To use the electronic leak detector, the system must contain at least some refrigerant. If the system is operating with a small leak, plenty of pressurized refrigerant is left in the system. But if the system is void of refrigerant, it must first be pressurized with __________, to which a trace of refrigerant has been added.
A) halogen
B) hydrogen
C) nitrogen
D) oxygen

Question

Quizplus · Accepted Answer

The most commonly used pressurizing gas for leak detection is nitrogen, to which a trace amount of refrigerant is added to make it detectable with the electronic leak detector. Halogen and hydrogen are not used as pressurizing gases, and oxygen is not recommended due to its potential for combustion.

To Use the Electronic Leak Detector, the System Must Contain