York MILLENNIUM YT J Quick start guide

JOB DATA:
CHILLERMODELNO.YT _______________ CHILLERMODELNO.YT _____________________
NO.OFUNITS ________________________ NO.OFUNITS ______________________________
TYPEOFSTARTING ___________________ TYPEOFSTARTING _________________________
Included byYORK for Field Installation (by others) are: YES NO PER UNIT
One –Two Unit Sequence Control Kit, Part No.466-61597T '' _____
CondenserWater Flow Switch '' _____
________________________________________________________ '' _____
________________________________________________________ '' _____
PRODUCT DRAWING
YORK INTERNATIONAL CORPORATION
P.O. Box 1592, York, PA 17405
CONTRACTOR _______________________ PURCHASER ____________________________________________
ORDER NO. __________________________ JOB NAME_______________________________________________
YORK CONTRACT NO. _________________ LOCATION _______________________________________________
YORK ORDER NO. ____________________ ENGINEER ______________________________________________
REFERENCE DATE ________ APPROVAL DATE ________ CONSTRUCTION DATE ________
Supersedes: Nothing Form 160.55-PW7 (899)
WIRING DIAGRAM
FIELD CONTROL MODIFICATIONS
MILLENNIUM ™ MODEL YT CHILLERS (STYLE J)
Millennium chiller design allows for ease of interfac-
ing with Energy Management Systems (EMS). The
Graphic Control Center includes unit status contacts,
provisions for remote control inputs and provisions for
remote setpoint reset of leaving chilled liquid tempera-
ture and current limit for EMS interfacing. See Note 7.
Five sets of unit status contacts are factory furnished
througha field wiringterminal board inthe Graphic Con-
trol Center. Each set of contacts are single pole, nor-
mally open, rated at 5 amperes resistive at 240VAC.
Chiller status contacts are provided for unit:
• Remote Mode Ready to Start – See Fig. 1.
• Cycling Shutdown – See Fig. 2.
• Safety Shutdown – See Fig. 3.
• Run (System Operating) – See Fig. 4.
• Anticipatory/Alarm – See Fig. 5.
Four sets of inputs are available to the EMS, allowing
for remote control of unit operation. Input device con-
tactratingshall be 5 milliamperes at 115VAC. Field wir-
ing terminal board (TB4) in the Graphic Control Center
permits connection for the following operation:
• Remote Stop Contacts – See Fig. 6.
• Remote Start Contacts – See Fig. 6.
• Remote/Local Cycling Devices – See Fig. 7.
• Multi-unit sequence – See Fig. 8.
The chiller should not be cycled by the Energy Manage-
ment System because the large motor used to drive the
centrifugalcompressor is limited to one start per 30min-
utes. Instead, it is possible to limit the compressor motor
amp draw indirectly or directly by the following meth-
ods:
1. Application of Sequence Control Kit, so only one
unit is running, when a single unit can carry the
cooling load – See Fig. 10.
2. When multiple unit installations are controlled by
an EMS, remote start and stop contacts are avail-
able to start and stop each chiller per Fig. 6. Con-
tact rating shall be 5 milliamperes at 115 volts A.C.
ENERGY MANAGEMENT SYSTEMS

YORK INTERNATIONAL
2
3. The Graphic Control Center has a programmable
time clock function as a standard feature with holi-
day capability. This offers one preset automatic
Start-Stop per day on a seven day calendar basis
with the ability to program a single additional holi-
day start and stop time up to a week in advance.
Chilled water pump control contacts (see Note 13)
are also provided, allowing for efficient automatic
operation of the chilled water pump to reduce en-
ergy. Two chilled water pump operating modes are
available via the CHW PUMP programming dip
switch (position 8 of SW1) on the Micro Board.
With the switch in the OFF position, the chilled
water pump operates for 30 seconds prior to chiller
start, during chiller operation, coastdown, and
LWT cycling shutdowns. With the switch in the
ON position, the chilled water pump operates as
above plus it operates during MULTI-UNIT and
REMOTE/LOCAL cycling shutdowns.
4. Reduce the compressor-motor kW input (and thus
amps), by raising the leaving chilled liquid
temperature through remote temperature control
setpoint in the “remote” operating mode. When
remote temperature reset is accomplished by sup-
plying a 1 to 11 second pulse-width modulated sig-
nal, refer to Fig. 20. Through use of the remote
temperature control analog input on the Micro
Board, the leaving chilled liquid temperature may
be reset via a 0 to 20 or 4 to 20mA D.C. current
signal, a 0 to 10 or 2 to 10 volt D.C. signal.
5. Current limiting of demand during pulldown may
be accomplished by using the standard
PULLDOWN DEMAND LIMIT function pro-
vided in the Graphic Control Center. The
“PulldownDemand Limit” key can beprogrammed
to limit compressor motor current from 30 to 100
percent of full load amperes, for 1 to 255 minutes
following each compressor start. For more details
refer to Graphic Control Center Instructions, Form
160.55-O1.
6. Controlling the maximum allowable compressor
motor amps from 30 to 100% through remote cur-
rent limit setpoint. Refer to Fig. 17 when the re-
motecurrent limit is accomplished by supplying a 1
to 11 second pulse-width modulated signal in the
“remote” operating mode. A jumper configurable
analog input is available for remote current limit
setpoint via a 0 to 20 or 4 to 20mA D.C. current
signal, a 0 to 10 or 2 to 10 volt D.C. signal.
7. The YORK ISN System may be interfaced with
the chiller Graphic Control Center to provide uni-
fied chiller plant system control. The ISN System
directly communicates with the Graphic Control
Center via the ISN GPIC card which may be in-
stalledin the ControlCenter.All temperatures, pres-
sures,safety alarms and cycling information known
to the Graphic Control Center are then available to
the ISN System for integrated chiller plant control,
data logging, and local and remote operator dis-
plays. The ISN GPIC card also allows the ISN to
start, stop, and reset the chiller’s leaving chilled
water and current limit setpoints.
ENERGY MANAGEMENTS SYSTEMS (CONT’D)
External wiring, unless specified as
an optional connection in the
manufacturer’s product literature, is
not to be connected inside this cabi-
net. Furthermore, auxiliary devices
suchas relays,switches, transducersand controls
may not be installed inside this enclosure. All
wiring must be in accordance with YORK’s pub-
lished specifications and must be performed only
by qualified personnel. YORK will not be respon-
sible for damages resulting from improper con-
nection to these controls or application of im-
proper control signals. Failure to follow this
warning will void the manufacturer’s warranty
and may cause serious damage to property or in-
jury to persons.

