Dryer Manual

AIR DRYER INSTRUCTION MANUAL
18
TROUBLESHOOTING
Problem Possible Cause Re
p
air Comments
The unit stops running
during operation or
cycles off and on.
Excessive compressed
air inlet temperature.
Design conditions and
correction factors are
described in this manual.
Be sure that dryer is
working in ambient
temperatures below
design conditions.
The dryer is designed for
working into calculated
design conditions, and if
those conditions are
exceeded, the dryer will be
overworked, dew point goes
up and protecting devices
may trip.
High ambient
temperature
Designed conditions are
described in dryer data
plate. Be sure that dryer is
working lower than design
conditions.
A high ambient temperature
may cause the refrigerant
system to operate at higher
than normal pressures, and
results in a higher than
normal evaporator
temperature. Important:
Adequate air circulation
around the dryer, and proper
ventilation in the equipment
room should guarantee a low
enough ambient
temperature.
Clogged condenser fins Clear fins of all
obstructions.
Clogged fins in the con-
denser restricts the air pas-
sage and reduces the
refrigeration capacity,
causing high temperatures in
the evaporator. Check &
clean fins periodically.
Shortage of refrigerant
Fix the leak, if necessary
and add a charge of
refrigerant.
Loss of refrigerant causes
improper functioning. Dryers
are equipped with a
temperature switch to
regulate the amount of
refrigerant to maintain proper
cooling of the compressor. A
shortage of refrigerant causes
suction lines to become very
hot, causing the temperature
switch to trip. Have a
qualified refrigeration
technician make all the
repairs or contact factory if
unit is in warranty
Green start indicator light
won’t stay on when pressed
and compressor won’t start.
Shortage of refrigerant
Fix the leak, if necessary
and add a charge of
refrigerant.