Manitowoc

Hot Gas Valve AnalysisThe valve can fail in two positions:• Valve will not open in the harvest cycle.• Valve remains open during the freeze cycle.Valve Will Not Open in the Harvest CycleAlthough the circuit board has initiated a harvest cycle,the evaporator temperature remains unchanged fromthe freeze cycle.Valve Remains Open in the Freeze CycleSymptoms are dependent on the amount of leakage inthe freeze cycle. A small amount of leakage will causeincreased freeze cycle times. A large amount ofleakage will result in no ice produced.Use the following procedure and table to helpdetermine if a hot gas valve is remaining partially openduring the freeze cycle.1. Wait five minutes into the freeze cycle.2. Feel the inlet of the hot gas valve(s).ImportantFeeling the hot gas valve outlet or across the hotgas valve itself will not work for this comp arison.The h ot g as val ve o utlet i s on the suction sid e(cool refrigerant). It may be cool enough to toucheven if the valve is leaking.3. Feel the compressor discharge line.! WarningThe inlet of the hot gas valve and the compressordischarge line could be hot enough to burn yourhand. Just touch them momentarily.4. Compare the temperature of the inlet of the hotgas valves to the temperature of the compressordischarge line.Part Number 80-01111-9 7/10 155