Only two substances should be in the refrigeration system for proper operation. They are ____________________ and oil.

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

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

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

The maximum recommended pressure for leak testing is 150 psig on the low-pressure side of the system.

A(n) ____________________ pressure could also mean refrigerant vapor is still seeping from the refrigeration system.

There are ____________________ microns in 1 mm Hg.

A hydrostatic tube test kit will;

On low pressure chillers, moisture most frequently enters the refrigerant system through;

When it is essential to take measures to help release trapped refrigerant from the compressor oil during refrigerant recovery;