE SYSTEM SELECT
(JUMPER = SINGLE SYS, NO JUMPER=TWO
SYS)
J9-8 CR1 (SYS 1 MOTOR PROTECTOR / HIGH
PRESS CUTOUT)
J9-9 CR2 (SYS 2 MOTOR PROTECTOR / HIGH
PRESS CUTOUT)

TABLE 45 – MICROBOARD ANALOG INPUTS

TABLE 46 – MICROBOARD OUTPUTS
TB3-2
TB3-3
TB3-4
TB3-5
TB3-6
TB3-8
TB3-9
TB3-10
TB4-1
TB4-2
TB4-4
TB4-5
TB4-6
TB4-8
TB4-9
TB4-10
TB5-1
TB5-2
TB5-3

SYSTEM 1 COMPRESSOR 1
SYS 1 LIQUID LINE SOLENOID VALVE
SYSTEM 1 COMPRESSOR 2
SYSTEM 1 COMPRESSOR 3
SYSTEM 1 HOT GAS BYPASS VALVE
SYSTEM 2 COMPRESSOR 1
SYS 2 LIQUID LINE SOLENOID VALVE
SYSTEM 2 COMPRESSOR 2
SYSTEM 2 COMPRESSOR 3
SYS 1 CONDENSER FAN STAGE 1
SYS 1 CONDENSER FAN STAGE 2
SYS 1 CONDENSER FAN STAGE 3
SYS 2 CONDENSER FAN STAGE 1
SYS 2 CONDENSER FAN STAGE 2
SYS 2 CONDENSER FAN STAGE 3
EVAPORATOR HEATER
SYSTEM 1 ALARM
SYSTEM 2 ALARM
EVAPORATOR PUMP STARTER

J4-10 Sys 1 Suction Press Transducer or

Sys 1 Low Press Switch
J4-11 SPARE
J4-12 Sys 1 Discharge Pressure Transducer (optional)

3

J5-12 Sys 1 Suction Temp Sensor - YCUL Option
J5-13 Sys 2 Suction Temp Sensor - YCUL Option
J5-14 SPARE
J5-15 SPARE
J6-7
J6-8

Ambient Air Temperature Sensor
Leaving Chilled Liquid Temperature Sensor

J6-9

Return Chilled Liquid Temperature Sensor
or
Discharge Air Temp Sensor - YCUL Only

J7-10

Sys 2 Suct Press Transducer
or

Sys 2 Low Press Switch
J7-11 SPARE
J7-12 Sys 2 Discharge Pressure Transducer (optional)
J8-5 Sys 1 Ground Fault Circuit
J8-6

*

Sys 2 Ground Fault Circuit

The 30 dc unregulated supply is not an input. This voltage originates on the microboard and is used to supply the contacts for the binary
inputs.

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97

Service and Troubleshooting

TB1

TB2

TB5

J4

TB4
J8

CLOCK

J6

ON/OFF
JUMPER

J5

TB3

J7

J9

00071VIP

FIG. 8 – MICROBOARD LAYOUT
98

YORK INTERNATIONAL

FORM 150.62-NM1

CHECKING INPUTS AND OUTPUTS
BINARY INPUTS
Refer to the unit wiring diagram. All binary inputs are
connected to J9 of the microboard. The term “binary”
refers to two states –- either on or off. As an example,
when the flow switch is closed, 30 volts dc will be applied to J9, pin 5 (J9-5) of the microboard. If the flow
switch is open, 0 volts dc will then be present at J9-5.
Pin 1 of J9 is an unregulated 30VDC that is the dc voltage source used to supply the dc voltage to the various
contacts, unit switch, flow switch, etc. This dc source is
factory wired to CTB1, terminal 13. Any switch or contact used as a binary input would be connected to this
terminal, with the other end connecting to it’s respective
binary input on the microboard. Anytime a switch or contact is closed, 30VDC would be applied to that particular
binary input. Anytime a switch or contact is open, 0VDC
would be applied to that particular binary input.
Typically, as high as 34VDC could be measured for the
dc voltage on the binary inputs. This voltage is in reference to ground. The unit case should be sufficient as a
reference point when measuring binary input voltages.
ANALOG INPUTS – Temperature
Refer to the unit wiring diagram. Temperature inputs are
connected to the microboard on plug J6. These analog
inputs represent varying dc signals corresponding to
varying temperatures. All voltages are in reference to
the unit case (ground). Following are the connections
for the temperature sensing inputs:

TABLE 47 – OUTDOOR AIR SENSOR
TEMPERATURE/VOLTAGE/
RESISTANCE CORRELATION
TEMP °F
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
130

VOLTAGE
0.7
0.8
0.9
1.0
1.1
1.2
1.4
1.5
1.7
1.8
2.0
2.2
2.3
2.5
2.6
2.8
2.9
3.1
3.2
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1

RESISTANCE
85398
72950
62495
53685
46240
39929
34565
29998
26099
22673
19900
17453
15309
13472
11881
10501
9298
8250
7332
6530
5827
5209
4665
4184
3759
3382
3048

TEMP C°
-18
-15
-12
-9
-7
-4
-1
2
4
7
10
13
16
18
21
24
27
29
32
35
38
41
43
46
49
52
54

Outside Air Sensor
J6-4 = +5VDC regulated supply to sensor.
J6-7 = VDC input signal to the microboard. See Table
47 for voltage readings that correspond to
specific outdoor temperatures.
J6-1 = drain (shield connection = 0VDC)

YORK INTERNATIONAL

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Service and Troubleshooting

TABLE 48 – ENTERING AND LEAVING CHILLED
LIQUID TEMP. SENSOR
TEMPERATURE/VOLTAGE/
RESISTANCE CORRELATION
TEMP °F
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80

