Part Number STH025 8/12 197
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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