Part Number 80-1505-3 6/11 165
Final Analysis
The column with the highest number of check marks
identifies the refrigeration problem.
COLUMN 1 - HARVEST VALVE LEAKING
A leaking harvest valve must be replaced.
COLUMN 2 - LOW CHARGE OR TXV STARVING
Normally, a starving expansion valve only affects the
freeze cycle pressures, not the harvest cycle
pressures. A low refrigerant charge normally affects
both pressures. Verify the ice machine is not low on
charge before replacing an expansion valve.
1. Do not add charge to remotes. The symptoms of
a remote low on charge will result in a safety limit
#1 or #2 in cool ambient temperatures. Low on
charge symptoms would be a hot liquid line with
normal or below normal head pressure.
2. Find the refrigerant leak. The ice machine must
operate with the nameplate charge. If the leak
cannot be found, proper refrigerant procedures
must still be followed Change the liquid line drier.
Then, evacuate and weigh in the proper charge.
COLUMN 3 - REFRIGERANT OVERCHARGE OR
TXV FLOODING
A loose or improperly mounted expansion valve bulb
causes the expansion valve to flood. Check bulb
mounting, insulation, etc., before changing the valve.
Verify refrigerant amount is correct by weighing
recovered refrigerant before replacing a TXV. On
Quad evaporator machines, the service technician is
able to tell which TXV is flooding by comparing the
evaporator outlets. Change only the flooding
expansion valve.
COLUMN 4 - COMPRESSOR
Replace the compressor and start components. To
receive warranty credit, the compressor ports must be
soldered closed to prevent oil leakage in transit.
NOTE: This table must be used with charts, checklists
and other references to eliminate refrigeration
components not listed on the table and external items
and problems, which can cause good refrigeration
components to appear defective.
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