GEA HG34P Series, Руководство по обслуживанию

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5
96
19
4-
05
.2
01
6-
Gb
Compressor cutoff
Compressor starts and stops again
Problem Possible cause Remedy
Cutoff through lowpressure
switch Suction pressure too low:
- Check the setting of the low pressure switch
- Adjust the switching points or replace switch
- Suction valve of the compressor closed - Open suction valve
- Capacity of compressor too large - Check operating conditions
- Refrigerant deficiency - Leak test / add refrigerant
- Filter / dryer in the liquid line blocked - Replace filter / dryer
- Expansion valve not functioning properly - Check the setting of the expansion valve
- Solenoid valve on the liquid line not opening - Check the control / function
Cutoff through highpressure
switch Condensing pressure too high:
- Check the setting of the high-pressure switch - Adjust the switching points or replace switch
- Pressure valve of the compressor closed - Open the pressure valve
- Condenser fan not functioning - Check the control / replace motor
- Condenser fan is dirty - Cleaning of condenser
- Excessive refrigerant filling - Extract refrigerant to normal filling
- Non-condensible gases in refrigerant - Extract refrigerant and evacuate the
refrigeration plant / refill refrigerant
Cutoff through heatprotection
thermostat (accessory) Discharge end temperatures is too high
- Operating limits of compressor exceeded
- Adapt the operating conditions
to the operating range
- Suction gas overheating - Check expansion valve / check
insulation on the suction side
- Refrigerant of the condenser insufficient - Check fan motors / Clean the condenser
- Valve plate damage - Replace valve plate
- Internal safety valve has opened - Replace safety valve
-> Check compressor and refrigeration plant
Determine and remove the cause for the
inadmissible high pressure in the high-
pressure side
Cutoff through control
thermostat Temperature over / below the desired range Check operating points
Cooling control or other switch /
control devices are switched off Setting / selection incorrect - Check control design
- Change control
Function / drive incorrect - Check drive / function
- Check cables, contacts etc.
2 I Fault diagnosis
Problem Possible cause Remedy
Overload / Motor safety switch
is tripped Two phase run Ensure three phase run
Very unequal phase runs Determine and remove the cause