FORM160.55-PW7
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YORK INTERNATIONAL
LIST OF FIGURES
Fig. 1 – Remote Mode Ready To Start Contacts ....................................................................................... 4
Fig. 2 – Cycling Shutdown Contacts ........................................................................................................... 4
Fig. 3 – Safety Shutdown Contacts............................................................................................................. 5
Fig. 4 – Run Contacts.................................................................................................................................. 5
Fig. 5 – Anticipatory/Alarm Contacts ......................................................................................................... 5
Fig. 6 – Remote Start-Stop Contacts From Energy Management System ................................................. 6
Fig. 7 – Remote/Local Cycling Devices ..................................................................................................... 6
Fig. 8 – Multi-unitSequence ....................................................................................................................... 7
Fig. 9 – Condenser Water Flow Interlock................................................................................................... 7
Fig. 10 – Two Unit Sequence Control........................................................................................................... 8
Fig. 11 – Multiple Units (Two) – Series Operation ..................................................................................... 8
Fig. 12 – Multiple Units (Two) – Parallel Operation – Individual Pumps .................................................... 9
Fig. 13 – Multiple Units (Two) – Parallel Operation – Single Chilled Water Pump ..................................... 9
Fig. 14 – Electro-mechanical Starter Manual Reset Overloads ................................................................... 9
(2300 To 4160 Volts U.l. Or C.S.A. Approved Units Only)
Fig. 15 – Remote Current Limit Setpoint With 0-10VDC 0r 2-10VDC Signal ............................................ 10
Fig. 16 – Remote Current Limit Setpoint With 0-20mA or 4-20mA Signal.................................................. 10
Fig. 17 – Remote Current Limit Setpoint With PWM Signal ........................................................................ 11
Fig. 18 – Remote Leaving Chilled Liquid Temp. Setpoint with 0-10VDC or 2-10VDC ............................. 12
Fig. 19 – Remote Leaving Chilled Liquid Temp. Setpoint with 0-20mA or 4-20mA Signal ......................... 12
Fig. 20 – Remote Leaving Chilled Liquid Temperature Setpoint with PWM Signal .................................... 13
Fig. 21 – Micro Board Dip Switch For Auto/Manual Restart After Power Failure .................................... 14
Fig. 22 – External Signal For Refrigeration Unit Failure .............................................................................. 14
Fig. 23 – Run Contacts/Remote Run Light And Shutdown Indicator Plus EMS ......................................... 15
Fig. 24 – Auxiliary Safety Shutdown Input ................................................................................................... 15
Fig. 25 – Evaporator Water Pump Interlock Or Flow Switch ...................................................................... 15

YORK INTERNATIONAL
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FIG. 1 – REMOTE MODE READY TO START
CONTACTS
LD04383
FIG. 2 – CYCLING SHUTDOWN CONTACTS
When closed, these contacts signify the unit is not per-
mitted to start due to a CYCLING shutdown condition.
The unit will automatically restart after the cycling con-
dition is no longer present. YORK Operating and Main-
tenance Manual 160.55-O1 provides a list and explana-
tion of all Cycling shutdowns. While these contacts are
closed,the Graphic Control Center willdisplay “Cycling
Shutdwon – Auto Restart” on the System Status Bar
and the cause of the shutdown on the System Details
bar of the display. Cycling Shutdwon contacts function
in all operating modes.
FIG. 2 – CYCLING SHUTDOWN CONTACTS
LD04384
FIG. 1 – REMOTE MODE READY TO START
CONTACTS
When closed, these contacts signify the following:
1. The Graphic Control Center is in “digital”, “ana-
log” or “ISN” remote operating mode, allowing
for energy management system or remote start/stop
control (Fig. 6);
2. All chiller safety cutout controls are in the normal
position, so they will allow the unit to start;
3. All chiller cycling cutout controls are in the nor-
mal position, so they will allow the unit to start;
4. The Graphic Control Center COMPRESSOR
switch is in the “RUN” (l) position;
5. The 30 minute anti-recycle timer has timed out. A
closure of the Remote Mode Ready to Start Con-
tacts then signifies that the unit shall start when
the Energy Management System maintains the Re-
mote Stop contact (Fig. 6) open and momentarily
closes the Remote Start Contact (Fig. 6). When the
Remote Mode Ready to Start Contacts close, the
Graphic Control Center will display the following
message: “SYSTEM READY TO START”.

