Although it is no longer used in the manufacturing of new air conditioning systems, the number of existing systems using __________ is large, so technicians will be encountering this refrigerant for many years to come.
A) R-22
B) R-12
C) R-410A
D) R-134a

Question

Quizplus · Accepted Answer

R-22 was commonly used in air conditioning systems before it was phased out due to its negative impact on the environment. However, since many existing systems still use R-22, technicians will continue to encounter it for years to come.

Although It Is No Longer Used in the Manufacturing of New