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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. If the suction pressure rises - what happens to the head pressure?
8-12 degrees F
It also rises
When the system is under pressure
20 degrees F

2. What can cause a decrease in suction pressure on an air-conditioning system?
TXV
A dirty evaporator
40 degrees F
15% silphos

3. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
Static pressure - velocity pressure - and total pressure
Over 800 degrees F
30-35 degrees above ambient

4. If the suction pressure rises - what happens to the head pressure?
It also rises
40 degrees F
25-ft or 50-ft
Yes

5. How many amps can 12 g wire handle?
Yes
20 A
Compressor
To lower the amount of pressure drop through the coil

6. What are the three ways a motor can fail electrically?
Subtract ambient temperature from 100
Shorted winding - open winding - and grounded winding
40 degrees F
2 minutes

7. How many amps can 14 g wire handle?
Individual return air systems and central return air systems
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
15 A
100

8. 6' round duct has a ballpark cfm of what?
25-ft or 50-ft
100
Inclined manometer
When the system is under pressure

9. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
To lower the amount of pressure drop through the coil
Nitrogen with a small amount of refrigerant
Compressor

10. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
High
15 A
Yes
It will have a decrease in superheat

11. How many BTU's per ton?
400
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It also rises
12000

12. 6' round duct has a ballpark cfm of what?
18 gauge
A bypass duct or a dump zone
Infiltration and ventilation
100

13. Can refrigerant line sets be altered in length?
Inside diameter (ID)
Yes
100
It will be high

14. Pressure in ductwork is measured In what?
2
RLA/FLA x 5
Inches of water column (in. WC)
30 A

15. What kind of refrigeratnts must be added in liquid form?
Indoor fan motor - outdoor fan motor - and the compressor
Stranded
Blended refrigerants
5 degrees

16. What is the normal evaporator temperature?
Dehydrated with caps on each end
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
By increasing the surface of the condenser coil
45 degrees F

17. Where do you install a trap on a drain line?
With a minimum of three evenly spaced self-tapping screws
Over 800 degrees F
Before the vent
Belt drive and direct drive

18. How many amps can 12 g wire handle?
Duct with insulation on the inside
1/4'
Vapor
20 A

19. When do you install an auxillary drain pan?
45 degrees F
When it is above a conditioned space
Yes
Yes

20. What are the two types of blower drives?
It will have a decrease in superheat
Belt drive and direct drive
When it is a pull-through evaporator
Any amount

21. What kind of metering device do high-efficiency units usually use?
Positive
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
TXV
Outside of the male fitting

22. On what terminal do you check amperage?
Common
To lower the amount of pressure drop through the coil
Compressor
No

23. How do you calculate the area of a circle?
Latent and sensible
Pi x radius squared
40 degrees F
Outside of the male fitting

24. Do you need a trap on a push-through evaporator?
Potential relay and start capacitor
Compressor
No
12000

25. Superheat should never be below how many degrees
150
5 degrees
Yes
By increasing the surface of the condenser coil

26. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Side-by-side and over-and-under
Positive
In series
It also rises

27. What is used to measure static air pressure in ducts.
Inclined manometer
2 minutes
By increasing the surface of the condenser coil
TXV

28. Why are some ACR tubing lines insulated?
Over/under and side by side
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
300

29. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Shorted winding - open winding - and grounded winding
They are physically larger
Duct with insulation on the inside

30. When do you install an auxillary drain pan?
45 degrees F
100
When it is above a conditioned space
Below 800 degrees F

31. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Subtract ambient temperature from 100
Any amount
Heat loss
Pi x radius squared

32. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
The takeoff fitting
Below 800 degrees F
Blended refrigerants

33. What sort of pressure will a pull-through evaporator have?
Negative
On the common terminal
Rise
40 degrees F

34. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
By increasing the surface of the condenser coil
30 degrees F
Yes
TXV

35. At what temperature will brazing melt?
It will be high
8-12 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Over 800 degrees F

36. In what state is the refrigerant in the compressor?
Boil the liquid refrigerant out ot the oil within the crankcase
Outside of the male fitting
Vapor
On the common terminal

37. 9' round duct has a ballpark cfm of what?
A diffuser
Pull a vacuum
300
8-12 degrees F

38. How are the condenser coils different on a high-efficiency unit?
They are larger
False
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Average feet per minute X area in square feet (H' x W'/144)

39. The compressor is cooled by liquid refrigerant. (True of False)
In parallel
False
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
12000

40. How will too much refrigerant effect superheat?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
With 4' saddles
It will be low
TXV

41. What is lined duct?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
They are larger
A swaging tool
Duct with insulation on the inside

42. 10 SEER is classified as what kind of efficiency?
Standard
No
Side-by-side and over-and-under
They are physically larger

43. How is insulation around a duct rated?
They are larger
Inches of water column (in. WC)
200
With an are rating

44. Do you need a vent on a push-through evaporator?
L-type
Fiberglass
8
Yes

45. What is considered normal operating conditions?
Staples and tape
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Outside of the male fitting
They are physically larger

46. The compressor is cooled by liquid refrigerant. (True of False)
When it is above a conditioned space
Compressor
Pistons
False

47. 13 SEER is classified as what kind of efficiency?
40 A
High
400
Average feet per minute X area in square feet (H' x W'/144)

48. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Below 800 degrees F
False
Pistons

49. The load on the evaporater will effect which pressure?
Stranded
By increasing the surface of the condenser coil
No
Suction

50. What are the two basic duct connection configurations for package units supply and return air ducts?
TXV
Over/under and side by side
Inside diameter (ID)
In parallel

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Residential Air Conditioning

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