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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 are round ducts supported?

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2. How many cfm per ton?
8-12 degrees F
400
A diffuser
Staples and tape

3. What is used to measure static air pressure in ducts.
Side-by-side and over-and-under
TXV
Inclined manometer
Duct - electrical - and mechanical

4. What are the two types of blower drives?
25-ft or 50-ft
Belt drive and direct drive
Standard
Heat loss

5. The evaporator is designed to remove what two types of heat?
100
Latent and sensible
8
A diffuser

6. If the suction pressure rises - what happens to the head pressure?
With 4' saddles
105 degrees F
RLA/FLA x 5
It also rises

7. What are the three pressures created by moving air in ductwork?
100 psig
Pi x radius squared
TXV
Static pressure - velocity pressure - and total pressure

8. How is flexible duct supported?
Stranded
S-clips and drives (cleats)
Yes
A band 4 inches or more in width

9. The fan switch opens at what temperature?
5 degrees
With an are rating
105 degrees F
40 degrees F

10. How do you calculate EER?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Btu/hr (output) / wattage (input)
150
It will have a decrease in superheat

11. How do you calculate EER?
Potential relay and start capacitor
18 gauge
Btu/hr (output) / wattage (input)
TXV

12. How many amps can 10 g wire handle?
Suction
30 A
2
140 degrees F

13. What kind of metering device do high-efficiency units usually use?
TXV
Side-by-side and over-and-under
ACR (air-conditioning refrigeration) tubing
Positive

14. Superheat should never be below how many degrees
L-type
When it is a pull-through evaporator
5 degrees
Staples and tape

15. Where is insulation used on copper tubing used for air-conditioning?
High
Suction
Negative
The suction line or the low-pressure side

16. The furnace size is calculated by what?
Heat loss
Average feet per minute X area in square feet (H' x W'/144)
With 4' saddles
It will be high

17. What are the three major power-consuming devices on an air-conditioning system?
Pistons
Indoor fan motor - outdoor fan motor - and the compressor
150
Dehydrated with caps on each end

18. How many amps can 14 g wire handle?
15 A
Pull a vacuum
To remove humidity and lower dry bulb temperature
400

19. The fan switch closes at what temperature?
140 degrees F
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Dehydrated with caps on each end
Below 800 degrees F

20. What are the two ways that fresh air enters a structure?
By increasing the surface of the condenser coil
Infiltration and ventilation
Slugging
In series

21. Does a package unit come from the factory pre-charged?
Rise
Btu/hr (output) / wattage (input)
When the system is under pressure
Yes

22. The crankcase heater on an air-conditioning compressor is used to what?
Pull a vacuum
Boil the liquid refrigerant out ot the oil within the crankcase
300
Pi x radius squared

23. Do you need a trap on a pull-through evaporator?
20 degrees above ambient
Outside diameter (OD)
Duct - electrical - and mechanical
Yes

24. How will too much refrigerant effect superheat?
SEER includes the energy used in the start-up and shut-down cycles
To lower the amount of pressure drop through the coil
It will be low
30 A

25. If the rpm's are 750 - how many poles does the motor have?
By increasing the surface of the condenser coil
Pi x radius squared
40 A
8

26. How does ACR copper pipe come?
Dehydrated with caps on each end
30 A
A bypass duct or a dump zone
40 degrees F

27. 6' round duct has a ballpark cfm of what?
No
6
Blended refrigerants
100

28. In what state is the refrigerant in the compressor?
In series
Compressor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Vapor

29. If the rpm's are 750 - how many poles does the motor have?
Yes
Indoor fan motor - outdoor fan motor - and the compressor
Dehydrated with caps on each end
8

30. What are normal conditions - as defined by the ARI.
L-type
Negative
Pi x radius squared
95 degrees F outside - 80 degrees F inside - and 50% relative humidity

31. The furnace size is calculated by what?
18 gauge
Standard
Standard
Heat loss

32. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Infiltration and ventilation
20 degrees above ambient
Yes
40 degrees F

33. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
It will have a decrease in superheat
Vapor
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Shorted winding - open winding - and grounded winding

34. How are round ducts connected to one another?
With an are rating
Heat loss
With a minimum of three evenly spaced self-tapping screws
Common

35. What is it called when liquid refrigerant gets into the compressor?
40 A
Duct - electrical - and mechanical
18 gauge
Slugging

36. How are round ducts supported?

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37. What type of air conditioning system must be charged using the superheat method?
ACR (air-conditioning refrigeration) tubing
Static pressure - velocity pressure - and total pressure
Duct - electrical - and mechanical
A piston type metering device

38. How do you calculate cfm?

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39. What do you use to connect square and rectangular ductboard together?
40 degrees F
Boil the liquid refrigerant out ot the oil within the crankcase
Over/under and side by side
S-clips and drives (cleats)

40. What is the name of the fitting where the branch line leaves the duct?
Indoor fan motor - outdoor fan motor - and the compressor
The takeoff fitting
Standard
20 degrees above ambient

41. How do you calculate the area of a circle?
Stranded
Pi x radius squared
Staples and tape
High

42. Does a package unit come from the factory pre-charged?
A dirty evaporator
Blended refrigerants
Yes
15% silphos

43. How does ACR copper pipe come?
150
Inside diameter (ID)
Nitrogen with a small amount of refrigerant
Dehydrated with caps on each end

44. Do you need a vent on a pull-through evaporator?
Yes
25-ft or 50-ft
30 A
To remove humidity and lower dry bulb temperature

45. How do you achieve high-efficiency?
Side-by-side and over-and-under
5 degrees
A swaging tool
By increasing the surface of the condenser coil

46. What is it called when liquid refrigerant gets into the compressor?
Slugging
40 degrees F
The suction line or the low-pressure side
18 gauge

47. What are the components of a hard-start kit?
L-type
Common
Potential relay and start capacitor
It rises

48. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
Positive
40 degrees F
Static pressure - velocity pressure - and total pressure
L-type

49. Where is insulation used on copper tubing used for air-conditioning?
Yes
Inclined manometer
The suction line or the low-pressure side
In series

50. How is nominal-sized tubing sized?
With 4' saddles
Static pressure - velocity pressure - and total pressure
The takeoff fitting
Inside diameter (ID)

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Residential Air Conditioning

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