100

VOLTAGE
1.71
1.78
1.85
1.93
2.00
2.07
2.15
2.22
2.30
2.37
2.45
2.52
2.59
2.67
2.74
2.81
2.88
2.95
3.02
3.08
3.15
3.21
3.27
3.33
3.39
3.45
3.51
3.56
3.61
3.67
3.72
3.76
3.81
3.86
3.90
3.94
3.98
4.02
4.06
4.10
4.13

RESISTANCE
25619
24046
22580
21214
19939
18749
17637
16599
15629
14721
13872
13077
12333
11636
10982
10370
9795
9256
8750
8276
7830
7411
7017
6647
6298
5970
5661
5370
5096
4837
4593
4363
4145
3941
3747
3564
3392
3228
3074
2928
2790

TEMP °C
-18
-17
-16
-14
-13
-12
-11
-10
-9
-8
-7
-6
-4
-3
-2
-1
0
1
2
3
4
6
7
8
9
10
11
12
13
14
16
17
18
19
20
21
22
23
24
26
27

Entering Chilled Liquid Sensor
J6-6 = +5VDC regulated supply to sensor.
J6-9 = VDC input signal to the microboard. See Table
48 for voltage readings that correspond to
specific liquid temperatures.
J6-3 = drain (shield connection = 0VDC)
Leaving Chilled Liquid Temp. Sensor
J6-5 = +5VDC regulated supply to sensor.
J6-8 = VDC input signal to the microboard. See Table
48 for voltage readings that correspond to
specific liquid temperatures.
J6-2 = drain (shield connection = 0VDC)

YORK INTERNATIONAL

FORM 150.62-NM1

ANALOG INPUTS – Pressure
Refer to the unit wiring diagram. Pressure inputs are
connected to the microboard on plugs J4 and J7. These
analog inputs represent varying dc signals corresponding to varying pressures. All voltages are in reference
to the unit case (ground).
System 1 discharge and suction pressures will be connected to J4 of the microboard. System 2 discharge
and suction pressure transducers will be connected to
J7 of the microboard.
The discharge transducers are optional on all units. If
the discharge transducers are not installed, no connections are made to the microboard and the discharge
pressure readout on the display would be zero.
The suction pressure transducers are optional on
YCAL0014 - YCAL0060. If the suction transducers are
not installed, a mechanical low pressure switch will be
installed in its place, and the suction pressure readout
on the display will be 0 PSIG when the LP switch is
open, and 200 PSIG (13.79 BARG) when the LP switch
is closed.
The discharge transducers have a range from 0 to 400
PSIG. The output will be linear from .5VDC to 4.5VDC
over the 400 PSIG (27.5 BARG) range. Following is the
formula that can be used to verify the voltage output of
the transducer. All voltage reading are in reference to
ground (unit case).

YORK INTERNATIONAL

V = (Pressure in PSIG x .01) + .5
or
V = (Pressure in BARG x .145) + .5
where V = dc voltage output
Pressure = pressure sensed by transducer

The microboard connections for the Discharge Transducers:
System 1 Discharge Transducer
J4-7 = +5VDC regulated supply to transducer.
J4-12 = VDC input signal to the microboard. See the
formula above for voltage readings that
correspond to specific discharge pressures.
J4-8 = +5VDC return
J4-9 = drain (shield connection = 0VDC)
System 2 Discharge Transducer
J7-7 = +5VDC regulated supply to transducer.
J7-12 = VDC input signal to the microboard. See the
formula above for voltage readings that
correspond to specific discharge pressures.
J7-8 = +5VDC return
J7-9 = drain (shield connection = 0VDC)

101

3

Service and Troubleshooting

The suction transducers have a range from 0 to 200
PSIG (13.79 BARG). The output will be linear from .5
VDC to 4.5 VDC over the 200 PSIG (13.79 BARG)
range. Following is a formula that can be used to verify
the voltage output of the transducer. All voltage reading
are in reference to ground (unit case).

V = (Pressure in PSIG x .02) + .5
or
V = (Pressure in BARG x .29) + .5
where V = dc voltage input to micro
Pressure = pressure sensed by transducer

Following are the microboard connections for the Suction Transducer:
System 1 Suction Transducer
J4-5 = +5VDC regulated supply to transducer.
J4-10 = VDC input signal to the microboard. See
the formula above for voltage readings that
correspond to specific suction pressures.
J4-1 = +5VDC return
J4-2 = drain (shield connection = 0VDC)

If the optional Suction Transducer is not used on the
YCAL0014 - YCAL0060, a Low Pressure switch will be
used. Following are the microboard connections for the
Low Pressure switch.
System 1 Low Pressure Switch
J4-5 = +5VDC regulated supply to LP switch.
J4-10 = input signal to the microboard. 0VDC =
open switch / +5 VDC = closed switch.
J4-2 = drain (shield connection = 0VDC)

System 2 Low Pressure Switch
J7-5 = +5VDC regulated supply to LP switch.
J7-10 = input signal to the microboard. 0VDC = open
switch / +5VDC = closed switch.
J7-2 = drain (shield connection = 0VDC)
DIGITAL OUTPUTS
Refer to the unit wiring diagram and Table 46. The digital outputs are located on TB3, TB4, and TB5 of the
microboard. ALL OUTPUTS ARE 120VAC with the exception of TB5-3 to TB5-4. TB5-3 to TB5-4 are the contacts that can be used for an evaporator pump start signal. The voltage applied to either of these terminals would
be determined by field wiring.

System 2 Suction Transducer
J7-5 = +5VDC regulated supply to transducer.
J7-10 = VDC input signal to the microboard. See
the formula above for voltage readings that
correspond to specific suction pressures.
J7-1 = +5VDC return
J7-2 = drain (shield connection = 0VDC)

102

Each output is controlled by the microprocessor by
switching 120VAC to the respective output connection
energizing contactors, evap. heater, and solenoids according to the operating sequence.
120 vac is supplied to the microboard via connections
at TB3-1, TB3-7, TB4-3, and TB4-7. Figure 9 illustrates
the relay contact architecture on the microboard.

