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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. A reciprocating compressor has what sort of moving parts?
In parallel
40 degrees F
Pistons
Inclined manometer

2. If the suction pressure rises - what happens to the head pressure?
It also rises
1/4'
Over/under and side by side
18 gauge

3. How is nominal-sized tubing sized?
Inside diameter (ID)
A piston type metering device
30 A
Side-by-side and over-and-under

4. The A/C size is calculated by what?
Infiltration and ventilation
Heat load
20 degrees F
105 degrees F

5. How are round ducts supported?

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6. The furnace size is calculated by what?
Common
Heat loss
A piston type metering device
SEER includes the energy used in the start-up and shut-down cycles

7. What kind of refrigeratnts must be added in liquid form?
In series
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
Heat loss

8. What is the typical pressure differance across a TXV?
It rises
100 psig
TXV
Any amount

9. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Compressor
A bypass duct or a dump zone
They are physically larger
Inclined manometer

10. If pressure rises - what happens to the superheat?
It rises
Static pressure - velocity pressure - and total pressure
Standard
2 minutes

11. If the rpm's are 3450 - how many poles does the motor have?
2
Boil the liquid refrigerant out ot the oil within the crankcase
On the common terminal
SEER includes the energy used in the start-up and shut-down cycles

12. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Slugging
Blended refrigerants
To lower the amount of pressure drop through the coil

13. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
In parallel
Btu/hr (output) / wattage (input)
20 degrees above ambient

14. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
They are larger
8
L-type
Btu/hr (output) / wattage (input)

15. How is insulation around a duct rated?
The takeoff fitting
Slugging
It rises
With an are rating

16. Where do you check the amps on a motor?
On the common terminal
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
4
20 degrees above ambient

17. What do you use to connect square and rectangular ductboard together?
S-clips and drives (cleats)
150
By increasing the surface of the condenser coil
Boil the liquid refrigerant out ot the oil within the crankcase

18. What is the normal evaporator temperature?
Any amount
By increasing the surface of the condenser coil
45 degrees F
With 4' saddles

19. What is lined duct?
Duct with insulation on the inside
Pistons
The takeoff fitting
Heat load

20. What do you use to check for leaks?
A swaging tool
A bypass duct or a dump zone
Nitrogen with a small amount of refrigerant
S-clips and drives (cleats)

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

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22. Will a dirty condenser cause a rise or fall in pressure?
A band 4 inches or more in width
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A swaging tool
Rise

23. Sections of duct board can be fastened together with what?
With a minimum of three evenly spaced self-tapping screws
Inside diameter (ID)
Staples and tape
45 degrees F

24. What is it called when liquid refrigerant gets into the compressor?
False
Indoor fan motor - outdoor fan motor - and the compressor
Slugging
105 degrees F

25. How do you achieve high-efficiency?
The takeoff fitting
300
8-12 degrees F
By increasing the surface of the condenser coil

26. Superheat should never be below how many degrees
5 degrees
Indoor fan motor - outdoor fan motor - and the compressor
Stranded
8

27. What type of air conditioning system must be charged using the superheat method?
Rise
A piston type metering device
Latent and sensible
By increasing the surface of the condenser coil

28. What is the difference between SEER and EER?
Any amount
It also rises
SEER includes the energy used in the start-up and shut-down cycles
45 degrees F

29. What component changes refrigerant from a low pressure gas to a high pressure gas?
8
No
A piston type metering device
Compressor

30. What are the two types of package units?
Side-by-side and over-and-under
100
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It rises

31. How many amps can 14 g wire handle?
40 degrees F
Negative
TXV
15 A

32. If the rpm's are 750 - how many poles does the motor have?
8
Common
Common
The suction line or the low-pressure side

33. At what temperature will soft solder melt?
18 gauge
It will be high
Below 800 degrees F
With a minimum of three evenly spaced self-tapping screws

34. Do you need a trap on a push-through evaporator?
Outside of the male fitting
With a minimum of three evenly spaced self-tapping screws
No
Heat load

35. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
A piston type metering device
300
100 psig

36. What do you use to connect square and rectangular ductboard together?
High
A band 4 inches or more in width
S-clips and drives (cleats)
Shorted winding - open winding - and grounded winding

37. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
400
A swaging tool
A piston type metering device
True

38. Where is insulation used on copper tubing used for air-conditioning?
100
The suction line or the low-pressure side
Staples and tape
The takeoff fitting

39. Why are some ACR tubing lines insulated?
4
They are physically larger
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Slugging

40. Pressure in ductwork is measured In what?
A bypass duct or a dump zone
40 A
Inches of water column (in. WC)
It will have a decrease in superheat

41. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
No
To lower the amount of pressure drop through the coil
High
Pull a vacuum

42. How do you calculate the area of a circle?
A dirty evaporator
Fiberglass
Pi x radius squared
Inclined manometer

43. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
30-35 degrees above ambient
High
The takeoff fitting

44. 7' round duct has a ballpark cfm of what?
A band 4 inches or more in width
Yes
By increasing the surface of the condenser coil
150

45. What are normal conditions - as defined by the ARI.
40 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Any amount
400

46. The crankcase heater on an air-conditioning compressor is used to what?
No
A dirty evaporator
Boil the liquid refrigerant out ot the oil within the crankcase
4

47. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
Subtract ambient temperature from 100
A diffuser
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

48. What can cause a decrease in suction pressure on an air-conditioning system?
18 gauge
It will be high
A dirty evaporator
Over 800 degrees F

49. What kind of copper tubing is used for refrigeration or air-conditioning applications?
20 degrees above ambient
400
Yes
ACR (air-conditioning refrigeration) tubing

50. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
Common
It will be low
8-12 degrees F

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Residential Air Conditioning

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