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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 are the two types of return air systems in residential installations?
Before the vent
Standard
False
Individual return air systems and central return air systems

2. Do you need a trap on a push-through evaporator?
20 degrees above ambient
Latent and sensible
140 degrees F
No

3. Will a dirty condenser cause a rise or fall in pressure?
Compressor
False
Below 800 degrees F
Rise

4. What component changes refrigerant from a low pressure gas to a high pressure gas?
Infiltration and ventilation
SEER includes the energy used in the start-up and shut-down cycles
On the common terminal
Compressor

5. What type of air conditioning system must be charged using the superheat method?
Outside of the male fitting
A piston type metering device
Pi x radius squared
Btu/hr (output) / wattage (input)

6. Most duct insulation is made of what?
It will be low
Fiberglass
Pi x radius squared
Yes

7. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
They are larger
It will have a decrease in superheat

8. How is flexible duct supported?
A band 4 inches or more in width
15% silphos
Suction
Before the vent

9. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
Common
Nitrogen with a small amount of refrigerant
200

10. How is flexible duct supported?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Inclined manometer
Yes
A band 4 inches or more in width

11. The evaporator is designed to remove what two types of heat?
Latent and sensible
Over 800 degrees F
200
8-12 degrees F

12. How is nominal-sized tubing sized?
1/4'
Yes
Inside diameter (ID)
Boil the liquid refrigerant out ot the oil within the crankcase

13. What is the typical pressure differance across a TXV?
2 minutes
100 psig
A piston type metering device
Over 800 degrees F

14. What is the normal evaporator temperature?
When it is a pull-through evaporator
45 degrees F
ACR (air-conditioning refrigeration) tubing
25-ft or 50-ft

15. The evaporator is designed to remove what two types of heat?
Inclined manometer
Nitrogen with a small amount of refrigerant
Latent and sensible
4

16. What is the range for normal superheat and subcooling?
Pi x radius squared
8-12 degrees F
Yes
Nominal-sized tubing

17. What tool is used to expand the diameter of soft copper tubing
A swaging tool
100 psig
It will be low
Heat load

18. The load on the evaporater will effect which pressure?
Subtract ambient temperature from 100
Suction
Heat loss
Shorted winding - open winding - and grounded winding

19. What are the four materials used to make duct?
100 psig
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
8
S-clips and drives (cleats)

20. What sort of pressure will a pull-through evaporator have?
TXV
It will be low
Nitrogen with a small amount of refrigerant
Negative

21. How is the high pressure switch wired with the low pressure switch?
Average feet per minute X area in square feet (H' x W'/144)
A dirty evaporator
In parallel
40 degrees F

22. How long should you leave a system off once you kill power before restarting it?
100 psig
Standard
2 minutes
300

23. Does a package unit come from the factory pre-charged?
Outside diameter (OD)
150
Subtract ambient temperature from 100
Yes

24. How are the condenser coils different on a high-efficiency unit?
They are larger
Inside diameter (ID)
105 degrees F
150

25. What are the three crafts normally associated with an air-conditioned installation?
With 4' saddles
Over/under and side by side
Duct - electrical - and mechanical
140 degrees F

26. How will too much refrigerant effect subcooling?
It will be high
200
A swaging tool
8

27. How will too much refrigerant effect superheat?
It will be low
Latent and sensible
30 degrees F
6

28. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Yes
Any amount
6

29. The crankcase heater on an air-conditioning compressor is used to what?
By increasing the surface of the condenser coil
6
Boil the liquid refrigerant out ot the oil within the crankcase
False

30. 13 SEER is classified as what kind of efficiency?
100
High
Subtract ambient temperature from 100
False

31. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
8
Pull a vacuum
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

32. The furnace size is calculated by what?
Any amount
Heat loss
Outside of the male fitting
4

33. In what state is the refrigerant in the compressor?
30-35 degrees above ambient
Indoor fan motor - outdoor fan motor - and the compressor
Vapor
400

34. What tool is used to expand the diameter of soft copper tubing
Over 800 degrees F
A swaging tool
Nominal-sized tubing
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

35. In what length rolls is soft copper tubing normally available?
15% silphos
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
25-ft or 50-ft
6

36. What is the design boiling point for most evaporator coils in residential air conditioning?
Vapor
40 degrees F
Any amount
It will be high

37. How is the high pressure switch wired with the low pressure switch?
1/4'
Side-by-side and over-and-under
In parallel
Belt drive and direct drive

38. How does ACR copper pipe come?
Dehydrated with caps on each end
Fiberglass
On the common terminal
No

39. How is ACR tubing sized?
Any amount
Outside diameter (OD)
Yes
30-35 degrees above ambient

40. Sections of duct board can be fastened together with what?
Staples and tape
They are physically larger
False
When it is above a conditioned space

41. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
1/4'
A bypass duct or a dump zone
1/4'

42. How many BTU's per ton?
25-ft or 50-ft
100 psig
12000
RLA/FLA x 5

43. 8' round duct has a ballpark cfm of what?
To remove humidity and lower dry bulb temperature
100
Yes
200

44. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
In parallel
RLA/FLA x 5
A band 4 inches or more in width
20 degrees F

45. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
It also rises
Yes
Standard

46. What percentage silver do you need to use for an are-410 system?
It will have a decrease in superheat
Suction
6
15% silphos

47. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
200
Slugging
RLA/FLA x 5

48. Where do you check the amps on a motor?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Dehydrated with caps on each end
Infiltration and ventilation
On the common terminal

49. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
Inches of water column (in. WC)
It also rises
Btu/hr (output) / wattage (input)

50. What kind of refrigeratnts must be added in liquid form?
With a minimum of three evenly spaced self-tapping screws
Any amount
Blended refrigerants
25-ft or 50-ft

Can you answer 50 questions in 15 minutes?

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Residential Air Conditioning

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