Vogt P-24AL, Руководство по обслуживанию

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P24AL & P34AL Service Manual
TROUBLESHOOTING
12/2016
8-7
Symptom: Low ice capacity (cont.)
Possible Cause Possible Remedy
Excessively high head pressure Check cooling tower or evaporative condenser
to make sure sufficient water is provided for
cooling and the equipment is operational to
cool the water. Also see “Symptom High Head
Pressure”.
Suction regulator out of adjustment or
defective (optional) Check the freezer pressure and compare to the
main suction pressure. The suction regulator
should regulate the freezer pressure and create
a 2 psig pressure drop across the valve. Adjust
pressure regulator. Repair or replace defective
valve.
Thawing gas solenoid valve (18) leaking
through during freeze cycle Check the manual opening stem to make sure it
is in the automatic position (stem screwed in).
Check for leak by sound, temperature
difference and frost during a freeze cycle.
Close the stop valve (90) to confirm suspicion
of leakage. Repair or replace the valve.
Symptom: Poor ice quality
Possible Cause Possible Remedy
Excessive concentration of solids in the water
tank usually indicated by a build-up of mineral
deposit on the sides and bottom of the tank and
opaque ice production. Also, water distributors
restricted. Perform a cleaning procedure as well as
removing the freezer cover and cleaning the
water distributors. Make sure the flushing
valve (63) is functioning and the tank overflow
piping is not restricted.
Insufficient water supply indicated by a low
level in the tank Check water pressure, 40 psig is recommended
minimum. Check for a water line restriction,
partially closed valve, or defective make-up
water float valve. Make sure the water tank
drain is closed.
Water pump rotation wrong direction Check rotation in relation with arrow on pump
housing and reverse two wires at the motor if
necessary.
Low refrigerant charge, causing an ice out
problem and re-freeze Check refrigerant level mark on the receiver
and on the painted portion of the gage glass
guard. Be sure to keep the gage glass cocks
closed when finished checking the level.
Suction Pressure to low Adjust suction regulator valve
Restriction in liquid line, causing short freeze
cycle Check for closed valve, defective solenoid
valve (20), float switch defective or strainer
restricted. The liquid line will normally have
frost on the down-stream side of a restriction,
especially as the suction pressure decreases.