Deck 9: Hydronic Heating and Controls

Question 1

Which type of tank operates at atmospheric pressure and is located at highest point of system?

A)compression tank
B)drain tank
C)expansion tank
D)downfeed tank

Answer 1

C

Question 2

Which of the following is a valve located at the lowest point of the system to provide a drain for the system?

A)drain cock
B)direct return
C)flow fitting
D)flow control valve

Answer 2

A

Question 3

A balancing valve is designed to add flow resistance to one circuit in a water system, diverting more flow towards another portion.

Answer 3

True

Question 4

Which type of valve consists of a check valve with a fairly heavy closure disk?

A)flow control valve
B)drain cock
C)high limit control valve
D)low-water valve

Question 5

What is the primary difference between hot water and steam heating systems?

A)hot water systems run at temperatures, pressures above saturation temperature of water
B)hot water systems run at temperatures, pressures below saturation temperature of water
C)boilers feature an open container
D)boilers feature a closed container

Question 6

What is the purpose of a multiple zone system?

A)creates two different heat temperatures in a boiler
B)permits independent heating in sections of a building
C)allows for multiple boilers to be installed
D)permits both heating and cooling as needed

Question 7

Which of the following is an example of a terminal unit?

A)convector
B)air vent
C)float
D)seat

Question 8

Which of the following is installed on a terminal and controls flow through the terminal?

A)relief valve
B)pressure-reducing valve
C)flow control valve
D)radiator valve

Question 9

When installing forced hot water heating systems, which of the following must happen?

A)minimum operating pressure must be high enough to maintain water at highest terminals
B)air vents should be installed at each terminal and at system high points
C)compression tank should be installed to provide air to minimize pressure variations
D)all of the above

Question 10

In what situation would natural or gravity circulation most likely be encountered?

A)in ultra-modern buildings
B)in forced circulation systems when pumps are off
C)in forced circulation system when pumps are at full speed
D)none of the above

Question 11

A downfeed system is a hydronic system with the supply main below the terminals.

Question 12

Air bound is a condition in which so much air has collected in the system that the flow of water is stopped.

Question 13

Which of the following uses a liquid-to-air heat exchanger to transfer heat to a space?

A)fan coils
B)aquastat
C)940
D)circuit

Question 14

Which of the following turns off a burner when the boiler reaches a set temperature?

A)flow fitting
B)high limit control
C)low-water fuel cutoff
D)flow control valve

Question 15

Modern fan coil unit controls provide what type of benefit?

A)allow control of individual units spread throughout building
B)allow for holistic view of building, with better control
C)allows for computer-controlled temperature management
D)all of the above