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172 Part Number: 000015430 Rev 02 5/20
Freeze Cycle Operation All Remote Condenser Models
The headmaster is non adjustable.
At ambient temperatures of approximately 70°F (21°C)
or above, refrigerant flows through the valve from the
condenser to the receiver inlet. At temperatures below
this (or at higher temperatures if it is raining), the head
pressure control dome’s nitrogen charge closes the
condenser port and opens the bypass port from the
compressor discharge line.
In this modulating mode, the valve maintains minimum
head pressure by building up liquid in the condenser and
bypassing discharge gas directly to the receiver.
Harvest Cycle Operation
Remote Condenser Models
Refrigerant flows from the compressor to the evaporator
through the harvest valve and the head pressure valve is
out of the circuit.
Diagnostics
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” ).
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.
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