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Residential Air Conditioning

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Answer 50 questions in 15 minutes.
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1. What is it called when liquid refrigerant gets into the compressor?
They are physically larger
The suction line or the low-pressure side
Slugging
Pull a vacuum

2. What do you use to check for leaks?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Nitrogen with a small amount of refrigerant
L-type
Outside of the male fitting

3. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
SEER includes the energy used in the start-up and shut-down cycles
A bypass duct or a dump zone
Positive
A band 4 inches or more in width

4. 6' round duct has a ballpark cfm of what?
Yes
Average feet per minute X area in square feet (H' x W'/144)
100
High

5. Do you need a vent on a push-through evaporator?
Any amount
Yes
With 4' saddles
With a minimum of three evenly spaced self-tapping screws

6. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
6
Outside of the male fitting
Blended refrigerants
45-55%

7. What tool is used to expand the diameter of soft copper tubing
The suction line or the low-pressure side
A swaging tool
Rise
Belt drive and direct drive

8. When do you install an auxillary drain pan?
300
Nominal-sized tubing
When it is above a conditioned space
Blended refrigerants

9. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
To lower the amount of pressure drop through the coil
By increasing the surface of the condenser coil
Yes
In series

10. What sort of pressure will a pull-through evaporator have?
30 A
40 degrees F
Negative
12000

11. What is lined duct?
Duct with insulation on the inside
A piston type metering device
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Compressor

12. What kind of refrigeratnts must be added in liquid form?
12000
Blended refrigerants
Static pressure - velocity pressure - and total pressure
Rise

13. Where do you check the amps on a motor?
No
Inches of water column (in. WC)
Yes
On the common terminal

14. What are the components of a hard-start kit?
Potential relay and start capacitor
By increasing the surface of the condenser coil
Nitrogen with a small amount of refrigerant
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

15. Can refrigerant line sets be altered in length?
To lower the amount of pressure drop through the coil
Yes
45-55%
Fiberglass

16. What sort of pressure will a pull-through evaporator have?
Positive
105 degrees F
Negative
Potential relay and start capacitor

17. Pressure in ductwork is measured In what?
It will be high
Latent and sensible
Inches of water column (in. WC)
Yes

18. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Over 800 degrees F
RLA/FLA x 5
Pi x radius squared

19. What is the typical pressure differance across a TXV?
Outside of the male fitting
They are physically larger
100 psig
Below 800 degrees F

20. What are the three major power-consuming devices on an air-conditioning system?
Inches of water column (in. WC)
Indoor fan motor - outdoor fan motor - and the compressor
Pull a vacuum
Inclined manometer

21. How will too much refrigerant effect subcooling?
Boil the liquid refrigerant out ot the oil within the crankcase
When it is a pull-through evaporator
2 minutes
It will be high

22. What sort of pressure will a push-through evaporator have?
Positive
Heat loss
Dehydrated with caps on each end
30 degrees F

23. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
S-clips and drives (cleats)
45-55%
With 4' saddles

24. How are round ducts supported?

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25. Which type of wire can handle a higher ampacity?
Negative
Stranded
40 A
1/4'

26. 9' round duct has a ballpark cfm of what?
Average feet per minute X area in square feet (H' x W'/144)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pi x radius squared
300

27. What do you do after you braze a system?
Pull a vacuum
It will be low
SEER includes the energy used in the start-up and shut-down cycles
200

28. Why are some ACR tubing lines insulated?
With a minimum of three evenly spaced self-tapping screws
They are larger
When the system is under pressure
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

29. Where do you apply flux when soldering?
Infiltration and ventilation
Outside of the male fitting
Individual return air systems and central return air systems
Over/under and side by side

30. Most duct insulation is made of what?
Nominal-sized tubing
Fiberglass
45 degrees F
Nominal-sized tubing

31. Which type of wire can handle a higher ampacity?
When it is a pull-through evaporator
40 degrees F
Stranded
8-12 degrees F

32. If the rpm's are 3450 - how many poles does the motor have?
2
No
150
A dirty evaporator

33. What kind of refrigeratnts must be added in liquid form?
Pi x radius squared
A band 4 inches or more in width
TXV
Blended refrigerants

34. What is the range for normal superheat and subcooling?
A swaging tool
With 4' saddles
Nominal-sized tubing
8-12 degrees F

35. What are the two types of blower drives?
Belt drive and direct drive
Common
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Over 800 degrees F

36. The crankcase heater on an air-conditioning compressor is used to what?
They are physically larger
Pi x radius squared
Boil the liquid refrigerant out ot the oil within the crankcase
Dehydrated with caps on each end

37. If pressure rises - what happens to the superheat?
They are larger
When it is a pull-through evaporator
It rises
Side-by-side and over-and-under

38. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
Inches of water column (in. WC)
L-type
Outside diameter (OD)
4

39. When must a copper joint never be soldered or brazed?
When the system is under pressure
Yes
20 degrees F
A piston type metering device

40. What are the three ways a motor can fail electrically?
25-ft or 50-ft
A piston type metering device
Shorted winding - open winding - and grounded winding
Pistons

41. In what length rolls is soft copper tubing normally available?
25-ft or 50-ft
A swaging tool
Belt drive and direct drive
To remove humidity and lower dry bulb temperature

42. At what temperature does refrigerant condense in a high-efficiency unit?
No
20 degrees above ambient
1/4'
In series

43. The furnace size is calculated by what?
Vapor
A bypass duct or a dump zone
30 degrees F
Heat loss

44. What kind of metering device do high-efficiency units usually use?
TXV
Slugging
Pi x radius squared
Negative

45. If the suction pressure rises - what happens to the head pressure?
It also rises
20 A
20 degrees F
Individual return air systems and central return air systems

46. What is the name of the fitting where the branch line leaves the duct?
Outside of the male fitting
Btu/hr (output) / wattage (input)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
The takeoff fitting

47. How many amps can 10 g wire handle?
Blended refrigerants
With a minimum of three evenly spaced self-tapping screws
30 A
The suction line or the low-pressure side

48. Which is more efficient - a TXV or a fixed-orifice metering device?
Inclined manometer
105 degrees F
Slugging
TXV

49. What is a package unit?
400
Slugging
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
4

50. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
2
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
4
Any amount

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Residential Air Conditioning

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