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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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1. What are the three ways a motor can fail electrically?
It will be low
30 degrees F
Duct with insulation on the inside
Shorted winding - open winding - and grounded winding

2. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
45-55%
A diffuser
Heat load

3. At what temperature does refrigerant condense in a high-efficiency unit?
Below 800 degrees F
20 degrees above ambient
Outside of the male fitting
Average feet per minute X area in square feet (H' x W'/144)

4. 6' round duct has a ballpark cfm of what?
30 degrees F
100
Before the vent
With a minimum of three evenly spaced self-tapping screws

5. What kind of copper tubing is used for plumbing and heating applications?
When it is above a conditioned space
Compressor
Nominal-sized tubing
Potential relay and start capacitor

6. The A/C size is calculated by what?
1/4'
15% silphos
Btu/hr (output) / wattage (input)
Heat load

7. Which type of wire can handle a higher ampacity?
8
100
Stranded
Pistons

8. How many amps can 8 g wire handle?
Outside diameter (OD)
40 A
Yes
Over 800 degrees F

9. The evaporator is designed to remove what two types of heat?
300
Average feet per minute X area in square feet (H' x W'/144)
Latent and sensible
SEER includes the energy used in the start-up and shut-down cycles

10. What is it called when liquid refrigerant gets into the compressor?
30 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Slugging
20 A

11. How long should you leave a system off once you kill power before restarting it?
40 A
Inclined manometer
2 minutes
45-55%

12. Will a dirty condenser cause a rise or fall in pressure?
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
Rise
20 degrees above ambient

13. At what temperature does refrigerant condense in a standard-efficiency unit?
Vapor
On the common terminal
30-35 degrees above ambient
In series

14. What is lined duct?
Potential relay and start capacitor
45-55%
Duct with insulation on the inside
Yes

15. What is it called when liquid refrigerant gets into the compressor?
8
Outside diameter (OD)
Belt drive and direct drive
Slugging

16. What is the range for normal superheat and subcooling?
2 minutes
Inside diameter (ID)
8-12 degrees F
Outside diameter (OD)

17. How do you calculate cfm?

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18. At what temperature will brazing melt?
Over 800 degrees F
12000
Stranded
A bypass duct or a dump zone

19. How will too much refrigerant effect superheat?
12000
Negative
It will be low
Average feet per minute X area in square feet (H' x W'/144)

20. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
They are physically larger
L-type
40 degrees F
Duct - electrical - and mechanical

21. What is the typical pressure differance across a TXV?
Indoor fan motor - outdoor fan motor - and the compressor
Outside diameter (OD)
When the system is under pressure
100 psig

22. What are the two ways that fresh air enters a structure?
Nominal-sized tubing
Infiltration and ventilation
Heat loss
True

23. Where do you apply flux when soldering?
Outside of the male fitting
Heat loss
The suction line or the low-pressure side
Pull a vacuum

24. How is ACR tubing sized?
Rise
Yes
Outside diameter (OD)
20 degrees above ambient

25. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
To lower the amount of pressure drop through the coil
Nitrogen with a small amount of refrigerant
A diffuser

26. What are the two types of package units?
Below 800 degrees F
8-12 degrees F
Static pressure - velocity pressure - and total pressure
Side-by-side and over-and-under

27. Do you need a trap on a pull-through evaporator?
A swaging tool
L-type
Yes
A dirty evaporator

28. Where is insulation used on copper tubing used for air-conditioning?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
The suction line or the low-pressure side
Heat loss

29. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
RLA/FLA x 5
300
Heat load

30. How is nominal-sized tubing sized?
Inside diameter (ID)
45-55%
6
15 A

31. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
Btu/hr (output) / wattage (input)
18 gauge
Rise

32. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
40 degrees F
RLA/FLA x 5
20 degrees F
A piston type metering device

33. In what length rolls is soft copper tubing normally available?
100
20 A
25-ft or 50-ft
It rises

34. What percentage silver do you need to use for an are-410 system?
40 A
Shorted winding - open winding - and grounded winding
Outside diameter (OD)
15% silphos

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

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36. What are the three major power-consuming devices on an air-conditioning system?
Yes
A dirty evaporator
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Indoor fan motor - outdoor fan motor - and the compressor

37. At what temperature will brazing melt?
The takeoff fitting
200
Common
Over 800 degrees F

38. What kind of copper tubing is used for refrigeration or air-conditioning applications?
A swaging tool
ACR (air-conditioning refrigeration) tubing
Duct with insulation on the inside
400

39. Superheat should never be below how many degrees
140 degrees F
15% silphos
Pistons
5 degrees

40. How are the condenser coils different on a high-efficiency unit?
Any amount
They are larger
40 A
12000

41. On what terminal do you check amperage?
Yes
Common
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

42. How do you achieve high-efficiency?
Below 800 degrees F
Inclined manometer
L-type
By increasing the surface of the condenser coil

43. What are the three pressures created by moving air in ductwork?
Belt drive and direct drive
A dirty evaporator
Static pressure - velocity pressure - and total pressure
When it is a pull-through evaporator

44. What type of air conditioning system must be charged using the superheat method?
100 psig
A piston type metering device
Inclined manometer
30 A

45. What tool is used to expand the diameter of soft copper tubing
A swaging tool
Compressor
Below 800 degrees F
20 A

46. How is ACR tubing sized?
45-55%
Outside diameter (OD)
To lower the amount of pressure drop through the coil
Nitrogen with a small amount of refrigerant

47. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
RLA/FLA x 5
Btu/hr (output) / wattage (input)
High
30 degrees F

48. What is used to measure static air pressure in ducts.
Shorted winding - open winding - and grounded winding
2 minutes
Inclined manometer
Static pressure - velocity pressure - and total pressure

49. If the rpm's are 750 - how many poles does the motor have?
Yes
With an are rating
Fiberglass
8

50. How do you calculate LRA?
False
Side-by-side and over-and-under
RLA/FLA x 5
A bypass duct or a dump zone

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Residential Air Conditioning

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