What is the primary function of an accumulator?

a. Store refrigerant on TEV systems and systems with HPR valves.
b. Protects the compressor from floodback during hot pull-downs.
c. Keeps head pressure up during low ambient conditions.
d. Allow the system to be pumped down for repairs to the high side of the system.


b. Protects the compressor from floodback during hot pull-downs.

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Match the following methods of light detection with the following applications for which they are most likely used. Methods may be used more than once.

A. detecting a clear object B. detecting an object that does not have a flat surface C. detects an object at a specific distance D. detects an object from a long distance away E. detects and counts small objects at a rapid pace F. G.

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What stops the program when the system is in automatic?

What will be an ideal response?

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What provides the main source of air to the furnace?

A) Damper B) Air register C) Furnace purge D) Stack

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Steel is used for reinforcement because it _____.

a. will not corrode b. has nearly the same temperature expansion and contraction rate as concrete c. has a lower temperature expansion and contraction rate than concrete d. is inexpensive

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