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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. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
S-clips and drives (cleats)
By increasing the surface of the condenser coil
To lower the amount of pressure drop through the coil
Infiltration and ventilation

2. What are the two types of blower drives?
45 degrees F
8-12 degrees F
Belt drive and direct drive
True

3. Will a dirty condenser cause a rise or fall in pressure?
Rise
105 degrees F
They are larger
With a minimum of three evenly spaced self-tapping screws

4. How is the high pressure switch wired with the low pressure switch?
Pistons
A band 4 inches or more in width
To lower the amount of pressure drop through the coil
In parallel

5. What are the two types of blower drives?
Vapor
5 degrees
Belt drive and direct drive
The takeoff fitting

6. What is the typical pressure differance across a TXV?
High
In series
Duct - electrical - and mechanical
100 psig

7. What are the two ways that fresh air enters a structure?
Slugging
Infiltration and ventilation
Heat loss
15% silphos

8. What are the two types of package units?
Dehydrated with caps on each end
105 degrees F
True
Side-by-side and over-and-under

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

10. Where is insulation used on copper tubing used for air-conditioning?
150
Negative
40 A
The suction line or the low-pressure side

11. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
On the common terminal
150
4

12. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Dehydrated with caps on each end
A bypass duct or a dump zone
It will have a decrease in superheat
In series

13. If the rpm's are 3450 - how many poles does the motor have?
True
2
Latent and sensible
With a minimum of three evenly spaced self-tapping screws

14. How are round ducts supported?

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15. How do you calculate LRA?
Infiltration and ventilation
RLA/FLA x 5
8
Compressor

16. What are the two basic duct connection configurations for package units supply and return air ducts?
With an are rating
400
Over/under and side by side
Outside diameter (OD)

17. The A/C size is calculated by what?
Compressor
Yes
Heat load
Dehydrated with caps on each end

18. Superheat should never be below how many degrees
S-clips and drives (cleats)
Yes
Inside diameter (ID)
5 degrees

19. What is the name of the fitting where the branch line leaves the duct?
A diffuser
Indoor fan motor - outdoor fan motor - and the compressor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
The takeoff fitting

20. What kind of refrigeratnts must be added in liquid form?
A swaging tool
Blended refrigerants
Outside diameter (OD)
8

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

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22. At what temperature does refrigerant condense in a standard-efficiency unit?
300
30-35 degrees above ambient
To lower the amount of pressure drop through the coil
When it is above a conditioned space

23. Can refrigerant line sets be altered in length?
They are physically larger
Yes
Fiberglass
Below 800 degrees F

24. What are the three major power-consuming devices on an air-conditioning system?
Yes
Nitrogen with a small amount of refrigerant
12000
Indoor fan motor - outdoor fan motor - and the compressor

25. 10' round duct has a ballpark cfm of what?
400
With a minimum of three evenly spaced self-tapping screws
Heat load
20 degrees F

26. How is flexible duct supported?
Outside diameter (OD)
40 degrees F
A band 4 inches or more in width
Over/under and side by side

27. What are the two types of return air systems in residential installations?
Belt drive and direct drive
No
It will be low
Individual return air systems and central return air systems

28. What are the three ways a motor can fail electrically?
It rises
ACR (air-conditioning refrigeration) tubing
20 degrees above ambient
Shorted winding - open winding - and grounded winding

29. Sections of duct board can be fastened together with what?
By increasing the surface of the condenser coil
When it is a pull-through evaporator
Suction
Staples and tape

30. What kind of copper tubing is used for plumbing and heating applications?
400
Nominal-sized tubing
Staples and tape
30 degrees F

31. What tool is used to expand the diameter of soft copper tubing
Yes
Compressor
When the system is under pressure
A swaging tool

32. What are the components of a hard-start kit?
Duct with insulation on the inside
Potential relay and start capacitor
Over/under and side by side
A diffuser

33. What sort of pressure will a pull-through evaporator have?
30 degrees F
Negative
The takeoff fitting
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

34. If the suction pressure rises - what happens to the head pressure?
400
Average feet per minute X area in square feet (H' x W'/144)
In parallel
It also rises

35. Do you need a vent on a push-through evaporator?
Staples and tape
Rise
They are physically larger
Yes

36. When must a copper joint never be soldered or brazed?
When the system is under pressure
300
L-type
With 4' saddles

37. What are the two types of return air systems in residential installations?
With 4' saddles
Individual return air systems and central return air systems
15% silphos
140 degrees F

38. 9' round duct has a ballpark cfm of what?
Positive
300
It rises
40 degrees F

39. What are the three crafts normally associated with an air-conditioned installation?
Side-by-side and over-and-under
Duct - electrical - and mechanical
20 degrees above ambient
30 A

40. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
25-ft or 50-ft
It will have a decrease in superheat

41. Which is more efficient - a TXV or a fixed-orifice metering device?
Blended refrigerants
5 degrees
TXV
When the system is under pressure

42. How do you calculate LRA?
RLA/FLA x 5
Blended refrigerants
Common
Subtract ambient temperature from 100

43. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Individual return air systems and central return air systems
300
Subtract ambient temperature from 100

44. What kind of refrigeratnts must be added in liquid form?
Blended refrigerants
18 gauge
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Compressor

45. At what temperature does refrigerant condense in a high-efficiency unit?
Indoor fan motor - outdoor fan motor - and the compressor
20 degrees above ambient
25-ft or 50-ft
TXV

46. How is nominal-sized tubing sized?
Inside diameter (ID)
Inches of water column (in. WC)
100 psig
With an are rating

47. Where do you check the amps on a motor?
Slugging
To lower the amount of pressure drop through the coil
On the common terminal
A swaging tool

48. What are the three crafts normally associated with an air-conditioned installation?
It will have a decrease in superheat
Positive
SEER includes the energy used in the start-up and shut-down cycles
Duct - electrical - and mechanical

49. If pressure rises - what happens to the superheat?
When it is above a conditioned space
Rise
No
It rises

50. How are the condenser coils different on a high-efficiency unit?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
18 gauge
They are larger
Side-by-side and over-and-under

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Residential Air Conditioning

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