PRODUCT USER MANUAL SECTION 3
128
3.62 TROUBLESHOOTING
Problem Possible Cause Repair Comments
Dryer is switched on,
indicator light is lit but the
refrigerant compressor
does not turn on.
3-phase dryers: The con-
nection 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 compres-
sor
Several factors can cause com-
pressor failure. A qualified refrig-
eration technician needs to check
all the electrical and refrigerant
circuit and controls.
The refrigerant high pres-
sure protection has
tripped
The refrigerant safety high
pressure switch has tripped.
The dryer is protected against
excessively high refrigerant pres-
sure. If the condenser efficiency
has reduced, the switch will trip.
In case of water cooled con-
densers, check the water con-
trol valve
1-phase dryer: manually reset
the switch (green button)
3-phase dryer: pressure Switch
will automatically reset.
Excessive ambient tem-
perature
Be sure that dryer is working
in temperatures lower than the
design conditions. Designed
conditions and correction fac-
tors are described in this man-
ual .
A high ambient temperature may
cause the refrigerant system to
operate at higher than normal
pressures. Results will be higher
than normal evaporator tempera-
ture. Important: adequate air cir-
culation around the dryer, and
proper ventilation in the equip-
ment room should guarantee a
low enough ambient temperature.
Dryer is switched on,
indicator light is lit but the
refrigerant compressor
does not turn on.
Excessive temperature on
crankcase of compressor.
Allow time to compressor to
cool down. Reason may be a
possible maladjustment of hot
gas bypass or shortage of
refrigerant
Compressor is protected against
overly high temperatures of the
crankcase by a thermal switch
called “Klixon”.
Klixon can be located internally in
the refrigerant compressor or
under the protective cover with
the electrical connections to the
compressor.
Excessive compressed
air inlet temperature.
Be sure that dryer is working
in temperatures lower than
design conditions.
The dryer is designed for working
into calculated conditions (see
description in this manual). If con-
ditions are exceeded, the dryer
will be overflowed, dew point will
go up and protecting devices can
switch off.
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