Manitowoc UG Series, Technician'S Handbook

Page: 78 / 128

78 Part Number: 040006847 12/19
VALVE REMAINS OPEN IN THE FREEZE CYCLE:
Symptoms of a hot gas valve remaining partially open
during the freeze cycle can be similar to symptoms of an
expansion valve, capillary tube or compressor problem.
Symptoms are dependent on the amount of leakage in the
freeze cycle.
A small amount of leakage will cause increased freeze
times and the ice formation pattern on the top of the
evaporator will be too thin, but a complete ice cube will
eventually form.
Refer to the Parts Manual for proper valve application.
If replacement is necessary, use only “original” Welbilt
replacement solenoid valves.
Use the following procedure to help determine if a harvest
valve is remaining partially open during the freeze cycle:
1. Wait 5 minutes into the freeze cycle.
2. Feel the inlet of the hot gas valve.
Important
Feeling the hot gas valve outlet or across the hot gas
valve itself will not work for this comparison. The hot
gas valve outlet is on the suction side (cool refrigerant).
It may be cool enough to touch even if the valve is
leaking.
3. Feel the compressor discharge line.