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

Author Question: When will a preheater turn on? What will be an ideal response? ... (Read 16 times)

hubes95

  • Hero Member
  • *****
  • Posts: 561
on: Jul 26, 2018
When will a preheater turn on?
 
  What will be an ideal response?

Question 2

What acts as the primary control for all HVACR functions in a DDC system?
 
  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

meltdown117

  • Sr. Member
  • ****
  • Posts: 326
Reply #1 on: Jul 26, 2018
Answer to Question 1

The preheater will turn on when the incoming air drops below a pre-set temperature. This should be well above the freezing temperature of the coil that may vary from system to system depending on the amount of glycol added to the chill water loop.

Answer to Question 2

A computer.


hubes95

  • Hero Member
  • *****
  • Posts: 561
Reply #2 on: Jul 26, 2018
Thank you!


meltdown117

  • Sr. Member
  • ****
  • Posts: 326
Reply #3 on: Jul 26, 2018
Always glad to help...


« previous next »
 

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Did you know?

Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

Agonists, partial agonists, and antagonists: (a) An agonist results in maximum response. (b) A ... Agonists, partial agonists, and antagonists: (a) An agonist results in maximum response. (b) A ...
Apply oil or lotion across shoulders and to posterior neck. Turn the head to one side to access the ... Apply oil or lotion across shoulders and to posterior neck. Turn the head to one side to access the ...
Turn baby over, placing him or her sideways across your legs if on floor or across pillow. Turn baby over, placing him or her sideways across your legs if on floor or across pillow.
Immune Response to a Food Allergen Immune Response to a Food Allergen
Acquisition and Extinction of a Salivary Response Acquisition and Extinction of a Salivary Response
The CRISPR/Cas system mediates an adaptive immune response in prokaryotes The CRISPR/Cas system mediates an adaptive immune response in prokaryotes
Video: Introduction to Insulin

For a complete list of videos, visit our video library