Hydronic Heating Systems

Question 1

In a heating system , the main advantage of copper tubing is its resistance to corrosion in the presence of oxygen

True or false

Answer 1

True

Question 2

Pex is not a thermoplastic material

True or false

Answer 2

False

Question 3

As water passes through a Venturi T (mono flow T) on the outlet of a connector, it will cause an increase in velocity and a decrease in pressure.

True or false

Answer 3

True

Question 4

In a series loop system, the heat transfer units will be smaller towards the end of the loop.

True or false

Answer 4

False

Question 5

A differential pressure regulator sets the minimum pressure of a boiler system.

True or false

Answer 5

False

Question 6

Zone valves are only operated by low voltage (24v)

True or false

Answer 6

False
Some are pneumatic

Question 7

Normally closed zone valves can’t be manually opened.

True or false

Answer 7

False

Question 8

A reverse acting thermostat (cooling stat) is used to operate a normally open zone valve.

True or false

Answer 8

True

Question 9

It is best to install a circulator down stream of the diaphragm tank

True or false

Answer 9

True

Question 10

Which copper tube has the thickest walls?

Answer 10

Type K

Question 11

Copper tubing with blue lettering is type?

Answer 11

L

Question 12

What are the disadvantages of copper tubing in hydronic heating?

Answer 12

High coefficient of expansion.

Question 13

Which type of copper was developed specifically for hydronic heating, but is no longer available?

Answer 13

H

Question 14

When looking at the markets BFA on pex tubing what do the markings SDR stand for?

Answer 14

Standard dimension ratio

Question 15

In a gravity heating system what forces the movement of water?

Answer 15

Convection currents

Question 16

A series loop system should be limited to what range of MBH?

Answer 16

60-70 MBH

Question 17

Ina reverse return system which supply is the last returned?

Answer 17

Th first

Question 18

Ina gravity heating system why forces the movement of water?

Answer 18

Water density

Question 19

What valve body is best suited for balancing type applications in heating?

Answer 19

Globe

Question 20

What are the 2 types of rad valves?

Answer 20

Sleeve and disc

Question 21

Thermostatic rad valves are actuated by what?

Answer 21

Liquid filled capillary tube.

Question 22

What happens when a zone valve is installed backwards?

Answer 22

It will make a loud noise upon closing.

Question 23

What will happen if air is trapped in a heating system?

Answer 23

Promote corrosion of ferrous components

Damage to the seals and bearing of the circulator

Reduce efficiency of heat transfer units

Question 24

In a circulation pump , the part of the pump that encases the impeller and liquid is called what?

Answer 24

The Volute.

Question 25

What is a BTU?

Answer 25

British Thermal Unit
Quantity of heat used to raised one lb of water 1 degree F

Question 26

What a a series loop system?

Answer 26

Question 27

What is a Series Loop Piping Split?

Answer 27

Question 28

One pipe systems use diverted tees to limit the flow to each heating unit.

True or false?

Answer 28

True

Question 29

I’m a reverse return system the first supply is returned when?

Answer 29

Last

Question 30

I’m not a zoned 2 pipe system flow paths of each zone may differ. What valve must be used to correct this?

Answer 30

Balancing valve.