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DIAGNOSING WATER-COOLED CONDENSING
UNIT HEADMASTER VALVE
Freeze Cycle
The water regulating valve maintains the freeze cycle
discharge pressure. Refer to water regulating valve
diagnostics.
Harvest Cycle
The headmaster control valve diverts the compressor
discharge gas to the ice machine receiver in the
harvest cycle. All refrigerant flow through the
condenser in the harvest cycle stops. Symptoms of a
headmaster valve that will not seat 100% closed in the
harvest cycle (completely bypass the condenser) are:
Freeze cycle suction and discharge pressure are
normal.
The control board indicates safety limit #2.
Harvest cycle suction pressure is low.
Harvest cycle discharge pressure is normal or high
(water regulating valve attempts to maintain 240
psig)
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