Author Question: In Figure 39-34, what happens when the defrost relay DR is energized? What will be an ideal ... (Read 197 times)

fox

  • Hero Member
  • *****
  • Posts: 540
In Figure 39-34, what happens when the defrost relay DR is energized?
 
  What will be an ideal response?

Question 2

Explain a method used to determine if noncondensables are in a refrigeration system.
 
  What will be an ideal response?



duke02

  • Sr. Member
  • ****
  • Posts: 312
Answer to Question 1

DR NO contacts energize the RVS to put the unit into cooling mode. Another DR NO contact energizes the HS1 coil to bring on the strip heat. The DR NC contacts break the circuit to the outdoor fan motor, turning it off.

Answer to Question 2

The method used is as follows:
Determine the type of refrigerant in the system.
Electrically disable the compressor and allow the condenser fan to operate. Attach a temperature probe to both the discharge line and liquid line. Place a third temperature probe to measure the temperature of the air entering the condenser.
Connect a pressure gauge on the system to measure the pressure of the refrigerant in the condenser.
When all three temperature probes



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

duke02

  • Sr. Member
  • ****
  • Posts: 312

 

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

Did you know?

Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Did you know?

As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

For a complete list of videos, visit our video library