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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 are round ducts connected to one another?
Heat loss
In parallel
With a minimum of three evenly spaced self-tapping screws
Standard

2. How many BTU's per ton?
Heat load
Staples and tape
12000
Duct - electrical - and mechanical

3. What is considered normal operating conditions?
Outside diameter (OD)
To lower the amount of pressure drop through the coil
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles

4. What sort of pressure will a pull-through evaporator have?
S-clips and drives (cleats)
Yes
Negative
Nitrogen with a small amount of refrigerant

5. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
By increasing the surface of the condenser coil
A dirty evaporator
Belt drive and direct drive

6. What is used to measure static air pressure in ducts.
2
Compressor
Inclined manometer
A band 4 inches or more in width

7. What are the components of a hard-start kit?
Potential relay and start capacitor
Pistons
False
It will be low

8. 10 SEER is classified as what kind of efficiency?
Belt drive and direct drive
Standard
SEER includes the energy used in the start-up and shut-down cycles
Slugging

9. Do you need a trap on a pull-through evaporator?
When the system is under pressure
40 A
Below 800 degrees F
Yes

10. In what state is the refrigerant in the compressor?
Negative
Dehydrated with caps on each end
400
Vapor

11. How many amps can 8 g wire handle?
With 4' saddles
Indoor fan motor - outdoor fan motor - and the compressor
Heat load
40 A

12. What are the two types of blower drives?
Yes
Heat loss
Belt drive and direct drive
Btu/hr (output) / wattage (input)

13. What kind of refrigeratnts must be added in liquid form?
Yes
It will be high
Blended refrigerants
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

14. How many amps can 12 g wire handle?
20 A
With an are rating
To remove humidity and lower dry bulb temperature
100 psig

15. At what temperature does refrigerant condense in a standard-efficiency unit?
When it is a pull-through evaporator
30-35 degrees above ambient
Staples and tape
Inside diameter (ID)

16. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
It also rises
A bypass duct or a dump zone
40 degrees F
When the system is under pressure

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

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18. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
A bypass duct or a dump zone
With a minimum of three evenly spaced self-tapping screws
L-type
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

19. In what length rolls is soft copper tubing normally available?
SEER includes the energy used in the start-up and shut-down cycles
Latent and sensible
Pull a vacuum
25-ft or 50-ft

20. If the rpm's are 1050 - how many poles does the motor have?
6
Nitrogen with a small amount of refrigerant
When the system is under pressure
Duct with insulation on the inside

21. What type of air conditioning system must be charged using the superheat method?
Yes
A piston type metering device
150
Belt drive and direct drive

22. What are the two types of return air systems in residential installations?
Heat load
Individual return air systems and central return air systems
12000
Pistons

23. How long should you leave a system off once you kill power before restarting it?
It will have a decrease in superheat
It will be high
2 minutes
Pistons

24. At what temperature will soft solder melt?
A piston type metering device
Below 800 degrees F
The suction line or the low-pressure side
Btu/hr (output) / wattage (input)

25. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Outside diameter (OD)
Any amount
Yes

26. How is flexible duct supported?
Btu/hr (output) / wattage (input)
Nitrogen with a small amount of refrigerant
A band 4 inches or more in width
Indoor fan motor - outdoor fan motor - and the compressor

27. Which type of wire can handle a higher ampacity?
400
RLA/FLA x 5
Stranded
Subtract ambient temperature from 100

28. 13 SEER is classified as what kind of efficiency?
Inclined manometer
RLA/FLA x 5
High
5 degrees

29. What gauge is thermostat wire?
8
It rises
18 gauge
4

30. How are round ducts supported?

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31. Pressure in ductwork is measured In what?
8-12 degrees F
With an are rating
SEER includes the energy used in the start-up and shut-down cycles
Inches of water column (in. WC)

32. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
On the common terminal
45 degrees F
140 degrees F

33. 7' round duct has a ballpark cfm of what?
150
Rise
12000
18 gauge

34. If the rpm's are 1050 - how many poles does the motor have?
Yes
Belt drive and direct drive
On the common terminal
6

35. Which is more efficient - a TXV or a fixed-orifice metering device?
Nitrogen with a small amount of refrigerant
TXV
15 A
Inclined manometer

36. In what state is the refrigerant in the compressor?
Vapor
A band 4 inches or more in width
100 psig
On the common terminal

37. What are the two types of package units?
Side-by-side and over-and-under
When the system is under pressure
A diffuser
Btu/hr (output) / wattage (input)

38. The A/C size is calculated by what?
Heat load
30 degrees F
Inside diameter (ID)
The takeoff fitting

39. How are the condenser coils different on a high-efficiency unit?
They are larger
A piston type metering device
When the system is under pressure
2

40. What kind of refrigeratnts must be added in liquid form?
Compressor
6
Blended refrigerants
Static pressure - velocity pressure - and total pressure

41. The crankcase heater on an air-conditioning compressor is used to what?
Static pressure - velocity pressure - and total pressure
Pi x radius squared
Over/under and side by side
Boil the liquid refrigerant out ot the oil within the crankcase

42. What is the design boiling point for most evaporator coils in residential air conditioning?
12000
40 degrees F
Positive
Rise

43. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Nitrogen with a small amount of refrigerant
In series
Average feet per minute X area in square feet (H' x W'/144)
Heat loss

44. What are the two types of blower drives?
4
Staples and tape
Belt drive and direct drive
Below 800 degrees F

45. What tool is used to expand the diameter of soft copper tubing
A band 4 inches or more in width
Heat load
A swaging tool
In series

46. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
No
Dehydrated with caps on each end
45-55%
The suction line or the low-pressure side

47. The fan switch opens at what temperature?
2
Inclined manometer
No
105 degrees F

48. How many amps can 12 g wire handle?
It will have a decrease in superheat
20 A
RLA/FLA x 5
It rises

49. What are the two functions of the air-conditioning system?
Inclined manometer
By increasing the surface of the condenser coil
To remove humidity and lower dry bulb temperature
A swaging tool

50. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
It also rises
Inches of water column (in. WC)
SEER includes the energy used in the start-up and shut-down cycles

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Residential Air Conditioning

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