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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 percentage silver do you need to use for an are-410 system?
Inside diameter (ID)
40 degrees F
Yes
15% silphos

2. How many cfm per ton?
On the common terminal
With a minimum of three evenly spaced self-tapping screws
A diffuser
400

3. At what temperature does refrigerant condense in a standard-efficiency unit?
18 gauge
30-35 degrees above ambient
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A swaging tool

4. What are the two types of package units?
2 minutes
Individual return air systems and central return air systems
Side-by-side and over-and-under
18 gauge

5. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
30 degrees F
4
45-55%

6. What sort of pressure will a push-through evaporator have?
It will be low
Positive
Nominal-sized tubing
Pistons

7. What sort of pressure will a pull-through evaporator have?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Negative
140 degrees F

8. If the rpm's are 1050 - how many poles does the motor have?
They are larger
6
Pull a vacuum
Belt drive and direct drive

9. When do you install an auxillary drain pan?
When it is above a conditioned space
100
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Inclined manometer

10. How do you achieve high-efficiency?
L-type
By increasing the surface of the condenser coil
Yes
15 A

11. What are the two types of blower drives?
Any amount
Common
Slugging
Belt drive and direct drive

12. 13 SEER is classified as what kind of efficiency?
Nominal-sized tubing
High
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
They are physically larger

13. Where do you install a trap on a drain line?
Before the vent
4
S-clips and drives (cleats)
Outside of the male fitting

14. How is insulation around a duct rated?
With an are rating
Boil the liquid refrigerant out ot the oil within the crankcase
20 A
6

15. Do you need a vent on a push-through evaporator?
Yes
They are physically larger
200
45-55%

16. How do you calculate the area of a circle?
Pi x radius squared
Over/under and side by side
Inside diameter (ID)
False

17. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
It will be high
40 degrees F
Any amount
Yes

18. If the rpm's are 1050 - how many poles does the motor have?
30 degrees F
6
High
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

19. The A/C size is calculated by what?
They are physically larger
Heat load
Heat loss
Pi x radius squared

20. How is ACR tubing sized?
Outside diameter (OD)
Duct with insulation on the inside
They are larger
Pistons

21. What kind of refrigeratnts must be added in liquid form?
Inches of water column (in. WC)
Nitrogen with a small amount of refrigerant
Blended refrigerants
Pistons

22. How many amps can 14 g wire handle?
15 A
Potential relay and start capacitor
Rise
Before the vent

23. How do you calculate cfm?

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24. What is used to measure static air pressure in ducts.
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Average feet per minute X area in square feet (H' x W'/144)
20 degrees F
Inclined manometer

25. What is considered normal operating conditions?
High
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Duct with insulation on the inside

26. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
6
With 4' saddles
Pull a vacuum

27. What component changes refrigerant from a low pressure gas to a high pressure gas?
105 degrees F
Btu/hr (output) / wattage (input)
A swaging tool
Compressor

28. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
8-12 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A piston type metering device

29. On what terminal do you check amperage?
400
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Pistons
Common

30. When must a copper joint never be soldered or brazed?
When the system is under pressure
It also rises
15% silphos
To lower the amount of pressure drop through the coil

31. Do you need a trap on a pull-through evaporator?
Slugging
Yes
200
High

32. Do you need a vent on a pull-through evaporator?
Blended refrigerants
Individual return air systems and central return air systems
Yes
Any amount

33. What is the design boiling point for most evaporator coils in residential air conditioning?
20 degrees above ambient
Static pressure - velocity pressure - and total pressure
Negative
40 degrees F

34. If the rpm's are 1750 - how many poles does the motor have?
4
100 psig
It also rises
Btu/hr (output) / wattage (input)

35. The fan switch closes at what temperature?
Inside diameter (ID)
400
140 degrees F
25-ft or 50-ft

36. The crankcase heater on an air-conditioning compressor is used to what?
Negative
Boil the liquid refrigerant out ot the oil within the crankcase
They are physically larger
High

37. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
400
Static pressure - velocity pressure - and total pressure
RLA/FLA x 5
To lower the amount of pressure drop through the coil

38. Will a dirty condenser cause a rise or fall in pressure?
105 degrees F
Rise
They are physically larger
Indoor fan motor - outdoor fan motor - and the compressor

39. Do you need a trap on a pull-through evaporator?
In series
Yes
400
Latent and sensible

40. Does a package unit come from the factory pre-charged?
Yes
A bypass duct or a dump zone
Inside diameter (ID)
In parallel

41. If pressure rises - what happens to the superheat?
100
4
It rises
Pistons

42. What is the normal evaporator temperature?
When the system is under pressure
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A diffuser
45 degrees F

43. What do you do after you braze a system?
Pull a vacuum
ACR (air-conditioning refrigeration) tubing
It also rises
With an are rating

44. 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
140 degrees F
Nominal-sized tubing
5 degrees

45. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
To lower the amount of pressure drop through the coil
When it is a pull-through evaporator

46. How are the condenser coils different on a high-efficiency unit?
They are larger
Pistons
Heat load
Nitrogen with a small amount of refrigerant

47. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
RLA/FLA x 5
Staples and tape
True
Yes

48. What sort of pressure will a push-through evaporator have?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Compressor
Outside diameter (OD)
Positive

49. What are the three pressures created by moving air in ductwork?
In series
Static pressure - velocity pressure - and total pressure
A swaging tool
Suction

50. Sections of duct board can be fastened together with what?
300
To remove humidity and lower dry bulb temperature
Inches of water column (in. WC)
Staples and tape

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Residential Air Conditioning

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