CARRIER CARRIER CENTRAL AIR CONDITIONER Hissing After Shutdown
System Nominal
The hissing sound is the result of refrigerant pressure equalization between the high-pressure condenser side and the low-pressure evaporator side of the system. Once the compressor stops pumping, the pressure differential naturally balances out by flowing through the expansion valve or capillary tube. This is a standard thermodynamic process necessary to prevent 'hard starting' the compressor on the subsequent cooling cycle.
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