Manitowoc Ice STH003 manual HOT GAS Valve, General, Normal Operation

HOT GAS VALVE

General

The hot gas valve is an electrically operated valve that opens when energized, and closes when de-energized.

Normal Operation

The valve is de-energized (closed) during the freeze cycle and energized (open) during the harvest cycle. The valve is positioned between the receiver and the evaporator and performs two functions:

1.Prevents refrigerant from entering the evaporator during the freeze cycle.

The hot gas valve is not used during the freeze cycle. The hot gas valve is de-energized (closed) preventing refrigerant flow from the receiver into the evaporator.

2.Allows refrigerant vapor to enter the evaporator in the harvest cycle.

During the harvest cycle, the hot gas valve is energized (open) allowing refrigerant gas from the discharge line of the compressor to flow into the evaporator. The heat is absorbed by the evaporator and allows release of the ice slab.

Exact pressures vary according to ambient temperature. Harvest pressures can be found in the “Cycle Time/24 Hour Ice Production/ Refrigerant Pressure Charts in this book.

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