FORM160.55-PW7
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YORK INTERNATIONAL
FIG. 3 – SAFETY SHUTDOWN CONTACTS
LD04385 LD04386
FIG. 4 – RUN CONTACTS
When closed, these contacts signify that the unit is op-
erating. The Graphic Control Center will display a Sys-
tem Run Message.
FIG. 4 – RUN CONTACTS
FIG. 3 – SAFETY SHUTDOWN CONTACTS
When closed, these contacts signify the unit is not per-
mitted to start due to a SAFETY shutdown condition.
Safety shutdowns require a manual reset procedure be
performed before the unit can be restarted. YORK
Operatingand Maintenance Manual 160.55-O1provides
a list and explanation of all Safety shutdowns. While
these contacts are closed, the Graphic Control Center
will display “Safety Shutdown – Manual Restart” on
the System Status Bar and the cause of the shutdown
on the System Details Bar of the display. These con-
tacts will remain closed until the safety condition no
longer exists and a manual reset is performed by plac-
ing the Graphic Control Center COMPRESSOR Switch
in the Stop-Reset position (O). The unit can then be
restarted. Safety Shutdown contacts function in all op-
erating modes. FIG. 5 – ANTICIPATORY/ALARMCONTACTS
These contacts will close whenever one or more of the
following WARNING conditions occurs. They will re-
main closed as long as the condition is in effect. On
most Warnings, the contacts automatically open when
the condition is no longer present. On those warnings
marked with an asterisk, the contacts will open only
after the condition is no longer present and the WARN-
ING RESET key is pressed in Operator (or higher) ac-
cess level.
Realtime Clock failure, Condenser or EvaporatorTrans-
ducer Error*, Purge – High Pressure*, Purge – Float
Switch Error*, Excess Purge*, Vanes Uncalibrated,
External I/O – Serial Communications, Setpoint Over-
ride*,Condenser-HighPressure Limit, Evaporator-Low
Pressure Limit, Vanes Uncalibrated – Fixed speed, Har-
monic filter – Operation Inhibited, Harmonic Filter –
Data Loss, Harmonic Filter – Input Frequency Out of
Range.
FIG. 5 – ANTICIPATORY/ALARMCONTACTS
LD04604

YORK INTERNATIONAL
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FIG. 6 – REMOTE START AND STOP CONTACTS
FROM ENERGY MANAGEMENT SYSTEM
When the Graphic Control Center is in the “Digital”,
“Analog” or “ISN” remote operating mode and the
COMPRESSOR switch is in the “RUN” (l) position,
with the Remote Stop Contacts open, and the Remote
Mode Ready to Start Contacts closed (Fig. 1), the unit
will start via a closure of the Remote Start Contacts. A
subsequent closure of the Energy Management System
Remote Stop Contacts causes the chiller to shut down.
The Graphic Control Center will display “REMOTE
STOP” because the Energy Management System Re-
moteStop Contacthas commanded theunit to shutdown.
It is recommended that maintained contacts be used for
both START and STOP.
Even when the chiller is applied with
Remote Start-Stop (when the Control
Center is in the “remote operating
mode),an EMERGENCYSTOP byan
operator or others can STOP the com-
pressorfrom theGraphicControl Cen-
terand preventthechiller fromrestart-
ing. However, the operator cannot lo-
callystart thecompressor using“com-
pressor” start switch, when the con-
trol center is in the “remote” operat-
ing mode.
FIG. 6 – REMOTESTART-STOPCONTACTSFROM
ENERGYMANAGEMENTSYSTEM FIG. 7 – REMOTE/LOCALCYCLINGDEVICES
FIG. 7 – REMOTE/LOCAL CYCLING DEVICES
The closure of an automatic reset device across this
input will permit the unit to operate in all operating
modes. Conversely, an opening of the device contacts
will inhibit the unit from operating; the Graphic Con-
trol Center will then display the following messages:
“CYCLING SHUTDOWN – AUTO RESTART” and
“SYSTEM CYCLING – CONTACTS OPEN”.
The Graphic Control Center contains
a seven day time clock to select daily
schedule Start/Stop times (Sunday
through Saturday including one or
more holidays in week) up to one full
week at a time. So automatic start and
stopof theunitonadaily basis,at pre-
determinedtimes, canbe programmed
as a standard feature; an additional
program timer is not required for this
function.
LD04387 LD04389

FORM160.55-PW7
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YORK INTERNATIONAL
FIG. 9 – CONDENSER WATER FLOW INTERLOCK
If desired, a condenser water flow interlock can be ap-
plied. Flow switch – McDonnel type FS8W, max. 150
psi (YORK Part No. 024-15793) available at additional
cost. If condenser water flow switch is not used, a
jumper must be installed between terminals 1 and 11 .
When condenser water is flowing, the flow switch con-
tact will close. Opening of the condenser water flow
switch contacts for 2 continuous seconds will cause unit
shutdown. The Flow Switch Status is checked 30 sec-
onds into “System Run” and continuously thereafter.
The Graphic Control Center will display the following
message: “CYCLING SHUTDOWN – AUTO RE-
START” and “CONDENSER FLOW SWITCH
OPEN”.
LD04390
FIG. 8 – MULTI-UNITSEQUENCE FIG. 9 – CONDENSERWATER FLOW INTERLOCK
LD04391
FIG. 8 – MULTI-UNIT SEQUENCE
For multiple chiller installation application, Multi-Unit
Sequence contacts are available to start and stop each
unit. The maintained closure of a device contacts across
terminals 1and 9will permit the unit to operate in
all the operating modes with the “compressor” switch
in the “RUN” (l) position. Conversely, an opening of
the device contacts will inhibit the unit from operating;
the Graphic Control Center will then display the fol-
lowing message: “CYCLING SHUTDOWN – AUTO
RESTART” and “MULTIUNIT CYCLING – CON-
TACTS OPEN”. An accessory sequence control kit
for two, three or four units is available from YORK –
See Fig. 10 for Two Unit Sequence Control kit.

