96 Part Number STH063 9/17
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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