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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. What are the two ways that fresh air enters a structure?
Heat load
RLA/FLA x 5
It will be low
Infiltration and ventilation

2. Can refrigerant line sets be altered in length?
It will be low
It rises
Yes
45-55%

3. How does ACR copper pipe come?
Dehydrated with caps on each end
Any amount
To remove humidity and lower dry bulb temperature
Rise

4. Sections of duct board can be fastened together with what?
They are larger
Staples and tape
Shorted winding - open winding - and grounded winding
It will be low

5. Where is insulation used on copper tubing used for air-conditioning?
The suction line or the low-pressure side
Blended refrigerants
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Belt drive and direct drive

6. What gauge is thermostat wire?
18 gauge
Latent and sensible
Standard
To remove humidity and lower dry bulb temperature

7. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
2 minutes
Rise
Pull a vacuum

8. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
45 degrees F
To lower the amount of pressure drop through the coil
20 degrees above ambient
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

9. What type of air conditioning system must be charged using the superheat method?
40 A
Stranded
A piston type metering device
Outside diameter (OD)

10. The compressor is cooled by liquid refrigerant. (True of False)
False
Duct with insulation on the inside
40 degrees F
150

11. At what temperature does refrigerant condense in a high-efficiency unit?
2 minutes
4
20 A
20 degrees above ambient

12. The fan switch closes at what temperature?
Infiltration and ventilation
140 degrees F
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
Compressor

13. What kind of copper tubing is used for refrigeration or air-conditioning applications?
False
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
5 degrees
ACR (air-conditioning refrigeration) tubing

14. If pressure rises - what happens to the superheat?
Average feet per minute X area in square feet (H' x W'/144)
Individual return air systems and central return air systems
It rises
400

15. How many BTU's per ton?
TXV
12000
Duct - electrical - and mechanical
A dirty evaporator

16. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
8-12 degrees F
Pistons
A bypass duct or a dump zone
Boil the liquid refrigerant out ot the oil within the crankcase

17. How many amps can 12 g wire handle?
A dirty evaporator
20 A
30 degrees F
A band 4 inches or more in width

18. Pressure in ductwork is measured In what?
Inches of water column (in. WC)
25-ft or 50-ft
When it is a pull-through evaporator
Over/under and side by side

19. Do you need a vent on a push-through evaporator?
Yes
Subtract ambient temperature from 100
TXV
In series

20. How is ACR tubing sized?
Outside diameter (OD)
Over/under and side by side
Any amount
30-35 degrees above ambient

21. What do you do after you braze a system?
Pull a vacuum
A swaging tool
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
300

22. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
It rises
In series
Fiberglass
Nominal-sized tubing

23. What is the normal evaporator temperature?
12000
15% silphos
45 degrees F
When it is a pull-through evaporator

24. What distributes supply air to a room in a structure?
A swaging tool
With 4' saddles
A diffuser
It will be high

25. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
It will be low
A piston type metering device
S-clips and drives (cleats)

26. If the rpm's are 750 - how many poles does the motor have?
It also rises
High
A dirty evaporator
8

27. At what temperature will soft solder melt?
Below 800 degrees F
Pi x radius squared
TXV
Static pressure - velocity pressure - and total pressure

28. Does a package unit come from the factory pre-charged?
Yes
Before the vent
In parallel
The takeoff fitting

29. How is the high pressure switch wired with the low pressure switch?
ACR (air-conditioning refrigeration) tubing
On the common terminal
In parallel
They are physically larger

30. What sort of pressure will a push-through evaporator have?
Positive
12000
A bypass duct or a dump zone
A bypass duct or a dump zone

31. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
45 degrees F
High
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

32. Superheat should never be below how many degrees
Outside of the male fitting
Fiberglass
5 degrees
It will be low

33. If the rpm's are 1050 - how many poles does the motor have?
6
25-ft or 50-ft
RLA/FLA x 5
On the common terminal

34. 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
Duct - electrical - and mechanical
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
On the common terminal

35. How many amps can 8 g wire handle?
2 minutes
40 A
15 A
Duct - electrical - and mechanical

36. The load on the evaporater will effect which pressure?
6
Suction
S-clips and drives (cleats)
True

37. If the rpm's are 3450 - how many poles does the motor have?
RLA/FLA x 5
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
4
2

38. What is used to measure static air pressure in ducts.
It will be low
Inclined manometer
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
SEER includes the energy used in the start-up and shut-down cycles

39. Can refrigerant line sets be altered in length?
TXV
20 A
Yes
200

40. What is the typical pressure differance across a TXV?
300
True
100 psig
Before the vent

41. What sort of pressure will a pull-through evaporator have?
Belt drive and direct drive
Negative
200
Yes

42. The compressor is cooled by liquid refrigerant. (True of False)
1/4'
Individual return air systems and central return air systems
False
40 degrees F

43. What is the range for normal superheat and subcooling?
8-12 degrees F
Potential relay and start capacitor
400
With 4' saddles

44. On what terminal do you check amperage?
By increasing the surface of the condenser coil
Common
When the system is under pressure
200

45. How many amps can 14 g wire handle?
40 degrees F
Subtract ambient temperature from 100
15 A
Blended refrigerants

46. What are the two types of return air systems in residential installations?
Over/under and side by side
By increasing the surface of the condenser coil
Outside diameter (OD)
Individual return air systems and central return air systems

47. The crankcase heater on an air-conditioning compressor is used to what?
Side-by-side and over-and-under
It also rises
Boil the liquid refrigerant out ot the oil within the crankcase
Standard

48. How will too much refrigerant effect subcooling?
18 gauge
It will be high
With an are rating
Individual return air systems and central return air systems

49. What is the difference between SEER and EER?
1/4'
SEER includes the energy used in the start-up and shut-down cycles
100
A bypass duct or a dump zone

50. What do you use to connect square and rectangular ductboard together?
Side-by-side and over-and-under
Yes
40 A
S-clips and drives (cleats)

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Residential Air Conditioning

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