How to check superheat on heat pump with no doubt
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Visually inspect the system, especially the cleanliness of coils, filters, blower wheels, etc. What to use to check charge: You will plug these into the chart or calculator, and you will get a target superheat generally somewhere between 5 and 25 degrees.
It is important to note that the proper refrigerant charge is necessary in any air conditioner or heat pump to work efficiently.
Take a pressure reading of the suction line at the evaporator to get refrigerant saturation pressure=temperature. Visually inspect the system, especially the cleanliness of coils, filters, blower wheels, etc. Manufactures will set airflow around 350 cmf per ton at 0.50” total static and some models are even lower. Check all capillary tube units and piston metering device type systems for charge using the suction superheat method.
