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JOB DATA:

CHILLER MODEL NO. YT _______________

CHILLER MODEL NO. YT _____________________

NO. OF UNITS ________________________

NO. OF UNITS ______________________________

TYPE OF STARTING ___________________

TYPE OF STARTING _________________________

Included by YORK for Field Installation (by others) are:

YES

NO

PER UNIT

One – Two Unit Sequence Control Kit, Part No. 466-61597T

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Condenser Water Flow Switch

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________________________________________________________

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________________________________________________________

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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
through a field wiring terminal board in the 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-

tact rating shall 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
centrifugal compressor is limited to one start per 30 min-
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

Summary of Contents for MILLENNIUM YT J

Page 1: ...isions 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 through a field wiring...

Page 2: ...f 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 mot...

Page 3: ...ical 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 Wi...

Page 4: ...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 remot...

Page 5: ...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 ANTICIPAT...

Page 6: ...essor from the Graphic Control Cen ter and prevent the chiller from restart ing However the operator cannot lo cally start the compressor using com pressor start switch when the con trol center is in...

Page 7: ...e following message CYCLING SHUTDOWN AUTO RE START and CONDENSER FLOW SWITCH OPEN LD04390 FIG 8 MULTI UNIT SEQUENCE FIG 9 CONDENSER WATER FLOW INTERLOCK LD04391 FIG 8 MULTI UNIT SEQUENCE For multiple...

Page 8: ...T 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 follo...

Page 9: ...ature 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 in...

Page 10: ...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...

Page 11: ...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...

Page 12: ...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...

Page 13: ...ed offset 10 or 20 F above the local setpoint value The setpoint is changed linearly between these extremes as the input varies over the range of 0 20mA This input will only be accepted when Ana log R...

Page 14: ...em perature high discharge temperature auxiliary safety power failure when the Auto Restart After Power Fail ure Dip Switch on the Micro Board Fig 21 is in the OFFposition SW1 position5 OFF whichimpli...

Page 15: ...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 between terminals 35 and 36 on field wiring ter...

Page 16: ...onsor of the 2000 U S Olympic Team 36USC380 P O Box 1592 York Pennsylvania USA 17405 1592 Subject to change without notice Printed in USA Copyright by York International Corporation 1999 ALL RIGHTS RE...

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