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Form 160.80-PW5 (999), Wiring Diagram Field Control Modifications, Product Drawing JOB DATA:
CHILLER MODEL NO. YS _______________
CHILLER MODEL NO. YS _____________________
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 160.80-PW5 (999)
WIRING DIAGRAM
FIELD CONTROL MODIFICATIONS
MILLENNIUM MODEL YS CHILLERS (STYLE E)
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 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 PULL-
DOWN DEMAND LIMIT function provided in
the Graphic Control Center. The Pulldown De-
mand Limit key can be programmed to limit com-
pressor 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
160.80-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-
mote current 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-
stalled in the Control Center. 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 chillers leaving chilled
water and current limit setpoints.
ENERGY MANAGEMENTS SYSTEMS (CONTD)
External wiring, unless specified as
an optional connection in the
manufacturers product literature, is
not to be connected inside this cabi-
net. Furthermore, auxiliary devices
such as relays, switches, transducers and controls
may not be installed inside this enclosure. All
wiring must be in accordance with YORKs 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 manufacturers warranty
and may cause serious damage to property or in-
jury to persons. FORM 160.80-PW5
3
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-unit Sequence .......................................................................................................................
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 PW