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Author Question: In Figure 39-45, what does the LPS control? What will be an ideal ... (Read 52 times)

xclash

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on: Jul 26, 2018
In Figure 39-45, what does the LPS control?
 
  What will be an ideal response?

Question 2

In Figure 39-46, list the sequence of events that occur when the cooling relay is energized.
 
  What will be an ideal response?


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smrtceo

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

It is in series with the contactor coil C. When the pressure drops below its set point it breaks the circuit to the contactor coil, turning off the compressor.

Answer to Question 2

The NO cooling relay contacts on line 14 close to energize the outdoor fan contactor.
The outdoor fan contactor NO contacts on line 5 close to energize outdoor fan motor 1.
The outdoor fan contactor NO contacts on line 8 close. If the high pressure control closes, outdoor fan motor 2 will energize.
The NO cooling relay contacts on line 12 close to energize the compressor contactor.
The compressor contactor closes to energize the compressor.


xclash

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

emsimon14

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Reply 3 on: Yesterday
Excellent

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