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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. Which type of wire can handle a higher ampacity?
RLA/FLA x 5
2
Stranded
Yes

2. What kind of refrigeratnts must be added in liquid form?
25-ft or 50-ft
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Blended refrigerants
With 4' saddles

3. At what temperature does refrigerant condense in a standard-efficiency unit?
Below 800 degrees F
15 A
30-35 degrees above ambient
Duct with insulation on the inside

4. What are the two types of return air systems in residential installations?
30 degrees F
105 degrees F
Individual return air systems and central return air systems
Over/under and side by side

5. If the suction pressure rises - what happens to the head pressure?
Duct with insulation on the inside
It also rises
It rises
Pull a vacuum

6. At what temperature will soft solder melt?
Duct with insulation on the inside
Yes
Yes
Below 800 degrees F

7. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
When it is a pull-through evaporator
105 degrees F
Outside diameter (OD)

8. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
140 degrees F
30 degrees F
It rises
Inside diameter (ID)

9. The crankcase heater on an air-conditioning compressor is used to what?
8
Boil the liquid refrigerant out ot the oil within the crankcase
20 A
In parallel

10. How do you calculate cfm?

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11. What percentage silver do you need to use for an are-410 system?
30-35 degrees above ambient
45 degrees F
It rises
15% silphos

12. How do you calculate LRA?
It will be low
It also rises
RLA/FLA x 5
15 A

13. Sections of duct board can be fastened together with what?
Staples and tape
Suction
Standard
With 4' saddles

14. What is the range for normal superheat and subcooling?
8-12 degrees F
300
It will have a decrease in superheat
Belt drive and direct drive

15. What is it called when liquid refrigerant gets into the compressor?
30-35 degrees above ambient
Positive
Slugging
In series

16. How does ACR copper pipe come?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Dehydrated with caps on each end
Duct with insulation on the inside
Common

17. How are round ducts connected to one another?
Outside diameter (OD)
30 degrees F
A diffuser
With a minimum of three evenly spaced self-tapping screws

18. How will too much refrigerant effect subcooling?
20 degrees F
Btu/hr (output) / wattage (input)
It will be high
Indoor fan motor - outdoor fan motor - and the compressor

19. How is the high pressure switch wired with the low pressure switch?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
In parallel
When it is a pull-through evaporator
15% silphos

20. How many cfm per ton?
400
Yes
Indoor fan motor - outdoor fan motor - and the compressor
To remove humidity and lower dry bulb temperature

21. If the rpm's are 3450 - how many poles does the motor have?
Slugging
Heat load
2
Nitrogen with a small amount of refrigerant

22. What can cause a decrease in suction pressure on an air-conditioning system?
400
A dirty evaporator
A piston type metering device
A band 4 inches or more in width

23. How is insulation around a duct rated?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
4
Rise
With an are rating

24. Where do you install a trap on a drain line?
Before the vent
A diffuser
Pull a vacuum
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

25. What kind of copper tubing is used for plumbing and heating applications?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Before the vent
Dehydrated with caps on each end
Nominal-sized tubing

26. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
4
Individual return air systems and central return air systems
Indoor fan motor - outdoor fan motor - and the compressor

27. How do you calculate the area of a circle?
140 degrees F
15% silphos
Below 800 degrees F
Pi x radius squared

28. When must a copper joint never be soldered or brazed?
It will be low
20 degrees F
The suction line or the low-pressure side
When the system is under pressure

29. How are round ducts supported?

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30. What gauge is thermostat wire?
Over 800 degrees F
A band 4 inches or more in width
18 gauge
Infiltration and ventilation

31. How will too much refrigerant effect superheat?
It will be low
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
25-ft or 50-ft
A swaging tool

32. 8' round duct has a ballpark cfm of what?
200
S-clips and drives (cleats)
Potential relay and start capacitor
They are physically larger

33. At what temperature will brazing melt?
12000
Dehydrated with caps on each end
Rise
Over 800 degrees F

34. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Rise
18 gauge
2
It will have a decrease in superheat

35. How many amps can 12 g wire handle?
20 A
It will be low
With 4' saddles
30-35 degrees above ambient

36. 10' round duct has a ballpark cfm of what?
Over/under and side by side
400
No
ACR (air-conditioning refrigeration) tubing

37. In what length rolls is soft copper tubing normally available?
15% silphos
Blended refrigerants
25-ft or 50-ft
12000

38. What do you use to check for leaks?
Nitrogen with a small amount of refrigerant
A dirty evaporator
18 gauge
45 degrees F

39. The furnace size is calculated by what?
Heat loss
When the system is under pressure
Yes
It rises

40. What percentage silver do you need to use for an are-410 system?
Yes
15% silphos
With an are rating
A bypass duct or a dump zone

41. How many amps can 10 g wire handle?
Outside diameter (OD)
30 A
Compressor
4

42. How are the condenser coils different on a high-efficiency unit?
1/4'
Boil the liquid refrigerant out ot the oil within the crankcase
Static pressure - velocity pressure - and total pressure
They are larger

43. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Standard
Side-by-side and over-and-under
20 degrees F

44. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
False
To lower the amount of pressure drop through the coil
18 gauge
Yes

45. What can cause a decrease in suction pressure on an air-conditioning system?
25-ft or 50-ft
Pi x radius squared
It will be high
A dirty evaporator

46. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
High
18 gauge
The suction line or the low-pressure side

47. The A/C size is calculated by what?
Heat load
Rise
SEER includes the energy used in the start-up and shut-down cycles
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

48. Will a dirty condenser cause a rise or fall in pressure?
With an are rating
It rises
Shorted winding - open winding - and grounded winding
Rise

49. Do you need a vent on a push-through evaporator?
S-clips and drives (cleats)
300
30-35 degrees above ambient
Yes

50. What is considered normal operating conditions?
On the common terminal
Rise
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
L-type

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Residential Air Conditioning

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