YORK INTERNATIONAL
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FIG. 11 – MULTIPLE UNITS (TWO) –
SERIES OPERATION
The supply chilled water temperature to the building is
normally determined by the “chilled liquid temp.”
setpoint for Unit #2. When lead selector position of
LD04393
FIG. 11 – MULTIPLEUNITS (TWO) – SERIES OPERATION (NOTES8 & 11)
sequencecontrolkit (Fig.10) isUnit#1, thesupply chilled
water temperature to the building will be the tempera-
ture control setpoint on Unit #1 Graphic Control Center.
If lower temperature is desired, reprogram the “chilled
liquid temp.” setpoint for Unit #1.
LD04392
FIG.10 – TWOUNITSEQUENCECONTROL
FIG. 10 – TWO UNIT SEQUENCE CONTROL
Provides that cycling thermostat RWT will automati-
cally cycle either #1 or #2 unit. Timer 3TR is an addi-
tional feature which prevents simultaneous starting of
lead and lag unit following a power failure and elimi-
nates nuisance starting of lag unit due to periodic fluc-
tuations in temperature. For two unit sequence control
kit, order YORK Accessory Kit No. 466-61597T for
controls as specified with NEMA 1 enclosure.
RWT has 20°F to 80°F range with adjustable differen-
tial of 3-1/2 to 14°F; 6 ft. of capillary with 3/8" x 5"
bulb and 1/2" NPT brass well (maximum liquid DWP
300 PSIG). The thermostat is drawn to indicate its op-
eration closes on rise. A 1/2" pipe coupling in the re-
turn chilled water line from the building must be fur-
nished (by others) for RWT control well.

FORM160.55-PW7
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YORK INTERNATIONAL
LD04394
FIG. 12 – MULTIPLEUNITS(TWO)–PARALLEL
OPERATION–INDIVIDUAL UNITPUMPS
FIG. 12 – MULTIPLE UNITS (TWO) – PARALLEL
OPERATION – INDIVIDUAL UNIT PUMPS
This piping arrangement is the same as Fig. 13, except
that the chilled water pumps associated with each cooler
(evaporator) are cycled on and off with the unit. This
results in reduced chilled water flow rates whenever a
single unit can handle the cooling load. Because no
chilled water flows through the inoperative unit, the
mixedwater temperature peculiar to using asingle pump
is avoided. When one unit is cut-out by the sequence
control (Fig. 10) the temperature of the supply chilled
water does not change.
FIG. 13 – MULTIPLE UNITS (TWO) – PARALLEL OP-
ERATION–SINGLECHILLEDWATERPUMP
For this piping arrangement, each chiller’s water sensor
is located in its own leaving water nozzle. This produces
aconstant“mixed” chilled water temperature when both
units are operating. When either unit is cycled off by
the sequence control (Fig. 10), mixed chilled water
temperature will rise as a result of uncooled return wa-
ter flowing through the inoperative unit. For individual
unit chilled water pump piping, refer to Fig. 12.
FIG. 13 – MULTIPLEUNITS(TWO)–PARALLEL
OPERATION–SINGLECHILLEDWATER
PUMP
LD04395
FIG.14 – ELECTRO-MECHANICAL STARTER
MANUAL RESET OVERLOADS
Terminals are available for connection of the manual
reset overloads and/or safety devices in the high volt-
age electro-mechanical starter for U.L. or C.S.A. ap-
proved units having 2300 to 4160 volt motors. See Re-
moteMotor Starter (E-M) specifications, Product Draw-
ing Form 160.45-PA5.1. An opening of the contacts
causes the Graphic Control Center to display: “CY-
CLING SHUTDOWN – AUTO RESTART” and “MO-
TOR CONTROLLER – CONTACTS OPEN”. To re-
start the chiller, reset the external device in the
electro-mechanical starter that caused the shutdown.
Then the unit will automatically restart.
FIG. 14 –ELECTRO-MECHANICALSTARTER
MANUALRESET OVERLOADS (2300 to
4160 Volts U.L. or C.S.A. approved units
only)
LD04388

YORK INTERNATIONAL
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FIG. 15 – REMOTECURRENTLIMITSETPOINTWITH
0-10VDCOR 2-10VDC SIGNAL
REMOTE CURRENT LIMIT SETPOINT with 0-10VDC,
2-10 VDC, 0-20mA, 4-20mA or Pulse Width Modula-
tion Signal.
The Remote Current Limit setpoint can be reset over
the range of 100% to 30% Full Load Amps (FLA) by
supplying (by others) a 0-10VDC, 2-10VDC, 0-20mA,
4-20mA or 1 to 11 second Pulse Width Modulated
(PWM) signal to the Graphic Control Center. The
Graphic Control Center must be configured appropri-
ately to accept the desired signal type as follows:
• The appropriate Remote Mode must be selected:
Analog Remote Mode must be selected when us-
ing a voltage or current signal input. Digital Re-
mote Mode must be selected when using a PWM
input.
• If Analog Remote Mode is selected, the Remote
Analog Input Range setpoint must be set to “0-
10VDC” or “2-10VDC” as detailed below, regard-
less of whether the signal is a voltage or current
input signal type.
• Micro Board Program Jumper P23 must be posi-
tioned appropriately per the input signal type as de-
tailed below. It is recommended that a qualified
Service Technician position this jumper.
Important! The signal type used for
Remote Current Limit Setpoint reset
and the signal type used for Remote
Leaving Chilled Liquid Temperature
setpoint reset must be the same. For
example, if a 0-10VDC signal is be-
ing used for Remote Leaving Chilled
Liquid Temperature Reset , then a 0-
10VDC signal must be used for Re-
mote Current Limit Reset.
SIGNAL
COMMON 5
1
+
J22
LD04498
0-10VDC - As shown in Fig. 15, connect input to Mi-
cro Board J22-1 (signal) and J22-5 (Gnd). The setpoint
varies linearly from 100% to 30% FLA as the input
varies from 0-10VDC. This input will only be accepted
when Analog Remote Mode is selected, the “Remote
Analog Input Range” setpoint is set for 0-10 Volts,
and Micro Board Program Jumper JP23 has been re-
moved. Calculate the setpoint for various inputs as fol-
lows:
SETPOINT(%) = 100 –(VDCX 7)
For example, if the input is 5VDC, the setpoint would
be set to 65% as follows:
SETPOINT (%) = 100 –(5 X 7) = 100 –35 = 65%
2-10VDC - As shown in Fig. 15, connect input to Mi-
cro Board J22-1 (signal) and J22-5 (Gnd). The setpoint
varies linearly from 100% to 30% FLA as the input
varies from 2 to 10VDC. This input will only be ac-
cepted when “Analog” Remote Mode is selected, the
“Remote Analog Input Range” setpoint is set for
“2-10 Volts” and Micro Board Program Jumper JP23
has been removed. Calculate the setpoint for various
inputs as follows:
SETPOINT (%) = 100 –[(VDC –2) X 8.75]
For example, if the input is 5VDC, the setpoint would
be set to 74% as follows:
SETPOINT(%) = 100 –[(5-2) X 8.75]
= 100 –[3 X 8.75]
= 100 –26.25 = 74%
0-20 mA - As shown in Fig. 16, connect input to Micro
Board J22-2 (signal) and J2-5 (Gnd). The setpoint var-
ies linearly from 100% to 30% FLA as the input varies
from 0mA to 20mA. This input will only be accepted
when “Analog” Remote Mode is selected, the “Re-
SIGNAL
COMMON 5
2
+
J22
LD04499
FIG. 16 – REMOTECURRENTLIMITSETPOINTWITH
0-20mAOR4-20mASIGNAL

