VOGT ICE TUBE-ICE P-24A, Service Manual

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P24A & P34A Service Manual
TROUBLESHOOTING
12/17/12
8-4
Symptom: Freeze-up due to extended freeze period
Possible Cause Possible Remedy
Freezer pressure switch (2PS) set too low or
defective Adjust switch or replace if defective. See
FIGURE 9-1.
Water tank drain valve, make-up water float
valve or flushing valve stuck or opened 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.
Thaw gas solenoid valve (18) leaking through
during freeze 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.
Compressor running unloaded 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.