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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. How does ACR copper pipe come?
Dehydrated with caps on each end
140 degrees F
Heat loss
100

2. The fan switch opens at what temperature?
True
105 degrees F
Standard
Positive

3. How is ACR tubing sized?
With a minimum of three evenly spaced self-tapping screws
Outside diameter (OD)
Negative
A swaging tool

4. What can cause a decrease in suction pressure on an air-conditioning system?
With an are rating
100
A dirty evaporator
Latent and sensible

5. 7' round duct has a ballpark cfm of what?
150
Standard
TXV
Slugging

6. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Yes
High
Any amount
Outside diameter (OD)

7. What gauge is thermostat wire?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
It will have a decrease in superheat
Individual return air systems and central return air systems
18 gauge

8. Can refrigerant line sets be altered in length?
20 degrees above ambient
Yes
It will be low
40 degrees F

9. If the rpm's are 3450 - how many poles does the motor have?
In parallel
S-clips and drives (cleats)
2
Suction

10. How is flexible duct supported?
Blended refrigerants
They are physically larger
4
A band 4 inches or more in width

11. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Rise
Inside diameter (ID)
25-ft or 50-ft

12. What kind of metering device do high-efficiency units usually use?
TXV
2
30 A
To lower the amount of pressure drop through the coil

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

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14. How long should you leave a system off once you kill power before restarting it?
Before the vent
2 minutes
Pistons
Nominal-sized tubing

15. How do you calculate LRA?
30 degrees F
Duct with insulation on the inside
RLA/FLA x 5
Yes

16. Does a package unit come from the factory pre-charged?
S-clips and drives (cleats)
High
High
Yes

17. 9' round duct has a ballpark cfm of what?
300
105 degrees F
Latent and sensible
When it is a pull-through evaporator

18. 10' round duct has a ballpark cfm of what?
2 minutes
Pull a vacuum
400
8

19. When do you install an auxillary drain pan?
S-clips and drives (cleats)
With 4' saddles
When it is above a conditioned space
Positive

20. How is ACR tubing sized?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Outside diameter (OD)
Over 800 degrees F
Rise

21. How many amps can 8 g wire handle?
40 A
Vapor
Fiberglass
Standard

22. What are the three pressures created by moving air in ductwork?
Over/under and side by side
Static pressure - velocity pressure - and total pressure
Blended refrigerants
Outside of the male fitting

23. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Negative
L-type
20 A
Compressor

24. How many amps can 14 g wire handle?
15 A
With 4' saddles
Vapor
Stranded

25. What distributes supply air to a room in a structure?
Pull a vacuum
Inches of water column (in. WC)
105 degrees F
A diffuser

26. Do you need a trap on a push-through evaporator?
It will have a decrease in superheat
30 degrees F
When it is a pull-through evaporator
No

27. What is the range for normal superheat and subcooling?
True
To lower the amount of pressure drop through the coil
It also rises
8-12 degrees F

28. What is it called when liquid refrigerant gets into the compressor?
300
30 A
Slugging
It will have a decrease in superheat

29. Where do you check the amps on a motor?
On the common terminal
Pull a vacuum
Indoor fan motor - outdoor fan motor - and the compressor
SEER includes the energy used in the start-up and shut-down cycles

30. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
TXV
S-clips and drives (cleats)
Rise

31. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
45-55%
A band 4 inches or more in width
It will have a decrease in superheat
Pistons

32. How many amps can 12 g wire handle?
When the system is under pressure
Static pressure - velocity pressure - and total pressure
20 A
40 A

33. What are the two types of blower drives?
Belt drive and direct drive
When the system is under pressure
100 psig
Before the vent

34. 13 SEER is classified as what kind of efficiency?
High
1/4'
2 minutes
Potential relay and start capacitor

35. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Common
45 degrees F
200

36. Which type of wire can handle a higher ampacity?
105 degrees F
A band 4 inches or more in width
Stranded
Standard

37. At what temperature will brazing melt?
Over 800 degrees F
Average feet per minute X area in square feet (H' x W'/144)
TXV
With a minimum of three evenly spaced self-tapping screws

38. What are normal conditions - as defined by the ARI.
On the common terminal
In parallel
A swaging tool
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

39. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Infiltration and ventilation
4
Positive

40. In what state is the refrigerant in the compressor?
Vapor
8-12 degrees F
TXV
Stranded

41. How do you calculate the area of a circle?
Pi x radius squared
Below 800 degrees F
SEER includes the energy used in the start-up and shut-down cycles
Common

42. What is the design boiling point for most evaporator coils in residential air conditioning?
When it is above a conditioned space
5 degrees
40 degrees F
Below 800 degrees F

43. Superheat should never be below how many degrees
Yes
Btu/hr (output) / wattage (input)
5 degrees
Yes

44. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
Latent and sensible
100 psig
When it is a pull-through evaporator

45. How do you calculate LRA?
RLA/FLA x 5
Yes
Duct - electrical - and mechanical
15 A

46. What kind of metering device do high-efficiency units usually use?
Staples and tape
Inclined manometer
TXV
To lower the amount of pressure drop through the coil

47. Can refrigerant line sets be altered in length?
Inches of water column (in. WC)
8
Yes
5 degrees

48. A reciprocating compressor has what sort of moving parts?
Pistons
20 A
By increasing the surface of the condenser coil
When it is a pull-through evaporator

49. How is nominal-sized tubing sized?
It will be high
Compressor
Over 800 degrees F
Inside diameter (ID)

50. Where is insulation used on copper tubing used for air-conditioning?
105 degrees F
When the system is under pressure
2 minutes
The suction line or the low-pressure side

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Residential Air Conditioning

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