FORM160.55-PW7
11
YORK INTERNATIONAL
mote Analog Input Range” setpoint is set for 0-10
Volts, and Micro Board Program Jumper JP23 has been
placed on pins 1 and 2. Calculate the setpoint for vari-
ous inputs as follows:
SETPOINT(%) = 100 –(mAX3.5)
For example, if the input is 8mA, the setpoint would be
set to 72% as follows:
SETPOINT(%) = 100 –(8 X 3.5)
= 100 –28 = 72%
4-20mA - As shown in Figure 16, connect input to Mi-
cro Board J22-2 (signal) and J2-5 (Gnd). The setpoint
varies linearly from 100% to 30% FLA as the input
varies from 4mA to 20mA. This input will only be ac-
cepted when “Analog” Remote Mode is selected, the
“Remote Analog Input Range” setpoint is set for
“2-10 Volts” and Micro Board Program Jumper JP23
has been placed on pins 1 and 2. Calculate the setpoint
for various inputs as follows:
SETPOINT (%) = 100 –[(mA –4) X 4.375]
For example, if the input is 8mA, the setpoint would be
set to 83% as follows:
SETPOINT(%) = 100 –[(8 –4) X 4.375]
= 100 –(4 X 4.375)
= 100 –17.5
= 82.5
= 83%
PWM-The Pulse Width Modulation inputis in the form
of a 1 to 11 second relay contact closure that applies
115VAC to the I/O Board TB4-20 for 1 to 11 seconds.
As shown in Fig. 17, connect dry closure relay contacts
between I/O Board TB4-20 (signal) and TB4-1
(115VAC). The setpoint varies linearly from 100% to
30% as the relay contact closure time changes from 1
to 11 seconds. The relay contacts should close for 1 to
11 seconds at least once every 30 minutes to maintain
the setpoint to the desired value. If a 1 to 11 second
closure is not received within 30 minutes of the last clo-
FIG. 17 – REMOTECURRENTLIMITSETPOINT
WITHPWM SIGNAL
LD04502
sure, the setpoint is defaulted to 100%. A closure is
only accepted at rates not to exceed once every 70 sec-
onds. This input will only be accepted in “Digital” Re-
mote Mode. Calculate the setpoint for various pulse
widths as follows:
SETPOINT (%) = 100 –[(PULSE WIDTH IN SECONDS –1) X 7]
For example, if the relay contacts close for 3 seconds,
the setpoint would be set to 86% as follows:
SETPOINT(%) = 100 –[(3 –1) X 7]
= 100 –(2 X 7)
= 100 –14
= 86%
REMOTELEAVING CHILLED LIQUID SETPOINT with
0-10VDC, 2-10VDC, 0-20mA, 4-20mA or Pulse Width
Modulation Signal
Remote Leaving Chilled Liquid Temperature Setpoint
Reset can be accomplished by supplying (by others) a
0-10VDC, 2-10VDC, 0-20mA, 4-20mA or 1 to 11 sec-
ond Pulse Width Modulated (PWM) signal to the Con-
trol Center. The Leaving Chilled Liquid Tempera-
ture Setpoint is programmable over the range of 38°F
to 70°F (water applications), 36°F to 70°F (water appli-
cations with Smart Freeze Protection enabled) or 10°F
to 70°F (brine applications). The Remote Input Signal
changes the setpoint by creating an offset above the
locally programmed Leaving Chilled Liquid Tempera-
ture Base Setpoint value. The setpoint can be remotely
changed over the range of 10° or 20º F (as per the lo-
cally programmed Remote Reset Temperature
Range setpoint) above the Local Leaving Chilled Liq-
uid Temperature Setpoint. For example, if the Local
Setpoint is 40°F and the Remote Reset Tempera-
tureRange setpoint is programmed for 10°F, the Leav-
ingChilled Liquid Temperature setpoint can beremotely
reset over the range of 40°F to 50°F. The Control Cen-
ter must be configured appropriately to accept the de-
sired signal type as follows:
• The appropriate Remote Mode must be selected:
Analog Remote Mode must be selected when
using a voltage or current signal input. Digital Re-
mote Mode must be selected when using a PWM
input.
• If Analog Remote Mode is selected, the Remote
Analog Input Range setpoint must be set to
“0-10VDC” or “2-10VDC” as detailed below, re-
gardless of whether the signal is a voltage or cur-
rent signal type.

