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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. How do you calculate ballpark superheat?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Subtract ambient temperature from 100
Before the vent
It will have a decrease in superheat

2. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Yes
150
It will have a decrease in superheat
Duct with insulation on the inside

3. How is ACR tubing sized?
A piston type metering device
It will be low
Outside diameter (OD)
Compressor

4. What is the name of the fitting where the branch line leaves the duct?
False
Duct - electrical - and mechanical
The takeoff fitting
15% silphos

5. How are round ducts connected to one another?
Compressor
When it is a pull-through evaporator
By increasing the surface of the condenser coil
With a minimum of three evenly spaced self-tapping screws

6. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
In series
With 4' saddles
30-35 degrees above ambient
Latent and sensible

7. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Heat loss
They are physically larger
Standard
Side-by-side and over-and-under

8. Where do you check the amps on a motor?
On the common terminal
RLA/FLA x 5
A diffuser
Rise

9. How are round ducts supported?

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10. Do you need a trap on a push-through evaporator?
No
A band 4 inches or more in width
Yes
When the system is under pressure

11. At what temperature does refrigerant condense in a high-efficiency unit?
Infiltration and ventilation
Below 800 degrees F
Blended refrigerants
20 degrees above ambient

12. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
A swaging tool
Yes
Negative

13. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
It will have a decrease in superheat
Outside diameter (OD)
Over/under and side by side

14. What do you do after you braze a system?
To remove humidity and lower dry bulb temperature
Pull a vacuum
Vapor
20 degrees F

15. Superheat should never be below how many degrees
It will have a decrease in superheat
Suction
5 degrees
SEER includes the energy used in the start-up and shut-down cycles

16. How is the high pressure switch wired with the low pressure switch?
25-ft or 50-ft
In parallel
Negative
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

17. When do you install an auxillary drain pan?
Subtract ambient temperature from 100
2 minutes
When it is above a conditioned space
Side-by-side and over-and-under

18. 13 SEER is classified as what kind of efficiency?
A dirty evaporator
A piston type metering device
Yes
High

19. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
30 degrees F
False
400
A piston type metering device

20. Where do you apply flux when soldering?
20 A
S-clips and drives (cleats)
Average feet per minute X area in square feet (H' x W'/144)
Outside of the male fitting

21. Can refrigerant line sets be altered in length?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
15 A
18 gauge

22. The compressor is cooled by liquid refrigerant. (True of False)
Infiltration and ventilation
Belt drive and direct drive
200
False

23. How will too much refrigerant effect subcooling?
200
It will be high
Average feet per minute X area in square feet (H' x W'/144)
Infiltration and ventilation

24. What are the four materials used to make duct?
RLA/FLA x 5
12000
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Boil the liquid refrigerant out ot the oil within the crankcase

25. What do you use to check for leaks?
1/4'
6
Heat load
Nitrogen with a small amount of refrigerant

26. If the rpm's are 1050 - how many poles does the motor have?
With an are rating
The takeoff fitting
With an are rating
6

27. In what length rolls is soft copper tubing normally available?
TXV
Blended refrigerants
25-ft or 50-ft
Pistons

28. How long should you leave a system off once you kill power before restarting it?
Boil the liquid refrigerant out ot the oil within the crankcase
False
2 minutes
It will have a decrease in superheat

29. Does a package unit come from the factory pre-charged?
When it is a pull-through evaporator
100 psig
20 A
Yes

30. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Yes
Side-by-side and over-and-under
True
Static pressure - velocity pressure - and total pressure

31. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
15 A
Slugging
400

32. Sections of duct board can be fastened together with what?
Yes
Yes
Staples and tape
Blended refrigerants

33. The crankcase heater on an air-conditioning compressor is used to what?
Boil the liquid refrigerant out ot the oil within the crankcase
Inches of water column (in. WC)
A piston type metering device
Outside diameter (OD)

34. What are the three pressures created by moving air in ductwork?
Common
Static pressure - velocity pressure - and total pressure
To remove humidity and lower dry bulb temperature
20 A

35. The furnace size is calculated by what?
Heat loss
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Individual return air systems and central return air systems
A dirty evaporator

36. What is the normal evaporator temperature?
45 degrees F
Shorted winding - open winding - and grounded winding
200
150

37. What are the components of a hard-start kit?
Potential relay and start capacitor
Average feet per minute X area in square feet (H' x W'/144)
Yes
No

38. What tool is used to expand the diameter of soft copper tubing
8-12 degrees F
Outside of the male fitting
Outside of the male fitting
A swaging tool

39. What is the normal evaporator temperature?
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Pistons
18 gauge
45 degrees F

40. What is used to measure static air pressure in ducts.
Btu/hr (output) / wattage (input)
Inclined manometer
Staples and tape
Staples and tape

41. What are the two types of package units?
6
Side-by-side and over-and-under
8
In parallel

42. The fan switch opens at what temperature?
Yes
105 degrees F
150
When it is above a conditioned space

43. What is used to measure static air pressure in ducts.
4
When it is above a conditioned space
The suction line or the low-pressure side
Inclined manometer

44. 7' round duct has a ballpark cfm of what?
On the common terminal
150
High
It rises

45. If the suction pressure rises - what happens to the head pressure?
When it is a pull-through evaporator
Staples and tape
It also rises
Duct with insulation on the inside

46. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
A band 4 inches or more in width
40 degrees F
Nitrogen with a small amount of refrigerant
Before the vent

47. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
25-ft or 50-ft
A bypass duct or a dump zone
In parallel
No

48. What are the components of a hard-start kit?
S-clips and drives (cleats)
Potential relay and start capacitor
Slugging
Outside diameter (OD)

49. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
Any amount
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
25-ft or 50-ft

50. What do you use to check for leaks?
45 degrees F
20 A
When it is above a conditioned space
Nitrogen with a small amount of refrigerant

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Residential Air Conditioning

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