When radiation comes in contact with or is absorbed by matter, that material is said to be radioactive.

RTUs with hot water systems usually use a nonfreezing solution composed of water and _____ in the piping.

A common time when a compressor’s cylinders are unloaded is _____.

If a low pressure pushing against the bellows of a pressure water valve began to increase, the valve should _____.

The capacity of screw compressors is controlled with _____.

Cooling tower water that is intentionally drained to reduce mineral concentrations is called _____.

Purge units are designed to remove noncondensables from a(n) _____.

The purpose of a compression chiller economizer is to improve system efficiency by _____.

Cylinder unloading is used on _____ compressors.

When an air-side economizer takes control of a system, the _____.