Vogt P18AL TUBE-ICE, Service Manual

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P18AL Service Manual
TROUBLESHOOTING
3/6/07
8-7
Symptom: Machine short cycles (using freeze pressure switch (FPS) only)
Possible Cause Possible Remedy
Freezer pressure switch (FPS) set too low or defective Adjust switch or replace if defective.
Freeze-up See “Freeze-up due to extended freezer period” and “Freeze-
up due to ice failing to discharge”.
Clogged water distributors Clean water distributors.
Lack of water for making ice Check water tank for sufficient water level. Check for
restriction in water line, defective float valve, open drain
valve, excessive ice chips or low water pressure and correct.
Lack of sufficient liquid refrigerant feed Check float and float switch, solenoid valve and coil in liquid
line, strainer, and refrigerant level in receiver.
Water pump rotation incorrect or pump defective Check pump motor rotation. Check for leaking pump seal or
defective motor and repair or replace as needed.
Symptom: High compressor discharge temperature
Possible Cause Possible Remedy
High head pressure Check gage accuracy and “High discharge pressure”.
Defective suction or discharge valves Feel the compressor heads for hot spots or one head running
hot. Replace worn or leaking valves.
Restriction in the discharge gas line Check all hand and check valves to make sure they are fully
opened and not stuck. Repair or replace as needed.
Internal relief valve leaking Check the compressor manual to see if your compressor is so
equipped. Replace accordingly.
Symptom: Suction line frosting to compressor
Possible Cause Possible Remedy
Liquid refrigerant overfeed Check float switch to make sure it is functioning properly.
Replace if defective. Check solenoid valve (25) to make sure
it is not leaking through. Repair or replace if defective.
Refrigerant contaminated with water Test refrigerant or oil for water contamination. Completely
pump the freezer out (pumpdown) and blow excess water out
through the oil trap drain valve. Refer to Service, Section 9
“Removing Excess Water”.