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Home Inspection > HVAC > Flashcards

HVAC Flashcards

1
Q

What type burner is usually installed in high-efficiency furnaces with forced-draft?

A

A mono-port burner

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2
Q

Round or square supply ducts that are connected to and branch off the extended duct are called?

A

Side takeoffs.

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3
Q

On low-pressure boilers, the PRV is set to open at what pressure?

A

15 psi

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4
Q

A warm-air supply duct that runs horizontally from the furnace plenum to a riser is called what?

A

A leader

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5
Q

How much does one cubic foot of water at 68° F weigh?

A

62 pounds

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6
Q

The intermittent pilot is the main distinguishing characteristic of which furnace?

A

The mid-efficiency furnace

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7
Q

What causes the air of a gravity warm-air furnace to circulate through the house ?

A

The different weights of warm and cool air.

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8
Q

According to plumbing standards, gas meters should be what?

A

Lockable

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9
Q

Where should air filters be installed?

A

in the plenum or duct in the
path of the return air.

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10
Q

The flue pipe of a fuel-burning heating system should at least be the same size as what?

A

The furnace’s connector.

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11
Q

On a furnace with a standing-pilot light, the thermal couple has to do what before the gas valve opens?

A

Determines if there is a flame.

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12
Q

What is the minimum efficiency rating for furnaces?

A

78%

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13
Q

A hydronic heating system is what type of system ?

A

A forced hot-water heating system

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14
Q

The older gas furnaces have what type of pilot light?

A

A standing-pilot light.

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15
Q

What is the loop in the return pipe that prevents the loss of water if the line develops a leak called?

A

A Hartford return.

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16
Q

Which type of furnace has a fan that pulls air into the combustion chamber, through the heat exchanger, and blows it out through the venting system?

A

An induced draft furnace.

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17
Q

A conventional low-efficiency, natural-draft, gas-fired furnace requires how many cubic feet of air per cubic foot of gas burned?

A

About 30 cubic feet.

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18
Q

How is the efficiency of cooling systems

in a residential installation is expressed?

A

Seasonal Energy Efficiency Ratio (SEER).

19
Q

Heating systems can be categorized in what four ways?

A

Gas, Steam, Hydronic, or Electric.

20
Q

A Hot-surface ignition device on a furnace is also called what?

A

A glow plug or glow stick

21
Q

A downflow, counter-flow, or downdraft furnace are the_______?

A

Same thing.

22
Q

This transfers the heat from the air passing over it to the refrigerant passing through it on an AC unit.

A

The evaporator

23
Q

For an oil-fired furnace, what automatically reduces (or dilutes) the chimney draft to the optimal amount?

A

The barometric damper

24
Q

How can an up flow forced-air furnace be designed for low clearances?

A

By located the warm-air outlet and return-air inlet at the top of the furnace?

25
Q

Boiler water pressure is reduced from plumbing water pressure by using what?

A

A PRV.

26
Q

When inspecting an evaporating cooler, the report should state if the unit is one-______ or _________?

A

one-speed or two-speed

27
Q

What’s the typical cooling load per square foot for the south?

A

One ton per 450-700.

28
Q

A condensing furnace has an average SEER of what?

A

90%

29
Q

Heating/Plumbing pipes that pass through unheated space should be insulated to a minimum of what?

A

R-4

30
Q

A gas furnace with a yellow flame indicates what?

A

Insufficient primary air

31
Q

What control on an electric furnace ensures that the individual elements don’t all turn on at the same time?

A

A sequencer

32
Q

On an evaporator cooler, what is the minimum air gap between the water discharge at the float and the water level?

A

1-inch

33
Q

For a 110-volt window/portable ac, what is the maximum cord length?

A

10-feet

34
Q

When a heat pump system is switched from cool to heat, what is activated?

A

The four-way reversing valve.

35
Q

How many BTUs are in a kilowatt hour?

A

3412 btus.

36
Q

Which burner has a larger output: Monoport or Ribbon?

A

Monoport

37
Q

Vent pipe should slope upward at what per foot?

A

1/4-inch

38
Q

For a boiler, what is the typical setting for a low temperature limit or primary control?

A

140F

39
Q

High-efficiency boilers commonly have problems with their what?

A

Heat exchangers.

40
Q

What color should the flame of an oil-fired heating system be?

A

Orange and yellow

41
Q

Any heating system that does not operate should be reported as?

A

In need of correction.

42
Q

Which furnace uses a fan to pull air into the burner?

A

An induced-draft

43
Q

Flue pipes from two fuel-burning appliances should not not enter a chimney from opposite sides at what ?

A

The same height.

Home Inspection (13 decks)

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