YORK INTERNATIONAL

FORM 150.62-NM1

.points (or pins), that represent one of twelve “buttons”
on the keypad.
Table 49 lists the key/pin assignments for the keypad.
Power to the microboard must be turned off, and
the ribbon cable disconnected from the microboard
prior to conducting the tests, or component damage may result.
After the ribbon cable is disconnected from microboard,
ohmmeter leads are connected to the pins representing the specific “button” to be tested. After connecting
the meter leads, the “button” being checked is pressed
and a reading of zero ohms should be observed. After
releasing the “button”, the resistance value should be
infinite (open circuit).

Pin 1 is usually identified by a stripe
on the ribbon cable

3
LD03842

FIG. 9 – MICROBOARD RELAY CONTACT
ARCHITECTURE
KEYPAD
The operator keypad is connected to the microboard
by a ribbon cable, which is connected to J2 on the microboard.
The integrity of a specific “button” on the keypad can be
verified by doing a continuity check across two specific

YORK INTERNATIONAL

TABLE 49 – KEYPAD PIN ASSIGNMENT MATRIX
KEYPAD
STATUS
OPER DATA
PRINT
HISTORY
UP ARROW
DOWN ARROW
ENTER/ADV
COOLING SETPOINTS
SCHEDULE/ADVANCE DAY
PROGRAM
OPTIONS
CLOCK

PIN CONNECTIONS
1 TO 5
1 TO 7
1 TO 6
1 TO 8
2 TO 5
2 TO 7
2 TO 6
2 TO 8
3 TO 5
3 TO 7
3 TO 6
3 TO 8

103

Service and Troubleshooting

OPTIONAL PRINTER INSTALLATION
The micro panel is capable of supplying a printout of
chiller conditions or fault shutdown information at any
given time. This allows operator and service personnel
to obtain data and system status with the touch of the
keypad. In addition to manual print selection, the micro
panel will provide an automatic printout whenever a fault
occurs. Detailed explanation of the print function is given
under “Print Key” located in the Keypad and Display section.
YORK recommends the field tested WEIGH-TRONIX
model 1220 printer (or former IMP 24). This is a compact low cost printer that is ideal for service work and
data logging.
The WEIGH-TRONIX printer can be obtained by contacting WEIGH-TRONIX for purchase information at:
WEIGH-TRONIX
2320 Airport Blvd.
Santa Rosa, CA 95402
Phone: 1-800-982-6622 or 1-707-527-5555
(International Orders Only)
The part number for the printer that is packaged specifically for YORK is P/N 950915576. The cable to connect
the printer can either be locally assembled from the parts
listed, or ordered directly from WEIGH-TRONIX under
part number 287-040018.

Parts
The following parts are required:
1. WEIGH-TRONIX model 1220 printer.
2. 2.25" (5.7cm) wide desk top calculator paper.
3. 25 ft. (7.62m) maximum length of Twisted Pair
Shielded Cable (minimum 3 conductor), #18 AWG
stranded, 300V minimum insulation.
4. One 25 pin Cannon connector and shell.
Connector: Cannon P/N DB-25P or equivalent.
Shell: Cannon P/N DB-C2-J9.
Assembly and Wiring
All components should be assembled and wired as
shown in Figure 10. Strip the outside insulation back
several inches and individual wires about 3/8” (9.5 mm)
to connect the cable at the Microboard. Do not connect
the shield at the printer-end of the cable.
Obtaining a Printout
A printout is obtained by pressing the “PRINT” key on
the keypad and then pressing either the “OPER DATA”
key or “HISTORY” key.

LD03843

FIG. 10 – PRINTER TO MICROBOARD ELECTRICAL CONNECTIONS
104

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FORM 150.62-NM1

TROUBLESHOOTING
TABLE 50 – TROUBLESHOOTING
PROBLEM

No display on panel.
Unit will not operate.

CAUSE

1. No 115VAC to 1T.

SOLUTION

1a. Check wiring and fuse
3FU
b. Check wiring emergency
stop contacts 5 to L of CTB2
Terminal Block.
c. Replace 1T

2. No 24VAC to Microboard

2. Check wiring 1T to
Microboard.

3. 1T defective, no
24VAC output.

3. Replace 1T

4. Short in wire to temp. sensors
or pressure transducers.

4. Unplug connections at
Microboard to isolate.

5. Defective Microboard
or Display board.

5. Replace Microboard.

NOTE: Contact YORK
Service before
Replacing circuit Boards!

“FLOW SWITCH/REM
STOP NO RUN PERMISSIVE”

“LOW SUCTION PRESSURE”
FAULT

1. No chilled liquid flow.

1. Check chilled liquid flow.

2. Flow switch improperly
installed.

2. Check that the flow switch
is installed according to
manufacturer’s
instructions.

3. Defective flow switch.

3. Replace flow switch.

4. Remote cycling device open.

4. Check cycling devices
connected to terminals
13 & 14 of the CTB1
Terminal Block.

1. Improper suction pressure
cut-outs adjustments.

1. Adjust per recommended
settings.

2. Low refrigerant charge.

2. Repair leak if necessary
and add refrigerant.

3. Fouled filter dryer.

3. Change dryer/core.

CONT’D

YORK INTERNATIONAL

105

3

Service and Troubleshooting

PROBLEM
“LOW SUCTION PRESSURE”
FAULT (CONT’D)

“HIGH DISCHARGE
PRESSURE” FAULT

“LOW LIQUID TEMP”
FAULT

CAUSE

SOL

4. TXV defective.

4. Replace TXV.

5. Reduced flow of chilled
liquid through the cooler.

5. Check GPM (See “Limitations”
in Installation section). Check
operation of pump, clean
pump strainer, purge chilled
liquid system of air.

