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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 tool is used to expand the diameter of soft copper tubing
RLA/FLA x 5
A swaging tool
Duct - electrical - and mechanical
105 degrees F

2. How is nominal-sized tubing sized?
2 minutes
100
To remove humidity and lower dry bulb temperature
Inside diameter (ID)

3. What gauge is thermostat wire?
100
18 gauge
S-clips and drives (cleats)
Standard

4. The fan switch closes at what temperature?
140 degrees F
Staples and tape
Negative
20 degrees F

5. How many amps can 14 g wire handle?
Yes
15 A
8
TXV

6. What are the three ways a motor can fail electrically?
With an are rating
Shorted winding - open winding - and grounded winding
1/4'
Heat load

7. What tool is used to expand the diameter of soft copper tubing
Potential relay and start capacitor
Yes
A swaging tool
Individual return air systems and central return air systems

8. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Yes
20 A
20 degrees above ambient

9. The compressor is cooled by liquid refrigerant. (True of False)
False
When it is a pull-through evaporator
30-35 degrees above ambient
No

10. What is the difference between SEER and EER?
Nitrogen with a small amount of refrigerant
SEER includes the energy used in the start-up and shut-down cycles
Negative
Negative

11. Do you need a vent on a push-through evaporator?
8-12 degrees F
When it is a pull-through evaporator
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

12. What is the name of the fitting where the branch line leaves the duct?
Suction
The takeoff fitting
Inches of water column (in. WC)
Nitrogen with a small amount of refrigerant

13. What do you use to connect square and rectangular ductboard together?
Inside diameter (ID)
It will be low
S-clips and drives (cleats)
Outside diameter (OD)

14. How do you calculate cfm?

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15. What are the components of a hard-start kit?
It will be high
ACR (air-conditioning refrigeration) tubing
Potential relay and start capacitor
High

16. Do you need a trap on a pull-through evaporator?
ACR (air-conditioning refrigeration) tubing
Yes
On the common terminal
A swaging tool

17. Can refrigerant line sets be altered in length?
100
It will have a decrease in superheat
Latent and sensible
Yes

18. 9' round duct has a ballpark cfm of what?
Nitrogen with a small amount of refrigerant
Any amount
Inclined manometer
300

19. If the rpm's are 1750 - how many poles does the motor have?
15 A
30-35 degrees above ambient
18 gauge
4

20. If the rpm's are 3450 - how many poles does the motor have?
The suction line or the low-pressure side
2
S-clips and drives (cleats)
When it is above a conditioned space

21. How long should you leave a system off once you kill power before restarting it?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
The takeoff fitting
2 minutes
Below 800 degrees F

22. How are round ducts supported?

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23. What are the three crafts normally associated with an air-conditioned installation?
Latent and sensible
High
Duct - electrical - and mechanical
140 degrees F

24. How many amps can 10 g wire handle?
100
It will have a decrease in superheat
30 A
Outside of the male fitting

25. When must a copper joint never be soldered or brazed?
True
When the system is under pressure
8-12 degrees F
Yes

26. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
Pull a vacuum
Individual return air systems and central return air systems
105 degrees F

27. Do you need a trap on a push-through evaporator?
In parallel
1/4'
5 degrees
No

28. How does ACR copper pipe come?
15% silphos
It also rises
Dehydrated with caps on each end
They are physically larger

29. The A/C size is calculated by what?
In series
RLA/FLA x 5
Over 800 degrees F
Heat load

30. How is ACR tubing sized?
Indoor fan motor - outdoor fan motor - and the compressor
Outside diameter (OD)
30-35 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles

31. What kind of refrigeratnts must be added in liquid form?
Yes
A diffuser
Blended refrigerants
30 degrees F

32. What do you do after you braze a system?
In series
Pull a vacuum
30 degrees F
400

33. What are the three major power-consuming devices on an air-conditioning system?
Vapor
Indoor fan motor - outdoor fan motor - and the compressor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Stranded

34. If the rpm's are 1050 - how many poles does the motor have?
2
15 A
6
When it is a pull-through evaporator

35. Superheat should never be below how many degrees
100
18 gauge
5 degrees
Negative

36. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
200
100
L-type
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

37. What are the two types of return air systems in residential installations?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Fiberglass
Individual return air systems and central return air systems
Staples and tape

38. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Standard

39. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Duct - electrical - and mechanical
Latent and sensible
True
Infiltration and ventilation

40. The load on the evaporater will effect which pressure?
It will be low
Duct - electrical - and mechanical
Rise
Suction

41. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
SEER includes the energy used in the start-up and shut-down cycles
With 4' saddles
No

42. How many cfm per ton?
Stranded
400
Rise
Staples and tape

43. What kind of metering device do high-efficiency units usually use?
Dehydrated with caps on each end
TXV
Shorted winding - open winding - and grounded winding
Yes

44. What component changes refrigerant from a low pressure gas to a high pressure gas?
Btu/hr (output) / wattage (input)
Belt drive and direct drive
SEER includes the energy used in the start-up and shut-down cycles
Compressor

45. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The suction line or the low-pressure side
8

46. How are the condenser coils different on a high-efficiency unit?
They are larger
Yes
200
Yes

47. The load on the evaporater will effect which pressure?
Suction
Negative
40 A
15% silphos

48. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
Fiberglass
8-12 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

49. What are the three ways a motor can fail electrically?
4
Yes
Shorted winding - open winding - and grounded winding
4

50. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
20 degrees F
L-type
To lower the amount of pressure drop through the coil

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Residential Air Conditioning

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