Part Number STH025 11/16 199
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
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