SECTION 3 PRODUCT USER MANUAL
129
Dryer-on light is lit but
Refrigerant Compressor
does not run.
Clogged condenser fins
or clogged water
condenser.
Possible high crankcase
temperature
Possible loss of phase
Possible low voltage caus-
ing overload trip
Possible failed compres-
sor
Clear fins or water
condenser of all
obstructions.
The clogged fins in the con-
denser will restrict the air pas-
sage and reduce the refrigeration
capacity, causing high tempera-
ture in the evaporator. Same will
occur if water condenser is
clogged with mud or dirt. Air con-
denser and water condenser
should be periodically checked
and cleaned. Protect water circuit
by an adapted filter.
Too much compressed air
flow.
Check actual flow
through the dryer.
This dryer is designed for a maxi-
mum air flow at design condi-
tions. If too much air is pumped
into the dryer, water removal
capacity may not be sufficient,
resulting in liquid carryover down-
stream. Check the rated output
the air compressor.
Faulty electrical wiring Inspect the circuit The compressor-on light should
be wired into the refrigerant
compressor circuit. See wiring
diagram in chapter ??rawings?
of this manual.
One electrical protection
has tripped.
Reset the protection or
replace the blown fuse.
The dryer is protected against
high amp draw by fuse and/or
overload relay that can trip in
case of need. Reset or replace
fuse once, but do not persist if it
trips again, request assistance
from a qualified refrigeration con-
tractor.
Dryer-on light is lit but
fan is not running.
Fan has to run if refriger-
ant high pressure reaches
upper set point.
Check that compressed air
flows through the dryer. Check
that fan blades are free to
move. Check the fan pressure
switch.
Fan operates automatically to
keep refrigerant pressure below
the maximum value. The fan can
stop if pressure is under
the recommended setting.
When compressor starts,
it vibrates a lot and
makes mechanical noise.
Compressor is slugging
liquid refrigerant at start-
up.
Be sure the pre-heating period
of at least4 hours is respected
for dryers equipped with a
crankcase heater.
Refrigerant may move between
receivers when refrigerant com-
pressor is stopped and not
heated, especially if stopped for a
long time. This migration may
cause liquid shock (slugging) in
valves specially on large dryers
containing more refrigerant.
Problem Possible Cause Repair Comments
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