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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. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Over/under and side by side
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
8-12 degrees F
To lower the amount of pressure drop through the coil

2. If the rpm's are 750 - how many poles does the motor have?
Pull a vacuum
By increasing the surface of the condenser coil
8
Nominal-sized tubing

3. What are the four materials used to make duct?
Vapor
Boil the liquid refrigerant out ot the oil within the crankcase
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

4. The compressor is cooled by liquid refrigerant. (True of False)
False
It also rises
Stranded
Potential relay and start capacitor

5. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
30 degrees F
Side-by-side and over-and-under
Outside diameter (OD)

6. What kind of copper tubing is used for plumbing and heating applications?
30 A
30-35 degrees above ambient
Nominal-sized tubing
They are physically larger

7. Where do you check the amps on a motor?
On the common terminal
15% silphos
8
Shorted winding - open winding - and grounded winding

8. What are the two types of blower drives?
It will be low
With 4' saddles
18 gauge
Belt drive and direct drive

9. How are the condenser coils different on a high-efficiency unit?
8-12 degrees F
L-type
RLA/FLA x 5
They are larger

10. In what state is the refrigerant in the compressor?
It will have a decrease in superheat
Positive
Vapor
True

11. How many amps can 8 g wire handle?
45 degrees F
Yes
It will have a decrease in superheat
40 A

12. The evaporator is designed to remove what two types of heat?
105 degrees F
Outside diameter (OD)
By increasing the surface of the condenser coil
Latent and sensible

13. How will too much refrigerant effect subcooling?
It will have a decrease in superheat
Rise
6
It will be high

14. What are the three crafts normally associated with an air-conditioned installation?
The takeoff fitting
Duct - electrical - and mechanical
Subtract ambient temperature from 100
Heat load

15. 10' round duct has a ballpark cfm of what?
400
A swaging tool
High
Heat loss

16. How do you calculate cfm?

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17. 6' round duct has a ballpark cfm of what?
Over 800 degrees F
Belt drive and direct drive
100
45-55%

18. At what temperature does refrigerant condense in a standard-efficiency unit?
Nitrogen with a small amount of refrigerant
30-35 degrees above ambient
Heat load
5 degrees

19. What are the three major power-consuming devices on an air-conditioning system?
45 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Indoor fan motor - outdoor fan motor - and the compressor
Rise

20. What kind of refrigeratnts must be added in liquid form?
Btu/hr (output) / wattage (input)
Blended refrigerants
20 A
4

21. What is the typical pressure differance across a TXV?
100 psig
RLA/FLA x 5
The takeoff fitting
15% silphos

22. What do you use to connect square and rectangular ductboard together?
Heat loss
S-clips and drives (cleats)
Potential relay and start capacitor
Compressor

23. At what temperature does refrigerant condense in a high-efficiency unit?
Heat loss
20 degrees above ambient
Individual return air systems and central return air systems
A piston type metering device

24. When must a copper joint never be soldered or brazed?
30-35 degrees above ambient
When the system is under pressure
The suction line or the low-pressure side
200

25. What are the two types of blower drives?
Belt drive and direct drive
15% silphos
It will have a decrease in superheat
On the common terminal

26. Sections of duct board can be fastened together with what?
Static pressure - velocity pressure - and total pressure
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles
Staples and tape

27. Where do you apply flux when soldering?
Outside of the male fitting
15% silphos
100 psig
Yes

28. When must a copper joint never be soldered or brazed?
140 degrees F
Heat load
When the system is under pressure
8-12 degrees F

29. What is lined duct?
Vapor
40 A
Duct with insulation on the inside
A dirty evaporator

30. How many BTU's per ton?
12000
Fiberglass
Pi x radius squared
In parallel

31. How are round ducts connected to one another?
Nominal-sized tubing
With 4' saddles
With a minimum of three evenly spaced self-tapping screws
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

32. Do you need a vent on a pull-through evaporator?
Outside diameter (OD)
Yes
Inches of water column (in. WC)
20 degrees above ambient

33. What is used to measure static air pressure in ducts.
A piston type metering device
It will have a decrease in superheat
4
Inclined manometer

34. When do you install a trap on a drain line?
The suction line or the low-pressure side
Pi x radius squared
When it is a pull-through evaporator
Standard

35. What kind of copper tubing is used for refrigeration or air-conditioning applications?
Standard
ACR (air-conditioning refrigeration) tubing
TXV
400

36. What are the two basic duct connection configurations for package units supply and return air ducts?
It will have a decrease in superheat
With a minimum of three evenly spaced self-tapping screws
Over/under and side by side
Rise

37. What is the design boiling point for most evaporator coils in residential air conditioning?
Common
Pistons
40 degrees F
Staples and tape

38. What are the two types of package units?
With an are rating
Duct - electrical - and mechanical
Side-by-side and over-and-under
Rise

39. Where is insulation used on copper tubing used for air-conditioning?
TXV
Duct - electrical - and mechanical
Staples and tape
The suction line or the low-pressure side

40. Will a dirty condenser cause a rise or fall in pressure?
40 degrees F
Suction
Rise
45-55%

41. On what terminal do you check amperage?
Indoor fan motor - outdoor fan motor - and the compressor
A dirty evaporator
Common
Before the vent

42. What is the normal evaporator temperature?
30 degrees F
On the common terminal
Infiltration and ventilation
45 degrees F

43. Do you need a vent on a push-through evaporator?
Yes
The suction line or the low-pressure side
45-55%
No

44. Do you need a vent on a push-through evaporator?
Pull a vacuum
Yes
140 degrees F
When it is a pull-through evaporator

45. When do you install an auxillary drain pan?
When it is above a conditioned space
Inside diameter (ID)
Any amount
15% silphos

46. The crankcase heater on an air-conditioning compressor is used to what?
When the system is under pressure
ACR (air-conditioning refrigeration) tubing
Boil the liquid refrigerant out ot the oil within the crankcase
Inside diameter (ID)

47. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
30 degrees F
Yes
High

48. How many amps can 14 g wire handle?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
15 A
100 psig
Before the vent

49. Which type of wire can handle a higher ampacity?
Stranded
Yes
20 A
Static pressure - velocity pressure - and total pressure

50. How is flexible duct supported?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A piston type metering device
A band 4 inches or more in width
Nitrogen with a small amount of refrigerant

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Residential Air Conditioning

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