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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. On what terminal do you check amperage?
25-ft or 50-ft
Common
18 gauge
It rises

2. 8' round duct has a ballpark cfm of what?
200
40 degrees F
25-ft or 50-ft
To remove humidity and lower dry bulb temperature

3. Where do you apply flux when soldering?
5 degrees
Outside of the male fitting
Standard
Slugging

4. What are the four materials used to make duct?
40 degrees F
Static pressure - velocity pressure - and total pressure
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Standard

5. What can cause a decrease in suction pressure on an air-conditioning system?
A piston type metering device
It also rises
A dirty evaporator
A band 4 inches or more in width

6. What are the components of a hard-start kit?
Potential relay and start capacitor
Shorted winding - open winding - and grounded winding
Inside diameter (ID)
150

7. If the suction pressure rises - what happens to the head pressure?
20 A
Shorted winding - open winding - and grounded winding
In series
It also rises

8. Where is insulation used on copper tubing used for air-conditioning?
Yes
The suction line or the low-pressure side
To lower the amount of pressure drop through the coil
Duct with insulation on the inside

9. 10' round duct has a ballpark cfm of what?
400
S-clips and drives (cleats)
15% silphos
Yes

10. The load on the evaporater will effect which pressure?
40 A
Blended refrigerants
Suction
25-ft or 50-ft

11. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
ACR (air-conditioning refrigeration) tubing
To lower the amount of pressure drop through the coil
Compressor
In parallel

12. How do you calculate EER?
Individual return air systems and central return air systems
By increasing the surface of the condenser coil
Btu/hr (output) / wattage (input)
Below 800 degrees F

13. How are the condenser coils different on a high-efficiency unit?
Inside diameter (ID)
They are larger
Blended refrigerants
Yes

14. What percentage silver do you need to use for an are-410 system?
A bypass duct or a dump zone
140 degrees F
15% silphos
8

15. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
When it is a pull-through evaporator
Nitrogen with a small amount of refrigerant
When the system is under pressure

16. How long should you leave a system off once you kill power before restarting it?
They are physically larger
2 minutes
Over/under and side by side
400

17. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
2 minutes
Potential relay and start capacitor
SEER includes the energy used in the start-up and shut-down cycles

18. What are the three crafts normally associated with an air-conditioned installation?
Any amount
Inches of water column (in. WC)
Individual return air systems and central return air systems
Duct - electrical - and mechanical

19. What are the two functions of the air-conditioning system?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
S-clips and drives (cleats)
High
To remove humidity and lower dry bulb temperature

20. What gauge is thermostat wire?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Blended refrigerants
18 gauge
Inside diameter (ID)

21. 6' round duct has a ballpark cfm of what?
20 degrees F
100
30 A
400

22. What sort of pressure will a push-through evaporator have?
Positive
Inside diameter (ID)
Boil the liquid refrigerant out ot the oil within the crankcase
Inclined manometer

23. Does a package unit come from the factory pre-charged?
6
The takeoff fitting
Subtract ambient temperature from 100
Yes

24. What are the three ways a motor can fail electrically?
In series
18 gauge
Shorted winding - open winding - and grounded winding
40 degrees F

25. What kind of metering device do high-efficiency units usually use?
With an are rating
20 A
Before the vent
TXV

26. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Fiberglass
Btu/hr (output) / wattage (input)
20 degrees F
Average feet per minute X area in square feet (H' x W'/144)

27. What tool is used to expand the diameter of soft copper tubing
It also rises
Boil the liquid refrigerant out ot the oil within the crankcase
20 A
A swaging tool

28. The fan switch closes at what temperature?
S-clips and drives (cleats)
Yes
True
140 degrees F

29. What kind of copper tubing is used for plumbing and heating applications?
Yes
With 4' saddles
Nominal-sized tubing
Over/under and side by side

30. What are the two types of package units?
Average feet per minute X area in square feet (H' x W'/144)
Rise
5 degrees
Side-by-side and over-and-under

31. What is the range for normal superheat and subcooling?
Btu/hr (output) / wattage (input)
1/4'
15 A
8-12 degrees F

32. How many amps can 12 g wire handle?
20 A
When the system is under pressure
Below 800 degrees F
It will be high

33. How many cfm per ton?
When the system is under pressure
20 degrees above ambient
400
300

34. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
6
Vapor
Subtract ambient temperature from 100
45-55%

35. How many amps can 14 g wire handle?
15 A
Suction
45 degrees F
Individual return air systems and central return air systems

36. What is the difference between SEER and EER?
To remove humidity and lower dry bulb temperature
Inside diameter (ID)
SEER includes the energy used in the start-up and shut-down cycles
300

37. What are the two ways that fresh air enters a structure?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Infiltration and ventilation
Yes
100

38. How is flexible duct supported?
No
A band 4 inches or more in width
Over 800 degrees F
In series

39. What are normal conditions - as defined by the ARI.
With 4' saddles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
A swaging tool
Compressor

40. What component changes refrigerant from a low pressure gas to a high pressure gas?
Infiltration and ventilation
Staples and tape
Compressor
It rises

41. How are round ducts supported?

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42. How does ACR copper pipe come?
Slugging
Dehydrated with caps on each end
Nitrogen with a small amount of refrigerant
Pull a vacuum

43. How do you calculate ballpark superheat?
TXV
Subtract ambient temperature from 100
Any amount
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

44. The A/C size is calculated by what?
Boil the liquid refrigerant out ot the oil within the crankcase
A swaging tool
Subtract ambient temperature from 100
Heat load

45. Sections of duct board can be fastened together with what?
Shorted winding - open winding - and grounded winding
Staples and tape
Nominal-sized tubing
30 degrees F

46. Where do you install a trap on a drain line?
Individual return air systems and central return air systems
5 degrees
True
Before the vent

47. What is it called when liquid refrigerant gets into the compressor?
Shorted winding - open winding - and grounded winding
Slugging
Duct - electrical - and mechanical
S-clips and drives (cleats)

48. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Subtract ambient temperature from 100
30-35 degrees above ambient
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Any amount

49. Why are some ACR tubing lines insulated?
True
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Yes

50. Does a package unit come from the factory pre-charged?
Individual return air systems and central return air systems
18 gauge
Yes
150

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Residential Air Conditioning

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