« previous next »

Author Question: In Figure 39-34, what happens when the defrost relay DR is energized? What will be an ideal ... (Read 192 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?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Did you know?

In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

Did you know?

Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

front muscle figure front muscle figure
Caravaneer on a camel, China. Tang dynasty, (618–907). Polychrome terra-cotta figure. Caravaneer on a camel, China. Tang dynasty, (618–907). Polychrome terra-cotta figure.
Cultures Ideal Body Types Cultures Ideal Body Types
A schematic of a typical glow plug circuit. Notice that the relay for the glow plug and intake air ... A schematic of a typical glow plug circuit. Notice that the relay for the glow plug and intake air ...
The vehicle’s fuel pump is disabled by removing its relay or fuse. In some cases, it may be ... The vehicle’s fuel pump is disabled by removing its relay or fuse. In some cases, it may be ...
Figure of a Woman with a Drawing Showing Evidence of Original Painting and Outlining Design Scheme Figure of a Woman with a Drawing Showing Evidence of Original Painting and Outlining Design Scheme
Video: Semidiscontinuous DNA replication

For a complete list of videos, visit our video library