6. Defective suction pressure
transducer/low pressure
switch or wiring

6. Replace transducer/low
pressure switch or faulty
wiring. Refer to “Service”
section for pressure/voltage
formula.

7. LLSV defective

7. Replace LLSV

1. Condenser fans not operating
or operating backwards.

1. Check fan motor, fuses,
and contactors. Assure fan
blows air upward.

2. Too much refrigerant.

2. Remove refrigerant.

3. Air in refrigerant system.

3. Evacuate and recharge
system.

4. Defective discharge
pressure transducer.

4. Replace discharge pressure
transducer. Refer to Service
section for pressure/voltage
formula.

1. Improperly adjusted leaving
chilled liquid temp cut-out
(glycol only).

1. Re-program the leaving
chilled liquid temp. cut-out.

2. Micropanel setpoint/range
values improperly programmed.

2. Re-adjust setpoint/range.

3. Chilled liquid flow too low.

3. Increase chilled liquid flow –
refer to Limitations in Installation section.

4. Defective LWT or RWT sensor.
(assure the sensor is properly
installed in the bottom of the well
with a generous amount of heat
conductive compound)

4. Compare sensor against a
known good temperature
sensing device. Refer to
Service section for temp/
voltage table.

CONT’D

106

YORK INTERNATIONAL

FORM 150.62-NM1

PROBLEM

“MP / HPCO” FAULT

COMPRESSOR(S) WON’T
START

LACK OF COOLING EFFECT

YORK INTERNATIONAL

CAUSE

SOLUTION

1. Compressor internal motor
protector (MP) open.

1. Verify refrigerant charge is
not low. Verify superheat
setting of °10 - 15°F (5.6° 8.3°C). Verify correct compressor rotation. Verify
compressor is not over
loaded.

2. External overload tripped.

2. Determine cause and reset.

3. HPCO switch open

3. See “High Press. Disch.”
Fault

4. Defective HPCO switch

4. Replace HPCO switch

5. Defective CR relay

5. Replace relay

1. Demand not great enough.

1. No problem. Consult
“Installation” Manual to aid
in understanding compressor operation and capacity
control.

3

2. Defective water temperature
sensor.

2. Compare the display with a
thermometer. Should be
within +/- 2 degrees. Refer
to Service section for RWT/
LWT temp./voltage table.

3. Contactor/Overload failure

3. Replace defective part.

4. Compressor failure

4. Diagnose cause of failure
and replace.

1. Fouled evaporator surface.
Low suction pressure will
be observed.

1. Contact the local YORK
service representative.

2. Improper flow through the
evaporator.

2. Reduce flow to within chiller
design specs. See Limitations in Installation section.

3. Low refrigerant charge.
Low suction pressure will
be observed.

3. Check subcooling and add
charge as needed.

107

Service and Troubleshooting

MAINTENANCE
It is the responsibility of the equipment owner to provide maintenance on the system.

CONDENSER COILS

IMPORTANT

Dirt should not be allowed to accumulate on the condenser coil surfaces. Cleaning should be as often as
necessary to keep coil clean.

If system failure occurs due to improper maintenance
during the warranty period, YORK will not be liable for
costs incurred to return the system to satisfactory operation. The following is intended only as a guide and
covers only the chiller unit components. It does not cover
other related system components which may or may
not be furnished by YORK. System components should
be maintained according to the individual manufacture’s
recommendations as their operation will affect the operation of the chiller.
COMPRESSORS
Oil Level check:
The oil level can only be tested when the compressor is
running in stabilized conditions, to ensure that there is
no liquid refrigerant in the lower shell of the compressor. When the compressor is running at stabilized conditions, the oil level must be between 1/4 and 3/4 in
the oil sight glass. Note: at shutdown, the oil level can
fall to the bottom limit of the oil sight glass. Use YORK
“F” oil when adding oil.
Oil Analysis:
The oil used in these compressors is pale yellow in color
(mineral oil). If the oil color darkens or exhibits a change
in color, this may be an indication of contaminants in
the refrigerant system. If this occurs, an oil sample
should be taken and analyzed. If contaminants are
present, the system must be cleaned to prevent compressor failure.

Never use the scroll compressor to
pump the refrigerant system down into
a vacuum. Doing so will cause internal arcing of the compressor motor
which will result in failure of compressor.

CONDENSER FAN MOTORS

Exercise care when cleaning the coil
so that the coil fins are not damaged.

OPERATING PARAMETERS
Regular checks of the system should be preformed to
ensure that operating temperatures and pressures are
within limitations, and that the operating controls are
set within proper limits. Refer to the Operation, StartUp, and Installation sections of this manual.
ON-BOARD BATTERY BACK-UP
U17 is the Real Time Clock chip that maintains the date/
time and stores customer programmed setpoints. Anytime the chiller is to be off (no power to the microboard)
for an extended time (weeks/months), the clock should
be turned off to conserve power of the on-board battery. To accomplish this, the J11 jumper on the microboard must be moved to the “CLKOFF” position while
power is still supplied to the microboard.

THE UNIT EVAPORATOR HEATER
IS 120 VAC. DISCONNECTING
120VAC POWER FROM THE UNIT,
AT OR BELOW FREEZING TEMPERATURES, CAN RESULT IN
DAMAGE TO THE EVAPORATOR
AND UNIT AS A RESULT OF THE
CHILLED LIQUID FREEZING.
OVERALL UNIT INSPECTION
In addition to the checks listed on this page, periodic
overall inspections of the unit should be accomplished
to ensure proper equipment operation. Items such as
loose hardware, component operation, refrigerant leaks,
unusual noises, etc. should be investigated and corrected immediately.

