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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 high-efficiency unit?
By increasing the surface of the condenser coil
Yes
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
20 degrees above ambient

2. What percentage silver do you use to braze two dissimilar metals such as steel and copper?
When the system is under pressure
8-12 degrees F
45-55%
Side-by-side and over-and-under

3. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
S-clips and drives (cleats)
It will have a decrease in superheat
30 A
Over 800 degrees F

4. The compressor is cooled by liquid refrigerant. (True of False)
When it is above a conditioned space
The suction line or the low-pressure side
30-35 degrees above ambient
False

5. Which is more efficient - a TXV or a fixed-orifice metering device?
A bypass duct or a dump zone
300
Slugging
TXV

6. What are the three crafts normally associated with an air-conditioned installation?
Nominal-sized tubing
15% silphos
When the system is under pressure
Duct - electrical - and mechanical

7. How is nominal-sized tubing sized?
45 degrees F
Positive
Inside diameter (ID)
It rises

8. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
A bypass duct or a dump zone
Blended refrigerants
TXV
Heat load

9. When do you install a trap on a drain line?
Before the vent
It rises
When it is a pull-through evaporator
Belt drive and direct drive

10. 6' round duct has a ballpark cfm of what?
It will be low
100
Inclined manometer
They are physically larger

11. 6' round duct has a ballpark cfm of what?
100
Duct - electrical - and mechanical
A diffuser
Heat load

12. Will a dirty condenser cause a rise or fall in pressure?
Rise
Positive
Infiltration and ventilation
Stranded

13. Sections of duct board can be fastened together with what?
30-35 degrees above ambient
Individual return air systems and central return air systems
Yes
Staples and tape

14. How many amps can 14 g wire handle?
Outside diameter (OD)
15 A
It also rises
Any amount

15. If the rpm's are 1750 - how many poles does the motor have?
20 degrees above ambient
Inches of water column (in. WC)
4
30-35 degrees above ambient

16. How many BTU's per ton?
Yes
On the common terminal
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
12000

17. What type of air conditioning system must be charged using the superheat method?
Average feet per minute X area in square feet (H' x W'/144)
A piston type metering device
4
By increasing the surface of the condenser coil

18. What can cause a decrease in suction pressure on an air-conditioning system?
Average feet per minute X area in square feet (H' x W'/144)
100
A dirty evaporator
Subtract ambient temperature from 100

19. What component changes refrigerant from a low pressure gas to a high pressure gas?
Pistons
Heat load
Compressor
Side-by-side and over-and-under

20. The evaporator is designed to remove what two types of heat?
Latent and sensible
Btu/hr (output) / wattage (input)
Outside of the male fitting
6

21. Sections of duct board can be fastened together with what?
Staples and tape
With 4' saddles
TXV
Below 800 degrees F

22. How do you calculate ballpark superheat?
Common
Subtract ambient temperature from 100
40 A
Outside diameter (OD)

23. What can cause a decrease in suction pressure on an air-conditioning system?
Over 800 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
A dirty evaporator
5 degrees

24. What component changes refrigerant from a low pressure gas to a high pressure gas?
45-55%
Compressor
A dirty evaporator
It will have a decrease in superheat

25. If the rpm's are 1050 - how many poles does the motor have?
6
Heat load
Fiberglass
Indoor fan motor - outdoor fan motor - and the compressor

26. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
105 degrees F
It will have a decrease in superheat
Staples and tape

27. How many cfm per ton?
The suction line or the low-pressure side
Pi x radius squared
Yes
400

28. Do you need a trap on a push-through evaporator?
No
15% silphos
Individual return air systems and central return air systems
On the common terminal

29. What are the three ways a motor can fail electrically?
Shorted winding - open winding - and grounded winding
Heat loss
2
When the system is under pressure

30. What type of air conditioning system must be charged using the superheat method?
15 A
A bypass duct or a dump zone
A piston type metering device
Pi x radius squared

31. Most duct insulation is made of what?
When it is a pull-through evaporator
400
With a minimum of three evenly spaced self-tapping screws
Fiberglass

32. At what temperature does refrigerant condense in a standard-efficiency unit?
30-35 degrees above ambient
Inside diameter (ID)
105 degrees F
ACR (air-conditioning refrigeration) tubing

33. What are the three pressures created by moving air in ductwork?
RLA/FLA x 5
40 degrees F
Static pressure - velocity pressure - and total pressure
Btu/hr (output) / wattage (input)

34. Does a package unit come from the factory pre-charged?
2
Yes
Pistons
Positive

35. How is insulation around a duct rated?
A dirty evaporator
Yes
With an are rating
The suction line or the low-pressure side

36. What are the two basic duct connection configurations for package units supply and return air ducts?
Rise
ACR (air-conditioning refrigeration) tubing
40 degrees F
Over/under and side by side

37. Pressure in ductwork is measured In what?
When it is a pull-through evaporator
Inches of water column (in. WC)
1/4'
L-type

38. What are the two types of blower drives?
Outside of the male fitting
Belt drive and direct drive
Dehydrated with caps on each end
In parallel

39. What are the two types of return air systems in residential installations?
Individual return air systems and central return air systems
Staples and tape
Heat load
Rise

40. How are the condenser coils different on a high-efficiency unit?
They are larger
2 minutes
RLA/FLA x 5
Side-by-side and over-and-under

41. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Rise
40 degrees F
Suction
True

42. Do you need a vent on a pull-through evaporator?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Negative
A band 4 inches or more in width
Yes

43. Do you need a trap on a pull-through evaporator?
Yes
40 degrees F
Compressor
Below 800 degrees F

44. How many cfm per ton?
400
Yes
140 degrees F
Suction

45. How do you calculate the area of a circle?
Vapor
To lower the amount of pressure drop through the coil
Pi x radius squared
RLA/FLA x 5

46. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
Suction
Belt drive and direct drive
Vapor
30 degrees F

47. Will a dirty condenser cause a rise or fall in pressure?
Pi x radius squared
45-55%
Rise
2 minutes

48. What is considered normal operating conditions?
Yes
It also rises
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Subtract ambient temperature from 100

49. How do you calculate ballpark superheat?
Duct - electrical - and mechanical
Rise
Subtract ambient temperature from 100
Boil the liquid refrigerant out ot the oil within the crankcase

50. How many amps can 8 g wire handle?
TXV
Nitrogen with a small amount of refrigerant
The suction line or the low-pressure side
40 A

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Residential Air Conditioning

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