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 209 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?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Pre–Main-Sequence Stars Pre–Main-Sequence Stars
Post–Main-Sequence Evolution Post–Main-Sequence Evolution
Conversion List Conversion List
Common restriction enzymes, with their recognition sequence, DNA cutting patterns, and sources Common restriction enzymes, with their recognition sequence, DNA cutting patterns, and sources
Cladogram Based On DNA Sequence Cladogram Based On DNA Sequence
Cladogram Based On DNA Sequence Cladogram Based On DNA Sequence
Video: Bipolar Disorder

For a complete list of videos, visit our video library