Condenser fan motors are permanently lubricated and
require no maintenance.
108

YORK INTERNATIONAL

FORM 150.62-NM1

ISN CONTROL
RECEIVED DATA (CONTROL DATA)
The Middle Market receives 8 data values from the ISN.
The first 4 are analog values and the last 4 are digital
values. These 8 data values are used as control parameters when in REMOTE mode. When the unit is in
LOCAL mode, these 8 values are ignored. If the unit
receives no valid ISN transmission for 5 minutes it will
revert back to all local control values. Table 51 lists the
5 control parameters. These values are found under
feature 54 on the ISN.
TABLE 51 – ISN RECEIVED DATA
ISN PAGE
P03
P04
P05
P06
P07
P08
P09
P10

CONTROL DATA
SETPOINT
LOAD LIMIT STAGE (0,1, 2)
COOLING RANGE (DAT MODE ONLY)
—
START/STOP COMMAND
—
—
HISTORY BUFFER REQUEST

TRANSMITTED DATA
After receiving a valid transmission from the ISN, the
unit will transmit either operational data or history buffer
data depending on the “History Buffer Request” in page
10. Data must be transmitted for every ISN page under
feature 54. If there is no value to be sent to a particular
page, a zero will be sent. Tables 52 - 53 show the data
values and page listings for this unit.

YORK INTERNATIONAL

TABLE 52 – ISN TRANSMITTED DATA
ISN PAGE
P11
P12
P13
P14
P15
P16
P17
P18
P20
P21
P22
P23
P24
P25
P27
P28
P29
P33
P35
P36
P37
P38
P39
P40
P41

TYPE
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
ANALOG
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL
DIGITAL

DATA
LEAVING CHILLED LIQUID TEMP.
RETURN CHILLED LIQUID TEMP.
MIXED CHILLED LIQUID TEMP.
DISCHARGE AIR TEMP.
—
AMBIENT AIR TEMP.
—
SYS 1 RUN TIME (SECONDS)
SYS 1 DISCHARGE PRESSURE
—
—
—
SYS 1 ANTI-RECYCLE TIMER
ANTI-COINCIDENT TIMER
SYS 2 RUN TIME (SECONDS)
SYS 2 SUCTION PRESSURE
SYS 2 DISCHARGE PRESSURE
SYS 2 ANTI-RECYCLE TIMER
NUMBER OF COMPRESSORS
SYS 1 ALARM
SYS 2 ALARM
EVAPORATOR HEATER STATUS
EVAPORATOR PUMP STATUS
—
—

109

3

Service and Troubleshooting

TABLE 53 – ISN TRANSMITTED DATA
ISN PAGE

*

TYPE

P42

DIGITAL

P43
P44
P45

DIGITAL
DIGITAL
DIGITAL

P46

DIGITAL

P47
P48
P49

DIGITAL
DIGITAL
DIGITAL

P50

DIGITAL

P51

DIGITAL

P52

DIGITAL

P53

DIGITAL

P54

DIGITAL

P55
P56
P57
P58
P59
P60

DIGITAL
CODED
CODED
CODED
CODED
CODED

DATA
SYS 1 LIQUID LINE SOLENOID
VALVE
SYS HOT GAS BYPASS VALVE
—
—
SYS 2 LIQUID LINE SOLENOID
VALVE
LEAD SYSTEM (0=SYS 1, 1 SYS 2)
—
—
CHILLED LIQUID TYPE
(0=WATER, 1=GLYCOL)
AMBIENT CONTROL MODE
(0=STD, 1 = AMB)
LOCAL / REMOTE CONTROL
MODE (0=LOCAL, 1=REMOTE)
UNITS (0=IMPERIAL, 1=SI)
LEAD/LAG CONTROL MODE
(0=MANUAL, 1=AUTO)
—
*SYS 1 OPERATIONAL CODE
*SYS 1 FAULT CODE
*SYS 2 OPERATIONAL CODE
*SYS 2 FAULT CODE
SYS 1 COMP RUNNING

ISN PAGE
P61
P62
P63
P64

TYPE
CODED
CODED
CODED
CODED

P65

ANALOG

P66

ANALOG

P67

ANALOG

P68
P69
P70

ANALOG
ANALOG
ANALOG

P71

ANALOG

P72
P73

ANALOG
ANALOG

P74

ANALOG

P75-P84

—

DATA
SYS 1 COND FANS RUNNING
SYS 2 COMP RUNNING
SYS 2 COND FANS RUNNING
—
UNIT CONTROL MODE
0=LEAVING WATER,
1=RETURN WATER
2=DISCHARGE AIR,
3= SUCTION PRESSURE
ANTI-RECYCLE TIME
(PROGRAMMED)
LEAVING CHILLED LIQUID
TEMP CUTOUT
LOW AMBIENT TEMP CUTOUT
—
LOW SUCTION PRESS CUTOUT
HIGH DISCHARGE PRESS
CUTOUT
SETPOINT
COOLING RANGE
SETPOINT 2
(SP CONTROL)
NO DATA
ALL ZEROS

The operational and fault codes sent to pages 56 through 59 are defined in Table 54. Note that this table of fault and op codes is for all
DX products. The codes that are grayed out are not used on this unit.

110

YORK INTERNATIONAL

FORM 150.62-NM1

TABLE 54 – ISN OPERATIONAL AND FAULT CODES
P56/58
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

OPERATIONAL CODE
NO ABNORMAL CONDITION
UNIT SWITCH OFF
SYSTEM SWITCH OFF
LOCK-OUT
UNIT FAULT
SYSTEM FAULT
REMOTE SHUTDOWN
DAILY SCHEDULE SHUTDOWN
NO RUN PERMISSIVE
NO COOL LOAD
ANTI-COINCIDENCE TIMER ACTIVE
ANTI-RECYCLE TIMER ACTIVE
MANUAL OVERRIDE
SUCTION LIMITING
DISCHARGE LIMITING
CURRENT LIMITING
LOAD LIMITING
COMPRESSOR(S) RUNNING

