TROUBLESHOOTING SECTION 7
154
The unit will not run 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. Should the
conditions be exceeded, the
dryer will be overflowed, dew
point will go up and protecting
devices may trip.
Excessive ambient
temperature
Designed conditions and
correction factors are
described in dryer. 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. Results will
be a higher than normal
evaporator temperature.
Important: there should be
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
The clogged fins in the
condenser will restrict the air
passage and reduce the
refrigeration capacity, causing
high temperature in the
evaporator. Fins should be
periodically checked and
cleaned.
Shortage of refrigerant Fix the leak and add a
charge of refrigerant.
Loss of refrigerant will cause
improper functioning. 3-phase
dryers are equipped with a
temperature switch which
maintains the amount of
refrigerant to maintain proper
cooling of the compressor. A
shortage of refrigerant may
cause suction line to become
very hot, causing the
temperature switch to trip. A
qualified refrigeration specialist
should perform the necessary
repairs, or the factory should be
contacted if the unit is in
warranty.
Err sign occurs on digital
temperature control
device
The dew point is too low
or too high.
Check refrigerant gas and
make sure that the
working conditions are
within the correct range.
If there is not enough refrigerant
gas or if the working
temperature and inlet
temperatures are very high, the
dew point will increase.
PROBLEM
POSSIBLE CAUSE REPAIR COMMENTS
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