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Instruction book
2920 1521 00 34
6 PROBLEM SOLVING
Before carrying out any maintenance or repair:
1. Stop the compressor, switch off the voltage and open the isolating switch.
2. Close the air outlet valve (2-Figs. 1.2/1.4 or 3-Figs. 1.5/1.6) and open the manual drain valve: valve
(1-Fig. 1.9) on Multi or the valve underneath the air receiver, if provided.
1 Compressor does not start
a Loose connection
a Have electrical connections checked
b Receiver pressure too high
b Compressor will start when the net pressure drops to the minimum pressure
2 Safety valve blows
a Safety valve opens too soon
a Replace valve
3 Compressor capacity or pressure below normal
a Air consumption exceeds capacity of compressor
a Check equipment connected
b Choked air filter
b Remove and check filter. Replace if necessary
c Safety valve leaking
c Replace valve
d Drive belt(s) slipping
d Check condition of belt(s). Correct or replace as required
4 Compressor module overheating / compressor shut down by its air temperature switch
a Insufficient compressor cooling
a Improve ventilation of compressor room.
b Cooling fan out of order
b Check and correct
On SF Full-Feature also:
5 Pressure dewpoint too high
a Shortage of refrigerant
a Have circuit repaired or recharged
b Refrigerant compressor does not run
b See 7
c Condenser pressure is too high
c See 6
6 Condenser pressure too high or too low
a Fan control switch out of order
a Have switch replaced
b Condenser fan motor out of order
b Have fan motor inspected
c Ambient temperature too high
c Improve ventilation. If necessary, draw the cooling air from a cooler room
d Condenser externally clogged
d Clean condenser
7 Motor of refrigerant compressor stops or does not start
a Thermal protection of the motor has tripped
a Compressor will restart when the motor windings have cooled down