YORK INTERNATIONAL
12
• Micro Board Program Jumper JP24 must be posi-
tioned appropriately per the input signal type as de-
tailed below. It is recommended a qualified Service
Technician position this jumper.
Important! The signal type used for
Remote Leaving Chilled Liquid Tem-
perature setpoint reset and the signal
type used for Remote Current Limit
setpoint reset must be the same. For
example, if a 0-10VDC signal is be-
ing used for Remote Current Limit
Setpoint, then a 0-10VDC signal must
be used for Leaving Chilled Liquid
Temperature reset.
0-10VDC - As shown in Fig. 18, connect input to Mi-
cro Board J22-3 (signal) and J22-5 (Gnd). A 0VDC
signal produces a 0°F offset. A 10VDC signal produces
themaximum offset(10 or 20°Fabove theLocal Setpoint
value). The setpoint is changed linearly between these
extremes as the input varies linearly over the range of
0VDCto 10VDC. This input will only be acceptedwhen
“Analog” Remote Mode is selected., the “Remote
Analog Input Range” setpoint is set for “0-10VDC”
and Micro Board Program Jumper JP24 has been re-
moved. Calculate the setpoint for various inputs as fol-
lows:
OFFSET(°F)=(VDC)(REMOTERESET TEMP.RANGE)
10
SETPOINT(°F)= LOCAL SETPOINT + OFFSET
For example, if the input is 5VDC and the Remote Re-
set Temp Range setpoint is programmed for 10°F and
the Local Leaving Chilled Liquid Temperature setpoint
is programmed for 40°F, the setpoint would be set to
45°F as follows:
OFFSET (°F) = 5 X 10
10
= 50
10
= 5°F
SETPOINT (°F) = 40 + 5
=45°F
2-10VDC - As shown in Fig. 18, connect input to Mi-
cro Board J22-3 (signal) and J2-5 (Gnd). A 2VDC sig-
nal produces a 0°F offset. A 10VDC signal produces
the maximum allowed offset (10°F or 20°F above the
Local Setpoint Value). The setpoint is changed linearly
between these extremes as the input varies over the
range of 2VDC to 10VDC. This input will only be ac-
cepted when “Analog” Remote Mode is selected,
the “Remote Analog Input Range” setpoint is set
for “2-10VDC” and the Micro Board Program Jumper
JP24 has been removed. Calculate the setpoint for vari-
ous inputs as follows:
OFFSET (°F) = (VDC –2)(REMOTE RESET TEMP. RANGE)
8
SETPOINT (°F) = LOCAL SETPOINT + OFFSET
For example, if the input is 5VDC and the Remote Re-
set Temp. Range setpoint is programmed for 40°F, the
setpoint would be set to 43.8°F.
OFFSET(°F) =(5 –2)(10)
8
=(3)(10)
8
= 30
8
SETPOINT (°F) = 40 + 3.8
=43.8°F
SIGNAL
COMMON 5
4
+
J22
FIG. 19 – REMOTELEAVINGCHILLEDLIQUID TEMP.
SETPOINTWITH0-20MA OR 4-20MA
SIGNAL
LD04501
SIGNAL
COMMON 5
3
+
J22
FIG. 18 – REMOTELEAVING CHILLED LIQUID TEMP.
SETPOINTWITH 0-10VDCOR2-10VDC
SIGNAL
LD04500

FORM160.55-PW7
13
YORK INTERNATIONAL
OFFSET(°F) = (8 –4)(10)
16
=(4)(10)
16
= 40
16
= 2.5°F
SETPOINT(°F) = 40 + 2.5
=42.5°F
PWM – The Pulse Width Modulation input is in the
form of a 1 to 11 second relay contact closure that ap-
plies 115VAC to the I/O Board TB4-19 for 1-11 sec-
onds. As shown in Fig. 20, connect dry closure relay
contacts between I/O Board TB4-19 (input) and TB4-1
(115VAC). A contact closure time (pulse width) of 1
second produces a 0°F offset. An 11 second closure
producesthe maximum allowed offset(10 or 20°F above
thelocalsetpoint value). The relay contacts should close
for 1 to 11 seconds at least once every 30 minutes to
maintain the setpoint to the desired value. If a 1 to 11
second closure is not received within 30 minutes of the
lastclosure, the setpoint isdefaulted to the Localsetpoint
value. A closure is only accepted at rates not to exceed
once every 70 seconds. This input will only be accepted
in “Digital” Remote Mode. Calculate the setpoint
for various pulse widths as follows:
OFFSET(°F) =
(PULSE WIDTH IN SECONDS)(REMOTE RESET TEMP. RANGE)
10
SETPOINT(°F) = LOCAL SETPOINT + OFFSET
For example, if the relay contacts close for 5 seconds
and the Remote Reset Temp Range setpoint is pro-
grammed for 10°F, and the Local Leaving Chilled Liq-
uid Temperature setpoint is programmed for 40°F, the
setpoint would be set to 44°F as follows:
0-20mA - As shown in Fig. 19, connect input to Micro
Board J22-4 (signal) and J22-5 (Gnd). A 0mA signal
produces a 0°F offset. A 20mA signal produces the
maximum allowed offset (10 or 20°F above the local
setpointvalue). The setpoint is changedlinearly between
these extremes as the input varies over the range of 0-
20mA. This input will only be accepted when “Ana-
log” Remote Mode is selected, the “Remote Ana-
log Input Range” setpoint is set for “0-10VDC” and
Micro Board Program Jumper J24 has been placed on
pins 1 and 2. Calculate the setpoint for various inputs as
follows:
OFFSET (°F) = (MA)(REMOTE RESET TEMP RANGE)
20
SETPOINT(°F)= LOCAL SETPOINT + OFFSET
For example, if the input is 8mA, the Remote Reset
Temp Range Setpoint is programmed for 10°F and the
Local Leaving Chilled Liquid Temperature setpoint is
programmed for 40°F, the setpoint would be set to 44°F
asfollows:
OFFSET(°F) = (8)(10)
20
= 80
20
= 4°F
SETPOINT(°F) = 40 + 4
=44°F
4-20mA - As shown in Fig. 19, connect input to Micro
Board J22-4 (signal) and J22-5 (Gnd). A 4mA signal
produces a 0°F offset. A 20mA signal produces the
maximum allowed offset (10 or 20°F above the Local
setpointValue). Thesetpoint is changedlinearly between
these extremes as the input varies over the range of 0-
20mA. This input will only be accepted when “Ana-
log” Remote Mode is selected, the “Remote Ana-
log Input Range” setpoint is set for “2-10VDC” and
Micro Board Program Jumper JP24 has been placed on
pins 1 and 2. Calculate the setpoint for various inputs as
follows:
OFFSET(°F) = (MA –4)(REMOTE TEMP. RESET RANGE)
16
SETPOINT(°F)= LOCAL SETPOINT + OFFSET
For example, if input is 8mA, and the Remote Reset
Temp Range setpoint is programmed for 10°F and the
Local Leaving Chilled Liquid Temperature setpoint is
programmedfor 40°F,the setpoint wouldbe set to42.5°F
asfollows:
LD04503
FIG. 20 – REMOTELEAVINGCHILLEDLIQUID
TEMPERATURESETPOINTWITH PWM SIGNAL

