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Residential Air Conditioning

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Answer 50 questions in 15 minutes.
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1. When must a copper joint never be soldered or brazed?
45 degrees F
45-55%
When the system is under pressure
A dirty evaporator

2. What are the two ways that fresh air enters a structure?
100
To remove humidity and lower dry bulb temperature
A piston type metering device
Infiltration and ventilation

3. What sort of pressure will a pull-through evaporator have?
Outside of the male fitting
To lower the amount of pressure drop through the coil
Below 800 degrees F
Negative

4. In what state is the refrigerant in the compressor?
200
Vapor
Heat load
With an are rating

5. What is a package unit?
40 A
8
8-12 degrees F
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

6. The compressor is cooled by liquid refrigerant. (True of False)
False
45-55%
Positive
ACR (air-conditioning refrigeration) tubing

7. What are the three pressures created by moving air in ductwork?
Static pressure - velocity pressure - and total pressure
Yes
400
Heat loss

8. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
ACR (air-conditioning refrigeration) tubing
1/4'
To remove humidity and lower dry bulb temperature

9. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
They are physically larger
RLA/FLA x 5
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Latent and sensible

10. How much superheat do you need to prevent liquid refrigerant from entering the compressor?
30-35 degrees above ambient
30 A
TXV
Any amount

11. If the suction pressure rises - what happens to the head pressure?
20 degrees above ambient
Infiltration and ventilation
It also rises
RLA/FLA x 5

12. Sections of duct board can be fastened together with what?
18 gauge
100 psig
Fiberglass
Staples and tape

13. Where do you check the amps on a motor?
15 A
Positive
On the common terminal
Side-by-side and over-and-under

14. What sort of pressure will a push-through evaporator have?
20 degrees F
Standard
Positive
Any amount

15. Why are some ACR tubing lines insulated?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
SEER includes the energy used in the start-up and shut-down cycles
L-type

16. How many cfm per ton?
100
400
A bypass duct or a dump zone
Yes

17. How many amps can 12 g wire handle?
RLA/FLA x 5
With 4' saddles
40 A
20 A

18. Which is more efficient - a TXV or a fixed-orifice metering device?
TXV
Common
They are physically larger
It also rises

19. What percentage silver do you need to use for an are-410 system?
Yes
They are larger
Positive
15% silphos

20. How is insulation around a duct rated?
400
Yes
TXV
With an are rating

21. How are round ducts supported?

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22. At what temperature will brazing melt?
Heat loss
Over 800 degrees F
High
Pi x radius squared

23. How many amps can 10 g wire handle?
It will be high
Boil the liquid refrigerant out ot the oil within the crankcase
Compressor
30 A

24. How many amps can 14 g wire handle?
A diffuser
15 A
Yes
When it is a pull-through evaporator

25. What do you use to connect square and rectangular ductboard together?
Below 800 degrees F
S-clips and drives (cleats)
30 A
2 minutes

26. What is the normal evaporator temperature?
45 degrees F
With a minimum of three evenly spaced self-tapping screws
Compressor
Pi x radius squared

27. Will a dirty condenser cause a rise or fall in pressure?
In parallel
Staples and tape
Rise
45-55%

28. What is lined duct?
Belt drive and direct drive
Duct with insulation on the inside
It will have a decrease in superheat
6

29. Why are some ACR tubing lines insulated?
A band 4 inches or more in width
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
200
Yes

30. What are the components of a hard-start kit?
With 4' saddles
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
12000
Potential relay and start capacitor

31. What are the three major power-consuming devices on an air-conditioning system?
Indoor fan motor - outdoor fan motor - and the compressor
No
Outside of the male fitting
Average feet per minute X area in square feet (H' x W'/144)

32. How are round ducts supported?

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33. Do you need a trap on a pull-through evaporator?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
30 degrees F
Yes
In series

34. How will too much refrigerant effect superheat?
It also rises
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
It will be low
ACR (air-conditioning refrigeration) tubing

35. If the rpm's are 750 - how many poles does the motor have?
8
TXV
Pi x radius squared
Below 800 degrees F

36. How do you achieve high-efficiency?
Inches of water column (in. WC)
2
By increasing the surface of the condenser coil
Potential relay and start capacitor

37. Superheat should never be below how many degrees
Nominal-sized tubing
15 A
5 degrees
Yes

38. What is used to measure static air pressure in ducts.
5 degrees
Inclined manometer
140 degrees F
Yes

39. Do you need a trap on a pull-through evaporator?
Yes
Standard
SEER includes the energy used in the start-up and shut-down cycles
It will have a decrease in superheat

40. What kind of refrigeratnts must be added in liquid form?
Static pressure - velocity pressure - and total pressure
15% silphos
Blended refrigerants
400

41. Most duct insulation is made of what?
Fiberglass
When it is above a conditioned space
Shorted winding - open winding - and grounded winding
TXV

42. The load on the evaporater will effect which pressure?
Belt drive and direct drive
L-type
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Suction

43. What is the design boiling point for most evaporator coils in residential air conditioning?
40 degrees F
It rises
ACR (air-conditioning refrigeration) tubing
Dehydrated with caps on each end

44. How will too much refrigerant effect superheat?
Nitrogen with a small amount of refrigerant
No
Suction
It will be low

45. How does ACR copper pipe come?
Dehydrated with caps on each end
20 degrees F
Fiberglass
18 gauge

46. What is the design boiling point for most evaporator coils in residential air conditioning?
A dirty evaporator
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
40 degrees F
It also rises

47. How will too much refrigerant effect subcooling?
It will be high
30 A
Pull a vacuum
Potential relay and start capacitor

48. How many amps can 8 g wire handle?
With an are rating
TXV
40 A
S-clips and drives (cleats)

49. What is the typical pressure differance across a TXV?
A diffuser
40 degrees F
100 psig
L-type

50. Where do you check the amps on a motor?
On the common terminal
Duct - electrical - and mechanical
Vapor
400

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Residential Air Conditioning

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