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This pressure reading is taken at the high side of the condensing unit and will range from 100-200 Psi. This pressure is commonly known as "High Side Pressure". Using a calibrated manifold, this pressure is taken at the liquid line service valve.

This reading is pressure converted to temperature. This reading is provided from the R134a Pressure Temperature Conversion Chart. Example: 216.3 Psi =136˚FThis pressure is commonly known as "High Side Pressure". Using a calibrated manifold, this pressure is taken at the liquid line service valve.

This measurement is the actual temperature of the copper line at the liquid line king valve. Using a calibrated thermometer tightly secure the sensor with electrical tape to ensure solid contact to the surface of the copper line. Insulate the sensor to ensure there is no temperature influence from the condenser exhaust air. This will ensure you are reading the correct copper line temperature and not the surrounding air temperature.

The subcooling calculation is the head pressure converted to temperature subtracted from the liquid line temperature. Equation - head pressure converted to temperature subtracted from the liquid line temperature. CellarCool cooling units achieve optimum performance with a 5˚F subcooling at an ambient of 85˚F.

This is the pressure reading taken at the low side of the condensing unit and will range from 24-50 Psi. This pressure reading is commonly known as "Low Side Pressure". Using a calibrated manifold, this pressure is taken at the Suction service valve.

This reading is pressure converted to temperature. This reading is provided from the R134a PT Conversion Chart. Example: 30.4 Psi = 35˚F

This measurement is the actual temperature of the copper line at the suction line service valve.

The superheat calculation is the temperature of the suction line subtracted from the suction pressure converted to temperature. Equation - the temperature of the suction line subtracted from the suction pressure converted to temperature. (k-j = l)

The temperature difference between return air temperature and supply air temperature of the evaporator cooling unit is commonly known as "Delta". Equation: Return Air subtracted from Supply Air. (a-b = Delta T) Using a calibrated thermometer, place the sensor in the center of the coil, or return grille 1 inch from touching any surface.

Using a calibrated amp meter, clamp the meter onto the "hot wire". This will be the black wire in the electrical box. Amps must not exceed manufacturing rating on the name plate.

Amount of refrigerant added to the system, measured by scale.