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Complaints
Inside of air
dryer has been
frozen
Air leaks from
drain valve
Excessively
low pressure
of main tank
Cause
Misattached dryer body or exposed to cold
weather at ˎ30°C while traveling
Heater has been short–circuited and no heat-
ing
Thermostat has been short, resulting in failure
of heater.
The dryers temperature drops significantly due
to ice or snow stuck to its body
No operation of heater due to disconnection of
the electrical wiring for heater or thermostat
Poor contact of valve seat due to the entry of
foreign substances into valve
When the check valve of main tank fails to per-
form backward flow checking operation with
compressor in unload cycle, air can be leaked
through the main tank drain.
Correction
Correct the position of dryer body or install a wind screen.
1. Use a tester to check the heater for short–circuit.
2. If heater has been short out, change it with a new
one.
Leave thermostat at temperature of 0°C or below and
use a tester to check it. Add heat to thermostat by hand
to check for OFF state and change it if requied.
Remove ice or snow so carefully as not to cause dam-
age to dryer body and electrical wiring connections for
heater.
Check heater and thermostat for connection.
Disassemble and check the valve, and change the valve
kit if required. When damage is found at the wet mov-
ing part of valve body, change the valve.
Disassemble and check the check valve located between
main tank and purge tank, and change it if required.
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