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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
Slugging
Compressor
By increasing the surface of the condenser coil

2. What do you use to check for leaks?
Heat loss
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Nitrogen with a small amount of refrigerant
Static pressure - velocity pressure - and total pressure

3. Which is more efficient - a TXV or a fixed-orifice metering device?
Inside diameter (ID)
30-35 degrees above ambient
15 A
TXV

4. In what length rolls is soft copper tubing normally available?
Indoor fan motor - outdoor fan motor - and the compressor
ACR (air-conditioning refrigeration) tubing
25-ft or 50-ft
To lower the amount of pressure drop through the coil

5. What gauge is thermostat wire?
ACR (air-conditioning refrigeration) tubing
18 gauge
40 degrees F
100

6. What is the difference between SEER and EER?
Subtract ambient temperature from 100
40 A
Any amount
SEER includes the energy used in the start-up and shut-down cycles

7. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Fiberglass
20 degrees F
Stranded
Before the vent

8. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
A piston type metering device
12000

9. If the suction pressure rises - what happens to the head pressure?
SEER includes the energy used in the start-up and shut-down cycles
It also rises
Heat load
30 degrees F

10. Can refrigerant line sets be altered in length?
It will be high
Yes
Subtract ambient temperature from 100
20 degrees above ambient

11. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Pi x radius squared
45 degrees F
ACR (air-conditioning refrigeration) tubing
15 A

12. If the rpm's are 1750 - how many poles does the motor have?
Duct with insulation on the inside
In series
4
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

13. What are the two types of blower drives?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Belt drive and direct drive
TXV
SEER includes the energy used in the start-up and shut-down cycles

14. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
It also rises
Yes
Indoor fan motor - outdoor fan motor - and the compressor

15. Will a dirty condenser cause a rise or fall in pressure?
ACR (air-conditioning refrigeration) tubing
20 degrees above ambient
Rise
Average feet per minute X area in square feet (H' x W'/144)

16. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Indoor fan motor - outdoor fan motor - and the compressor
40 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

17. The A/C size is calculated by what?
105 degrees F
Side-by-side and over-and-under
Heat load
Individual return air systems and central return air systems

18. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
105 degrees F
With 4' saddles
Below 800 degrees F

19. How does ACR copper pipe come?
High
They are larger
Dehydrated with caps on each end
Side-by-side and over-and-under

20. What is used to measure static air pressure in ducts.
Inclined manometer
Slugging
100 psig
45 degrees F

21. 9' round duct has a ballpark cfm of what?
A band 4 inches or more in width
Any amount
300
When it is a pull-through evaporator

22. What are the components of a hard-start kit?
Standard
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Potential relay and start capacitor
40 degrees F

23. How do you calculate EER?
Btu/hr (output) / wattage (input)
A bypass duct or a dump zone
ACR (air-conditioning refrigeration) tubing
A band 4 inches or more in width

24. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
To remove humidity and lower dry bulb temperature
They are larger
Any amount
Side-by-side and over-and-under

25. Superheat should never be below how many degrees
With 4' saddles
Latent and sensible
Inside diameter (ID)
5 degrees

26. What kind of copper tubing is used for plumbing and heating applications?
It also rises
Nominal-sized tubing
The suction line or the low-pressure side
A swaging tool

27. The furnace size is calculated by what?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Individual return air systems and central return air systems
The suction line or the low-pressure side
Heat loss

28. How many amps can 10 g wire handle?
Yes
In series
30 A
20 degrees F

29. How is the high pressure switch wired with the low pressure switch?
Heat loss
12000
Blended refrigerants
In parallel

30. How many amps can 12 g wire handle?
Boil the liquid refrigerant out ot the oil within the crankcase
On the common terminal
Fiberglass
20 A

31. What are the three ways a motor can fail electrically?
Blended refrigerants
Shorted winding - open winding - and grounded winding
Before the vent
Inclined manometer

32. Do you need a trap on a pull-through evaporator?
200
Slugging
Yes
Boil the liquid refrigerant out ot the oil within the crankcase

33. Most duct insulation is made of what?
A diffuser
False
Fiberglass
True

34. What is it called when liquid refrigerant gets into the compressor?
40 degrees F
It will be low
20 degrees F
Slugging

35. How much does a drain line need to drop per foot of length?

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36. At what temperature will brazing melt?
4
Average feet per minute X area in square feet (H' x W'/144)
40 A
Over 800 degrees F

37. What is the name of the fitting where the branch line leaves the duct?
Infiltration and ventilation
Over/under and side by side
15 A
The takeoff fitting

38. The fan switch closes at what temperature?
140 degrees F
RLA/FLA x 5
A dirty evaporator
40 degrees F

39. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Suction
To lower the amount of pressure drop through the coil
12000
Compressor

40. What distributes supply air to a room in a structure?
Indoor fan motor - outdoor fan motor - and the compressor
Fiberglass
5 degrees
A diffuser

41. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
100
A diffuser
Common

42. What sort of pressure will a push-through evaporator have?
Average feet per minute X area in square feet (H' x W'/144)
It will have a decrease in superheat
Positive
30 A

43. At what temperature does refrigerant condense in a standard-efficiency unit?
15 A
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
30-35 degrees above ambient
2 minutes

44. What are the two ways that fresh air enters a structure?
By increasing the surface of the condenser coil
Infiltration and ventilation
30-35 degrees above ambient
Inside diameter (ID)

45. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Pull a vacuum
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
No

46. When do you install a trap on a drain line?
105 degrees F
Below 800 degrees F
When it is a pull-through evaporator
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

47. The fan switch opens at what temperature?
The takeoff fitting
Average feet per minute X area in square feet (H' x W'/144)
A piston type metering device
105 degrees F

48. If pressure rises - what happens to the superheat?
5 degrees
It rises
100 psig
Average feet per minute X area in square feet (H' x W'/144)

49. How is insulation around a duct rated?
With an are rating
A bypass duct or a dump zone
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Nitrogen with a small amount of refrigerant

50. Do you need a trap on a pull-through evaporator?
Belt drive and direct drive
Staples and tape
Pull a vacuum
Yes