YORK INTERNATIONAL
14
OFFSET(°F) = (5 –1)(10)
10
= (4)(10)
10
= 40
10
= 4°F
SETPOINT (°F) = 40 + 4
= 44°F
FIG. 21 – MICRO BOARD DIP SWITCH FOR POWER
FAILURE RESTART
This figure shows the location of the Power Failure
Restart Dip Switch on the Micro Board. The Micro
Board is mounted on the rear panel located directly be-
hind the Graphic Control Center door. Refer to the Con-
nectionDiagram pageof WiringDiagram, Form160.55-
PW4 (with Electro-Mechanical Starter), Form 160.55-
PW5 (with Solid State Starter), or Form 160.55-PW6
(with Variable Speed Drive). For orientation purposes
with the Connection Diagram, see Fig. 21.
1. Power Failure Restart Dip Switch - The Control
Panel is furnished for Manual Restart After Power
Failure as a standard function. The Control Panel
can be field-changed to Automatic Restart after
a power failure if the Manual Restart feature is
not desired. Simply place position 5 of the 12-posi-
LD04397
FIG. 22 –EXTERNALSIGNALFORREFRIGERATION
UNITFAILURE(NOTE 6)
FIG.22 – EXTERNAL SIGNAL FORREFRIGERATION
UNITFAILURE
When the Safety Shutdown Contacts (see Fig. 3) are not
connected to an Energy Management System they may
beemployedto energizea localorremote safetyalarm (by
others). When the normally open Safety Shutdown Con-
tacts close, the alarm will indicate shutdown of the unit.
The cause of shutdown will be one or more of the follow-
ingsafetycontrols:lowoil pressure;highoilpressure; high
condenserpressure;low evaporatorpressure;highoiltem-
perature; high discharge temperature; auxiliary safety;
powerfailurewhen the“AutoRestartAfterPowerFail-
ure” Dip Switch on the Micro Board (Fig. 21) is in the
OFFposition(SW1, position5= OFF),whichimplies that
the chiller requires “Manual Restart After Failure”.
tion Dip Switch (SW1) on ON and the Automatic
Restart feature will be enabled. Place to the OFF
position to return to Manual Restart.
2. English/Metric Display Units Configuration – The
Control Panel can present data on the Graphic Dis-
play in English or Metric Units. In Operator Ac-
cess Level, from the HOME screen, press the
“Setpoints” key to go to the SETPOINTS screen.
Next, press the “Setup” key to go to the SETUP
screen. Press the “User” key to go the USER
SETUP screen. Press the “English/Metric
Units” key to select the desired units. The data
field will toggle between English and Metric with
each press of the “ or ” key. For English
Units, the temperature display is in degree Fahren-
heit (°F), and absolute pressure is in pounds per
square inch (psia). For Metric Units, temperature
is in degrees Celsius (°C), and pressure in
KiloPascals (kPa).
J19 J20J15
SW1
50
49
63
1
1
1
2
3
4
5
6
7
8
9
10
11
12
OFF
1
J2
N.C.
GND
GND
GTX
GRX
DTRI
TXDI
RXDI
DSRI
N.C.
N.C.
GND
R12
DTR2
CTS2
TXD2
RTS2
RXD2
DSR2
DCD2 1
J13
JP34
JP35
JP36
JP37
J5
J18
J6
1
1
1J22
J21
J7 J8 J9
1
23
4
12
24 13
1
1111
JP24 JP23 JP22 JP21
JP41
JP42 JP40JP40JP40
JP39
111
22 12 20
10 1
11
1
1
4
51
J1
J10
J111
JP27
1SHLD
GND
+
_
5V
J11
SHLD
GND
+
_
5V
J11
SHLD
GND
+
_
5V J12
SHLD
GND
+
_
5V
MICROBOARD
031-01730
1
PC/104
2
1
J17
J16
FIG. 21 – MICROBOARD DIP SWITCH FORAUTO/
MANUALRESTARTAFTER POWER
FAILURE
LD04396
_ _

