Product Manual PM WSC/WDC 69
F. CONTROL PANEL
A microprocessor based control panel shall be fully wired and factory-mounted on the chiller
and have the following features:
1. The display shall have a minimum of 160-character liquid crystal display and be
backlit with a light emitting diode. Messages shall be in plain English. Coded two or
three character displays are not acceptable.
2. The following information shall be available on the display with simple entry on the
keypad:
a) Entering and leaving chilled and condenser water temperatures
b) Evaporator, suction, discharge, condenser, and liquid temperatures
c) Suction and discharge superheat
d) Liquid subcooling, evaporator and condenser approach temperatures
e) Evaporator, condenser, and compressor lift pressures
f) Oil feed and sump temperatures
g) Oil pump discharge and oil differential pressure
h) Motor amps and amps as a percent of rated load amps
i) Hours of operation and number of starts, time of last start and stop
j) Chilled water setpoint and reset temperature setpoint
k) Amp limit for manual and remote
l) History for last 8 faults with date and time plus critical sensor values
m) Unit status; start-up and shutdown sequence, operational status
3. The microprocessor shall either unload or shut down the compressor during an
abnormal condition. At a minimum the following safeties shall be incorporated in the
control system:
a) High and low discharge pressure
b) Low evaporator pressure
c) High discharge temperature
d) Chilled or condenser water pump failure
e) No evaporator or condenser water flow
f) High or low oil feed temperature
g) Low oil differential pressure
h) High motor temperature, low motor current
i) Surge-high suction superheat
j) Starter fault, no starter transition
k) Vanes open during start sequence
l) Sensor failure, specific to sensor
4. Controller shall hold leaving chilled water temperature to within 0.2°F. without
hunting, droop, or overshooting.
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