P57/59
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

20

20

21

21

22
23

22
23

YORK INTERNATIONAL

FAULT CODE
NO FAULT
VAC UNDERVOLTAGE
LOW AMBIENT TEMPERATURE
HIGH AMBIENT TEMPERATURE
LOW LEAVING CHILLED LIQUID TEMP
HIGH DISCHARGE PRESSURE
HIGH DIFFERENTIAL OIL PRESSURE
LOW SUCTION PRESSURE
HIGH MOTOR CURRENT
LLSV NOT ON
LOW BATTERY WARNING
HIGH OIL TEMPERATURE
HIGH DISCHARGE TEMPERATE
IMPROPER PHASE ROTATION
LOW MOTOR CURRENT /MP / HPCO
MOTOR CURRENT UNBALANCED
LOW DIFFERENTIAL OIL PRESSURE
GROUND FAULT
MP /HPCO
LOW EVAPORATOR TEMPERATURE
INCORRECT REFRIGERANT
PROGRAMMED
POWER FAILURE, MANUAL RESET
REQUIRED
I/O BOARD FAILURE
OIL TEMP INHIBIT (LOW OIL TEMP)

111

3

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0014SC – YCAL0030SC

FIG. 11 – ELEMENTARY DIAGRAM
112

YORK INTERNATIONAL

FORM 150.62-NM1

20

LD03531

ELEMENTARY DIAGRAM
YCAL0014SC – YCAL0030SC

4

FIG. 11 – ELEMENTARY DIAGRAM (Cont’d)
YORK INTERNATIONAL

113

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0014SC – YCAL0030SC

LD03532

FIG. 12 – ELEMENTARY DIAGRAM
114

YORK INTERNATIONAL

FORM 150.62-NM1

This page intentionally left blank.

4

YORK INTERNATIONAL

115

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0034SC

FIG. 13 – ELEMENTARY DIAGRAM
116

YORK INTERNATIONAL

FORM 150.62-NM1

LD03533

ELEMENTARY DIAGRAM
YCAL0034SC

4

FIG. 13 – ELEMENTARY DIAGRAM (Cont’d)
YORK INTERNATIONAL

117

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0034SC

LD03534

FIG. 14 – ELEMENTARY DIAGRAM
118

YORK INTERNATIONAL

FORM 150.62-NM1

This page intentionally left blank.

4

YORK INTERNATIONAL

119

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0040SC – YCAL0060SC

FIG. 15 – ELEMENTARY DIAGRAM
120

YORK INTERNATIONAL

FORM 150.62-NM1

LD03535

ELEMENTARY DIAGRAM
YCAL0040SC – YCAL0060SC

4

FIG. 15 – ELEMENTARY DIAGRAM (Cont’d)
YORK INTERNATIONAL

121

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0040SC – YCAL0060SC

FIG. 16 – ELEMENTARY DIAGRAM
122

YORK INTERNATIONAL

FORM 150.62-NM1

LD03536

ELEMENTARY DIAGRAM
YCAL0040SC – YCAL0060SC

4

FIG. 16 – ELEMENTARY DIAGRAM (Cont’d)
YORK INTERNATIONAL

123

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0064SC – YCAL0080SC

FIG. 17 – ELEMENTARY DIAGRAM
124

YORK INTERNATIONAL

FORM 150.62-NM1

LD03537

ELEMENTARY DIAGRAM
YCAL0064SC – YCAL0080SC

4

FIG. 17 – ELEMENTARY DIAGRAM (Cont’d)
YORK INTERNATIONAL

125

Wiring Diagrams

ELEMENTARY DIAGRAM
YCAL0064SC – YCAL0080SC

FIG. 18 – ELEMENTARY DIAGRAM
126

YORK INTERNATIONAL

FORM 150.62-NM1

LD03538

ELEMENTARY DIAGRAM
YCAL0064SC – YCAL0080SC

4

FIG. 18 – ELEMENTARY DIAGRAM (Cont’d)
YORK INTERNATIONAL

127

Appendix 1 – Isolators

APPENDIX 1
(ALUMINUM FINS)
1" DEFLECTION – WEIGHT DISTRIBUTION POINT SPRING LOCATION
MODEL #
YCAL0014
YCAL0020
YCAL0024
YCAL0030
YCAL0034
YCAL0040
YCAL0044
YCAL0050
YCAL0060
YCAL0064
YCAL0070
YCAL0074
YCAL0080

A
CP-1-27
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-28
CP-2-31
CP-2-31

B
CP-1-27
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-28
CP-2-28
CP-2-28

C
CP-1-27
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-28
CP-2-31
CP-2-31

D
CP-1-27
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-28
CP-2-28
CP2-28

Refer to Dimensions for Weight Distribution Point Location A – D

SEISMIC WEIGHT DISTRIBUTION POINT SPRING LOCATION
MODEL #
YCAL0014
YCAL0020
YCAL0024
YCAL0030
YCAL0034
YCAL0040
YCAL0044
YCAL0050
YCAL0060
YCAL0064
YCAL0070
YCAL0074
YCAL0080

A
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-98
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1625
AEQM-1625
AEQM-1625

B
AEQM-97
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-1300
AEQM-1300
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1625

C
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-98
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1625
AEQM-1625
AEQM-1625

D
AEQM-97
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-1300
AEQM-1300
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1625

Refer to Dimensions for Weight Distribution Point Location A – D

ISOLATOR SPRING IDENTIFICATION TABLE
MODEL
CP-1-27
CP-1-28
CP-1-31
CP-1-27
CP-2-28
CP-2-31

128

1" DEFLECTION
PART- #
308439-27
308439-28
308439-31
308692-27
308692-28
308692-31

COLOR
ORANGE
GREEN
GRAY
ORANGE
GREEN
GRAY

MODEL
AEQM-97
AEQM-98
AEQM-1300
AEQM-1600
AEQM-1625

SEISMIC
PART #
301055-97
301055-98
301060-1300
301060-1600
301060-1625

COLOR
WHITE
GRAY
YELLOW
GRAY
RED

YORK INTERNATIONAL

FORM 150.62-NM1

APPENDIX 1
(COPPER FINS)
1" DEFLECTION – WEIGHT DISTRIBUTION POINT SPRING LOCATION
MODEL #
YCAL0014
YCAL0020
YCAL0024
YCAL0030
YCAL0034
YCAL0040
YCAL0044
YCAL0050
YCAL0060
YCAL0064
YCAL0070
YCAL0074
YCAL0080

