Operation
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IOM 1274-3 • CENTRIFUGAL WATER CHILLERS
Compressor Controller Inputs and Outputs
The following tables list analog inputs and digital outputs for the compressor controller as well as the stepper motor outputs.
Table 28: Compressor Controller, Analog Inputs
Description
Source
Signal
Sensor Range
Oil Sump Pressure
0.5 to 4.5 VDC nominal
Oil Feed Pressure to Compressor
0.5 to 4.5 VDC nominal
Oil Sump Temperature
10k @ 25°C
-40 to 125°C
Oil Feed Temperature
10k @ 25°C
-40 to 125°C
Compressor Suction Temperature
NTC Thermistor
10k @ 25°C
-40 to 125°C
Compressor Discharge Temperature
NTC Thermistor
10k @ 25°C
-40 to 125°C
Evaporator Suction Refrigerant Pressure
Sealed Gage Transducer
0.5 to 4.5 VDC nominal
0 to 132 psi
Condenser Discharge Refrigerant Pressure
Sealed Gage Transducer
0.5 to 4.5 VDC nominal
0 to 410 psi
Motor Current
Sealed Gage Transducer
0 to 10 VDC nominal
0 TO 200%
Leaving Evaporator Water Temperature
NTC Thermistor
10k @ 25°C
-40 to 125°C
Table 29: Compressor Controller, Digital Inputs
Description
Signal
States (Open / Closed)
Compressor Switch - Manual Off
0 to 24 VAC
Stop / Auto
Mech High Pressure
0 to 24 VAC
High Pressure / Ok
Motor High Temperature
0 to 24 VAC
High Temp / Ok
Vanes Closed Switch
0 to 24 VAC
Not Closed / Closed
Starter Transition
0 to 24 VAC
No Transition / Transition
Starter Fault
0 to 24 VAC
Fault / No Fault
Evaporator Water Flow Switch
0 to 24 VAC
No Flow / Flow
Condenser Water Flow Switch
0 to 24 VAC
No Flow / Flow
Vanes Open Switch
0 to 24 VAC
Not Open / Open
Table 30: Compressor Controller, Analog Outputs
Description
Signal
Sensor Range
Compressor VFD Speed
0 to 10 VDC
0 to 100%
Oil Cooler Electronic Valve
0 to 10 VDC
0 to 100%
Hot Gas Bypass
0 to 10 VDC
0 to 100%
Table 31: Compressor Controller, Digital Outputs
Description
Source
Output OFF
Output ON
Compressor Motor Control Relay
Relay
Compressor OFF
Compressor ON
Hot Gas Bypass
Solenoid
No Bypass
Bypass
Liquid Injection
Solenoid
No Injection
Injection
Oil Pump
Contactor
Pump OFF
Pump ON
Oil Sump Heater
Relay
Heater OFF
Heater ON
Vane Pulse
Solenoid
Hold
Move Vanes
Vane Load/Unload
Solenoid
Unload
Load