Dryer Manual

AIR DRYER INSTRUCTION MANUAL
12
TROUBLESHOOTING
Problem Possible Cause Re
p
air Comments
Dryer is switched on,
indicator light is lit but
the refrigerant
compressor does not
turn on. (Continued)
Excessive temperature
on crankcase of
compressor. The hot
gas bypass valve may
be out of adjustment,
faulty valve or low on
refrigerant
Allow time for compressor
to cool. Check hot gas
bypass adjustment and
amount of refrigerant.
Then reset refrigerant high
pressure switch. If system
seems low on refrigerant,
evacuate the refrigerant,
weigh the refrigerant and
add refrigerant as needed.
Clogged condenser
fins or clogged water
condenser.
Clean fins with
compressed air or clean
condenser of all
obstructions.
The clogged fins in the
condenser restrict the air
passage and, causes high
temperatures in the evaporator.
Check & clean air condensers
periodically.
Condenser fan not
running
Check voltage to fan and
check for faulty fan
Possible loss of phase
Have a qualified
electrician, or refrigeration
contractor check phase &
voltage
Possible low voltage
causing overload trip
Have a qualified
electrician or refrigeration
contractor check the circuit
Possible failed
compressor
Check & replace
compressor if necessary
Too much compressed
air flow.
Check actual flow through
the dryer.
The dryer allows for a
maximum air flow at design
conditions. If too much
compressed air goes into the
dryer, system is overloaded,
resulting in water carryover
down-stream in the compressed
air. Check the CFM rated
output for the air compressor.
Faulty electrical wiring Have a qualified electrician
or refrigeration contractor
inspect the circuit
High amp draw has
caused a relay or
breaker to trip.
Reset the high amp
protection.
Dryer is protected against high
amp draw by an overload relay
that can trip if circuit is
overloaded. Reset, but if trips
again, have an electrician or
qualified refrigeration
contractor check the circuit.
Faulty high pressure
switch
Replace switch