3. Move dryer on/off switch (3) to position 0 to switch off the voltage. See section
Stopping.
4. Open the isolating switch (4) to prevent an accidental start.
Warning:
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 7210 40 29
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