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A hot gas valve is installed behind the expansion valve of the low side of gas line and is used during defrost conditions heating of liquid before it again enters the evaporator.
When diminishingloads force a refrigeration system tooperate at unstable conditions,compressor and evaporator capacitiesbalance at ever lower suction pressuresand temperatures. Unchecked, theeventual result is coil frosting andcompressor flooding
to prevent condensate from freezing on the surface of the evaporator coil when the system is operating at extremely low load conditions.
Hot Gas Bypass is a control system that is used must be able to keep the engine operating at the level of the most economical to regulate consumption of energy used at the time adapted to the needs of the load. E.g. consumption of water, fuel or electricity consumed at the time of air conditioning load drops below its nominal design. For the compressor must be equipped with a capacity control system for example by using a tool called: Hot Gas Bypass, Auto Unloader and multispeed compressors or compressor parallel.
Control system using control devices called Hot Gas Bypass Valve. In this system, a bypass valve installed between the high pressure side compressor (discharge line) and the low pressure side (suction line). This valve set will open its valve when the difference between the high pressure and low pressure has reached a certain price point suitable valve arrangement of its (setting). Valve opens when the pressure reached a low point evaporation dangerous, and will close when the suction pressure has gone up back at the price of safety. In this system, to reduce the capacity of the compressor, hot gas from the compressor directly channeled into the evaporator through a bypass channel controlled by solenoid stop valve and modulating hot gas bypass valve.
