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ICA > ICA Module 2 Section 2 Air Conditioning > Flashcards

ICA Module 2 Section 2 Air Conditioning Flashcards

1
Q

List at least 10 items that affect the amount of air-conditioning needed in a home

A

outdoor temp, outdoor humidity, level of insulation in home, air gaps, how many panes are in windows

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2
Q

How many square feet can 1 ton of air-conditioning cool in Florida?

A

450-700 sqft

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3
Q

How many square feet can 1 ton of air-conditioning cool in Michigan?

A

700-1000 sqft

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4
Q

Oversized distribution ductwork is a common problem with central air-conditioning. T/F

A

False

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5
Q

An undersized air conditioner is better than an oversized one. T/F

A

True

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6
Q

The typical temperature drop from outdoors to indoors with a properly operating air-conditioning system would be about 15 degrees F. T/F

A

True

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7
Q

What kind of temperature drop would you expect to find in the house air as it passes over the evaporator coil?

A

15 degrees

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8
Q

A compressor can be thought of as a pump. T/F

A

True

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9
Q

Compressors are typically located indoors on an air-to-air split system air-conditioning system. T/F

A

False

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10
Q

What is the function of a sump or a crankcase heater?

A

Keeps oil warm enough to boil off refrigerant

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11
Q

List 8 common compressor problems.

A

excess noise, short cycling, not level, wrong breaker size, not cooling, not working

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12
Q

The condenser coil in a split system is typically located ___.

A

in cabinet (condenser unit)

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13
Q

The evaporator coil in a split system is typically located _____.

A

just past furnace heat exchanger

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14
Q

The condenser fan in a split system is located _____.

A

in front of compressor & condenser coil

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15
Q

List 4 condenser-coil problems.

A

dirty, damaged, corrosion, dryer exhaust too close

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16
Q

List 3 common configurations of evaporator coils.

A

A coil, N coil, Slab coil

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17
Q

Evaporator coils should be upstream of furnace heat exchanges. T/F

A

False

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18
Q

List 6 common evaporator problems.

A

no access to coil, dirty, frost, damage, corrosion

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19
Q

In one sentence, describe the function of a capillary tube.

A

expansion device

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20
Q

In one sentence, describe the function of a thermostatic expansion valve.

A

metering device

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21
Q

List 4 common expansion device problems

A

capillary tube defects, loose, clogged, sticking

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22
Q

List 5 possible causes of leaking condensate drain pans

A

rust, cracks, dirt accumulation, improper slope

23
Q

When is an auxillary condensate drain pan needed?

A

above finished living space

24
Q

What are condensate drain lines usually made of?

A

plastic, copper

25
Q

Do condensate drain lines ever have a trap?

A

Yes

26
Q

What is the purpose of the condensate trap?

A

use weight of water to stop the flow of air (like a P-trap)

27
Q

List 2 acceptable discharge points for condensate drain lines & 1 generally unacceptable discharge point.

A

Acceptable=sink, floor drain
Not Acceptable=through floor (slab)

28
Q

List 3 common condensate pump problems

A

not working, leaking, poorly wired

29
Q

Refrigerant lines are usually made of ___

A

copper

30
Q

The larger refrigerant lines contains a liquid T/F

A

False

31
Q

The smaller refrigerant line is called the suction line. T/F

A

False

32
Q

The larger refrigerant line is called the return line. T/F

A

True

33
Q

List 5 common refrigerant line problems.

A

leaking, damage, missing insulation, too warm/cold, too c?

34
Q

How would you normally identify a leak in a refrigerant line visually?

A

oil residue

35
Q

Which line should be cold when the system is operating?

A

suction/return line (large line)

36
Q

Which line should be warm when the system is operating?

A

liquid line (small line)

37
Q

Which line should be insulated?

A

suction line (large line)

38
Q

Where is the condenser fan in a split system located?

A

condenser cabinet

39
Q

What is the typical inlet & outlet temperature of air across the condenser fan?

A

20 & 50 degrees

40
Q

List 4 common condenser-fan problems.

A

noisy, not working, corrosion, obstructed air flow

41
Q

Where is the evaporator fan typically located in a split system?

A

inside air handler (inside house)

42
Q

The amount of air that must cross an evaporator coil in a heating climate is less than the amount of air that must cross a conventional furnace heat exchanger coil. T/F

A

?

43
Q

Oversized ducts are a common problem. T/F

A

False

44
Q

High-level returns are more appropriate for heating than cooling. T/F

A

False?

45
Q

Ducts passing through unconditioned spaces such as attics or crawlspaces should be _____.

A

insulated & air tight

46
Q

List 7 common problems with thermostats

A

not working, loose, dirty, damaged, not level, poor location

47
Q

How long do air-conditioning systems typically last in your area?

A

10-15 years

48
Q

What is the typical warranty period for a compressor?

A

10 years

49
Q

Heat pumps are generally sized based on:
A. heating load
B. cooling load
C. other

A

A-heating load (capacity)

50
Q

The implication of an oversized heat pump during the summer months is what?

A

damp climate indoors

51
Q

You should not operate the heat pump in the heating mode when the outdoor temperature is above _____.

A

65 degrees

52
Q

You should not operate the heat pump in the cooling mode when the outdoor temperature is below _____.

A

65 degrees

53
Q

List at least 8 clues that would suggest that you are looking at a heat pump rather than a central air-conditioning system.

A

data plate, if thermostat has emergency heat setting, 2 stage thermostat, both lines are insulated, reversing valve present, 2 expansion devices, compressor indoors, outdoor thermostat, operated in winter

54
Q

List 7 common heat pump problems distinct from common air-conditioning problems.

A

oversized for cooling/undersized for heating, inoperative, poor control coil location, coil iced up, air flow problems, no back up heat, old

ICA (26 decks)

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