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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 are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
200
Pistons
1/4'

2. What are the two types of return air systems in residential installations?
Static pressure - velocity pressure - and total pressure
Latent and sensible
Individual return air systems and central return air systems
8-12 degrees F

3. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Yes
False
20 degrees F
25-ft or 50-ft

4. What is the range for normal superheat and subcooling?
Dehydrated with caps on each end
15% silphos
8-12 degrees F
Average feet per minute X area in square feet (H' x W'/144)

5. What is the name of the fitting where the branch line leaves the duct?
Yes
The takeoff fitting
In series
30-35 degrees above ambient

6. What kind of copper tubing is used for refrigeration or air-conditioning applications?
25-ft or 50-ft
ACR (air-conditioning refrigeration) tubing
Static pressure - velocity pressure - and total pressure
2 minutes

7. Will a dirty condenser cause a rise or fall in pressure?
Rise
Negative
15% silphos
Standard

8. How are round ducts connected to one another?
With a minimum of three evenly spaced self-tapping screws
Heat loss
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With an are rating

9. If pressure rises - what happens to the superheat?
By increasing the surface of the condenser coil
200
45-55%
It rises

10. How do you calculate the area of a circle?
400
Pi x radius squared
Dehydrated with caps on each end
It rises

11. What is a package unit?
Infiltration and ventilation
S-clips and drives (cleats)
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
On the common terminal

12. 10' round duct has a ballpark cfm of what?
40 A
L-type
400
150

13. What is used to measure static air pressure in ducts.
Yes
Inclined manometer
Inside diameter (ID)
Shorted winding - open winding - and grounded winding

14. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
400
In parallel
Potential relay and start capacitor

15. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Inches of water column (in. WC)
25-ft or 50-ft
No
30 degrees F

16. The evaporator is designed to remove what two types of heat?
Latent and sensible
Suction
When it is above a conditioned space
Fiberglass

17. What are the three pressures created by moving air in ductwork?
When it is above a conditioned space
20 A
40 A
Static pressure - velocity pressure - and total pressure

18. What are the components of a hard-start kit?
20 degrees F
Potential relay and start capacitor
Infiltration and ventilation
Side-by-side and over-and-under

19. At what temperature will brazing melt?
Heat load
Over 800 degrees F
SEER includes the energy used in the start-up and shut-down cycles
Rise

20. On what terminal do you check amperage?
Blended refrigerants
Side-by-side and over-and-under
Common
Dehydrated with caps on each end

21. 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
Nominal-sized tubing
With a minimum of three evenly spaced self-tapping screws

22. At what temperature will soft solder melt?
Negative
On the common terminal
400
Below 800 degrees F

23. If the rpm's are 1750 - how many poles does the motor have?
4
False
Latent and sensible
A band 4 inches or more in width

24. What is lined duct?
200
With 4' saddles
Pistons
Duct with insulation on the inside

25. How many amps can 12 g wire handle?
20 degrees above ambient
20 A
12000
Blended refrigerants

26. A reciprocating compressor has what sort of moving parts?
Belt drive and direct drive
Heat loss
4
Pistons

27. The load on the evaporater will effect which pressure?
Infiltration and ventilation
SEER includes the energy used in the start-up and shut-down cycles
Suction
20 degrees F

28. When must a copper joint never be soldered or brazed?
By increasing the surface of the condenser coil
When the system is under pressure
Slugging
Pi x radius squared

29. How is ACR tubing sized?
Side-by-side and over-and-under
Outside diameter (OD)
Slugging
Belt drive and direct drive

30. What do you use to connect square and rectangular ductboard together?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
12000
S-clips and drives (cleats)
40 degrees F

31. What are the three major power-consuming devices on an air-conditioning system?
Yes
Btu/hr (output) / wattage (input)
Indoor fan motor - outdoor fan motor - and the compressor
Inside diameter (ID)

32. Superheat should never be below how many degrees
Common
To lower the amount of pressure drop through the coil
5 degrees
To lower the amount of pressure drop through the coil

33. How do you calculate LRA?
RLA/FLA x 5
Pistons
Individual return air systems and central return air systems
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

34. When do you install an auxillary drain pan?
When it is above a conditioned space
6
Pull a vacuum
Shorted winding - open winding - and grounded winding

35. Do you need a trap on a push-through evaporator?
18 gauge
No
It will have a decrease in superheat
With a minimum of three evenly spaced self-tapping screws

36. What is the range for normal superheat and subcooling?
Belt drive and direct drive
8-12 degrees F
It will be low
A swaging tool

37. The fan switch closes at what temperature?
400
Over/under and side by side
140 degrees F
Negative

38. 8' round duct has a ballpark cfm of what?
When it is above a conditioned space
200
20 degrees above ambient
False

39. How is the high pressure switch wired with the low pressure switch?
Dehydrated with caps on each end
When it is above a conditioned space
In parallel
Yes

40. What is the normal evaporator temperature?
Stranded
They are physically larger
45 degrees F
It will be low

41. What is the typical pressure differance across a TXV?
100 psig
Duct with insulation on the inside
18 gauge
Staples and tape

42. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Standard
It rises
Standard

43. If the rpm's are 1050 - how many poles does the motor have?
Suction
6
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
To lower the amount of pressure drop through the coil

44. How do you calculate EER?
25-ft or 50-ft
45-55%
Btu/hr (output) / wattage (input)
It will be high

45. What sort of pressure will a pull-through evaporator have?
Heat loss
Negative
It rises
Staples and tape

46. What are the three major power-consuming devices on an air-conditioning system?
Duct - electrical - and mechanical
Indoor fan motor - outdoor fan motor - and the compressor
150
To remove humidity and lower dry bulb temperature

47. How many amps can 14 g wire handle?
Any amount
15 A
TXV
Static pressure - velocity pressure - and total pressure

48. At what temperature does refrigerant condense in a standard-efficiency unit?
Inside diameter (ID)
30-35 degrees above ambient
Infiltration and ventilation
Yes

49. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
1/4'
L-type
The suction line or the low-pressure side
Nominal-sized tubing

50. Where is insulation used on copper tubing used for air-conditioning?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
The suction line or the low-pressure side
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Common

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Residential Air Conditioning

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