A
CP-1-27
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-31
CP-2-31
CP-2-31
CP-2-31

B
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-28
CP-2-28
CP-2-31
CP-2-31

C
CP-1-27
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-31
CP-2-31
CP-2-31
CP-2-31

D
CP-1-27
CP-1-27
CP-1-27
CP-1-28
CP-1-28
CP-2-27
CP-2-27
CP-2-27
CP-2-28
CP-2-28
CP-2-28
CP-2-31
CP-2-31

Refer to Dimensions for Weight Distribution Point Location A – D

SEISMIC WEIGHT DISTRIBUTION POINT SPRING LOCATION
MODEL #
YCAL0014
YCAL0020
YCAL0024
YCAL0030
YCAL0034
YCAL0040
YCAL0044
YCAL0050
YCAL0060
YCAL0064
YCAL0070
YCAL0074
YCAL0080

A
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-98
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1628
AEQM-1628
AEQM-1628
AEQM-1628

B
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-98
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1625
AEQM-1625
AEQM-1628
AEQM-1628

C
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-98
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1628
AEQM-1628
AEQM-1628
AEQM-1628

D
AEQM-97
AEQM-97
AEQM-97
AEQM-98
AEQM-98
AEQM-1600
AEQM-1600
AEQM-1600
AEQM-1625
AEQM-1625
AEQM-1625
AEQM-1628
AEQM-1628

5

Refer to Dimensions for Weight Distribution Point Location A – D

ISOLATOR SPRING IDENTIFICATION TABLE
MODEL
CP-1-27
CP-1-28
CP-2-27
CP-2-28
CP-2-31

YORK INTERNATIONAL

1" DEFLECTION
PART- #
308439-27
308439-28
308692-27
308692-28
308692-31

COLOR
ORANGE
GREEN
ORANGE
GREEN
GRAY

MODEL
AEQM-97
AEQM-98
AEQM-1600
AEQM-1625
AEQM-1628

SEISMIC
PART #
301055-97
301055-98
301060-1625
301060-1625
301060-1628

COLOR
WHITE
GRAY
GRAY
RED
GRAY/GREEN

129

Appendix 1 – Isolators

APPENDIX 1
(DIMENSIONS)

LD03839

FIG. 19 – TYPE CP 1

LD03840

FIG. 20 – TYPE CP 2

APPENDIX 1
(DIMENSIONS)

MODEL #
AEQM-97
AEQM-98
AEQM-99
AEQM-1000
AEQM-1300
AEQM-1600
AEQM-1625
AEQM-1628

A
7
7
7
8-½
8-½
8-½
8-½
8-½

B
5-½
5-½
5-½
6-½
6-½
6-½
6-½
6-½

C
4-½
4-½
4-½
6
6
6
6
6

D
2-½
2-½
2-½
4-½
4-½
4-½
4-½
4-½

E
A
A
A
¾
¾
¾
¾
¾

F
!
!
!
@
@
@
@
@

G
7-!
7-!
7-!
8-@
8-@
8-@
8-@
8-@

H
A
A
A
B
B
B
B
B

J
@
@
@
½
½
½
½
½

5

LD04045

FIG. 21 – R SPRING SEISMIC ISOLATORS

Appendix 1 – Isolators

APPENDIX 1
INSTALLATION AND ADJUSTING INSTALLATIONS
TYPE CP MOUNTING
Mountings are shipped completely assembled, ready
to install.
1. Locate mountings under equipment at positions
shown on tags or on VM layout drawings, or as indicated on packing slip or correspondence.
2. Set mountings on subbase, shimming or grouting
where required to provide flat and level surface at
the same elevation for all mountings (1/4" maximum
difference in elevation can be tolerated). Support the
full underside of the base plate - do not straddle gaps
or small shims.
3. Unless specified, mountings need not be fastened
to floor in any way. If required, bolt mountings to floor
through slots.

of the mount to go down, possibly resting on the lower
housing.
5. If clearance “X” is less than 1/4" on any mounting,
with wrench turn up one complete turn on the adjusting bolt of each mounting. Repeat this procedure until
1/4”, clearance at “X” is obtained on one or more
mountings.
6. Take additional turns on all mountings having less
than 1/4” clearance, until all mountings have at least
this clearance.
7. Level the machine by taking additional turns on all
mounts at the low side. Clearance should not exceed 1/2" - greater clearance indicates that mountings were not all installed at the same elevation, and
shims are required. This completes adjustment.

4. Set the machine or base on the mountings. The
weight of the machine will cause the upper housing

LD03837

FIG. 22 – TYPE CP MOUNTING

132

YORK INTERNATIONAL

FORM 150.62-NM1

APPENDIX 1
“AEQM” SPRING-FLEX MOUNTING
INSTALLATION AND ADJUSTMENT INSTRUCTIONS
1. Isolators are shipped fully assembled and are to be
spaced and located in accordance with installation
drawings or as otherwise recommended.

5. Remove cap screw “C” and save. Gently place machine or machine base on top of bolt “B”. Install cap
screw “C” but DO NOT tighten.

1a. Locate spring port facing outward from equipment or base so that spring is visible.

6. The weight of the machine will cause the spring and
thus bolt “B” to descend.

2. To facilitate installation, prior to installing, VMC recommends turning adjusting bolt “B” so that the “Operating Clearance” marked “*” is approximately 1"
to 1-1/2" for 1" deflection units, 1-1/2" to 2" for 1-1/2"
deflection units, and 2" to 2-1/2" for 2" deflection units.

