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Author Question: In Figure 39-34, what is the difference between emergency heat operation and normal second stage ... (Read 38 times)

nevelica

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on: Jul 26, 2018
In Figure 39-34, what is the difference between emergency heat operation and normal second stage heat operation?
 
  What will be an ideal response?

Question 2

List the associations that establish national standards for the HVACR industry.
 
  What will be an ideal response?


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dreamfighter72

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Reply #1 on: Jul 26, 2018
Answer to Question 1

The heat strips are the first stage heat in emergency heat and the compressor does not operate. When they are the second stage in normal operation, they are energized in addition to the compressor.

Answer to Question 2

ARI - Air Conditioning and Refrigeration Institute
ASHRAE American Society of Heating Refrigeration and Air Conditioning
Engineers
ASME - American Society of Mechanical Engineers
UL - Underwriters Laboratories
NFPA - National Fire Protection Association


nevelica

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Reply 2 on: Jul 26, 2018
Thanks for the timely response, appreciate it

xiaomengxian

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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