DX type water-cooled screw chiller (PCB Control) MCAC-CTSM-2014-03
38
Thermistor replacement
To Replace Thermistors RT1, RT2, RT3, RT4, RT5, or RT6 (Entering/Leaving chilled Water;
Entering/Leaving cooling Water; Discharge Temperature; Oil temperature) — Disconnect appropriate
connector from the PCB controller. New thermistors should be spliced to existing wiring close to the
connector unless new connectors are required. Remove thermistor cable from harness. Remove and
discard original thermistor from well. Insert new thermistor in well body to its full depth. Add a small
amount of thermal conductive grease to thermistor probe and well. Tighten the screw to prevent
thermistors from slipping out of the well.
To Service Compressor Motor Thermistors
A thermistor is factory installed in each compressor. Connections for the thermistors are located in the
compressor wiring box. 2 terminals are reserved for the thermistor: S1 and S2. Motor temperature is
measured by leads connected to S1 and S2 terminal. The thermistors are not serviceable in the field. If
the compressor motor thermistor fails, compressor replacement is required.
2).Pressure sensors
The pressure sensors are pressure transmitters, including high pressure, low pressure, EXV suction
pressure transmitters. Danfoss AKS3000 are used.
Water temp. thermistor Suction temp. thermistor Pressure transmitter AK3000
To Next Page