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ICA > Module 2 Test Cooling Study Cards > Flashcards

Module 2 Test Cooling Study Cards Flashcards

1
Q

List 10 items that affect the amount of air conditioning needed in a home.

A

outdoor temp, outdoor humidity, insulation levels, single/double/triple window panes, whether windows are low e, window coverings open/closed, amount of shade from trees, roof overhang, awnings, amount heat generated inside by people, amount of east/west facing glass.

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2
Q

How many square feet can one ton of A.C. cool in Florida?

A

450 to 750 sgft

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3
Q

How many square feet can one ton of A.C. cool in Michigan?

A

700 to 1000 sqft

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4
Q

Oversized distribution ductwork is a common problem with central A.C. T/F

A

False

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5
Q

An undersized AC 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 AC 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

15-20 degrees F

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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 AC system. T/F

A

False

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10
Q

What is the function of a sump or crankcase heater?

A

It keeps the oil at the base of the compressor warm enough to boil off the refrigerant

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11
Q

List 8 common compressor problems:

A

excessive noise/vibration, short cycling/running continuously, out of level, wrong fuse or breaker size, electric wires too small, missing electrical shut off, inoperative, inadequate cooling

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12
Q

The condenser coil in a split system is typically located_.

A

outdoors

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13
Q

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

A

indoors (above furnace)

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14
Q

The condenser fan in a split system is located __.

A

outdoors

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15
Q

List 4 condenser problems

A

dirty, damaged or leaking, corrosion, dryer or water heater exhaust too close

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16
Q

List 3 common configurations of evaporator coils.

A

A-coil, slab coil, vertical coil

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17
Q

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

A

False

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18
Q

List 6 common evaporator problems:

A

no access to coil, dirty, frost, top evaporator dry, corrosion, damage

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19
Q

In 1 sentence, describe the function of a capillary tube

A

The capillary tube acts as an obstruction in the line, reducing the pressure and temperature of the liquid refrigerant

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20
Q

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

A

A TXV, or TEV acts as a more precise expansion device on larger AC or heat pumps.

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21
Q

List 4 common expansion device problems

A

capillary tube defects, thermostatic expansion valve connections loose, clogged orifice, expansion valve sticking

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22
Q

List 5 possible causes of leaking condensate drain pans.

A
  1. pan cracked or open seam
  2. opening to drain line may be obstructed
  3. drain line may be missing or disconnected
  4. pan may not be sloped properly, allowing water to overflow rather than run to the drain
  5. pan may be rusted through
  6. pan may not be properly located below the coil
  7. pan may be filled with debris, restricting the amount of water it can hold
23
Q

When is an auxiliary condensate drain pan needed?

A

auxiliary pan is needed when the evaporator coil is located in attic, or anywhere over a finished living space.

24
Q

What are condensate drain lines usually made of?

A

plastic or copper

25
Q

Do condensate drain lines ever have a trap?

A

condensate line from the primary pan may or may not have a trap. Lines from secondary pans should never be trapped.

26
Q

If condensate drain lines have a trap, what is its purpose?

A
  1. trap may be required if the condensate pan is upstream of the house air fan, b/c the water is under negative pressure.
  2. if the condensate is allowed directly into waste plumbing, a trap is required.
27
Q

List 2 acceptable discharge points for condensate drain lines and one generally unacceptable discharge point.

A

acceptable: outside the building directly into the ground, near the basement floor drain
unacceptable: into the granular fill beneath the basement floor slab, into the waste plumbing stack

28
Q

List 3 common condensate pump problems

A

inoperative, leaking, poor wiring

29
Q

Refrigerant lines are usually made of:

A

copper

30
Q

The larger refrigerant line 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
  1. leaking
  2. damage
  3. missing insulation
  4. lines too warm or cold
  5. lines touching each other
34
Q

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

A

This may be identified by an oil residue below the line set, typically at valves or coil connection

35
Q

Which line should be cold when the system is operating?

A

suction line

36
Q

Which line should be warm when the system is operating?

A

liquid line

37
Q

Which refrigerant line should be insulated?

A

suction line

38
Q

Where is the condenser fan in a split system?

A

outside in the condenser unit

39
Q

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

A

inlet temperature is outdoor air temperature, & outlet temperature is roughly 15 to 20 degrees F higher than the outdoor temperature

40
Q

List 4 common condenser fan problems.

A

excessive noise/vibration, inoperative, corrosion or mechanical damage, obstructed air flow

41
Q

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

A

Indoors

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

False

43
Q

Oversized ducts are a common problem. T/F

A

False

44
Q

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

A

False

45
Q

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

A

Insulated, with appropriate vapor barriers

46
Q

List 7 common problems with thermostats.

A
  1. Inoperative
  2. poor location
  3. not level
  4. loose
  5. dirty
  6. damaged
  7. poor adjustment/calibration
47
Q

How long do AC compressors typically last in your area?

A
  1. 8 to 10 years-southern USA
  2. 10 to 15 years-moderate climates
  3. 15 to 20 years-northern climates
48
Q

What is the typical warranty period for a compressor?

A

5 years typically

49
Q

Heat pumps are generally sized based on the:
a. heating load
b. cooling load
c. other

A

cooling load

50
Q

The implication of an oversized heat pump during summer months is:

A

It would cool the house down too fast without dehumidifying the air, resulting in a cool, damp environment

51
Q

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

A

65 degrees F

52
Q

You should not operate the heat pump in the cooling mode when the outdoor temperature is below__

A

65 degrees F

53
Q

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

A
  1. data plate may say “HP” or Heat Pump
  2. Thermostat has an emergency heat setting
  3. both refrigerant lines are insulated
  4. presence of a reversing valve
  5. compressor is indoors & its
    ‘s an air-to-air system
  6. presence of an outdoor thermostat connected to control wiring
  7. If it is winter & the unit is operating, it’s a heat pump
  8. You find a two-stage thermostat
  9. You find 2 expansion devices

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