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Author Question: Why should the vacuum pump isolation valve be closed before turning off the vacuum pump? What ... (Read 66 times)

bb

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on: Jul 26, 2018
Why should the vacuum pump isolation valve be closed before turning off the vacuum pump?
 
  What will be an ideal response?

Question 2

How does an overcharge of refrigerant affect system efficiency?
 
  What will be an ideal response?


Sammyo

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

The vacuum in the system can suck the oil in the pump out of the pump and into the hoses, vacuum gauge, or even the system if left long enough.

Answer to Question 2

Overcharging will cause liquid refrigerant to back up in the condenser, increasing the operating head pressure and reducing system efficiency


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