Exam 8: Leak Detection, System Evacuation and System Clean-Up

Why is it a good idea to remove Schrader stems from service valves prior to evacuation?

Explain why triple evacuations are not normally performed on large systems.

Why is nitrogen considered a "noncondensable" gas?

When moisture is present in a refrigeration system, it will react with the refrigerant and the oil to form ____.

While under a deep vacuum, any liquid water under the oil in the motor-compressor assembly can be removed by operating the compressor motor for several seconds without any adverse effect on the system.

Noncondensable gases ____.

Why must all valves be opened when an evacuation is performed?

A compound gauge ____.

Micron gauge displays can be electronic analog, digital, or  ____________________.

To pull a vacuum means to ____.

Sludge is produced when moisture, acid, and ____________________ are present in the system.

A micron gauge is used to measure ____.

A deep vacuum involves reducing the pressure in a refrigeration system to a micron gauge reading of ____________________ or below.