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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. How do you achieve high-efficiency?
By increasing the surface of the condenser coil
Dehydrated with caps on each end
400
20 degrees above ambient

2. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
The suction line or the low-pressure side
40 A
40 degrees F
A dirty evaporator

3. How much does a drain line need to drop per foot of length?

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4. How do you calculate ballpark superheat?
15 A
SEER includes the energy used in the start-up and shut-down cycles
Subtract ambient temperature from 100
Nominal-sized tubing

5. The evaporator is designed to remove what two types of heat?
45 degrees F
20 A
Latent and sensible
30 degrees F

6. What kind of metering device do high-efficiency units usually use?
15 A
TXV
To lower the amount of pressure drop through the coil
30 degrees F

7. If the rpm's are 1050 - how many poles does the motor have?
The suction line or the low-pressure side
Before the vent
30 degrees F
6

8. What type of air conditioning system must be charged using the superheat method?
Belt drive and direct drive
Heat load
Duct with insulation on the inside
A piston type metering device

9. How is the high pressure switch wired with the low pressure switch?
25-ft or 50-ft
Heat load
ACR (air-conditioning refrigeration) tubing
In parallel

10. If the rpm's are 1750 - how many poles does the motor have?
A dirty evaporator
15 A
4
12000

11. If the rpm's are 750 - how many poles does the motor have?
SEER includes the energy used in the start-up and shut-down cycles
8
200
Inclined manometer

12. How is nominal-sized tubing sized?
Slugging
Yes
A dirty evaporator
Inside diameter (ID)

13. If the rpm's are 3450 - how many poles does the motor have?
25-ft or 50-ft
2
False
140 degrees F

14. What are the two types of blower drives?
Pi x radius squared
Rise
Belt drive and direct drive
45 degrees F

15. Do you need a vent on a push-through evaporator?
True
Fiberglass
Yes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

16. How will too much refrigerant effect superheat?
A dirty evaporator
Pistons
Standard
It will be low

17. How long should you leave a system off once you kill power before restarting it?
2 minutes
On the common terminal
The suction line or the low-pressure side
105 degrees F

18. How long should you leave a system off once you kill power before restarting it?
When it is a pull-through evaporator
2 minutes
Boil the liquid refrigerant out ot the oil within the crankcase
Pi x radius squared

19. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
30-35 degrees above ambient
A bypass duct or a dump zone
No
30 A

20. What are the two basic duct connection configurations for package units supply and return air ducts?
300
Over/under and side by side
100 psig
2 minutes

21. Sections of duct board can be fastened together with what?
100 psig
They are physically larger
Staples and tape
Yes

22. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Common
S-clips and drives (cleats)
300

23. What gauge is thermostat wire?
18 gauge
Staples and tape
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
No

24. Where is insulation used on copper tubing used for air-conditioning?
Compressor
No
The suction line or the low-pressure side
Pi x radius squared

25. What is the normal evaporator temperature?
Outside diameter (OD)
Latent and sensible
8-12 degrees F
45 degrees F

26. The load on the evaporater will effect which pressure?
Suction
When the system is under pressure
SEER includes the energy used in the start-up and shut-down cycles
Outside diameter (OD)

27. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
20 degrees F
It rises
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
A band 4 inches or more in width

28. What do you use to check for leaks?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
With 4' saddles
Nitrogen with a small amount of refrigerant
30-35 degrees above ambient

29. How will too much refrigerant effect subcooling?
Yes
It will be low
A piston type metering device
It will be high

30. How many amps can 8 g wire handle?
TXV
40 A
Subtract ambient temperature from 100
S-clips and drives (cleats)

31. The A/C size is calculated by what?
Heat load
Compressor
Average feet per minute X area in square feet (H' x W'/144)
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

32. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
40 A
Heat loss
Outside diameter (OD)

33. On what terminal do you check amperage?
When it is a pull-through evaporator
18 gauge
Common
40 degrees F

34. What kind of metering device do high-efficiency units usually use?
It also rises
Yes
TXV
Pistons

35. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
L-type
15 A
Nominal-sized tubing

36. How is the high pressure switch wired with the low pressure switch?
Fiberglass
With a minimum of three evenly spaced self-tapping screws
In parallel
Indoor fan motor - outdoor fan motor - and the compressor

37. What is the typical pressure differance across a TXV?
100 psig
No
Yes
High

38. Superheat should never be below how many degrees
5 degrees
By increasing the surface of the condenser coil
It will be high
25-ft or 50-ft

39. What tool is used to expand the diameter of soft copper tubing
False
High
Compressor
A swaging tool

40. The load on the evaporater will effect which pressure?
Slugging
Suction
With 4' saddles
Yes

41. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
2 minutes
Negative
18 gauge
They are physically larger

42. What percentage silver do you need to use for an are-410 system?
Boil the liquid refrigerant out ot the oil within the crankcase
15% silphos
Outside of the male fitting
6

43. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
The takeoff fitting
2 minutes
20 degrees F
False

44. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
Compressor
The suction line or the low-pressure side
They are physically larger
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

45. How do you calculate EER?
A band 4 inches or more in width
Btu/hr (output) / wattage (input)
It rises
Yes

46. What kind of copper tubing is used for plumbing and heating applications?
400
By increasing the surface of the condenser coil
Static pressure - velocity pressure - and total pressure
Nominal-sized tubing

47. Will a dirty condenser cause a rise or fall in pressure?
When the system is under pressure
Rise
30-35 degrees above ambient
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

48. When do you install an auxillary drain pan?
45-55%
When it is above a conditioned space
8-12 degrees F
The takeoff fitting

49. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
25-ft or 50-ft
Over 800 degrees F
The takeoff fitting

50. The fan switch closes at what temperature?
140 degrees F
150
To lower the amount of pressure drop through the coil
Inside diameter (ID)

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Residential Air Conditioning

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