Practice test

HVAC Practice Exam 17

Expert HVAC practice exam 17: low-pressure chiller service, charge-by-subcooling, enthalpy capacity checks, and gas pressure and defrost troubleshooting.

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Question 1

1

A chiller operator must add R-123 to a low-pressure machine that runs in a vacuum. The biggest risk during charging is:

Question 2

2

The purge unit on a low-pressure chiller exists primarily to:

Question 3

3

An owner of a 55-pound comfort-cooling unit fails to repair a 15 percent leak within 30 days and files no retrofit plan. This is:

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