Author Question: The preferred method for raising the pressure of a low-pressure chiller in order to test for leaks ... (Read 107 times)

silviawilliams41 · **on:** Jul 24, 2018

The preferred method for raising the pressure of a low-pressure chiller in order to test for leaks is:

A) Charging the chiller with R-410A. B) Adding nitrogen to the evaporator.
C) Circulating warm water through the chiller. D) Adding more refrigerant.

Question 2

Why is evacuating a refrigeration system important?

A) Evacuation is the only procedure to ensure that noncondensable gases and moisture are removed from HFC systems with a POE lubricant.
B) Increases in the system high-side pressure and temperature can only be accomplished by proper evacuation.
C) Evacuation increases the system head pressure and compression ratio.
D) Noncondensable gases and moisture, the two most common system contaminants, can be removed through evacuation.