7. Adjust all isolators by turning bolt “B” so that the operating clearance “*” is approximately 1/4". NOTE:
It may be necessary to adjust rebound plate “D” for
clearance.

3. Locate isolators on floor or subbase as required, ensuring that the isolator centerline matches the equipment or equipment base mounting holes. Shim and/
or grout as required to level all isolator base plates
“A”. A 1/4" maximum difference in elevation can be
tolerated.

6. Check equipment level and fine adjust isolators to
level equipment.
9. Adjust rebound plate “D” so that the operating clearance “**” is no more than 1/4".
10. Tighten cap screw “C”. Adjustment is complete.

4. Anchor all isolators to floor or subbase as required.
For installing on concrete VMC recommends HILTI
type HSL heavy duty anchors or equal.

5

LD03838

FIG. 23 – “AEQM” SPRING-FLEX MOUNTING

YORK INTERNATIONAL

133

ALABAMA
Birmingham
YORK International Corp.
(205) 987-0458

LOUISIANA
New Orleans
YORK International Corp.
(504) 464-6941

ARIZONA
Phoenix
YORK International Corp.
(602) 220-9400

MARYLAND
Baltimore/Washington
YORK International Corp.
(410) 720-6383

CALIFORNIA
Los Angeles
YORK International Corp.
(714) 897-0997
San Francisco
YORK International Corp.
(510) 426-1166

MASSACHUSETTS
Boston
YORK International Corp.
(781) 769-7950

COLORADO
Denver
YORK International Corp.
(303) 649-1500
CONNECTICUT
Danbury
YORK International Corp.
(203) 730-8100
FLORIDA
Miami
YORK International Corp.
(305) 389-9675
Tampa
YORK International Corp.
(381) 621-1323
Orlando
YORK International Corp.
(407) 444-2261
GEORGIA
Atlanta
YORK International Corp.
(404) 925-0346
HAWAII
Honolulu
YORK International Corp.
(808) 596-0761
ILLINOIS
Chicago
YORK International Corp.
(708) 520-1910
INDIANA
Indianapolis
YORK International Corp.
(317) 595-3050
KENTUCKY
Louisville
YORK International Corp.
(502) 499-6020

CANADA

Ottawa, Ontario
(613) 596-9111

MICHIGAN
Detroit
YORK International Corp.
(810) 689-7277
MINNESOTA
Minneapolis
YORK International Corp.
(612) 780-4446
MISSOURI
Kansas City
YORK International Corp.
(816) 221-9675
St. Louis
YORK International Corp.
(314) 770-0909
NEW JERSEY
Newark
YORK International Corp.
(908) 225-0606
NEVADA
Las Vegas
YORK International Corp.
(702) 873-2200
NEW YORK
Buffalo
YORK International Corp.
(716) 633-2172
New York
YORK International Corp.
(212) 843-1602
NORTH CAROLINA
Charlotte
YORK International Corp.
(704) 598-0000
Greensboro
YORK International Corp.
(336) 299-9675
Raleigh
YORK International Corp.
(919) 829-1700

Toronto, Ontario
(905) 890-6812

Laval, Quebec
(514) 387-6000

OHIO
Cincinnati
YORK International Corp.
(513) 489-8871
Cleveland
YORK International Corp.
(216) 447-0696
Columbus
YORK International Corp.
(614) 841-5242
PENNSYLVANIA
Philadelphia
YORK International Corp.
(610) 640-2320
Pittsburgh
YORK International Corp.
(412) 364-6600
York (HQ)
YORK International Corp.
(717) 771-6561
SOUTH CAROLINA
Greenville
YORK International Corp.
(803) 297-4822
TENNESSEE
Kingsport
YORK International Corp.
(615) 349-2450
Nashville
YORK International Corp.
(615) 833-9675
TEXAS
Austin
YORK International Corp.
(512) 458-4575
Dallas
YORK International Corp.
(214) 241-1219
Houston
YORK International Corp.
(713) 782-5200
San Antonio
YORK International Corp.
(210) 496-6631
UTAH
Salt Lake City
YORK International Corp.
(801) 261-1200
VIRGINIA
Richmond
YORK International Corp.
(804) 359-2600
Newport News
YORK International Corp.
(804) 873-0362
WASHINGTON
Seattle
YORK International Corp.
(206) 251-9145

YORK Applied Systems field office listing subject to change.
See us on the web at http://www.york.com for additional information.

134

YORK INTERNATIONAL

FORM 150.62-NM1

This page intentionally left blank.

YORK INTERNATIONAL

135

P.O. Box 1592, York, Pennsylvania USA 17405-1592
Copyright © by York International Corporation 2000
Form 150.62-NM1 (700)
Supersedes: 150.62-NM1 (899)
150.62-NM1 (399)

Tele. 800-851-1001
www.york.com

Subject to change without notice. Printed in USA
ALL RIGHTS RESERVED



---

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Producer                        : Acrobat Distiller 4.0 for Windows
Keywords                        : Form 150.62-NM1 (700), Millennium Air-Cooled Liquid Chillers Hermetic Scroll, Installation, Operation, Maintenance
Create Date                     : 2000:06:15 13:33:40Z
Modify Date                     : 2003:06:30 13:57:05-04:00
Metadata Date                   : 2003:06:30 13:57:05-04:00
Document ID                     : uuid:e775b8c7-2303-4bfc-b7f5-ce6320b7b28c
Format                          : application/pdf
Title                           : Form 150.62-NM1 (700), Millennium Air-Cooled Liquid Chillers Hermetic Scroll, Installation, Operation, Maintenance
Description                     : Form 150.62-NM1 (700), Millennium Air-Cooled Liquid Chillers Hermetic Scroll, Installation, Operation, Maintenance
Creator                         : York International Corporation
Author                          : York International Corporation
Subject                         : Form 150.62-NM1 (700), Millennium Air-Cooled Liquid Chillers Hermetic Scroll, Installation, Operation, Maintenance

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