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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 range for normal superheat and subcooling?
20 A
8-12 degrees F
150
Yes

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

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3. How is the high pressure switch wired with the low pressure switch?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
In parallel
40 degrees F
L-type

4. How is flexible duct supported?
Blended refrigerants
40 degrees F
A band 4 inches or more in width
Yes

5. Does a package unit come from the factory pre-charged?
4
Yes
5 degrees
15% silphos

6. What are the two functions of the air-conditioning system?
Heat loss
Nitrogen with a small amount of refrigerant
To remove humidity and lower dry bulb temperature
In parallel

7. How will too much refrigerant effect superheat?
It will be low
It will be high
2
Boil the liquid refrigerant out ot the oil within the crankcase

8. What gauge is thermostat wire?
Yes
300
Blended refrigerants
18 gauge

9. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Heat loss
12000
False

10. How is nominal-sized tubing sized?
No
Inside diameter (ID)
15 A
Suction

11. How many amps can 10 g wire handle?
Duct - electrical - and mechanical
S-clips and drives (cleats)
It will have a decrease in superheat
30 A

12. What are the two basic duct connection configurations for package units supply and return air ducts?
Boil the liquid refrigerant out ot the oil within the crankcase
Infiltration and ventilation
20 degrees F
Over/under and side by side

13. What component changes refrigerant from a low pressure gas to a high pressure gas?
Yes
Yes
Compressor
In parallel

14. What is the typical pressure differance across a TXV?
When it is a pull-through evaporator
Inclined manometer
100 psig
Pi x radius squared

15. What distributes supply air to a room in a structure?
TXV
100 psig
Outside of the male fitting
A diffuser

16. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
The takeoff fitting
Yes
They are physically larger

17. What sort of pressure will a push-through evaporator have?
With a minimum of three evenly spaced self-tapping screws
When the system is under pressure
4
Positive

18. What are the three major power-consuming devices on an air-conditioning system?
30 A
Below 800 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
Inches of water column (in. WC)

19. What are the four materials used to make duct?
Pull a vacuum
Average feet per minute X area in square feet (H' x W'/144)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
45 degrees F

20. What are the components of a hard-start kit?
Vapor
100 psig
ACR (air-conditioning refrigeration) tubing
Potential relay and start capacitor

21. What kind of metering device do high-efficiency units usually use?
1/4'
12000
Slugging
TXV

22. Do you need a vent on a push-through evaporator?
Yes
100
400
25-ft or 50-ft

23. Most duct insulation is made of what?
To remove humidity and lower dry bulb temperature
Yes
Inclined manometer
Fiberglass

24. What is considered normal operating conditions?
20 degrees F
A diffuser
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
With a minimum of three evenly spaced self-tapping screws

25. 8' round duct has a ballpark cfm of what?
Belt drive and direct drive
200
No
45-55%

26. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
15% silphos
45-55%
Average feet per minute X area in square feet (H' x W'/144)
It will be low

27. Where do you check the amps on a motor?
Duct with insulation on the inside
Yes
On the common terminal
45-55%

28. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
They are larger
150
Yes

29. How many amps can 8 g wire handle?
Infiltration and ventilation
40 A
Pistons
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

30. What percentage silver do you need to use for an are-410 system?
15% silphos
Individual return air systems and central return air systems
The takeoff fitting
Nominal-sized tubing

31. If pressure rises - what happens to the superheat?
They are physically larger
It rises
Pull a vacuum
To lower the amount of pressure drop through the coil

32. What kind of refrigeratnts must be added in liquid form?
Static pressure - velocity pressure - and total pressure
Blended refrigerants
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
15% silphos

33. What are the components of a hard-start kit?
12000
To lower the amount of pressure drop through the coil
Potential relay and start capacitor
TXV

34. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Over/under and side by side
Nitrogen with a small amount of refrigerant
A dirty evaporator

35. What is the typical pressure differance across a TXV?
Shorted winding - open winding - and grounded winding
Side-by-side and over-and-under
100 psig
Dehydrated with caps on each end

36. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
A band 4 inches or more in width
A bypass duct or a dump zone
ACR (air-conditioning refrigeration) tubing

37. How are round ducts connected to one another?
45-55%
With a minimum of three evenly spaced self-tapping screws
Indoor fan motor - outdoor fan motor - and the compressor
12000

38. Do you need a vent on a push-through evaporator?
Pistons
2 minutes
Yes
Stranded

39. 6' round duct has a ballpark cfm of what?
Inches of water column (in. WC)
100
1/4'
Shorted winding - open winding - and grounded winding

40. The A/C size is calculated by what?
40 A
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Belt drive and direct drive
Heat load

41. Can refrigerant line sets be altered in length?
It also rises
Yes
1/4'
By increasing the surface of the condenser coil

42. How is ACR tubing sized?
Outside diameter (OD)
When it is a pull-through evaporator
TXV
Rise

43. Sections of duct board can be fastened together with what?
5 degrees
Pull a vacuum
Staples and tape
Suction

44. At what temperature will soft solder melt?
Over/under and side by side
Average feet per minute X area in square feet (H' x W'/144)
Below 800 degrees F
20 degrees F

45. The evaporator is designed to remove what two types of heat?
TXV
Btu/hr (output) / wattage (input)
Standard
Latent and sensible

46. How are round ducts supported?

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47. How do you achieve high-efficiency?
8-12 degrees F
12000
By increasing the surface of the condenser coil
Before the vent

48. What are the three pressures created by moving air in ductwork?
It will be low
Dehydrated with caps on each end
Static pressure - velocity pressure - and total pressure
It rises

49. What tool is used to expand the diameter of soft copper tubing
They are larger
A swaging tool
Heat load
A diffuser

50. Most duct insulation is made of what?
It will have a decrease in superheat
Fiberglass
Compressor
Pistons

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Residential Air Conditioning

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