FORM160.55-PW7
15
YORK INTERNATIONAL
FIG.23 – RUNCONTACTS/REMOTERUN LIGHT AND
SHUTDOWN INDICATOR PLUS EMS
When run contacts are required for a Remote Run Light
and/or Shutdown Indicator AND Energy Management
Onsolidstate starterunits only,when theCurrentImbal-
ance option is selected via the Solid State Starter screen,
three phase current imbalance protection is provided. A
safety shutdown occurs (following a 45 second by-pass at
startup) whenever the % FLA readout exceeds 80% for
45 seconds continuously and the % imbalance is > 30%.
Whenallsafetycontrolsaresatisfied,andtheGraphicCon-
trol Center COMPRESSOR switch has been manually
“Reset” (de-energizing alarm) and returned to the RUN
position(“1”),the unitmaybe restarted,ifpanel isin“Re-
mote” mode, via the Remote Start contacts (Fig. 6); or, if
panelisin“local”mode bymomentarily pressingthe key-
pad compressor switch to the START (“”) position.
If the unit was shut down because of
Cycling Shutdown Contacts (see Fig.
2) the alarm will not be energized, but
the unit will have been shut down. A
closure of the safety alarm contacts
means that an operator must manu-
ally reset and restart the unit.
When the Safety Shutdown contacts close, the Graphic
Control Center will display the following message:
“SAFETY SHUTDOWN – MANUAL RESTART”,
and cause of shutdown.
_
LD04398
FIG. 23 – RUNCONTACTS/REMOTERUN LIGHT
ANDSHUTDOWN INDICATORPLUSEMS
System (EMS), connect (by others) as shown in the
diagram. The EMS, control relay, shutdown and run
lights are furnished by others. When the N.O. contacts
close,betweenterminals 35 and 36 on field wiring ter-
minal block TB2 in the Graphic Control Center, this in-
dicates that the unit is operating; the remote Run Light
will be energized. The unit run contacts open when the
unit is shutdown (safety or cycling) and the remote
indicatorwill then beenergized.For run contactsto EMS
only refer to Fig. 4. When terminals 35 and 36 are not
used for an EMS, they may be connected to a remote
Run Light. The control relay scheme shown in Fig. 23
can also be applied for a remote Run Light AND a
Remote Shutdown Indicator, when an EMS is not used.
When Evaporator Water is flowing, the flow switch con-
tact will close. If the flow switch opens for 2 seconds,
the unit shuts down and displays “CYCLING SHUT-
DOWN – AUTO RESTART” and “LEAVING
CHILLED LIQUID – FLOW SWITCH OPEN”. The
chiller will automatically restart when the switch again
closes. The flow switch status is checked 25 seconds
into “START SEQUENCE INITIATED” and continu-
ously thereafter.
FIG. 25 – EVAPORATORWATER PUMP INTERLOCK
ORFLOWSWITCH
LD04400
LD04399
FIG. 24 – AUXILIARYSAFETYSHUTDOWNINPUT
The closure of a Momentary or Maintained N.O. Switch
or Relay Contacts will cause the unit to shut down and
display: “SAFETY SHUTDOWN – MANUAL RE-
START” and “AUXILIARY SAFETY – CONTACTS
CLOSED”. The unit will not restart until the contacts
open and the keypad COMPRESSOR switch is moved
to the “STOP-RESET” position (“O”) and then to the
“START” (“ ”)position.
_

10. Lead selector and cycling control to provide similar
lead selection and cycling of lag units for three (3)
units is available: Kit No. 366-44684D (see Product
Drawing Form 160.00-PA1.1) in NEMA I enclosure.
Consult your YORK representative.
11. Sequence control kits (see Fig.9 and Note 10) as-
sume a constant chilled water flow and a constant
leaving chilled water temperature to sense the cool-
ing load. Sequence control kits are not designed for
variable chilled water flow or with reset of the leav-
ing chilled water temperature – see Figs. 18 to 20
and Note 2.
12. Maximum allowable current draw between circuits
24 and 2 for field installed devices is 2 amp hold-
ing and 10 amps inrush – see Graphic Control Cen-
ter Wiring Diagram Form No. in Note 1.
13. For required field wiring connections of the chilled
water pump contacts (terminals 44 and 45 on
Graphic Control Center field wiring terminal block
TB2) and chilled water flow switch (termin-
als 1 and 12 on Graphic Control Center field wir-
ing terminal board TB2), see Wiring Diagram – Field
Connections: Form 160.55-PW4, units having an
Electro-mechanical Starter; Product Drawing Form
160.55-PW5, units furnished with a YORK Solid
State Starter; or 160.55-PW6, units with a Variable
Speed Drive.
The chilled water flow switch is a safety control. It
must be connected to prevent operation of the chiller
whenever chilled water flow is stopped. The use of
the chilled water flow switch for purposes other than
protection of the chiller may be accomplished in sev-
eral ways. Two flow switches, a flow switch and a
relay or separate contacts on the same flow switch.
14.
15. Do not apply voltage on field wiring terminal blocks
TB4 and TB6 in YORK Graphic Control Center, as
115VAC source is fed from terminals 1 and 2 .
Proud Sponsor
of the 2000
U.S. Olympic Team
36USC380
P.O.Box1592,York,PennsylvaniaUSA 17405-1592 Subjecttochangewithoutnotice.PrintedinUSA
Copyright©byYork International Corporation 1999 ALLRIGHTSRESERVED
Form160.55-PW7(899)
Supersedes: Nothing
NOTES
1. This drawing shows recommended field control wir-
ing modifications (by others) to the standard Graphic
Control Center Wiring Diagram. Refer to Graphic
Control Center Wiring Diagram: Product Drawing
Form 160.55-PW1, units having an Electro-mechani-
cal Starter; Product Drawing Form 160.55-PW2,
units furnished with a YORK Solid State Starter; or
160.55-PW3, units with a Variable Speed Drive.
2. If more than one of these modifications is to be uti-
lized with a particular unit, additional consideration
must be given to the application to insure proper
functioning of the control system. Consult your
YORK representative.
3. The additional controls and wiring for these modifi-
cations are to be furnished and installed in the field
(by others). (See Warning on page 2.)
4. The controls specified are recommended for use,
but other controls of equal specifications are accept-
able.
5. All wiring shall be in accordance with the National
Electrical Code, and applicable State and Local
Codes.
6. Each 115VAC field connected inductive load, i.e. re-
lay coil, motor starter coil, etc., shall have a tran-
sient suppressor wired (by others) in parallel with
its coil, physically located at the coil. Spare transient
suppressors are furnished in a bag in the Graphic
Control Center.
7. The Graphic Control Center is factory furnished for
Manual Restart After Power Failure as a standard
function. The control center can be field changed
from Manual restart to Auto Restart after a power
failure by setting position 5 of Dip Switch SW1 to
the ON position - See Fig. 21.
8. Two (2) unit controls schemes are suitable for 8° –
12°F water range. Constant chilled water flow is
assumed at all loads. For other requirements contact
your YORK representative.
9.