Attention
Use only authorised parts. Any damage or malfunction caused by the use of
unauthorised parts is not covered by Warranty or Product Liability.
Apply all relevant safety precautions.
Before carrying out any maintenance or repair work on the dryer:
Close air inlet and outlet valves (1) of the dryer.
Move dryer on/off switch (3) to position 0 to switch off the voltage. See section Stopping.
Open the isolating switch (4) to prevent an accidental start.
The air inlet and outlet valves (1) can be locked during maintenance or repair
work as follows:
• Close the valve.
• Using a wrench, remove the screw fixing the handle.
• Lift the handle and turn it until the slot of the handle fits over the blocking edge on
the valve body.
• Fit the screw.
Faults and remedies
Condition Fault Remedy
1 Pressure dewpoint 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
Adjust the pressure switch
Dryer capacity exceeded Reduce air flow
Shortage of refrigerant Have circuit checked for leaks and
recharged
Refrigerant compressor does
not run
See 3
Evaporator pressure too high See 5
Condenser pressure too high See 2
2 Condenser temperature too
high or too low
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 room or relocate the dryer
Condenser externally clogged Clean condenser
3 Compressor stops or does not
start
Electric power supply to
compressor is interrupted
Check and correct as necessary
Thermal protection of
refrigerant compressor motor
has tripped
Reset the thermostatic protection
Restart of the dryer has been
too fast, not enough time for
pressure balancing
Wait a few minutes and restart
Instruction book
2920 7112 40 29
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