7 Problem solving
Warnings
•
Before starting any maintenance or repairs, close the air outlet valve and press the
test button on top of the electronic water drain to depressurise the air system.
•
Apply all relevant instructions in section Safety precautions during maintenance or
repair.
Faults and remedies
Condition Fault Remedy
Pressure dew point too high Air inlet temperature too high Check and correct. If necessary,
install a pre-cooler
Ambient temperature too high Check and correct. If necessary,
draw cooling air via a duct from a
cooler place or relocate the
dryer.
Air inlet pressure too low Increase inlet pressure
Dryer capacity exceeded Reduce air flow
Shortage of refrigerant Have circuit checked for leaks
and have the refrigerant circuit
recharged
Condition Fault Remedy
Condenser pressure too high or too
low
Fan control switch out of order Replace
Fan or fan motor out of order Check fan/fan motor
Ambient temperature too high Check and correct. If necessary,
draw cooling air via a duct from a
cooler place or relocate the
dryer.
Condenser externally clogged Clean condenser
Condition Fault Remedy
Compressor stops or does not start Electric power supply to compressor
is interrupted
Check and correct as necessary
Thermic protection of refrigerant
compressor motor has tripped
Motor will restart when motor
windings have cooled down
On three-phase units, phase
sequence relay fault indication
Reverse two incoming electric
lines.
Instruction book
2920 7103 90 53
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