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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. 9' round duct has a ballpark cfm of what?
TXV
300
Indoor fan motor - outdoor fan motor - and the compressor
Inches of water column (in. WC)

2. What are the two functions of the air-conditioning system?
Yes
To remove humidity and lower dry bulb temperature
100 psig
Standard

3. If the rpm's are 1050 - how many poles does the motor have?
Indoor fan motor - outdoor fan motor - and the compressor
6
Yes
30 degrees F

4. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Potential relay and start capacitor
Duct with insulation on the inside
40 degrees F
They are physically larger

5. Do you need a vent on a push-through evaporator?
By increasing the surface of the condenser coil
Yes
300
They are larger

6. What is the design boiling point for most evaporator coils in residential air conditioning?
Heat loss
Static pressure - velocity pressure - and total pressure
Yes
40 degrees F

7. Superheat should never be below how many degrees
45-55%
5 degrees
1/4'
A swaging tool

8. How are round ducts connected to one another?
Yes
No
Btu/hr (output) / wattage (input)
With a minimum of three evenly spaced self-tapping screws

9. What tool is used to expand the diameter of soft copper tubing
5 degrees
A swaging tool
100
Btu/hr (output) / wattage (input)

10. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
With 4' saddles
TXV
RLA/FLA x 5

11. The evaporator is designed to remove what two types of heat?
Latent and sensible
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
12000
Nominal-sized tubing

12. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
With an are rating
150
Suction

13. What percentage silver do you need to use for an are-410 system?
Potential relay and start capacitor
RLA/FLA x 5
15% silphos
Yes

14. What are the two types of blower drives?
40 degrees F
Yes
Belt drive and direct drive
30 degrees F

15. How is insulation around a duct rated?
High
40 A
They are larger
With an are rating

16. What is the name of the fitting where the branch line leaves the duct?
Compressor
Infiltration and ventilation
Stranded
The takeoff fitting

17. How many BTU's per ton?
12000
6
30-35 degrees above ambient
20 degrees above ambient

18. When do you install a trap on a drain line?
When it is a pull-through evaporator
A bypass duct or a dump zone
It rises
Stranded

19. At what temperature will brazing melt?
Yes
Pi x radius squared
Over 800 degrees F
Static pressure - velocity pressure - and total pressure

20. When do you install an auxillary drain pan?
When it is above a conditioned space
Yes
Blended refrigerants
Fiberglass

21. The load on the evaporater will effect which pressure?
Vapor
Infiltration and ventilation
Suction
2 minutes

22. Sections of duct board can be fastened together with what?
SEER includes the energy used in the start-up and shut-down cycles
Staples and tape
A piston type metering device
150

23. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
Subtract ambient temperature from 100
Heat load
Inches of water column (in. WC)

24. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
45 degrees F
A dirty evaporator
8
A bypass duct or a dump zone

25. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
12000
Standard
False

26. When must a copper joint never be soldered or brazed?
Indoor fan motor - outdoor fan motor - and the compressor
When the system is under pressure
Individual return air systems and central return air systems
300

27. If the rpm's are 1050 - how many poles does the motor have?
By increasing the surface of the condenser coil
6
Yes
In series

28. What gauge is thermostat wire?
18 gauge
Over 800 degrees F
Pi x radius squared
With an are rating

29. What is the range for normal superheat and subcooling?
Individual return air systems and central return air systems
8-12 degrees F
It will be low
200

30. Where do you install a trap on a drain line?
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Standard
Before the vent

31. How are the condenser coils different on a high-efficiency unit?
With an are rating
Potential relay and start capacitor
They are larger
Rise

32. At what temperature does refrigerant condense in a high-efficiency unit?
140 degrees F
45 degrees F
20 degrees above ambient
100 psig

33. What are the three pressures created by moving air in ductwork?
Before the vent
When the system is under pressure
Static pressure - velocity pressure - and total pressure
Heat loss

34. How is the high pressure switch wired with the low pressure switch?
Static pressure - velocity pressure - and total pressure
In parallel
Stranded
The takeoff fitting

35. How do you calculate EER?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Btu/hr (output) / wattage (input)
6
Belt drive and direct drive

36. What kind of copper tubing is used for plumbing and heating applications?
25-ft or 50-ft
Nominal-sized tubing
Staples and tape
140 degrees F

37. What are the two types of package units?
Side-by-side and over-and-under
Pistons
Inside diameter (ID)
100 psig

38. How many amps can 8 g wire handle?
15% silphos
Nitrogen with a small amount of refrigerant
40 A
Pull a vacuum

39. How do you achieve high-efficiency?
Pi x radius squared
6
By increasing the surface of the condenser coil
Over/under and side by side

40. How long should you leave a system off once you kill power before restarting it?
Indoor fan motor - outdoor fan motor - and the compressor
300
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
2 minutes

41. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
When it is a pull-through evaporator
In series
Positive

42. Do you need a trap on a push-through evaporator?
No
In series
False
Belt drive and direct drive

43. What component changes refrigerant from a low pressure gas to a high pressure gas?
A band 4 inches or more in width
Compressor
SEER includes the energy used in the start-up and shut-down cycles
Inclined manometer

44. Do you need a vent on a pull-through evaporator?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Yes
A swaging tool
Over/under and side by side

45. 7' round duct has a ballpark cfm of what?
Staples and tape
Outside diameter (OD)
150
Over 800 degrees F

46. Can refrigerant line sets be altered in length?
When it is above a conditioned space
Any amount
Nitrogen with a small amount of refrigerant
Yes

47. What sort of pressure will a pull-through evaporator have?
45 degrees F
No
Negative
4

48. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Compressor
30 degrees F
100
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

49. How many cfm per ton?
Suction
Common
400
Inches of water column (in. WC)

50. What do you use to check for leaks?
When the system is under pressure
Nitrogen with a small amount of refrigerant
With 4' saddles
30 A

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Residential Air Conditioning

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