« previous next »

Author Question: In Figure 39-34, what happens when the defrost relay DR is energized? What will be an ideal ... (Read 188 times)

fox

  • Hero Member
  • *****
  • Posts: 540
on: Jul 26, 2018
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
Reply #1 on: Jul 26, 2018
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

fox

  • Hero Member
  • *****
  • Posts: 540
Reply #2 on: Jul 26, 2018
Thank you!


duke02

  • Sr. Member
  • ****
  • Posts: 312
Reply #3 on: Jul 26, 2018
Always glad to help...


« previous next »
 

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

Did you know?

Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

Demonstrate the Application of Triangular, Figure-Eight, and Tubular Bandages Demonstrate the Application of Triangular, Figure-Eight, and Tubular Bandages
A typical output driver. In this case, the PCM applies voltage to the fuel pump relay coil to ... A typical output driver. In this case, the PCM applies voltage to the fuel pump relay coil to ...
Connect the leads of the meter to contacts 30 and 87 of the relay socket. The reading of 4.7 ... Connect the leads of the meter to contacts 30 and 87 of the relay socket. The reading of 4.7 ...
Three pathways of complement combined. (a) Figure shows a summary of how each pathway proceeds. (b) ... Three pathways of complement combined. (a) Figure shows a summary of how each pathway proceeds. (b) ...
The figure shows an LR circuit with a switch and a 240-volt battery. At the instant the switch ... The figure shows an LR circuit with a switch and a 240-volt battery. At the instant the switch ...
The cube of insulating material shown in the figure has one corner at the origin. Each side of ... The cube of insulating material shown in the figure has one corner at the origin. Each side of ...
Video: Apicomplexan life cycle Animation

For a complete list of videos, visit our video library