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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. 13 SEER is classified as what kind of efficiency?
105 degrees F
It rises
High
Inclined manometer

2. What kind of metering device do high-efficiency units usually use?
30 degrees F
Yes
TXV
When the system is under pressure

3. How is the high pressure switch wired with the low pressure switch?
2 minutes
In parallel
ACR (air-conditioning refrigeration) tubing
In series

4. 6' round duct has a ballpark cfm of what?
A diffuser
100
15% silphos
Stranded

5. The A/C size is calculated by what?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Yes
Heat load
Common

6. What can cause a decrease in suction pressure on an air-conditioning system?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
Boil the liquid refrigerant out ot the oil within the crankcase
A dirty evaporator
TXV

7. At what temperature will brazing melt?
Over 800 degrees F
Side-by-side and over-and-under
When it is a pull-through evaporator
True

8. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
Duct with insulation on the inside
True
Suction
4

9. How does ACR copper pipe come?
Outside diameter (OD)
Dehydrated with caps on each end
Potential relay and start capacitor
Outside diameter (OD)

10. What is the typical temperature difference between a high-efficiency condenser and the ambient temperature?
Slugging
20 degrees F
45 degrees F
Dehydrated with caps on each end

11. 10' round duct has a ballpark cfm of what?
Yes
400
It will be high
Pistons

12. 6' round duct has a ballpark cfm of what?
Potential relay and start capacitor
A bypass duct or a dump zone
Over 800 degrees F
100

13. What kind of copper tubing is used for plumbing and heating applications?
True
15 A
Negative
Nominal-sized tubing

14. How do you calculate the area of a circle?
Pi x radius squared
It will have a decrease in superheat
Potential relay and start capacitor
Nitrogen with a small amount of refrigerant

15. Most duct insulation is made of what?
20 A
Fiberglass
SEER includes the energy used in the start-up and shut-down cycles
1/4'

16. How do you calculate LRA?
Latent and sensible
RLA/FLA x 5
Before the vent
2

17. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
Heat load
SEER includes the energy used in the start-up and shut-down cycles
Shorted winding - open winding - and grounded winding
It will have a decrease in superheat

18. What is the name of the fitting where the branch line leaves the duct?
The takeoff fitting
Infiltration and ventilation
100
It will be high

19. What is considered normal operating conditions?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
False
300
S-clips and drives (cleats)

20. What are the three major power-consuming devices on an air-conditioning system?
To lower the amount of pressure drop through the coil
ACR (air-conditioning refrigeration) tubing
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Indoor fan motor - outdoor fan motor - and the compressor

21. How do you calculate cfm?

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22. Where do you install a trap on a drain line?
On the common terminal
Before the vent
True
A diffuser

23. At what temperature does refrigerant condense in a high-efficiency unit?
RLA/FLA x 5
Pull a vacuum
20 degrees above ambient
150

24. What sort of pressure will a pull-through evaporator have?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A diffuser
Negative

25. What sort of pressure will a push-through evaporator have?
With an are rating
To remove humidity and lower dry bulb temperature
Positive
To lower the amount of pressure drop through the coil

26. If pressure rises - what happens to the superheat?
Yes
40 degrees F
Btu/hr (output) / wattage (input)
It rises

27. What is a package unit?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Potential relay and start capacitor
45 degrees F
Pull a vacuum

28. What percentage silver do you need to use for an are-410 system?
15% silphos
Pi x radius squared
2
5 degrees

29. If the suction pressure rises - what happens to the head pressure?
Outside diameter (OD)
It also rises
TXV
20 A

30. In what length rolls is soft copper tubing normally available?
45-55%
False
Over/under and side by side
25-ft or 50-ft

31. How do you calculate LRA?
RLA/FLA x 5
Duct with insulation on the inside
8-12 degrees F
When it is a pull-through evaporator

32. What is the design boiling point for most evaporator coils in residential air conditioning?
A swaging tool
40 degrees F
High
Pistons

33. What are the three ways a motor can fail electrically?
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Belt drive and direct drive
Shorted winding - open winding - and grounded winding
200

34. What are the four materials used to make duct?
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
When the system is under pressure
Btu/hr (output) / wattage (input)
Yes

35. Do you need a trap on a push-through evaporator?
Side-by-side and over-and-under
No
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Fiberglass

36. How will an overcharge affect an air-conditioning system with a fixed-orifice type metering device?
8
It will have a decrease in superheat
Pull a vacuum
2 minutes

37. What do you use to check for leaks?
140 degrees F
150
It also rises
Nitrogen with a small amount of refrigerant

38. How is insulation around a duct rated?
False
6
With an are rating
Outside diameter (OD)

39. How is ACR tubing sized?
12000
Outside diameter (OD)
Indoor fan motor - outdoor fan motor - and the compressor
Over/under and side by side

40. What type of air conditioning system must be charged using the superheat method?
A piston type metering device
Slugging
A diffuser
S-clips and drives (cleats)

41. What kind of copper tubing is used for plumbing and heating applications?
Suction
Nominal-sized tubing
When it is above a conditioned space
Pull a vacuum

42. What is the difference between SEER and EER?
SEER includes the energy used in the start-up and shut-down cycles
Slugging
Vapor
20 degrees above ambient

43. 9' round duct has a ballpark cfm of what?
Static pressure - velocity pressure - and total pressure
300
40 degrees F
Standard

44. Why are some ACR tubing lines insulated?
100 psig
Duct with insulation on the inside
Shorted winding - open winding - and grounded winding
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

45. How many BTU's per ton?
ACR (air-conditioning refrigeration) tubing
2
25-ft or 50-ft
12000

46. Do you need a trap on a pull-through evaporator?
Common
Yes
The takeoff fitting
Vapor

47. The load on the evaporater will effect which pressure?
Suction
100
Heat load
With an are rating

48. When do you install a trap on a drain line?
When it is a pull-through evaporator
Fiberglass
By increasing the surface of the condenser coil
They are larger

49. How do you calculate EER?
Btu/hr (output) / wattage (input)
5 degrees
Negative
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

50. The crankcase heater on an air-conditioning compressor is used to what?
Nitrogen with a small amount of refrigerant
Shorted winding - open winding - and grounded winding
Boil the liquid refrigerant out ot the oil within the crankcase
Subtract ambient temperature from 100

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Residential Air Conditioning

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