Which of the listed statements describes the method used to determine the amount of superheat present in the suction gas leaving the evaporator coil? See Illustration GS-RA-16

Correct Answer: Option D — Note the low side pressure, determine the corresponding saturation temperature, and subtract it from the temperature measured with a thermometer at the thermostatic expansion valve sensing bulb.

Superheat is calculated by reading the low-side evaporator pressure, converting it to its saturation temperature using a refrigerant pressure-temperature chart, and subtracting that value from the actual bulb temperature.