Specifications

24
Compressed air
temperature to
refrigeration dryer
too low.
The inlet compressed air temperature must be
higher than 40° F. If compressed air temperature
is lower than 40° F, turn refrigerated air dryer
off. Air may pass through the dryer under this
condition, once the compressed air temperature
has increased to 44° F the dryer must be turned
back on to avoid a high refrigerant pressure
situation or isolate the dryer from the compressed
air stream.
Problem Probable Cause Remedy
Highrefrigerantsuction
pressure, suction gauge
reading out of range and
water downstream of
refrigeration dryer.
Refrigerationcircuit 
hot gas bypass valve
out of adjustment or
defective.
Contact an authorized service technician.
Refrigerationexpansion
valveorTXVadjustment
fitting out of adjustment.
Contact an authorized service technician.
Low refrigerant suction
pressure, suction gauge
reading out of range and/
or refrigeration compressor
covered with ice.
Refrigerationcircuithot
gas bypass valve out of
adjustment or defective.
Contact an authorized service technician.
Refrigerationexpansion
valveorTXVadjustment
fitting out of adjustment
and is not feeding enough
refrigerant to the evaporator.
Contact an authorized service technician.
Excessivepressuredrop
on the high side of the
refrigeration circuit.
Check for a plugged in line filter dryer or receiver
on the refrigeration circuit that could be causing
these restrictions.
Compressor oil
downstream of
refrigerated air dryer.
Check optional prefilter
condensate drain for
failure.
Dismantleprefilterdrainandcleanorreplace.
Failed or plugged
prefilter element.
Check optional prefilter and replace element.
Air compressor injecting
too much oil into the
airstream.
Check air compressor for oil leak into the air
stream, check air oil separator element for
failure.
AircelDHTSeries-Models20-125