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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. What can cause a decrease in suction pressure on an air-conditioning system?
100
A dirty evaporator
S-clips and drives (cleats)
Slugging

2. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It also rises
TXV

3. If the suction pressure rises - what happens to the head pressure?
Suction
With an are rating
200
It also rises

4. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
100 psig
30 degrees F
Yes
Individual return air systems and central return air systems

5. What do you use to check for leaks?
It also rises
A swaging tool
ACR (air-conditioning refrigeration) tubing
Nitrogen with a small amount of refrigerant

6. If the rpm's are 1050 - how many poles does the motor have?
6
Any amount
Blended refrigerants
With a minimum of three evenly spaced self-tapping screws

7. How do you achieve high-efficiency?
TXV
By increasing the surface of the condenser coil
45-55%
Any amount

8. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
20 A
5 degrees
8-12 degrees F

9. How do you calculate EER?
12000
Btu/hr (output) / wattage (input)
Side-by-side and over-and-under
With 4' saddles

10. How is the high pressure switch wired with the low pressure switch?
300
15 A
In parallel
1/4'

11. 10 SEER is classified as what kind of efficiency?
Heat loss
Standard
20 A
L-type

12. What are the three major power-consuming devices on an air-conditioning system?
With 4' saddles
8
Inclined manometer
Indoor fan motor - outdoor fan motor - and the compressor

13. 10' round duct has a ballpark cfm of what?
TXV
A swaging tool
400
Standard

14. How is the high pressure switch wired with the low pressure switch?
In series
True
A band 4 inches or more in width
In parallel

15. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
400
Boil the liquid refrigerant out ot the oil within the crankcase
20 A

16. The fan switch closes at what temperature?
Yes
140 degrees F
30 degrees F
Individual return air systems and central return air systems

17. 8' round duct has a ballpark cfm of what?
Static pressure - velocity pressure - and total pressure
200
30 A
When it is above a conditioned space

18. If the rpm's are 3450 - how many poles does the motor have?
Compressor
Vapor
Rise
2

19. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
Heat load
18 gauge
Negative

20. What gauge is thermostat wire?
18 gauge
RLA/FLA x 5
Stranded
Yes

21. What are the two types of package units?
By increasing the surface of the condenser coil
Side-by-side and over-and-under
Belt drive and direct drive
Common

22. How are round ducts connected to one another?
Yes
With a minimum of three evenly spaced self-tapping screws
Common
By increasing the surface of the condenser coil

23. What are normal conditions - as defined by the ARI.
It will be high
105 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
They are larger

24. What are the two types of package units?
A bypass duct or a dump zone
200
Side-by-side and over-and-under
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

25. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
TXV
Common
A dirty evaporator

26. How do you calculate EER?
Btu/hr (output) / wattage (input)
A piston type metering device
True
By increasing the surface of the condenser coil

27. How many amps can 10 g wire handle?
30 A
20 degrees F
40 A
400

28. What is it called when liquid refrigerant gets into the compressor?
Slugging
Indoor fan motor - outdoor fan motor - and the compressor
Infiltration and ventilation
40 degrees F

29. What are the three crafts normally associated with an air-conditioned installation?
300
Duct - electrical - and mechanical
Duct with insulation on the inside
Btu/hr (output) / wattage (input)

30. How do you calculate cfm?

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31. 9' round duct has a ballpark cfm of what?
SEER includes the energy used in the start-up and shut-down cycles
300
The takeoff fitting
Static pressure - velocity pressure - and total pressure

32. On what terminal do you check amperage?
Any amount
A swaging tool
Common
They are larger

33. Do you need a trap on a push-through evaporator?
Yes
20 degrees above ambient
Static pressure - velocity pressure - and total pressure
No

34. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
15 A
It will have a decrease in superheat
A diffuser
Subtract ambient temperature from 100

35. 10 SEER is classified as what kind of efficiency?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Standard
Negative
100 psig

36. How do you calculate the area of a circle?
L-type
400
Pi x radius squared
25-ft or 50-ft

37. What kind of copper tubing is used for plumbing and heating applications?
In series
Nominal-sized tubing
20 degrees F
Indoor fan motor - outdoor fan motor - and the compressor

38. How will too much refrigerant effect superheat?
It will be low
Inches of water column (in. WC)
4
Side-by-side and over-and-under

39. The evaporator is designed to remove what two types of heat?
Latent and sensible
Staples and tape
105 degrees F
A dirty evaporator

40. At what temperature will brazing melt?
The takeoff fitting
8-12 degrees F
Over 800 degrees F
Any amount

41. Why are some ACR tubing lines insulated?
45-55%
Outside diameter (OD)
Inside diameter (ID)
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

42. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
5 degrees
Yes
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

43. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
25-ft or 50-ft
Any amount
Infiltration and ventilation

44. What do you do after you braze a system?
Nitrogen with a small amount of refrigerant
Pull a vacuum
140 degrees F
40 degrees F

45. The fan switch opens at what temperature?
105 degrees F
Nitrogen with a small amount of refrigerant
Yes
With 4' saddles

46. 13 SEER is classified as what kind of efficiency?
High
40 A
Staples and tape
15% silphos

47. Most duct insulation is made of what?
RLA/FLA x 5
20 degrees above ambient
30 A
Fiberglass

48. When must a copper joint never be soldered or brazed?
8
Latent and sensible
When the system is under pressure
Pistons

49. What are the two types of blower drives?
Belt drive and direct drive
It rises
Inside diameter (ID)
SEER includes the energy used in the start-up and shut-down cycles

50. Do you need a vent on a pull-through evaporator?
Yes
200
20 degrees above ambient
Pi x radius squared

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Residential Air Conditioning

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