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Heating Review > Heating Review #2 > Flashcards

Heating Review #2 Flashcards

1
Q

How does a LWCO or flow switch protect the boiler

A

Shuts off the gas to the gas valve if there’s no water flow in the system

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2
Q

What type of sensing device uses a bourdon tube

A

A pressure gauge

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3
Q

What two conditions induce gas or gases to come out of a water solution

A

High temp/low pressure

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4
Q

What air separation device would be used on a high mass boiler

A

Boiler scoop

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5
Q

In turbulent flow what type of air separation device would be used

A

Micro bubble resorber

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6
Q

How much does water expand between 39F (4C) and 212F (100C)

A

5%

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7
Q

What type of expansion tank must be installed above a boiler

A

Cushion tank

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8
Q

What valve is used to connect the heating system to a cushion tanks

A

An airtrol valve

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9
Q

What is the max temp of an atmospheric expansion tank

A

180F

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10
Q

What type of circulator must the motor installed horizontally

A

Wet rotor

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11
Q

What type of pump is used on a hydronic heating system

A

Centrifugal

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12
Q

What pressure would a PRV be set for a residential heating system

A

12 psi

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13
Q

What device must be installed upstream of a PRV for residential heating system

A

Back flow preventer

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14
Q

What type of sensing device would you find controlling a steam boiler

A

A pressure control

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15
Q

What type of copper tubing should not be used in a hydronic heating system

A

DWV

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16
Q

What colour is the markings on type H copper tube

A

White

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17
Q

What steel piping joining system provides a union at every joint

A

Rolled or grooved fitting ( Victaulic)

18
Q

What material provides the lowest resistance to flow

A

Copper/CU

19
Q

What is the main disadvantage of a gravity heating system

A

Large loop size

20
Q

What heating distribution system uses a special Venturi tees

A

Monoflow system

21
Q

What is the max rating for a series or perimeter loop

A

60,000 (60 MBH) - 70,000 (70 MBH)

22
Q

What is the disadvantage of a two-pipe direct system

A

Hard to balance

23
Q

What heating distribution system has first served, last returned heating emission units

A

Two pipe reverse return

24
Q

What type of valve should be used for balancing/throttling

A

Globe

25
Q

What methods can be used to prevent a circulator deadheading

A

Wild loop, differential pressure regulator

26
Q

What type of valve is used to balance and prevent unauthorized operation

A

Lock shield

27
Q

What’s the normal voltage used on an electric control system

A

25V

28
Q

What is the purpose of an end switch on a zone valve

A

Used to control an auxiliary device I.E another boiler pump

29
Q

What operates a pneumatic valve

A

Air

30
Q

What pressure is required to operate a pneumatic valve

A

3 psi -15 psi

31
Q

What device is best located at the point of highest temp and lowest pressure

A

Air separator device (boiler scoop)

32
Q

What device should be installed at the high points of a heating system

A

Air vents

33
Q

What’s the purpose of a boiler scoop

A

To remove air

34
Q

What conditions would cause binding or airlock in a heating system

A

Entrapped air/gas

35
Q

What is the best fitting to use when connecting two different size of pipe

A

eccentric reducing coupling

36
Q

What device motivates the water in a closed heating system

A

A circulator

37
Q

How are circulators rates

A

USGPM/ Feet of head pressure

38
Q

What type of circulator has system water between the rotor and stator

A

A wet rotor circulator

39
Q

What position must the motor always be in a when installing a wet rotor

A

Horizontal

40
Q

Where should the circulator be installed in relation to the expansion tanks

A

Downstream

41
Q

What valve should be used to prevent unwanted circulation (also known as ghost flow) in a system caused by convection

A

A flow control valve

Heating Review (2 decks)

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