Dryer Manual

AIR DRYER INSTRUCTION MANUAL
11
TROUBLESHOOTING
Problem Possible Cause Re
p
air Comments
Dryer is switched
on, indicator light is
lit but the refrigerant
compressor does not
turn on.
3-phase dryers: The
connection has
inverted phases
Invert two phases
3-phase dryers are equipped
with a phase controller to avoid
the fans from turning in the
opposite direction
Refrigeration unit is
not functioning
Check amount of
refrigeration in
compressor
Several factors can cause
compressor failure. A qualified
refrigeration technician needs
to check all the electrical and
refrigerant circuit and controls.
The refrigerant high
pressure protection has
tripped
1-phase dryer:
Units vary. Some
1 phase models are
manual reset, some
reset automatically.
If unit is manual
reset, wait 20
minutes for dryer
to cool and then
press the reset on
the switch (check
for switch in
electrical panel on
door)
3-phase dryer:
Wait 20 minutes
for dryer to cool
and then press the
reset on the switch
(check for switch
in electrical panel
on door)
The dryer is protected against
excessively high refrigerant
pressure. If the condenser
efficiency has been reduced,
the switch will trip on 100
CFM units and under. See
arrow in photo below.
For units over 100 CFM check
the high pressure switch.
High ambient
temperature
It is recommended
that dryer is
working in
temperatures lower
than 105°F (40°C)
A high ambient temperature
may cause the refrigerant
system to operate at higher
than normal pressures, and
results in higher than normal
evaporator temperature.