BOCK FK40 Seroes - Oil Problems; Abnormal Running Noise from Compressor

Oil problems
Oil pressure too low
Symptom
Possible cause
Remedy
- Refrigerant in oil
- Too little oil in compressor
- Oil filter dirty / blocked
- see Oil foams"
- Add oil and search for the cause of
oil loss
- Clean / replace oil filter
Change oil
Oil foams during start-
up phase
- Liquid refrigerant has moved into the oil
sump
- Check the laying of pipes
- Installation of the check valve in the
discharge line
- Installation of the solenoid valve in the
liquid line
- Check the control
Oil foams during
operation
- Expansion valve not functioning
- Adjust / replace expansion valve
Oil level decreases
- During start-up, a portion of the oil is carried
to the refrigeration plant with the refrigerant
- Refrigerant in oil
- Piston rings worn
- Suction / discharge laminations of the valve
plate leaking
- Refrigerant and oil get mixed.
After some time the oil level should
stabilize.
Add oil, if necessary.
- see Oil foams during
operation
- Replace piston rings
- Replace valve plate
Abnormal running noise from compressor
Fixation of compressor
is loose
Symptom
Possible cause
Remedy
- Screwed connections hava become loose
- Securing elements for screwed
connections missing
- Vibration metals defective
- Tighten the screwed connections and
secure them anew
- Replace vibration metals
Liquid shock
- Liquid refrigerant reaching the compressor
- Oil shocks because of too much oil
- Adjust / check expansion valve
Check refrigerant filling
Check evaporator fan
Icing-up of the evaporator
- Check oil level
Check the dimensioning of pipes (gas
velocity)
Replace worn piston rings
Capacity regulator
(accessory)
- switching on and off constantly / oscillating
- defective
- Check the control
- Replace capacity regulator valve
Electromagnetic clutch
slipping
- see also p. 16 Malfunction of electro-
magnetic clutch
- Checking
V belt drive, increased
noise generation
- Belts vibrating excessively
- Incorrect alignment of compressor and motor
- Check belt tension
Use tensioning roller / guidance roller
- Check alignment and adjust anew
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09608-09-03-DGbFEI