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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 standard weight copper tubing is most often used in the heating and air-conditioning industry?
4
Yes
L-type
It will be high

2. 6' round duct has a ballpark cfm of what?
15% silphos
Indoor fan motor - outdoor fan motor - and the compressor
It will be high
100

3. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
20 A
S-clips and drives (cleats)
A swaging tool

4. What are the three pressures created by moving air in ductwork?
12000
Yes
Static pressure - velocity pressure - and total pressure
They are larger

5. The evaporator is designed to remove what two types of heat?
Latent and sensible
Inclined manometer
4
The takeoff fitting

6. What percentage silver do you need to use for an are-410 system?
Suction
SEER includes the energy used in the start-up and shut-down cycles
Btu/hr (output) / wattage (input)
15% silphos

7. Can refrigerant line sets be altered in length?
Duct with insulation on the inside
2 minutes
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

8. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
45-55%
With 4' saddles
In series
TXV

9. If the rpm's are 750 - how many poles does the motor have?
Outside diameter (OD)
It rises
8
Yes

10. How are round ducts connected to one another?
Blended refrigerants
A dirty evaporator
5 degrees
With a minimum of three evenly spaced self-tapping screws

11. If the rpm's are 1750 - how many poles does the motor have?
4
Before the vent
Below 800 degrees F
Slugging

12. What is it called when liquid refrigerant gets into the compressor?
Slugging
140 degrees F
Outside diameter (OD)
45-55%

13. How do you achieve high-efficiency?
4
30 A
By increasing the surface of the condenser coil
Belt drive and direct drive

14. Most duct insulation is made of what?
Stranded
30 A
20 degrees above ambient
Fiberglass

15. What type of air conditioning system must be charged using the superheat method?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Inches of water column (in. WC)
2
A piston type metering device

16. The crankcase heater on an air-conditioning compressor is used to what?
With 4' saddles
Negative
Boil the liquid refrigerant out ot the oil within the crankcase
Slugging

17. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
45 degrees F
Any amount
20 degrees F
Potential relay and start capacitor

18. Does a package unit come from the factory pre-charged?
Shorted winding - open winding - and grounded winding
Yes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Duct - electrical - and mechanical

19. What sort of pressure will a pull-through evaporator have?
Infiltration and ventilation
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
When it is a pull-through evaporator
Negative

20. What are the three ways a motor can fail electrically?
Heat loss
Shorted winding - open winding - and grounded winding
4
140 degrees F

21. 9' round duct has a ballpark cfm of what?
Nitrogen with a small amount of refrigerant
Potential relay and start capacitor
300
Static pressure - velocity pressure - and total pressure

22. On what terminal do you check amperage?
105 degrees F
ACR (air-conditioning refrigeration) tubing
Nitrogen with a small amount of refrigerant
Common

23. 10 SEER is classified as what kind of efficiency?
100 psig
Yes
A dirty evaporator
Standard

24. What component changes refrigerant from a low pressure gas to a high pressure gas?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Compressor
Average feet per minute X area in square feet (H' x W'/144)

25. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
With 4' saddles
Rise
On the common terminal
True

26. How are round ducts supported?

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27. How many amps can 14 g wire handle?
To lower the amount of pressure drop through the coil
A band 4 inches or more in width
When the system is under pressure
15 A

28. Sections of duct board can be fastened together with what?
On the common terminal
ACR (air-conditioning refrigeration) tubing
Rise
Staples and tape

29. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
Nominal-sized tubing
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Fiberglass

30. What are the two types of package units?
ACR (air-conditioning refrigeration) tubing
Side-by-side and over-and-under
Before the vent
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

31. Where do you check the amps on a motor?
On the common terminal
It will be low
Yes
Heat loss

32. The A/C size is calculated by what?
They are physically larger
30 degrees F
Heat load
Inches of water column (in. WC)

33. At what temperature does refrigerant condense in a high-efficiency unit?
20 degrees above ambient
Over 800 degrees F
Yes
15 A

34. The A/C size is calculated by what?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
When it is a pull-through evaporator
Stranded
Heat load

35. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
Yes
TXV
18 gauge

36. What kind of refrigeratnts must be added in liquid form?
1/4'
45-55%
Blended refrigerants
15% silphos

37. Do you need a vent on a push-through evaporator?
15 A
Negative
Yes
Inside diameter (ID)

38. How will too much refrigerant effect superheat?
It will be low
Pull a vacuum
Inches of water column (in. WC)
45-55%

39. 7' round duct has a ballpark cfm of what?
They are larger
Belt drive and direct drive
Side-by-side and over-and-under
150

40. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Btu/hr (output) / wattage (input)
ACR (air-conditioning refrigeration) tubing
Subtract ambient temperature from 100

41. What is the difference between SEER and EER?
12000
Fiberglass
Stranded
SEER includes the energy used in the start-up and shut-down cycles

42. What percentage silver do you need to use for an are-410 system?
15% silphos
Outside of the male fitting
A bypass duct or a dump zone
12000

43. When must a copper joint never be soldered or brazed?
The takeoff fitting
With an are rating
A piston type metering device
When the system is under pressure

44. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
SEER includes the energy used in the start-up and shut-down cycles
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
30-35 degrees above ambient

45. What is the name of the fitting where the branch line leaves the duct?
100 psig
40 degrees F
The takeoff fitting
Subtract ambient temperature from 100

46. What are the two types of return air systems in residential installations?
Indoor fan motor - outdoor fan motor - and the compressor
40 degrees F
Yes
Individual return air systems and central return air systems

47. Do you need a trap on a pull-through evaporator?
140 degrees F
A band 4 inches or more in width
300
Yes

48. What kind of copper tubing is used for refrigeration or air-conditioning applications?
8-12 degrees F
ACR (air-conditioning refrigeration) tubing
Inches of water column (in. WC)
Yes

49. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
20 degrees F
Side-by-side and over-and-under
8

50. How do you calculate the area of a circle?
45-55%
The suction line or the low-pressure side
Pi x radius squared
In parallel

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Residential Air Conditioning

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