Section 7
147
TROUBLESHOOTING
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE REPAIR COMMENTS
Dryer is switched ON,
indicator Light is lit and
but the refrigerant
compressor does on turn
ON (Dryer is not
functioning)
3-phase dryers: The
connection has inverted
phases
Invert two phases 3-phase dryers are equipped
with a phase controller to avoid
the fans from turning in the
opposite direction.
Refrigeration unit is not
functioning
Check refrigeration
compressor
Several factors can cause
compressor failure. A qualified
refrigeration technician needs to
check all the electrical and
refrigerant circuit and controls.
The refrigerant high
pressure protection has
tripped
The refrigerant safety
high pressure switch has
tripped.
The dryer is protected against
excessively high refrigerant
pressure. If the condenser
efficiency has reduced, the
switch will trip.
In case of water cooled
condensers, check the
water control valve
1-phase dryer: manually reset
the switch (green button)
3-phase dryer: pressure switch
will automatically reset, but it is
necessary to manually restart
dryer by pressing on the green
push button.
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