This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: List the operational sequence for Figure 39-24. What will be an ideal ... (Read 211 times)

elizabeth18

  • Hero Member
  • *****
  • Posts: 559
on: Jul 26, 2018
List the operational sequence for Figure 39-24.
 
  What will be an ideal response?

Question 2

List the heating operational sequence for the unit in Figure 39-25.
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

aprice35067

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jul 26, 2018
Answer to Question 1

With the system switch in the heat position, the heating thermostat closes when the room temperature drops. This initiates a call for heat, creating a path from the Red side of the transformer to the W terminal on the thermostat, through the limit and roll out switches to the ignition control on line 14. The ignition control energizes the draft fan relay coil (DRF line 14), closing the DFR contacts, which energize the draft fan motor (DFM line 3). The draft fan motor operates for 60 seconds Operation of the draft fan motor causes the draft pressure switch (DPS) to close line 13. The ignition control energizes the ignition relay coil (IR line 16), closing its contacts and energizing the igniter, line 1. The igniter is energized for 60 seconds before the gas valve is energized. The gas valve is energized and the flame rectification circuit looks for the presence of flame, line 12. If flame is sensed, the gas valve remains energized and the igniter is de-energized. The heating fan relay coil

Answer to Question 2

The W terminal of the thermostat energizes the sequencer coil. Sequencer S1 contacts close to energize heater 1 and the blower motor. Sequencer S2 closes to energize heater 2


elizabeth18

  • Hero Member
  • *****
  • Posts: 559
Reply #2 on: Jul 26, 2018
Both answers were spot on, thank you once again


aprice35067

  • Sr. Member
  • ****
  • Posts: 337
Reply #3 on: Jul 26, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

Did you know?

Blastomycosis is often misdiagnosed, resulting in tragic outcomes. It is caused by a fungus living in moist soil, in wooded areas of the United States and Canada. If inhaled, the fungus can cause mild breathing problems that may worsen and cause serious illness and even death.

Did you know?

Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

Did you know?

Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

(A) Figure illustrating the location and appearance of a peptic ulcer in both the stomach and the du (A) Figure illustrating the location and appearance of a peptic ulcer in both the stomach and the du
Pneumothorax. Figure illustrates how puncture of thoracic wall and tearing of pleural membrane allow Pneumothorax. Figure illustrates how puncture of thoracic wall and tearing of pleural membrane allow
Example of the Tabular List and instructional notes (conventions). Example of the Tabular List and instructional notes (conventions).
Demonstrate the Application of Triangular, Figure-Eight, and Tubular Bandages Demonstrate the Application of Triangular, Figure-Eight, and Tubular Bandages
Mobilize each metatarsal–phalangeal joint with figure-8s. Hold the tarsal just below the ... Mobilize each metatarsal–phalangeal joint with figure-8s. Hold the tarsal just below the ...
Major Minerals List Major Minerals List
Video: EpiPen Animation (Part 2)

For a complete list of videos, visit our video library