The oil in a vacuum pump should be changed after each time it is used.

The best method of leak checking is when the refrigeration system is ____.

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.

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

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

After repairing a system that has had an electrical motor failure (compressor burnout), it is good field practice to re-use the recovered refrigerant in that system.

There are ____________________ microns in 1 mm Hg.

When installing any type of access fitting onto a sealed system;

A hydrostatic tube test kit will;

Recovery equipment used during maintenance service, or repair of small appliances must be certified by an EPA approved lab if manufactured after;