BOCK FK40 Seroes - Cooling Performance too Low

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Cooling performance too low
Suction pressure too
high
Symptom
- Evaporator iced up
- Expansion valve not functioning properly
- Lack of compressor capacity
Possible cause
- Remove the cause
- Check valve setting; replace valve, if
necesaary
- Check the functioning of the compressor
by evacuating to vacuum.
Check function of capacity regulator
(accessory)
Remedy
Suction pressure too low
High-pressure too high
High-pressure too low
- See "Cutoff through low-pressure switch"
- See "Cutoff through high-pressure switch"
- Condenser being cooled to much
- Lack of compressor capacity
- Pressure laminations of valve plate leaking
By-pass between suction and discharge
side
- Checking
- Checking
- Adjust the control of condenser
cooling
- Check compressor / Check the functioning
of capacity regulator
- Replace valve plate
Localize leak between the discharge and
suction side and repair it
Cooling temperature too high
Suction gas
temperature too high
Symptom
- Suction gas overheating
- Too little refrigerant filling
- Liquid filter blocked
Possible cause
Remedy
- Adjust expansion valve
Insulate the gas suction line
- Establish the operating filling (see
Operating Instruction for the refrigeration
plant) Localize leak
- Clean / replace filter / dryer
Discharge pipe
temperature too high
- Suction gas temperature too high
Condensing pressure too high
- Operating limits of compressor
exceeded
- Cooling insufficient
- Short circuit between the discharge and
the suction side of compressor
- Valve plate damage
- Internal safety valve has opened
see point above
see Cutoff through high-pressure
switch
see Cutoff through heat-protection
thermostat
- Replace defective valve plate
- Replace safety valve
(see the section on Dismantling /
Assembly of Compressor)
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09608-09-03-DGbFEI
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