If a thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the evaporator, which of the following could result?
A) The bulb pressure would increase and the thermostatic expansion valve would open.
B) The superheat in the evaporator would decrease.
C) The evaporating pressure and the compressor's suction pressure would increase .
D) All of the above are correct.

Question

Quizplus · Accepted Answer

The thermal bulb senses the temperature of the refrigerant leaving the evaporator. If the bulb comes loose, it will no longer be able to sense the temperature and the thermostatic expansion valve will open too much, causing the evaporating pressure and the compressor's suction pressure to increase. The superheat in the evaporator will also decrease.

If a Thermostatic Expansion Valve's Thermal Bulb Came Loose from the Suction