How to check superheat and subcooling with different angle
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A low airflow or dirty evaporator can raise subcooling. (if the unit has a fixed orifice metering device, use the total superheat charging method.) To calculate subcooling properly, you must use liquid pressure, not discharge pressure.
To determine which one, view the indoor unit rating plate to.
A dirty condenser can lower subcooling. Negative subcooling isn't possible if the liquid line temperature and pressure are taken at the same point. Use the dew point temperature on the pressure/temperature chart to obtain the evaporator saturation temperature for superheat, and the bubble point temperature to obtain the condenser saturation temperature to measure subcooling. As a review, superheat is heat added to the refrigerant above its boiling point/saturation.
