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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. When do you install an auxillary drain pan?
6
When it is above a conditioned space
Yes
A piston type metering device

2. Superheat should never be below how many degrees
With 4' saddles
5 degrees
They are physically larger
Positive

3. Why are some ACR tubing lines insulated?
Outside diameter (OD)
Positive
Pistons
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

4. What is the design boiling point for most evaporator coils in residential air conditioning?
400
It also rises
40 degrees F
Dehydrated with caps on each end

5. What gauge is thermostat wire?
Below 800 degrees F
Infiltration and ventilation
18 gauge
L-type

6. At what temperature does refrigerant condense in a high-efficiency unit?
A diffuser
S-clips and drives (cleats)
20 degrees above ambient
Below 800 degrees F

7. The fan switch closes at what temperature?
Nominal-sized tubing
Common
By increasing the surface of the condenser coil
140 degrees F

8. Which type of wire can handle a higher ampacity?
Over/under and side by side
Stranded
A diffuser
Before the vent

9. How many amps can 12 g wire handle?
Latent and sensible
20 A
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

10. Which type of wire can handle a higher ampacity?
Inches of water column (in. WC)
8
Stranded
45 degrees F

11. How many amps can 12 g wire handle?
Indoor fan motor - outdoor fan motor - and the compressor
200
A bypass duct or a dump zone
20 A

12. Superheat should never be below how many degrees
S-clips and drives (cleats)
2 minutes
Suction
5 degrees

13. What do you use to connect square and rectangular ductboard together?
The suction line or the low-pressure side
S-clips and drives (cleats)
Infiltration and ventilation
Pi x radius squared

14. What are the components of a hard-start kit?
Potential relay and start capacitor
Vapor
Average feet per minute X area in square feet (H' x W'/144)
They are larger

15. What sort of pressure will a pull-through evaporator have?
Potential relay and start capacitor
Over 800 degrees F
When it is above a conditioned space
Negative

16. What is the difference between SEER and EER?
It will be high
40 degrees F
The suction line or the low-pressure side
SEER includes the energy used in the start-up and shut-down cycles

17. What distributes supply air to a room in a structure?
To lower the amount of pressure drop through the coil
40 degrees F
A diffuser
20 degrees F

18. 9' round duct has a ballpark cfm of what?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
False
300
20 A

19. How is nominal-sized tubing sized?
20 degrees above ambient
Inside diameter (ID)
400
Latent and sensible

20. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Compressor
45-55%
30 degrees F
20 degrees F

21. In what state is the refrigerant in the compressor?
Fiberglass
Vapor
5 degrees
20 A

22. Why are some ACR tubing lines insulated?
Infiltration and ventilation
On the common terminal
Subtract ambient temperature from 100
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

23. What tool is used to expand the diameter of soft copper tubing
It will be low
A swaging tool
30 A
300

24. If the suction pressure rises - what happens to the head pressure?
Compressor
It also rises
20 degrees above ambient
SEER includes the energy used in the start-up and shut-down cycles

25. What do you use to check for leaks?
Vapor
Negative
Nitrogen with a small amount of refrigerant
Yes

26. How many amps can 8 g wire handle?
Heat loss
Yes
15 A
40 A

27. What kind of copper tubing is used for plumbing and heating applications?
TXV
Nominal-sized tubing
The takeoff fitting
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

28. Sections of duct board can be fastened together with what?
A bypass duct or a dump zone
Slugging
Staples and tape
The suction line or the low-pressure side

29. When must a copper joint never be soldered or brazed?
18 gauge
Suction
When the system is under pressure
1/4'

30. What is the normal evaporator temperature?
Side-by-side and over-and-under
A dirty evaporator
30 A
45 degrees F

31. If the rpm's are 750 - how many poles does the motor have?
8
False
45 degrees F
45-55%

32. What are the four materials used to make duct?
Average feet per minute X area in square feet (H' x W'/144)
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes
40 A

33. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
In series
It will have a decrease in superheat
8
In parallel

34. If pressure rises - what happens to the superheat?
By increasing the surface of the condenser coil
It rises
4
The takeoff fitting

35. What can cause a decrease in suction pressure on an air-conditioning system?
6
A dirty evaporator
In series
105 degrees F

36. What are the three crafts normally associated with an air-conditioned installation?
Compressor
Yes
Duct - electrical - and mechanical
30 degrees F

37. How are round ducts supported?

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38. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
Negative
15 A
Latent and sensible

39. How does ACR copper pipe come?
Vapor
Belt drive and direct drive
Dehydrated with caps on each end
40 degrees F

40. Do you need a vent on a pull-through evaporator?
Individual return air systems and central return air systems
200
105 degrees F
Yes

41. 10' round duct has a ballpark cfm of what?
400
When the system is under pressure
5 degrees
4

42. The fan switch opens at what temperature?
Pull a vacuum
1/4'
105 degrees F
To lower the amount of pressure drop through the coil

43. How do you calculate EER?
Yes
True
Btu/hr (output) / wattage (input)
Subtract ambient temperature from 100

44. On what terminal do you check amperage?
Yes
A dirty evaporator
140 degrees F
Common

45. What is the normal evaporator temperature?
45 degrees F
RLA/FLA x 5
Heat loss
Stranded

46. The load on the evaporater will effect which pressure?
Suction
Average feet per minute X area in square feet (H' x W'/144)
30 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

47. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
12000
140 degrees F
Subtract ambient temperature from 100

48. What do you do after you braze a system?
Pull a vacuum
18 gauge
It also rises
45 degrees F

49. What do you use to check for leaks?
Staples and tape
S-clips and drives (cleats)
Nitrogen with a small amount of refrigerant
Inclined manometer

50. How many amps can 14 g wire handle?
RLA/FLA x 5
To lower the amount of pressure drop through the coil
15 A
Any amount

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Residential Air Conditioning

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