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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. At what temperature does refrigerant condense in a standard-efficiency unit?
A diffuser
Before the vent
30-35 degrees above ambient
Pistons

2. How many amps can 12 g wire handle?
Outside diameter (OD)
Duct - electrical - and mechanical
On the common terminal
20 A

3. If the rpm's are 1050 - how many poles does the motor have?
18 gauge
6
Yes
With an are rating

4. Where do you check the amps on a motor?
8-12 degrees F
On the common terminal
Outside diameter (OD)
15 A

5. A reciprocating compressor has what sort of moving parts?
Outside diameter (OD)
Indoor fan motor - outdoor fan motor - and the compressor
Inches of water column (in. WC)
Pistons

6. What are the two types of blower drives?
Heat load
20 degrees above ambient
Belt drive and direct drive
SEER includes the energy used in the start-up and shut-down cycles

7. What are normal conditions - as defined by the ARI.
Shorted winding - open winding - and grounded winding
Yes
To lower the amount of pressure drop through the coil
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

8. What distributes supply air to a room in a structure?
When the system is under pressure
40 A
A diffuser
Outside diameter (OD)

9. What is the design boiling point for most evaporator coils in residential air conditioning?
When it is above a conditioned space
40 degrees F
Suction
Over/under and side by side

10. At what temperature does refrigerant condense in a standard-efficiency unit?
Inside diameter (ID)
30-35 degrees above ambient
105 degrees F
With an are rating

11. Why are some ACR tubing lines insulated?
In parallel
Compressor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
40 degrees F

12. How are the condenser coils different on a high-efficiency unit?
18 gauge
With a minimum of three evenly spaced self-tapping screws
They are larger
40 A

13. Does a package unit come from the factory pre-charged?
When it is above a conditioned space
Yes
Stranded
To lower the amount of pressure drop through the coil

14. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
SEER includes the energy used in the start-up and shut-down cycles
Blended refrigerants
20 degrees F
Suction

15. What are the four materials used to make duct?
When the system is under pressure
Stranded
RLA/FLA x 5
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

16. Will a dirty condenser cause a rise or fall in pressure?
It will have a decrease in superheat
Rise
When the system is under pressure
25-ft or 50-ft

17. Where do you apply flux when soldering?
A swaging tool
4
Outside of the male fitting
Static pressure - velocity pressure - and total pressure

18. What are the three major power-consuming devices on an air-conditioning system?
40 degrees F
Indoor fan motor - outdoor fan motor - and the compressor
A diffuser
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

19. 7' round duct has a ballpark cfm of what?
Pistons
15% silphos
Shorted winding - open winding - and grounded winding
150

20. What is the difference between SEER and EER?
Inches of water column (in. WC)
They are physically larger
SEER includes the energy used in the start-up and shut-down cycles
When it is a pull-through evaporator

21. In what state is the refrigerant in the compressor?
2
Vapor
Heat loss
15% silphos

22. What distributes supply air to a room in a structure?
8-12 degrees F
A bypass duct or a dump zone
A diffuser
Individual return air systems and central return air systems

23. Which type of wire can handle a higher ampacity?
Indoor fan motor - outdoor fan motor - and the compressor
Outside diameter (OD)
Stranded
High

24. What type of air conditioning system must be charged using the superheat method?
It rises
45 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A piston type metering device

25. The fan switch opens at what temperature?
100 psig
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes
105 degrees F

26. If the rpm's are 3450 - how many poles does the motor have?
2
With 4' saddles
True
4

27. How many cfm per ton?
To remove humidity and lower dry bulb temperature
S-clips and drives (cleats)
140 degrees F
400

28. What are the two ways that fresh air enters a structure?
2 minutes
A swaging tool
ACR (air-conditioning refrigeration) tubing
Infiltration and ventilation

29. Do you need a trap on a push-through evaporator?
Vapor
No
Duct with insulation on the inside
It will have a decrease in superheat

30. What sort of pressure will a pull-through evaporator have?
Inclined manometer
When the system is under pressure
A swaging tool
Negative

31. What are the two functions of the air-conditioning system?
TXV
1/4'
Yes
To remove humidity and lower dry bulb temperature

32. The A/C size is calculated by what?
Heat load
40 degrees F
Potential relay and start capacitor
15 A

33. What is lined duct?
Yes
Pi x radius squared
Duct with insulation on the inside
When the system is under pressure

34. What is a package unit?
100
Individual return air systems and central return air systems
A swaging tool
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

35. How will too much refrigerant effect subcooling?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
It will be high
2
25-ft or 50-ft

36. Will a dirty condenser cause a rise or fall in pressure?
30 degrees F
Rise
When it is above a conditioned space
In parallel

37. The evaporator is designed to remove what two types of heat?
To remove humidity and lower dry bulb temperature
100 psig
Latent and sensible
False

38. What is used to measure static air pressure in ducts.
TXV
Individual return air systems and central return air systems
It will be low
Inclined manometer

39. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Outside diameter (OD)
Latent and sensible
S-clips and drives (cleats)

40. Can refrigerant line sets be altered in length?
Belt drive and direct drive
Yes
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Inside diameter (ID)

41. The fan switch closes at what temperature?
150
Outside of the male fitting
Side-by-side and over-and-under
140 degrees F

42. What kind of metering device do high-efficiency units usually use?
Any amount
Duct with insulation on the inside
TXV
They are physically larger

43. What is the design boiling point for most evaporator coils in residential air conditioning?
Average feet per minute X area in square feet (H' x W'/144)
Outside of the male fitting
5 degrees
40 degrees F

44. Do you need a vent on a push-through evaporator?
No
105 degrees F
8
Yes

45. How do you calculate cfm?

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46. Do you need a trap on a push-through evaporator?
2
A swaging tool
No
Over/under and side by side

47. 6' round duct has a ballpark cfm of what?
Yes
Subtract ambient temperature from 100
Outside diameter (OD)
100

48. At what temperature will brazing melt?
S-clips and drives (cleats)
Yes
105 degrees F
Over 800 degrees F

49. How do you achieve high-efficiency?
RLA/FLA x 5
By increasing the surface of the condenser coil
Negative
Below 800 degrees F

50. When do you install a trap on a drain line?
TXV
When it is a pull-through evaporator
400
5 degrees

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Residential Air Conditioning

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