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8-4
TROUBLESHOOTING
Symptom:
Freeze-up due to extended freeze period
Freezer pressure switch (2PS) set too low or
defective
Water tank drain valve, make-up water float
valve or flushing valve stuck or opened
Thaw gas solenoid valve (18) leaking through
during freeze
Compressor running unloaded
12/17/12
Possible Cause
Possible Remedy
Adjust switch or replace if defective.
FIGURE 9-1.
Close, repair, or replace valve as needed. The
float valve should be adjusted low enough that
water should not run out the tank overflow
during the freeze cycle.
Check the manual opening stem to make sure it
is in the automatic position (stem screwed in).
Check for leakage by sound, temperature
difference and frost during the freeze cycle.
Leakage should stop by closing the hand stop
valve downstream of thaw gas valve. Isolate
and repair or replace the valve as needed.
If the compressor is running unloaded, the
motor amp draw will only be 60%-70% of the
normal amp draw of a loaded compressor.
Check the delay timer (DT) electrical circuit to
make sure the "UR-SOL" coil is not energized.
Refer to the compressor manual for normal oil
pressure needed to load the compressor
cylinders and any further procedures to check
the mechanical function of the unloader
mechanism.
P24A & P34A Service Manual
See
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