Vogt P-24AL, Руководство по обслуживанию

Страница: 83 / 149

P24AL & P34AL Service Manual
TROUBLESHOOTING
12/2016
8-11
Symptom: Machine short cycles (using freeze pressure switch (2PS) only)
Possible Cause Possible Remedy
Freezer pressure switch (2PS) set too low or
defective Adjust switch or replace if defective. See
Figure 9-3.
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 restrictions in water line, defective
float valve, and 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 #20 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 #20 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 #61. Refer to Chapter 9
“Removing Excess Water”.