CVHE-SB-32A 22
Problem 52: Oil temperature High.
Corrective action:
1 Check oil temperature setpoint in service settings.
2 Bad Circuit module heater relay output.
3 Defective oil temperature sensor.
4 Compressor bearings.
5 Oil cooler.
Problem 53: Oil temperature Low (Startup)
Corrective Action:
1 Defective Circuit module relay output.
2 Oil temperature sensor.
3 Replace oil heater.
4 Raise the oil temperature setpoint.
5 Excessive refrigerant in the oil. Check the oil eductor valve. It should be 2 turns open.
Problem 54: Low Oil Temperature (Running)
Corrective Action:
1 The refrigerant pump shaft seal is leaking. Remove the refrigerant pump volute and impeller.
Check and replace the shaft seal.
2 The oil tank is being flooded with excessive refrigerant. Check the oil eductor valve
(evaporator to oil tank line) at the evaporator. Close it and open 2 turns. If the chiller is
exposed to outside ambient/cold temperatures, it may be overcooling the oil/tank, in which
case the tank needs insulating.
3 The oil tank heater is off when the unit is running (Trane Service Alert 206). A UCP2 software
change was made 6/98 so that the chiller is allowed to operate at a condition of saturated
evaporator temperature plus 30°F. Take this into consideration when diagnosing this
problem. Look at the saturated evaporator temperature to see where your are in operation.
Problem 55: Enhanced oil temperature function not working.
Correction Action:
1 Enable enhanced oil temperature in the service setting menu (the default is enabled.) If
enhanced oil temperature is disabled, you will get two additional screens to set oil
temperature setpoint and low oil temperature setpoint.
2 Chiller module X-13650450-12 or greater is required.
3 Circuit module X-13650451-13 or greater is required.
4 CLD X-13650448-11 or greater is required.
Problem 56: Oil Pump Discharge Pressure Sensor Diagnostic and Oil Pressure Calibration.
Corrective Action.
Chiller is in a high vacuum where one or both of the transducers reads -14.9 psig.
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