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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. 7' round duct has a ballpark cfm of what?
Shorted winding - open winding - and grounded winding
150
105 degrees F
18 gauge

2. The fan switch closes at what temperature?
8
Common
The takeoff fitting
140 degrees F

3. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Any amount
40 A
15% silphos

4. How is flexible duct supported?
Rise
Nominal-sized tubing
A band 4 inches or more in width
A swaging tool

5. Do you need a trap on a push-through evaporator?
Vapor
No
Common
400

6. On what terminal do you check amperage?
On the common terminal
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
100 psig
Common

7. How long should you leave a system off once you kill power before restarting it?
100
Pistons
2 minutes
30-35 degrees above ambient

8. How many cfm per ton?
Positive
400
Static pressure - velocity pressure - and total pressure
20 degrees above ambient

9. The furnace size is calculated by what?
Yes
150
Heat loss
Static pressure - velocity pressure - and total pressure

10. How are round ducts connected to one another?
SEER includes the energy used in the start-up and shut-down cycles
With a minimum of three evenly spaced self-tapping screws
A bypass duct or a dump zone
2

11. 8' round duct has a ballpark cfm of what?
200
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
When it is above a conditioned space
Over/under and side by side

12. The fan switch opens at what temperature?
30 degrees F
Pistons
In series
105 degrees F

13. At what temperature does refrigerant condense in a high-efficiency unit?
Infiltration and ventilation
Duct with insulation on the inside
High
20 degrees above ambient

14. Where do you apply flux when soldering?
Outside of the male fitting
Average feet per minute X area in square feet (H' x W'/144)
2 minutes
Yes

15. When must a copper joint never be soldered or brazed?
Outside diameter (OD)
5 degrees
When the system is under pressure
With a minimum of three evenly spaced self-tapping screws

16. How many amps can 10 g wire handle?
Duct - electrical - and mechanical
1/4'
30 A
Fiberglass

17. What are the two types of return air systems in residential installations?
15% silphos
When it is a pull-through evaporator
Negative
Individual return air systems and central return air systems

18. At what temperature does refrigerant condense in a standard-efficiency unit?
45 degrees F
105 degrees F
Positive
30-35 degrees above ambient

19. 7' round duct has a ballpark cfm of what?
40 degrees F
150
Boil the liquid refrigerant out ot the oil within the crankcase
S-clips and drives (cleats)

20. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
They are larger
When it is above a conditioned space
When it is a pull-through evaporator

21. How is ACR tubing sized?
Btu/hr (output) / wattage (input)
400
S-clips and drives (cleats)
Outside diameter (OD)

22. If the suction pressure rises - what happens to the head pressure?
False
It also rises
15% silphos
Dehydrated with caps on each end

23. What is used to measure static air pressure in ducts.
No
Positive
Inclined manometer
ACR (air-conditioning refrigeration) tubing

24. What is a package unit?
Slugging
Inside diameter (ID)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
A bypass duct or a dump zone

25. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
8
Common
Blended refrigerants

26. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Below 800 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Static pressure - velocity pressure - and total pressure
30 degrees F

27. Do you need a trap on a pull-through evaporator?
L-type
Yes
8
Outside diameter (OD)

28. How are the condenser coils different on a high-efficiency unit?
400
They are larger
ACR (air-conditioning refrigeration) tubing
L-type

29. At what temperature will soft solder melt?
Below 800 degrees F
S-clips and drives (cleats)
Common
40 A

30. What is the name of the fitting where the branch line leaves the duct?
12000
Yes
The takeoff fitting
RLA/FLA x 5

31. At what temperature will brazing melt?
Over 800 degrees F
Dehydrated with caps on each end
12000
8

32. The load on the evaporater will effect which pressure?
A swaging tool
Vapor
Suction
L-type

33. How do you calculate the area of a circle?
40 A
Standard
Pi x radius squared
Nominal-sized tubing

34. If the rpm's are 1050 - how many poles does the motor have?
6
Below 800 degrees F
Any amount
Any amount

35. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Pull a vacuum
L-type
By increasing the surface of the condenser coil
Pull a vacuum

36. 9' round duct has a ballpark cfm of what?
TXV
Indoor fan motor - outdoor fan motor - and the compressor
Yes
300

37. The evaporator is designed to remove what two types of heat?
Inclined manometer
Latent and sensible
In parallel
Belt drive and direct drive

38. Does a package unit come from the factory pre-charged?
Yes
20 A
Pi x radius squared
30-35 degrees above ambient

39. What tool is used to expand the diameter of soft copper tubing
A swaging tool
In series
400
Latent and sensible

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

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41. What is the difference between SEER and EER?
25-ft or 50-ft
SEER includes the energy used in the start-up and shut-down cycles
18 gauge
Positive

42. How are the condenser coils different on a high-efficiency unit?
Over/under and side by side
15 A
In series
They are larger

43. What do you use to check for leaks?
Infiltration and ventilation
Nitrogen with a small amount of refrigerant
Yes
Shorted winding - open winding - and grounded winding

44. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
25-ft or 50-ft
Blended refrigerants
2 minutes

45. In what state is the refrigerant in the compressor?
Heat loss
15% silphos
Vapor
6

46. Will a dirty condenser cause a rise or fall in pressure?
Rise
To lower the amount of pressure drop through the coil
4
Boil the liquid refrigerant out ot the oil within the crankcase

47. Where is insulation used on copper tubing used for air-conditioning?
Belt drive and direct drive
The suction line or the low-pressure side
Over 800 degrees F
Inches of water column (in. WC)

48. A reciprocating compressor has what sort of moving parts?
It will be low
Common
Fiberglass
Pistons

49. What type of air conditioning system must be charged using the superheat method?
Heat load
6
A piston type metering device
Subtract ambient temperature from 100

50. The compressor is cooled by liquid refrigerant. (True of False)
100 psig
Before the vent
Latent and sensible
False

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Residential Air Conditioning

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