RH SERIES—HIGH TEMPERATURE SECTION 2
32
2.14 TROUBLESHOOTING
IMPORTANT
Before starting maintenance activity or repair
on the dryer, the main power switch and ON/
OFF switch must be turned OFF. Also, the
compressed air must be vented from the sys-
tem and the inlet and outlet valves must be
closed. The dryer has to be isolated com-
pletely.
PROBLEM POSSIBLE CAUSE REPAIR COMMENTS
Dryer-on light is lit but
refrigerant compressor is
not operating
cont.
Refrigeration unit is not
operating
Check refrigeration com-
pressor
Several factors may cause compres-
sor failure.
A qualified refrigeration contractor
should check all electrical and refrig-
erant control
The refrigerant high pres-
sure protection has
tripped
The refrigerant safety
high pressure switch has
tripped
The dryer is protected against a very
high refrigerant pressure. It will trip in
case the condenser efficiency is
reduced
Manually reset the switch (green but-
ton)
Excessive ambient tem-
perature
Ensure that dryer inlet
conditions are within the
recommended range.
Designed conditions and
correction factors are
described in product liter-
ature.
A high ambient temperature may
cause the refrigerant system to oper-
ate at higher than normal pressures.
Results will be a higher than normal
evaporator temperature.
Important: there should be adequate
air circulation around the dryer, and
proper ventilation in the equipment
room is a must to achieve a low
enough ambient temperature
Excessive temperature
on crankcase of com-
pressor
Allow time for the com-
pressor to cool down
Reason may be a possi-
ble incorrect adjustment
or shortage of refrigerant
Compressor is protected against too
high a temperature of the crankcase
by a thermal switch called “klixon”
Klixon can be located internally to
refrigerant compressor or under the
protective cover on the top of the
compressor
Excessive compressed
air inlet temperature
Be sure that dryer inlet
conditions are within the
specified range.
The dryer is designed for working
within calculated maximum condi-
tions.
Should these conditions change, the
dryer can be overloaded, the dew
point will go up and protecting devices
can switch off
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