Part Number 80-1505-3 6/11 207
HEADMASTER CONTROL VALVE
Function
The headmaster control valve maintains the correct
discharge pressure and liquid line temperature in the
Freeze and Harvest cycles
.
Manitowoc QuietQube
®
systems require headmaster
control valves with special settings. Replace defective
headmaster control valves only with “original”
Manitowoc replacement parts.
Freeze Cycle Operation
During low ambient conditions, it is normal for the
head pressure control valve to hunt (head pressure
may fluctuate up and down) on CVD condensing units.
Hunting varies by model and ambient, but generally
settles out within the first 6 minutes of the freeze cycle.
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 starts to modulate (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.
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