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Controller Inputs and Outputs
As outlined below, inputs and outputs vary between the unit controller and the compressor controller.
Unit Controller Inputs and Outputs
The following tables list the unit controller inputs and outputs, both analog and digital, as well as the stepper motor outputs.
Table 21: Unit Controller, Analog Inputs
Description Wiring Source Signal Sensor Range2
Entering Evaporator Water Temperature Chiller NTC Thermistor 10k @ 25°C -40 to 125°C
Entering Condenser Water Temperature Chiller NTC Thermistor 10k @ 25°C -40 to 125°C
Leaving Condenser Water Temperature Chiller NTC Thermistor 10k @ 25°C -40 to 125°C
Liquid Line Refrigerant Temperature Chiller NTC Thermistor 10k @ 25°C -40 to 125°C
Evaporator Water Flow Rate Field Water Flow Sensor 4 to 20 mA Current 0 to 10,000 gpm
Condenser Water Flow Rate Field Water Flow Sensor 4 to 20 mA Current 0 to 10,000 gpm
Reset of Leaving Water Temperature Field BAS 4 to 20 mA Current 0 to 100%
Demand Limit Field BAS 4 to 20 mA Current 0 to 100%
Entering Heat Recovery Temp Chiller NTC Thermistor 10k @ 25°C -40 to 125°C
Leaving Heat Recovery Temperature Chiller NTC Thermistor 10k @ 25°C -40 to 125°C
NOTE: Table 21 indicates the range of the input, NOT the operating range of the chiller.
Table 22: Unit Controller, Digital Inputs
Description Wiring Signal Source States (Open / Closed)
Chiller Isolated Switch Contacts Stop / Auto
Remote Start/Stop Field Isolated Switch or Relay Contacts Stop / Start
Mode Switch Chiller Isolated Switch Contacts Cool / Ice or Heat
Table 23: Unit Controller, Analog Outputs
Description Signal Sensor Range
Cooling Tower Bypass Valve Position 0 to 10 VDC 0 to 100% Open
Cooling Tower VFD Speed 0 to 10 VDC 0 to 100%
Electronic Expansion Valve 0 to 10 VDC 0 to 100% Open
NOTE: Table 23 indicates the range of the output, NOT the operating range of the chiller.
Table 24: Unit Controller, Digital Outputs
Description Source Rating
Alarm Indicator Light 120 VAC
Pump Contactor 240 VAC
Pump Contactor 240 VAC
Pump Contactor 240 VAC
Pump Contactor 240 VAC
Fan Contactor 240 VAC
Fan Contactor 240 VAC
Fan Contactor 240 VAC
Fan Contactor 240 VAC
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