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

Correct Answer: Option B — 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.

Evaporator superheat is calculated by reading the low-side suction pressure, converting it to its corresponding saturation temperature via refrigerant tables, and subtracting that saturation temperature from the actual thermometer reading measured directly at the TXV sensing bulb.