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Residential Air Conditioning

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What is the design boiling point for most evaporator coils in residential air conditioning?
Suction
TXV
140 degrees F
40 degrees F

2. Where do you check the amps on a motor?
2
Negative
High
On the common terminal

3. What can cause a decrease in suction pressure on an air-conditioning system?
With an are rating
2
A dirty evaporator
SEER includes the energy used in the start-up and shut-down cycles

4. 10 SEER is classified as what kind of efficiency?
Standard
A swaging tool
100 psig
Average feet per minute X area in square feet (H' x W'/144)

5. What sort of pressure will a pull-through evaporator have?
Negative
To lower the amount of pressure drop through the coil
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
1/4'

6. The A/C size is calculated by what?
To lower the amount of pressure drop through the coil
With a minimum of three evenly spaced self-tapping screws
Yes
Heat load

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

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8. How is ACR tubing sized?
Nitrogen with a small amount of refrigerant
Outside diameter (OD)
Boil the liquid refrigerant out ot the oil within the crankcase
It rises

9. How do you calculate LRA?
SEER includes the energy used in the start-up and shut-down cycles
RLA/FLA x 5
Yes
18 gauge

10. How many amps can 8 g wire handle?
40 A
A piston type metering device
L-type
A band 4 inches or more in width

11. If the rpm's are 750 - how many poles does the motor have?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
45-55%
25-ft or 50-ft
8

12. What tool is used to expand the diameter of soft copper tubing
It rises
Positive
A swaging tool
40 A

13. Superheat should never be below how many degrees
Over/under and side by side
Latent and sensible
It will have a decrease in superheat
5 degrees

14. The load on the evaporater will effect which pressure?
Yes
No
Suction
It will be high

15. If the rpm's are 3450 - how many poles does the motor have?
Average feet per minute X area in square feet (H' x W'/144)
100 psig
2
Individual return air systems and central return air systems

16. The fan switch closes at what temperature?
Before the vent
140 degrees F
Vapor
400

17. At what temperature does refrigerant condense in a high-efficiency unit?
8
200
In series
20 degrees above ambient

18. What are the components of a hard-start kit?
6
Potential relay and start capacitor
150
4

19. How long should you leave a system off once you kill power before restarting it?
They are physically larger
Yes
Negative
2 minutes

20. What are the two types of blower drives?
The takeoff fitting
30-35 degrees above ambient
Belt drive and direct drive
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

21. How many amps can 14 g wire handle?
40 degrees F
Pi x radius squared
Suction
15 A

22. How are the condenser coils different on a high-efficiency unit?
A swaging tool
They are larger
Any amount
With 4' saddles

23. 6' round duct has a ballpark cfm of what?
100
It rises
Positive
Staples and tape

24. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Pistons
30-35 degrees above ambient
Any amount
30 A

25. At what temperature will soft solder melt?
Side-by-side and over-and-under
False
Below 800 degrees F
No

26. Which is more efficient - a TXV or a fixed-orifice metering device?
5 degrees
TXV
18 gauge
1/4'

27. What are normal conditions - as defined by the ARI.
ACR (air-conditioning refrigeration) tubing
Yes
30 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

28. In what state is the refrigerant in the compressor?
20 degrees F
Potential relay and start capacitor
Slugging
Vapor

29. How is the high pressure switch wired with the low pressure switch?
Pi x radius squared
Heat loss
No
In parallel

30. What is a package unit?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
ACR (air-conditioning refrigeration) tubing
With a minimum of three evenly spaced self-tapping screws
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

31. What is considered normal operating conditions?
SEER includes the energy used in the start-up and shut-down cycles
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
20 degrees F
Nitrogen with a small amount of refrigerant

32. What can cause a decrease in suction pressure on an air-conditioning system?
400
A dirty evaporator
40 degrees F
30 A

33. If the rpm's are 1050 - how many poles does the motor have?
15% silphos
6
True
In parallel

34. How do you calculate EER?
200
Btu/hr (output) / wattage (input)
Shorted winding - open winding - and grounded winding
100 psig

35. How many amps can 10 g wire handle?
Yes
Yes
30 A
Indoor fan motor - outdoor fan motor - and the compressor

36. What are normal conditions - as defined by the ARI.
Staples and tape
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Potential relay and start capacitor
15 A

37. At what temperature does refrigerant condense in a high-efficiency unit?
Btu/hr (output) / wattage (input)
20 degrees above ambient
It will have a decrease in superheat
5 degrees

38. The evaporator is designed to remove what two types of heat?
S-clips and drives (cleats)
A dirty evaporator
30-35 degrees above ambient
Latent and sensible

39. The fan switch opens at what temperature?
Heat load
105 degrees F
By increasing the surface of the condenser coil
Side-by-side and over-and-under

40. What component changes refrigerant from a low pressure gas to a high pressure gas?
It will have a decrease in superheat
Compressor
With 4' saddles
Subtract ambient temperature from 100

41. Where do you install a trap on a drain line?
A band 4 inches or more in width
Rise
Negative
Before the vent

42. What percentage silver do you need to use for an are-410 system?
15% silphos
Negative
150
Outside of the male fitting

43. The load on the evaporater will effect which pressure?
Suction
Individual return air systems and central return air systems
When it is a pull-through evaporator
RLA/FLA x 5

44. If pressure rises - what happens to the superheat?
A swaging tool
It rises
30 degrees F
They are larger

45. On what terminal do you check amperage?
Common
Infiltration and ventilation
2 minutes
Inclined manometer

46. What are the two basic duct connection configurations for package units supply and return air ducts?
Btu/hr (output) / wattage (input)
Pull a vacuum
Over/under and side by side
40 A

47. How is nominal-sized tubing sized?
ACR (air-conditioning refrigeration) tubing
100 psig
Inside diameter (ID)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

48. How many amps can 8 g wire handle?
L-type
No
40 A
Common

49. What is the normal evaporator temperature?
Dehydrated with caps on each end
45 degrees F
Average feet per minute X area in square feet (H' x W'/144)
200

50. How many cfm per ton?
True
Boil the liquid refrigerant out ot the oil within the crankcase
5 degrees
400

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Residential Air Conditioning

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