Fault diagnosis
In case of malfunctions during compressor operation we recommend to prepare a
measurement record for aiding the fault search:
Pressure measurement: Discharge side, suction side, oil pressure
Temperature measurement: Compressor casing, discharge end temperature, suction gas
overheating
According to the expected cause of the fault it may be necessary to check the electrical
system for faults in the control.
In order to localize the causes of operating malfunctions as easy as possible we have
compiled the following table with suggestions for remedying compressor malfunctions.
Fault diagnosis
Function faults-Symptoms
Function faults arising most frequently and their symptoms are:
Compressor stoppage, compressor cutoff
- Compressor does not start
- Compressor starts and then stops again
Cooling performance too low
Too high compressor temperature
Oil problems
Abnormal compressor running noise
Malfunction of the electromagnetic clutch
Compressor stand still
Compressor does not start
Symptom
Open circuit
Possible cause
- Fuse blown
Cutoff through:
- Low pressure switch
- High pressure switch
- Heat protection thermostat
- Control thermostat
- Other safety elements
Remedy
- Replace fuse
Determine and remove the cause
- Localize the interruption in the circuit and
remove the cause of the interruption
- Checking
- see also p.16 Malfunction of
electromagnetic clutch
Malfunction of
electromagnetic clutch
09608-09-03-DGbFEI
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