PRODUCT
DRAWING
CONTRACTOR _______________________
PURCHASER ____________________________________________
ORDER NO. _________________________
JOB NAME ______________________________________________
YORK CONTRACT NO. _________________
LOCATION _____________________________________________
YORK ORDER NO. ____________________
ENGINEER ______________________________________________
REFERENCE
DATE ________
Supersedes: 160.67-PW2 (204)
Form 160.67-PW2 (1007)
WIRING DIAGRAM
FIELD CONTROL MODIFICATIONS
M
AX
E
™ MODEL YST CHILLERS (STYLE F)
JOB DATA:
CHILLER MODEL NO. YST ______________ CHILLER MODEL NO. YST ______________
NO. OF UNITS _____________
NO. OF UNITS _____________
Included by YORK
®
for Field Installation (by others) are:
YES NO
PER UNIT
Condenser Liquid Low Pressure Differential
________
Chilled Liquid Low Pressure Differential Switch
________
Tachometer (On Optional Turbine Gaugeboard)
________
___________________________________
________
APPROVAL
DATE ________
CONSTRUCTION
DATE ________
ENERGY MANAGEMENT SYSTEMS
MaxE
™
chiller design allows for ease of interfacing with
Energy Management Systems (EMS). The OptiView
™
Control Center includes unit status contacts, provisions
for remote control inputs and provisions for remote
setpoint reset of leaving chilled liquid temperature and
horsepower limit for EMS interfacing. Refer to para-
graph 4 on page 2.
Five sets of unit status contacts are factory furnished
through a
fi
eld wiring terminal board in the OptiView
™
Control Center. Each set of contacts are single pole,
normally open, rated at 5 amperes resistive at 240VAC.
Chiller status contacts are provided for the unit:
• Remote Mode Ready to Start - Refer to FIG. 1.
• Cycling Shutdown - Refer to FIG. 2.
• Safety Shutdown - Refer to FIG. 3.
• Run (System Operating) - Refer to FIG. 4.
• Anticipatory Alarm - Refer to FIG. 5.
Three sets of inputs are available to the EMS, allowing
for remote control of unit operation. Input device contact
rating shall be 5 milliamperes at 115 VAC. Field wiring
terminal board (TB4) in the OptiView
™
Control Center
permits connection for the following operation:
• Remote Stop Contacts - Refer to FIG. 6.
• Remote Start Contacts - Refer to FIG. 6.
• Remote/Local Cycling Devices (Controlled Shut-
down) Refer to FIG. 7.
It is possible to limit the power consumption of the chiller
indirectly or directly by the following methods.
1. Chilled liquid pump control contacts (Refer to Notes
7 & 8 on Page 15) are provided, allowing for ef
fi
cient
automatic operation of the chilled liquid pump to
reduce energy. The chilled liquid pump is not started
until after the turbine has been slow rolled, when the
ramp-to-rated speed is initiated. It is run during opera-
tion and coast down then automatically stopped 70
seconds after the drivetrain has coasted to a complete
stop.
