Semi-hermetic compressors on large commercial AC units use ...

[leo leo]

Semi-hermetic compressors on large commercial AC units use ________ to stage the compressor by cutting out individual cylinders in response to load changes.
 
  A) Unloaders B) King valves
  C) Automatic expansion valves D) TXV valves

Question 2

There are no check valves or extra metering devices on most water-source packaged units because
 
  A) most water-source packaged units use suction line accumulators and charge compensators.
  B) its heat exchangers are most often made of copper, cupronickel, or stainless steel.
  C) water-source packaged units have a much lower operating temperature range than air-source units.
  D) most water-source packaged units use a single bi-flow thermostatic expansion valve.

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Answer to Question 1

A

Answer to Question 2

D

[leo leo]

Thanks for the timely response, appreciate it

[Jossy]

Gracias!