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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 is the design boiling point for most evaporator coils in residential air conditioning?
TXV
Subtract ambient temperature from 100
40 degrees F
When it is above a conditioned space

2. What distributes supply air to a room in a structure?
8-12 degrees F
25-ft or 50-ft
Compressor
A diffuser

3. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Inclined manometer
Standard
100 psig
40 degrees F

4. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
It also rises
To lower the amount of pressure drop through the coil
A dirty evaporator
SEER includes the energy used in the start-up and shut-down cycles

5. Does a package unit come from the factory pre-charged?
105 degrees F
45 degrees F
Yes
Heat load

6. What do you use to connect square and rectangular ductboard together?
To remove humidity and lower dry bulb temperature
8-12 degrees F
S-clips and drives (cleats)
Average feet per minute X area in square feet (H' x W'/144)

7. How will too much refrigerant effect superheat?
False
Belt drive and direct drive
It will be low
Yes

8. At what temperature does refrigerant condense in a high-efficiency unit?
20 A
20 degrees above ambient
15 A
30 degrees F

9. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
40 A
True
They are physically larger

10. A reciprocating compressor has what sort of moving parts?
RLA/FLA x 5
Nominal-sized tubing
Pistons
When it is above a conditioned space

11. What are the three ways a motor can fail electrically?
15% silphos
It also rises
False
Shorted winding - open winding - and grounded winding

12. At what temperature will soft solder melt?
Nominal-sized tubing
RLA/FLA x 5
Indoor fan motor - outdoor fan motor - and the compressor
Below 800 degrees F

13. How is flexible duct supported?
A band 4 inches or more in width
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The takeoff fitting
Dehydrated with caps on each end

14. How many BTU's per ton?
12000
Nitrogen with a small amount of refrigerant
It also rises
TXV

15. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
L-type
With an are rating
A bypass duct or a dump zone
6

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

17. What are the three major power-consuming devices on an air-conditioning system?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
20 degrees above ambient
Nitrogen with a small amount of refrigerant
Indoor fan motor - outdoor fan motor - and the compressor

18. What are the three crafts normally associated with an air-conditioned installation?
Subtract ambient temperature from 100
Duct - electrical - and mechanical
Inches of water column (in. WC)
Duct with insulation on the inside

19. Does a package unit come from the factory pre-charged?
The takeoff fitting
Indoor fan motor - outdoor fan motor - and the compressor
Yes
By increasing the surface of the condenser coil

20. Do you need a trap on a pull-through evaporator?
140 degrees F
18 gauge
High
Yes

21. What is the typical pressure differance across a TXV?
100 psig
45 degrees F
Heat loss
Vapor

22. What are normal conditions - as defined by the ARI.
With 4' saddles
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Heat loss
Over 800 degrees F

23. At what temperature does refrigerant condense in a standard-efficiency unit?
Yes
30-35 degrees above ambient
Negative
ACR (air-conditioning refrigeration) tubing

24. How is nominal-sized tubing sized?
Inside diameter (ID)
A dirty evaporator
2 minutes
4

25. What distributes supply air to a room in a structure?
Nitrogen with a small amount of refrigerant
A diffuser
A swaging tool
40 A

26. If pressure rises - what happens to the superheat?
A swaging tool
It rises
20 degrees F
The suction line or the low-pressure side

27. Superheat should never be below how many degrees
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
18 gauge
5 degrees
Duct - electrical - and mechanical

28. How will too much refrigerant effect superheat?
Btu/hr (output) / wattage (input)
Stranded
30 degrees F
It will be low

29. At what temperature does refrigerant condense in a standard-efficiency unit?
4
30-35 degrees above ambient
True
Individual return air systems and central return air systems

30. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Latent and sensible
It will have a decrease in superheat
It rises
TXV

31. What kind of copper tubing is used for plumbing and heating applications?
Inclined manometer
Nominal-sized tubing
Potential relay and start capacitor
400

32. What gauge is thermostat wire?
It rises
Outside diameter (OD)
Nominal-sized tubing
18 gauge

33. Do you need a vent on a pull-through evaporator?
In parallel
Btu/hr (output) / wattage (input)
Yes
When it is a pull-through evaporator

34. What are the two types of package units?
Pull a vacuum
30 A
In parallel
Side-by-side and over-and-under

35. What are the two types of package units?
ACR (air-conditioning refrigeration) tubing
Side-by-side and over-and-under
Common
Shorted winding - open winding - and grounded winding

36. The fan switch opens at what temperature?
105 degrees F
Pi x radius squared
25-ft or 50-ft
2 minutes

37. Can refrigerant line sets be altered in length?
8-12 degrees F
Potential relay and start capacitor
Yes
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

38. The furnace size is calculated by what?
Heat loss
It rises
40 A
Outside diameter (OD)

39. At what temperature will brazing melt?
5 degrees
Over 800 degrees F
Belt drive and direct drive
Staples and tape

40. How do you calculate the area of a circle?
RLA/FLA x 5
A bypass duct or a dump zone
ACR (air-conditioning refrigeration) tubing
Pi x radius squared

41. What can cause a decrease in suction pressure on an air-conditioning system?
A piston type metering device
A dirty evaporator
Static pressure - velocity pressure - and total pressure
Before the vent

42. When do you install a trap on a drain line?
Duct with insulation on the inside
Standard
ACR (air-conditioning refrigeration) tubing
When it is a pull-through evaporator

43. What is considered normal operating conditions?
In parallel
Belt drive and direct drive
Pull a vacuum
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

44. When must a copper joint never be soldered or brazed?
True
When the system is under pressure
Below 800 degrees F
In series

45. The compressor is cooled by liquid refrigerant. (True of False)
Indoor fan motor - outdoor fan motor - and the compressor
False
100 psig
25-ft or 50-ft

46. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
Side-by-side and over-and-under
False
Any amount
4

47. How are the condenser coils different on a high-efficiency unit?
They are larger
Nominal-sized tubing
Below 800 degrees F
A diffuser

48. How do you calculate EER?
They are physically larger
Negative
Btu/hr (output) / wattage (input)
150

49. How many amps can 10 g wire handle?
With 4' saddles
SEER includes the energy used in the start-up and shut-down cycles
High
30 A

50. 13 SEER is classified as what kind of efficiency?
High
300
4
L-type

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Residential Air Conditioning

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