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Which of the following represents the lowest vacuum?

A pressure of 100 microns has been reached with the vacuum pump operating. The pump is turned off and the gauge reading rises above 5,000 microns and keeps rising. What does this indicate?

A micron gauge is used to measure ____.

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

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.

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

Why is refrigerant not used for a system standing pressure test?

EPA regulations require that leak commercial and industrial process refrigeration be repaired when the leak rate exceeds percent of the charge per year.

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

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