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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. 10' round duct has a ballpark cfm of what?
Rise
It also rises
Before the vent
400

2. A reciprocating compressor has what sort of moving parts?
Pistons
Inside diameter (ID)
30 A
45 degrees F

3. Do you need a vent on a pull-through evaporator?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
40 degrees F
Yes

4. Do you need a trap on a push-through evaporator?
No
2 minutes
30 A
They are larger

5. Why are some ACR tubing lines insulated?
When the system is under pressure
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Infiltration and ventilation
200

6. What is used to measure static air pressure in ducts.
45-55%
Inclined manometer
With an are rating
Pistons

7. If the suction pressure rises - what happens to the head pressure?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Inches of water column (in. WC)
It also rises
Shorted winding - open winding - and grounded winding

8. How do you calculate LRA?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Below 800 degrees F
RLA/FLA x 5
It will have a decrease in superheat

9. What is lined duct?
Duct with insulation on the inside
Belt drive and direct drive
It will have a decrease in superheat
4

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

11. What kind of copper tubing is used for refrigeration or air-conditioning applications?
150
20 degrees above ambient
ACR (air-conditioning refrigeration) tubing
Blended refrigerants

12. How are the condenser coils different on a high-efficiency unit?
Common
Infiltration and ventilation
They are larger
Below 800 degrees F

13. How do you calculate LRA?
RLA/FLA x 5
150
30 degrees F
105 degrees F

14. How many cfm per ton?
Positive
It will be low
400
40 degrees F

15. Why are some ACR tubing lines insulated?
Inclined manometer
With an are rating
When it is above a conditioned space
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

16. What is the name of the fitting where the branch line leaves the duct?
Duct - electrical - and mechanical
Blended refrigerants
The takeoff fitting
Outside diameter (OD)

17. What are the two types of blower drives?
Belt drive and direct drive
Vapor
No
25-ft or 50-ft

18. The A/C size is calculated by what?
Heat load
Pistons
Vapor
No

19. Which type of wire can handle a higher ampacity?
It rises
12000
Stranded
2 minutes

20. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
TXV
Any amount
Dehydrated with caps on each end
Heat loss

21. If the rpm's are 750 - how many poles does the motor have?
Over 800 degrees F
Standard
8
When it is above a conditioned space

22. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
Compressor
45-55%
Staples and tape
5 degrees

23. The evaporator is designed to remove what two types of heat?
Latent and sensible
Compressor
Staples and tape
TXV

24. How do you calculate ballpark superheat?
Staples and tape
Yes
45 degrees F
Subtract ambient temperature from 100

25. What can cause a decrease in suction pressure on an air-conditioning system?
Yes
A dirty evaporator
No
Btu/hr (output) / wattage (input)

26. At what temperature will soft solder melt?
Individual return air systems and central return air systems
In parallel
15% silphos
Below 800 degrees F

27. 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
8-12 degrees F
5 degrees
Over 800 degrees F

28. If the rpm's are 1050 - how many poles does the motor have?
By increasing the surface of the condenser coil
6
Yes
2 minutes

29. What is the range for normal superheat and subcooling?
8-12 degrees F
Staples and tape
40 degrees F
6

30. Pressure in ductwork is measured In what?
When it is a pull-through evaporator
Infiltration and ventilation
Inches of water column (in. WC)
RLA/FLA x 5

31. Can refrigerant line sets be altered in length?
Yes
6
Inclined manometer
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

32. How do you achieve high-efficiency?
Subtract ambient temperature from 100
Rise
140 degrees F
By increasing the surface of the condenser coil

33. In what state is the refrigerant in the compressor?
Negative
By increasing the surface of the condenser coil
It also rises
Vapor

34. At what temperature does refrigerant condense in a high-efficiency unit?
2
Standard
105 degrees F
20 degrees above ambient

35. When do you install an auxillary drain pan?
12000
Shorted winding - open winding - and grounded winding
When it is above a conditioned space
Negative

36. When must a copper joint never be soldered or brazed?
Static pressure - velocity pressure - and total pressure
Stranded
It also rises
When the system is under pressure

37. If the rpm's are 1750 - how many poles does the motor have?
TXV
15 A
4
When it is a pull-through evaporator

38. What are the two ways that fresh air enters a structure?
Vapor
To remove humidity and lower dry bulb temperature
Blended refrigerants
Infiltration and ventilation

39. What are the three major power-consuming devices on an air-conditioning system?
140 degrees F
300
Indoor fan motor - outdoor fan motor - and the compressor
Duct - electrical - and mechanical

40. When do you install a trap on a drain line?
400
When it is a pull-through evaporator
With a minimum of three evenly spaced self-tapping screws
TXV

41. At what temperature does refrigerant condense in a standard-efficiency unit?
40 degrees F
105 degrees F
No
30-35 degrees above ambient

42. How is nominal-sized tubing sized?
Inside diameter (ID)
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
8

43. The furnace size is calculated by what?
SEER includes the energy used in the start-up and shut-down cycles
Negative
A bypass duct or a dump zone
Heat loss

44. What are the two functions of the air-conditioning system?
100
Dehydrated with caps on each end
To remove humidity and lower dry bulb temperature
Yes

45. What are the components of a hard-start kit?
Potential relay and start capacitor
200
150
Pull a vacuum

46. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
400
True
40 degrees F
With a minimum of three evenly spaced self-tapping screws

47. Superheat should never be below how many degrees
5 degrees
Btu/hr (output) / wattage (input)
It will be high
4

48. What is the design boiling point for most evaporator coils in residential air conditioning?
Nominal-sized tubing
Stranded
Before the vent
40 degrees F

49. What sort of pressure will a push-through evaporator have?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Positive
RLA/FLA x 5

50. How many BTU's per ton?
12000
To remove humidity and lower dry bulb temperature
Yes
Belt drive and direct drive

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Residential Air Conditioning

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