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Author Question: In Figure 39-34, what is the difference between emergency heat operation and normal second stage ... (Read 35 times)

nevelica

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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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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
Great answer, keep it coming :)


abro1885

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Reply 3 on: Yesterday
Wow, this really help

 

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