Residential Heating Systems And Equipment (110104g)

Question 1

What is the heart of the HVAC system?

Answer 1

The air recirculation fan

Question 2

What is a furnace?

Answer 2

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

Question 3

What does BTU stand for?

Answer 3

British Thermal Unit

Question 4

A BTU is defined as?

Answer 4

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.

Question 5

Two different types of gas burners?

Answer 5

Inshot and upshot

Question 6

What is the heating value of natural gas?

Answer 6

1000 btu

Question 7

What is the heating value of propane?

Answer 7

2500 btu

Question 8

The burning of any fuel requires what?

Answer 8

Oxygen

Question 9

What is recommended humidity level?

Answer 9

Between 30 and 55 percent

Question 10

What types of fuels do furnaces use?

Answer 10

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

Question 11

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

Answer 11

Inducer motor

Question 12

What are some types of safety controls for furnaces?

Answer 12

Highlimit
CAD sensor sense light

Question 13

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

Answer 13

Counter flow

Question 14

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

Answer 14

Upflow most commonly used

Question 15

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

Answer 15

Lowboy furnace

Question 16

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

Answer 16

Plastic 636 pvc

Question 17

What type of furnace is 78% efficient?

Answer 17

Mid efficiency furnace

Question 18

What type of furnace is 78% or lower?

Answer 18

Low efficiency

Question 19

What type of furnace is 88% and above efficiency?

Answer 19

High efficiency

Question 20

What is the heating value of electricity compared to BTUH?

Answer 20

1 watt = 3.413 BTU

Question 21

What are two types of oil burners?

Answer 21

Vaporizing and atomizing

Question 22

What oil burner is most commonly used today ?

Answer 22

Atomizing

Question 23

What are solid fuels comprised of?

Answer 23

Wood, coal and wood pellets

Question 24

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

Answer 24

Air shutters, gas burners

Question 25

What is dilution air?

Answer 25

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

Question 26

What is the main use of the heat exchanger?

Answer 26

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

Question 27

What is a CAD sensor?

Answer 27

CAD is a cadmium sulfide cell.

Question 28

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

Answer 28

Barometric damper

Question 29

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

Answer 29

Buoyancy

Question 30

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

Answer 30

Inducer motor Plastic venting Secondary heat exchanger

Question 31

What are two typed of fan coils?

Answer 31

Electrical or liquid medium

Question 32

What does static electricity indicate?

Answer 32

There is not enough humidity

Question 33

What are the types of humidifiers?

Answer 33

Pan evaporators Bypass drum type Bypass flow through Atomizing

Question 34

What type of pads does a pan evaporator use?

Answer 34

Wicking pads

Question 35

What is a humidistat?

Answer 35

A moisture controlled switch

Question 36

What are the three main components of a AC system?

Answer 36

Evaporator coil or A coil Condenser unit Compressor unit

Question 37

What should never be connected to an HRV system?

Answer 37

Range hoods and dryer vent

Question 38

What does HRV stand for?

Answer 38

Heat recovery ventilation

Question 39

What is CFM?

Answer 39

Cubic feet per minute

Question 40

What is the most common type of HVAC plenum system?

Answer 40

Extended reducing

Question 41

What is combustion air?

Answer 41

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

Question 42

What are the byproducts of combustion?

Answer 42

Carbon monoxide Oxides of nitrogen Unburned carbon Soot

Question 43

What type of venting does a solid fuel furnace use?

Answer 43

A vent I vent Masonry chimney

Question 44

Why do we need to vent buildings?

Answer 44

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

Question 45

What does exfiltration mean?

Answer 45

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

Question 46

What does infiltration mean?

Answer 46

Air that comes in through cracks in the building like drafts

Question 47

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

Answer 47

10 to 1

Question 48

What is a cord if wood sold in?

Answer 48

4' x 4' x 8'

Question 49

What kind of switch is a thermostat?

Answer 49

Temperature sensing

Question 50

What is a radial HVAC system?

Answer 50

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

Question 51

When does an extended plenum have to be reduced?

Answer 51

After a maximum of 24 feet

Question 52

When is an appliance a direct vent appliance?

Answer 52

When there is a combustion air hook up

Question 53

High efficiency furnaces are also know as?

Answer 53

Condensing furnace

Question 54

Three types of fireplaces?

Answer 54

Built in Free standing Gas insert

Question 55

Why is maintaining proper humidity in a house important?

Answer 55

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

Question 56

What is major disadvantage of radial system?

Answer 56

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

Question 57

Where is a perimeter loop system not often used?

Answer 57

Residential heating systems above ground

Question 58

What is a common problem with reducing extended plenum?

Answer 58

Loss of air speed,

Question 59

What does a combustion air termination do?

Answer 59

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

Question 60

What is main advantage of pleated filter over standard mesh?

Answer 60

Pleated filters provide protection against smaller particles

Question 61

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

Answer 61

Feet per minute

Question 62

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

Answer 62

CFM or Cubic feet per minute