This topic contains a solution. Click here to go to the answer

Author Question: Why do closed hydronic systems include pressure-relief valves, expansion tanks, and temperature and ... (Read 112 times)

maegan_martin

  • Hero Member
  • *****
  • Posts: 532
Why do closed hydronic systems include pressure-relief valves, expansion tanks, and temperature and pressure-limiting devices?
 
  A) Because the copper piping used in the system requires these measures
  B) Because freezing must be prevented and antifreeze may not be added
  C) Because building codes require certain controls on every system
  D) Because water expands and contracts as its temperature changes

Question 2

What smoke spot number represents correct combustion in newer burners?
 
  A) 1 or less B) 1 or more C) 0 D) 2 or less



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ilianabrrr

  • Sr. Member
  • ****
  • Posts: 332
Answer to Question 1

D

Answer to Question 2

A




maegan_martin

  • Member
  • Posts: 532
Reply 2 on: Jul 24, 2018
:D TYSM


shewald78

  • Member
  • Posts: 340
Reply 3 on: Yesterday
Gracias!

 

Did you know?

In 1864, the first barbiturate (barbituric acid) was synthesized.

Did you know?

Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

For a complete list of videos, visit our video library