Product Manual

9 Problem solving
Before carrying out any maintenance or repair, perform following steps:
•
Stop the compressor and switch off the voltage.
• Open and lock the isolating switch to prevent an accidental start.
• Isolate the compressor by closing the outlet valve.
• Depressurize the system by opening the drain valve(s).
Compressor
Condition Fault Remedy
The compressor does
not start.
Pressure too high. Compressor will start again when the
pressure drops to the starting pressure.
Loose connection. Check all electrical connections.
Safety valve blows. Pressure too high Check settings and correct.
Safety valve opens too soon. Replace valve.
Compressor capacity
or pressure below
normal.
Air consumption exceeds capacity of
compressor.
Check equipment connected.
Choked air inlet filter. Remove and check filter. Replace if
necessary.
Safety valve leaking. Replace valve.
Compressor element out of order. Consult your supplier.
Compressor module
overheating or
compressor shutdown
on high air
temperature.
Insufficient compressor cooling. Improve ventilation of compressor room.
Clean compressor element fins and fan,
see Cleaning the compressor element.
Cooling fan out of order. Check and correct.
Condensate trap
continuously
discharging air an
water
Automatic drain out of order Have the drain checked. Replace as
necessary
Refrigerant dryer
For compressors with a built-in refrigerant dryer also:
Condition Fault Remedy
Dew point too high Air inlet temperature too high Check and correct; see section
Reference conditions and limitations
Fuses blown Check fuses and remedy the cause.
Shortage of refrigerant Have circuit repaired or recharged.
Refrigerant compressor does not run See below
Evaporator pressure is too high See below
Condenser pressure is too high See below
Instruction book
2920 7110 21 133