GEA FK40 Series User Manual

13
09665-08.2018-Gb
6 I Fault diagnosis
Refrigerant temperature too high
Problem Possible cause Remedy
Suction gas temperature
too high
- Suction gas overheating
- Adjust expansion valve
Insulate the gas suction line
- Too little refrigerant lling - Establish the operating lling (see Operating
Instruction for the refrigeration plant),
localize leak
- Liquid lter blocked - Clean / replace lter / dryer
- Shortage of refrigerant - Run leakage test / rell refrigerant
Discharge pipe temperature
too high
- Suction gas temperature too high
(Condensing pressure too high)
- Adjust expansion valve
Insulate the gas suction line
- see „Cutoff through high-pressure switch“
- Operating limits of compressor exceeded - see „Cutoff through heat-protection
thermostat“
- Cooling insufcient - Check refrigerant lling
- Adjust expansion valve
- Short circuit between the discharge and the
suction side of the compressor
- Check gaskets on valve plate /
change
- Valve plate damage - Replace valve plate
- Internal decompression valve has opened - Replace decompression valve (see the section-
on Disassembly / Assembly of Compressor)
Oil problems
Problem Possible cause Remedy
Oil pressure too low
- Refrigerant in oil - see „Oil foams“
- Too little oil in compressor - Add oil and search for the cause of oil loss
- Oil lter dirty / blocked - Clean / replace oil lter
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 operating
- 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 and oil get mixed. After some time
the oil level should stabilize.
Add oil, if necessary.
- Refrigerant in oil - see „Oil foams during start-up phase“
- Piston rings worn - Replace piston rings
- Suction / discharge laminations of the valve
plate leaking
- Replace valve plate

GEA FK40 Series Specifications

General

Brand	GEA
Model	FK40 Series
Category	Air Compressor
Language	English