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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. In what length rolls is soft copper tubing normally available?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
25-ft or 50-ft
2 minutes
When the system is under pressure

2. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Negative
2
Pull a vacuum
30 degrees F

3. What is the range for normal superheat and subcooling?
8-12 degrees F
Stranded
No
200

4. What distributes supply air to a room in a structure?
30 degrees F
20 A
Belt drive and direct drive
A diffuser

5. How do you calculate LRA?
RLA/FLA x 5
It will have a decrease in superheat
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
With an are rating

6. What is considered normal operating conditions?
In series
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Inclined manometer
It will have a decrease in superheat

7. Why are some ACR tubing lines insulated?
Over/under and side by side
ACR (air-conditioning refrigeration) tubing
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
TXV

8. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Blended refrigerants
Positive
A diffuser

9. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Over 800 degrees F
True
Vapor
45 degrees F

10. What is the typical pressure differance across a TXV?
100 psig
4
Blended refrigerants
20 degrees above ambient

11. In what length rolls is soft copper tubing normally available?
18 gauge
Subtract ambient temperature from 100
To remove humidity and lower dry bulb temperature
25-ft or 50-ft

12. What is lined duct?
6
Duct with insulation on the inside
Inside diameter (ID)
Pistons

13. At what temperature does refrigerant condense in a standard-efficiency unit?
45 degrees F
Yes
Negative
30-35 degrees above ambient

14. What tool is used to expand the diameter of soft copper tubing
In parallel
Yes
A swaging tool
Yes

15. What are the two types of package units?
It also rises
Side-by-side and over-and-under
8
To remove humidity and lower dry bulb temperature

16. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In parallel
Nitrogen with a small amount of refrigerant
In series
Yes

17. At what temperature will brazing melt?
False
Inside diameter (ID)
Latent and sensible
Over 800 degrees F

18. At what temperature will soft solder melt?
Suction
Side-by-side and over-and-under
RLA/FLA x 5
Below 800 degrees F

19. How is nominal-sized tubing sized?
On the common terminal
No
200
Inside diameter (ID)

20. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Vapor
In parallel
It will be high
Any amount

21. What kind of copper tubing is used for plumbing and heating applications?
Heat load
Below 800 degrees F
A bypass duct or a dump zone
Nominal-sized tubing

22. How are round ducts connected to one another?
Pistons
Over 800 degrees F
2 minutes
With a minimum of three evenly spaced self-tapping screws

23. On what terminal do you check amperage?
It also rises
400
Common
Yes

24. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Belt drive and direct drive
100 psig
20 degrees F
Outside diameter (OD)

25. What are normal conditions - as defined by the ARI.
A swaging tool
It will be low
100
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

26. Superheat should never be below how many degrees
A dirty evaporator
In series
5 degrees
45 degrees F

27. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Shorted winding - open winding - and grounded winding
Inside diameter (ID)
In series
Pistons

28. What is the normal evaporator temperature?
45 degrees F
Dehydrated with caps on each end
Blended refrigerants
200

29. Which is more efficient - a TXV or a fixed-orifice metering device?
4
Average feet per minute X area in square feet (H' x W'/144)
TXV
Infiltration and ventilation

30. What are the three ways a motor can fail electrically?
Side-by-side and over-and-under
Shorted winding - open winding - and grounded winding
In series
Infiltration and ventilation

31. At what temperature will soft solder melt?
Below 800 degrees F
RLA/FLA x 5
Any amount
On the common terminal

32. Will a dirty condenser cause a rise or fall in pressure?
1/4'
Rise
Standard
Indoor fan motor - outdoor fan motor - and the compressor

33. What is lined duct?
Duct with insulation on the inside
It will be high
4
Standard

34. What type of air conditioning system must be charged using the superheat method?
Btu/hr (output) / wattage (input)
A piston type metering device
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Nominal-sized tubing

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

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36. The evaporator is designed to remove what two types of heat?
A swaging tool
Latent and sensible
30 degrees F
False

37. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
By increasing the surface of the condenser coil
8-12 degrees F
4

38. What type of air conditioning system must be charged using the superheat method?
Yes
A piston type metering device
2 minutes
6

39. How is flexible duct supported?
400
Indoor fan motor - outdoor fan motor - and the compressor
A band 4 inches or more in width
In series

40. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
With 4' saddles
18 gauge
30 A

41. Sections of duct board can be fastened together with what?
A diffuser
TXV
Staples and tape
Inside diameter (ID)

42. 10 SEER is classified as what kind of efficiency?
Nominal-sized tubing
200
Standard
20 degrees above ambient

43. What are the two types of blower drives?
Dehydrated with caps on each end
Negative
RLA/FLA x 5
Belt drive and direct drive

44. What is a package unit?
TXV
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When it is a pull-through evaporator
20 degrees above ambient

45. How do you calculate the area of a circle?
Pi x radius squared
200
Individual return air systems and central return air systems
Duct - electrical - and mechanical

46. What are the two basic duct connection configurations for package units supply and return air ducts?
30-35 degrees above ambient
Over/under and side by side
Heat loss
8-12 degrees F

47. Can refrigerant line sets be altered in length?
Yes
Duct - electrical - and mechanical
40 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase

48. What component changes refrigerant from a low pressure gas to a high pressure gas?
1/4'
When it is a pull-through evaporator
Compressor
15% silphos

49. How are round ducts supported?

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50. How many amps can 12 g wire handle?
400
ACR (air-conditioning refrigeration) tubing
20 A
Dehydrated with caps on each end

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Residential Air Conditioning

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