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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. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
25-ft or 50-ft
Positive
15 A

2. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
In series
Any amount
300
Potential relay and start capacitor

3. What gauge is thermostat wire?
40 degrees F
18 gauge
Inside diameter (ID)
2

4. What is considered normal operating conditions?
8
Shorted winding - open winding - and grounded winding
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
40 A

5. What do you do after you braze a system?
105 degrees F
Pull a vacuum
TXV
False

6. Superheat should never be below how many degrees
5 degrees
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
200
The takeoff fitting

7. The crankcase heater on an air-conditioning compressor is used to what?
Nominal-sized tubing
RLA/FLA x 5
Dehydrated with caps on each end
Boil the liquid refrigerant out ot the oil within the crankcase

8. How is ACR tubing sized?
Indoor fan motor - outdoor fan motor - and the compressor
300
Nominal-sized tubing
Outside diameter (OD)

9. How is the high pressure switch wired with the low pressure switch?
30 A
100 psig
They are larger
In parallel

10. A reciprocating compressor has what sort of moving parts?
Dehydrated with caps on each end
RLA/FLA x 5
Pistons
2 minutes

11. What is a package unit?
A diffuser
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
300
Yes

12. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
45-55%
200
The suction line or the low-pressure side
Infiltration and ventilation

13. In what state is the refrigerant in the compressor?
High
Vapor
20 degrees above ambient
It will be high

14. How are round ducts connected to one another?
30 degrees F
1/4'
With a minimum of three evenly spaced self-tapping screws
A swaging tool

15. What kind of copper tubing is used for plumbing and heating applications?
45 degrees F
Yes
False
Nominal-sized tubing

16. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
The suction line or the low-pressure side
Over/under and side by side
A diffuser

17. If the rpm's are 1050 - how many poles does the motor have?
6
Negative
40 degrees F
8-12 degrees F

18. How many cfm per ton?
400
Positive
TXV
40 degrees F

19. The A/C size is calculated by what?
Rise
Heat load
Compressor
A band 4 inches or more in width

20. How do you calculate EER?
Btu/hr (output) / wattage (input)
Static pressure - velocity pressure - and total pressure
8
Blended refrigerants

21. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
When it is above a conditioned space
Pistons
Over/under and side by side

22. How are round ducts supported?

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23. How many amps can 8 g wire handle?
Yes
40 A
30-35 degrees above ambient
Nominal-sized tubing

24. What is the name of the fitting where the branch line leaves the duct?
400
The takeoff fitting
RLA/FLA x 5
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

25. At what temperature will brazing melt?
Over 800 degrees F
It will have a decrease in superheat
Yes
Nitrogen with a small amount of refrigerant

26. 7' round duct has a ballpark cfm of what?
Standard
150
A piston type metering device
A band 4 inches or more in width

27. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
8
With a minimum of three evenly spaced self-tapping screws
25-ft or 50-ft

28. How many amps can 14 g wire handle?
High
15 A
8
Rise

29. What kind of refrigeratnts must be added in liquid form?
Duct - electrical - and mechanical
Blended refrigerants
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
1/4'

30. What is it called when liquid refrigerant gets into the compressor?
Compressor
They are physically larger
Slugging
SEER includes the energy used in the start-up and shut-down cycles

31. What are the two types of return air systems in residential installations?
Standard
Individual return air systems and central return air systems
Below 800 degrees F
It rises

32. What are normal conditions - as defined by the ARI.
8
A bypass duct or a dump zone
Vapor
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

33. How do you calculate ballpark superheat?
Heat loss
Subtract ambient temperature from 100
When it is a pull-through evaporator
20 A

34. 8' round duct has a ballpark cfm of what?
Individual return air systems and central return air systems
Staples and tape
200
8-12 degrees F

35. How many amps can 10 g wire handle?
It will be high
To lower the amount of pressure drop through the coil
30 A
TXV

36. Where do you apply flux when soldering?
Outside of the male fitting
Duct - electrical - and mechanical
To lower the amount of pressure drop through the coil
On the common terminal

37. 13 SEER is classified as what kind of efficiency?
Any amount
High
5 degrees
20 A

38. Which type of wire can handle a higher ampacity?
Dehydrated with caps on each end
When it is a pull-through evaporator
Stranded
True

39. What type of air conditioning system must be charged using the superheat method?
True
A piston type metering device
Potential relay and start capacitor
Outside of the male fitting

40. What do you use to check for leaks?
To remove humidity and lower dry bulb temperature
Belt drive and direct drive
High
Nitrogen with a small amount of refrigerant

41. How will too much refrigerant effect superheat?
It will be low
A bypass duct or a dump zone
ACR (air-conditioning refrigeration) tubing
With a minimum of three evenly spaced self-tapping screws

42. The fan switch closes at what temperature?
140 degrees F
45-55%
Standard
High

43. The fan switch opens at what temperature?
8
Common
In parallel
105 degrees F

44. How many amps can 12 g wire handle?
20 A
Positive
Pi x radius squared
TXV

45. What are the two basic duct connection configurations for package units supply and return air ducts?
By increasing the surface of the condenser coil
Average feet per minute X area in square feet (H' x W'/144)
Over 800 degrees F
Over/under and side by side

46. What are the two types of package units?
Side-by-side and over-and-under
105 degrees F
400
Common

47. What component changes refrigerant from a low pressure gas to a high pressure gas?
The suction line or the low-pressure side
Compressor
Standard
12000

48. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Subtract ambient temperature from 100
Negative
Individual return air systems and central return air systems

49. Where do you install a trap on a drain line?
200
Positive
Before the vent
Pull a vacuum

50. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
By increasing the surface of the condenser coil
Infiltration and ventilation
Yes
A bypass duct or a dump zone

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Residential Air Conditioning

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