The correct amount of superheat is critical to proper unit operation. The units superheat should be its label or in the installation instructions. If the unit has a fixed metering device and no manufactures recommended superheat exists charge the unit to 15º of superheat as a default.
Superheat is simply the refrigerant gas temperature above the refrigerants saturation point. To check superheat compare your actual refrigerant line temperature returning to the compressor (use a accurate thermocouple type or digital thermometer) to your refrigerants saturation point
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