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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. A reciprocating compressor has what sort of moving parts?
100 psig
Over 800 degrees F
When it is a pull-through evaporator
Pistons

2. Do you need a trap on a pull-through evaporator?
Yes
4
Latent and sensible
Individual return air systems and central return air systems

3. The fan switch opens at what temperature?
Individual return air systems and central return air systems
105 degrees F
A band 4 inches or more in width
5 degrees

4. 6' round duct has a ballpark cfm of what?
100
8
A dirty evaporator
200

5. What is considered normal operating conditions?
It rises
Blended refrigerants
400
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

6. When do you install an auxillary drain pan?
Shorted winding - open winding - and grounded winding
When it is above a conditioned space
Inside diameter (ID)
A band 4 inches or more in width

7. At what temperature does refrigerant condense in a standard-efficiency unit?
20 degrees above ambient
30-35 degrees above ambient
Below 800 degrees F
Yes

8. Where is insulation used on copper tubing used for air-conditioning?
No
Average feet per minute X area in square feet (H' x W'/144)
25-ft or 50-ft
The suction line or the low-pressure side

9. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Inclined manometer
A bypass duct or a dump zone
False
100 psig

10. How many amps can 12 g wire handle?
Shorted winding - open winding - and grounded winding
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
20 A
Pistons

11. Do you need a vent on a push-through evaporator?
Rise
Yes
A diffuser
TXV

12. 10 SEER is classified as what kind of efficiency?
When it is above a conditioned space
20 A
Infiltration and ventilation
Standard

13. How many BTU's per ton?
15% silphos
Indoor fan motor - outdoor fan motor - and the compressor
Suction
12000

14. The evaporator is designed to remove what two types of heat?
Shorted winding - open winding - and grounded winding
1/4'
With an are rating
Latent and sensible

15. At what temperature does refrigerant condense in a standard-efficiency unit?
TXV
Boil the liquid refrigerant out ot the oil within the crankcase
1/4'
30-35 degrees above ambient

16. What are the two types of package units?
Side-by-side and over-and-under
With an are rating
400
When it is above a conditioned space

17. How many amps can 8 g wire handle?
Latent and sensible
Boil the liquid refrigerant out ot the oil within the crankcase
40 A
A band 4 inches or more in width

18. What is lined duct?
Duct with insulation on the inside
Nitrogen with a small amount of refrigerant
They are physically larger
Yes

19. The fan switch closes at what temperature?
Positive
Inches of water column (in. WC)
140 degrees F
Latent and sensible

20. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
Nominal-sized tubing
Negative
Suction

21. What is the difference between SEER and EER?
They are physically larger
SEER includes the energy used in the start-up and shut-down cycles
A bypass duct or a dump zone
Outside of the male fitting

22. How are round ducts supported?

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23. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
Slugging
Suction
It will have a decrease in superheat

24. If the rpm's are 3450 - how many poles does the motor have?
400
Inclined manometer
Rise
2

25. What is the normal evaporator temperature?
200
45 degrees F
Inside diameter (ID)
5 degrees

26. How long should you leave a system off once you kill power before restarting it?
Duct with insulation on the inside
L-type
2 minutes
Potential relay and start capacitor

27. What is the typical pressure differance across a TXV?
Dehydrated with caps on each end
With a minimum of three evenly spaced self-tapping screws
Over/under and side by side
100 psig

28. 13 SEER is classified as what kind of efficiency?
High
100 psig
105 degrees F
400

29. Sections of duct board can be fastened together with what?
False
Negative
15 A
Staples and tape

30. Where do you apply flux when soldering?
To lower the amount of pressure drop through the coil
A diffuser
Duct - electrical - and mechanical
Outside of the male fitting

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

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32. How will too much refrigerant effect superheat?
It will be low
Negative
A dirty evaporator
Potential relay and start capacitor

33. What type of air conditioning system must be charged using the superheat method?
Any amount
Any amount
The takeoff fitting
A piston type metering device

34. In what length rolls is soft copper tubing normally available?
Fiberglass
Average feet per minute X area in square feet (H' x W'/144)
25-ft or 50-ft
Indoor fan motor - outdoor fan motor - and the compressor

35. How is insulation around a duct rated?
With an are rating
12000
100 psig
30 A

36. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Latent and sensible
20 degrees F
They are physically larger
It will be high

37. Do you need a trap on a push-through evaporator?
Below 800 degrees F
Duct with insulation on the inside
Heat loss
No

38. How is nominal-sized tubing sized?
6
5 degrees
Nitrogen with a small amount of refrigerant
Inside diameter (ID)

39. How will too much refrigerant effect subcooling?
Compressor
TXV
A diffuser
It will be high

40. How will too much refrigerant effect subcooling?
It will be high
40 degrees F
SEER includes the energy used in the start-up and shut-down cycles
With a minimum of three evenly spaced self-tapping screws

41. In what length rolls is soft copper tubing normally available?
Pi x radius squared
Infiltration and ventilation
25-ft or 50-ft
When it is above a conditioned space

42. Does a package unit come from the factory pre-charged?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Outside of the male fitting
Yes
Pistons

43. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Pi x radius squared
To lower the amount of pressure drop through the coil
False
15% silphos

44. How long should you leave a system off once you kill power before restarting it?
2 minutes
Yes
Common
The suction line or the low-pressure side

45. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
150
20 degrees F
Duct - electrical - and mechanical
Blended refrigerants

46. If the suction pressure rises - what happens to the head pressure?
105 degrees F
It also rises
They are physically larger
A piston type metering device

47. At what temperature will soft solder melt?
Below 800 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Positive
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

48. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
Staples and tape
In series
Slugging

49. How many cfm per ton?
400
Individual return air systems and central return air systems
It also rises
To remove humidity and lower dry bulb temperature

50. What kind of refrigeratnts must be added in liquid form?
400
Blended refrigerants
20 degrees F
Yes

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Residential Air Conditioning

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