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Sheet Metal First Year > Residential Heating Systems And Equipment (110104g) > Flashcards

Residential Heating Systems And Equipment (110104g) Flashcards

1
Q

What is the heart of the HVAC system?

A

The air recirculation fan

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2
Q

What is a furnace?

A

A piece of equipment that transforms fuel into heat energy and distributes that energy through the HVAC system

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3
Q

What does BTU stand for?

A

British Thermal Unit

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4
Q

A BTU is defined as?

A

The amount of heat required to raise one pound of water 1 degree Fahrenheit or in HVAC one BTU will heat approximately 55 cubic feet of air 1 degree Fahrenheit.

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5
Q

Two different types of gas burners?

A

Inshot and upshot

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6
Q

What is the heating value of natural gas?

A

1000 btu

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7
Q

What is the heating value of propane?

A

2500 btu

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8
Q

The burning of any fuel requires what?

A

Oxygen

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9
Q

What is recommended humidity level?

A

Between 30 and 55 percent

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10
Q

What types of fuels do furnaces use?

A

Natural gas, propane, oil fuel, solid fuel aka coal wood.

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11
Q

What is used in high efficiency furnace in place of the draft hood?

A

Inducer motor

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12
Q

What are some types of safety controls for furnaces?

A

Highlimit
CAD sensor sense light

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13
Q

What type of furnace has the return air on top and supply air on bottom?

A

Counter flow

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14
Q

What type of furnace has return air on the side and supply air on top?

A

Upflow most commonly used

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15
Q

What type of furnace has both return and supply air on top of unit?

A

Lowboy furnace

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16
Q

What type of venting must be used on a high efficiency furnace?

A

Plastic 636 pvc

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17
Q

What type of furnace is 78% efficient?

A

Mid efficiency furnace

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18
Q

What type of furnace is 78% or lower?

A

Low efficiency

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19
Q

What type of furnace is 88% and above efficiency?

A

High efficiency

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20
Q

What is the heating value of electricity compared to BTUH?

A

1 watt = 3.413 BTU

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21
Q

What are two types of oil burners?

A

Vaporizing and atomizing

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22
Q

What oil burner is most commonly used today ?

A

Atomizing

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23
Q

What are solid fuels comprised of?

A

Wood, coal and wood pellets

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24
Q

Where are some locations where air is required to burn fuel in the combustion process?

A

Air shutters, gas burners

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25
Q

What is dilution air?

A

Air with contaminates that is cooled down in the draft hood before being expelled out

26
Q

What is the main use of the heat exchanger?

A

It separates the air that circulates through the house from the products of combustion

27
Q

What is a CAD sensor?

A

CAD is a cadmium sulfide cell.

28
Q

What is used in place of a draft hood for fuel furnaces as well as oil furnaces?

A

Barometric damper

29
Q

What does a furnace rely on even with an inducer motor to vent?

A

Buoyancy

30
Q

What does a high efficiency furnace have that others don’t?

A

Inducer motor
Plastic venting
Secondary heat exchanger

31
Q

What are two typed of fan coils?

A

Electrical or liquid medium

32
Q

What does static electricity indicate?

A

There is not enough humidity

33
Q

What are the types of humidifiers?

A

Pan evaporators
Bypass drum type
Bypass flow through
Atomizing

34
Q

What type of pads does a pan evaporator use?

A

Wicking pads

35
Q

What is a humidistat?

A

A moisture controlled switch

36
Q

What are the three main components of a AC system?

A

Evaporator coil or A coil
Condenser unit
Compressor unit

37
Q

What should never be connected to an HRV system?

A

Range hoods and dryer vent

38
Q

What does HRV stand for?

A

Heat recovery ventilation

39
Q

What is CFM?

A

Cubic feet per minute

40
Q

What is the most common type of HVAC plenum system?

A

Extended reducing

41
Q

What is combustion air?

A

Combustion air is the air an appliance needs to replenish, for the air to be exhausted so a vacuum effect doesn’t occur.

42
Q

What are the byproducts of combustion?

A

Carbon monoxide
Oxides of nitrogen
Unburned carbon
Soot

43
Q

What type of venting does a solid fuel furnace use?

A

A vent
I vent
Masonry chimney

44
Q

Why do we need to vent buildings?

A

To remove excessive moisture and rid the house of combustion type gas

45
Q

What does exfiltration mean?

A

The air that escapes through gaps in the building like openings around windows

46
Q

What does infiltration mean?

A

Air that comes in through cracks in the building like drafts

47
Q

What is the required gas to air ratio for natural gas and propane?

A

10 to 1

48
Q

What is a cord if wood sold in?

A

4’ x 4’ x 8’

49
Q

What kind of switch is a thermostat?

A

Temperature sensing

50
Q

What is a radial HVAC system?

A

Octopus looking one that uses a counter flow furnace and is easy to install.

51
Q

When does an extended plenum have to be reduced?

A

After a maximum of 24 feet

52
Q

When is an appliance a direct vent appliance?

A

When there is a combustion air hook up

53
Q

High efficiency furnaces are also know as?

A

Condensing furnace

54
Q

Three types of fireplaces?

A

Built in
Free standing
Gas insert

55
Q

Why is maintaining proper humidity in a house important?

A

-To prevent warping and splitting of furniture, wood work and hardwood floors
- prevent static electricity
- reduce levels of mites, bacteria, mold etc

56
Q

What is major disadvantage of radial system?

A

You may encounter cold rooms because of heat loss due to length of pipe.

57
Q

Where is a perimeter loop system not often used?

A

Residential heating systems above ground

58
Q

What is a common problem with reducing extended plenum?

A

Loss of air speed,

59
Q

What does a combustion air termination do?

A

It helps to keep cold air from dropping into the furnace room

60
Q

What is main advantage of pleated filter over standard mesh?

A

Pleated filters provide protection against smaller particles

61
Q

What refers to speed of air or how far air from fan will travel in one minute?

A

Feet per minute

62
Q

What refers to the amount of air that a fan can move?

A

CFM or Cubic feet per minute

Sheet Metal First Year (31 decks)

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