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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. How long should you leave a system off once you kill power before restarting it?
2 minutes
Yes
Yes
ACR (air-conditioning refrigeration) tubing

2. How is flexible duct supported?
A band 4 inches or more in width
Potential relay and start capacitor
Blended refrigerants
A diffuser

3. How is flexible duct supported?
The suction line or the low-pressure side
A band 4 inches or more in width
Heat loss
Negative

4. What kind of copper tubing is used for plumbing and heating applications?
L-type
Nominal-sized tubing
With an are rating
18 gauge

5. How will too much refrigerant effect subcooling?
It will be high
Side-by-side and over-and-under
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Rise

6. How many amps can 12 g wire handle?
30 A
20 A
A bypass duct or a dump zone
15 A

7. What tool is used to expand the diameter of soft copper tubing
Pull a vacuum
1/4'
When the system is under pressure
A swaging tool

8. What are normal conditions - as defined by the ARI.
20 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
It will have a decrease in superheat
A piston type metering device

9. What are the two types of package units?
Over 800 degrees F
4
Side-by-side and over-and-under
A diffuser

10. How do you achieve high-efficiency?
Standard
By increasing the surface of the condenser coil
5 degrees
A band 4 inches or more in width

11. How is nominal-sized tubing sized?
Duct - electrical - and mechanical
6
Inside diameter (ID)
Indoor fan motor - outdoor fan motor - and the compressor

12. What are the two types of package units?
105 degrees F
30-35 degrees above ambient
Side-by-side and over-and-under
Pi x radius squared

13. Superheat should never be below how many degrees
5 degrees
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
30-35 degrees above ambient
Staples and tape

14. What percentage silver do you need to use for an are-410 system?
Yes
15% silphos
Suction
12000

15. How do you calculate the area of a circle?
Infiltration and ventilation
With an are rating
Pi x radius squared
A diffuser

16. What can cause a decrease in suction pressure on an air-conditioning system?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
They are larger
A dirty evaporator
Positive

17. What sort of pressure will a pull-through evaporator have?
Fiberglass
Yes
Negative
By increasing the surface of the condenser coil

18. What is the name of the fitting where the branch line leaves the duct?
ACR (air-conditioning refrigeration) tubing
45 degrees F
In parallel
The takeoff fitting

19. What gauge is thermostat wire?
Outside diameter (OD)
Suction
Nominal-sized tubing
18 gauge

20. 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
Nitrogen with a small amount of refrigerant
200
100 psig

21. What are the two basic duct connection configurations for package units supply and return air ducts?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Over/under and side by side
Side-by-side and over-and-under
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

22. What are the three major power-consuming devices on an air-conditioning system?
Any amount
30 degrees F
A band 4 inches or more in width
Indoor fan motor - outdoor fan motor - and the compressor

23. 10' round duct has a ballpark cfm of what?
No
Subtract ambient temperature from 100
Static pressure - velocity pressure - and total pressure
400

24. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
They are larger
A piston type metering device
Below 800 degrees F

25. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
30 degrees F
20 degrees F
Potential relay and start capacitor
It will have a decrease in superheat

26. 9' round duct has a ballpark cfm of what?
To remove humidity and lower dry bulb temperature
300
30-35 degrees above ambient
Inches of water column (in. WC)

27. What is the name of the fitting where the branch line leaves the duct?
Yes
The takeoff fitting
ACR (air-conditioning refrigeration) tubing
Btu/hr (output) / wattage (input)

28. What do you do after you braze a system?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Boil the liquid refrigerant out ot the oil within the crankcase
Pull a vacuum

29. Does a package unit come from the factory pre-charged?
Inside diameter (ID)
6
4
Yes

30. What is the typical pressure differance across a TXV?
L-type
150
100 psig
Side-by-side and over-and-under

31. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Potential relay and start capacitor
With 4' saddles
20 degrees F
2 minutes

32. What are the four materials used to make duct?
False
Static pressure - velocity pressure - and total pressure
Negative
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

33. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
100
Belt drive and direct drive
By increasing the surface of the condenser coil

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

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35. Where do you apply flux when soldering?
2
Over 800 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside of the male fitting

36. A reciprocating compressor has what sort of moving parts?
2 minutes
20 A
400
Pistons

37. What is a package unit?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
They are physically larger
4

38. What percentage silver do you need to use for an are-410 system?
In parallel
It will have a decrease in superheat
15% silphos
No

39. What kind of metering device do high-efficiency units usually use?
TXV
When the system is under pressure
The takeoff fitting
6

40. What is the range for normal superheat and subcooling?
Before the vent
Outside diameter (OD)
8-12 degrees F
105 degrees F

41. What is considered normal operating conditions?
Boil the liquid refrigerant out ot the oil within the crankcase
Any amount
200
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

42. What is used to measure static air pressure in ducts.
20 degrees above ambient
Over 800 degrees F
Outside diameter (OD)
Inclined manometer

43. At what temperature does refrigerant condense in a high-efficiency unit?
Latent and sensible
Pull a vacuum
20 degrees above ambient
Individual return air systems and central return air systems

44. Most duct insulation is made of what?
Fiberglass
It will have a decrease in superheat
40 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

45. How do you calculate LRA?
Inches of water column (in. WC)
RLA/FLA x 5
Pistons
Pull a vacuum

46. If the rpm's are 1750 - how many poles does the motor have?
Heat load
4
8
A dirty evaporator

47. What are normal conditions - as defined by the ARI.
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Outside diameter (OD)
Pull a vacuum
8-12 degrees F

48. How many cfm per ton?
Yes
8
It will be high
400

49. How will too much refrigerant effect superheat?
It will be low
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Latent and sensible
Common

50. Which type of wire can handle a higher ampacity?
Nitrogen with a small amount of refrigerant
SEER includes the energy used in the start-up and shut-down cycles
300
Stranded

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Residential Air Conditioning

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