Service Manual

164 Part Number: 000015431 Rev 02 6/20
Diagnostics
FREEZE CYCLE - QUIETQUBE® REMOTE
CONDENSING UNIT
1. Determine if the coil is clean.
2. Determine the air temperature entering the
condenser.
3. Determine if the head pressure is high or low in
relationship to the outside temperature. (Refer to
the proper “Cycle Times/24-Hour Ice Production/
Refrigerant Pressure Charts” on page 183.)
4. Determine the temperature of the liquid line entering
the receiver by feeling it. This line is normally warm;
“body temperature.”
5. Using the information gathered, refer to the chart.
NOTE: A head pressure control valve that will not bypass,
will function properly with condenser air temperatures
of approximately 70°F (21°C) or above. When the
temperature drops below 70°F (21°C), the head pressure
control valve fails to bypass and the ice machine
malfunctions. Lower ambient conditions can be simulated
by rinsing the condenser with cool water during the freeze
cycle.
Condition Probable Cause Corrective
Measure
Discharge Pressure - High
Liquid Line Temperature - Hot
Valve stuck in
bypass
Replace valve
Discharge Pressure - Low
Liquid Line Temperature -
Cold
Valve not
bypassing
Replace valve
Discharge Pressure - Low
Liquid Line Temperature - Hot
Ice Machine
Low on Charge
Refrigerant
Charge
Verification