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Residential Air Conditioning

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. How will too much refrigerant effect superheat?
It will be low
Latent and sensible
140 degrees F
300

2. Most duct insulation is made of what?
8-12 degrees F
Fiberglass
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
In series

3. What are the three ways a motor can fail electrically?
In parallel
Slugging
Shorted winding - open winding - and grounded winding
100 psig

4. What can cause a decrease in suction pressure on an air-conditioning system?
Positive
Vapor
When it is a pull-through evaporator
A dirty evaporator

5. How do you calculate cfm?

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6. How do you calculate cfm?

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7. At what temperature will soft solder melt?
Pull a vacuum
Below 800 degrees F
40 degrees F
6

8. Do you need a vent on a pull-through evaporator?
12000
High
Yes
Nominal-sized tubing

9. What do you use to check for leaks?
It rises
Pi x radius squared
Nitrogen with a small amount of refrigerant
Yes

10. What is the design boiling point for most evaporator coils in residential air conditioning?
Heat load
Nominal-sized tubing
Over/under and side by side
40 degrees F

11. How many BTU's per ton?
20 degrees F
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
12000
In series

12. The A/C size is calculated by what?
To remove humidity and lower dry bulb temperature
Heat load
150
Yes

13. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
False
Common
A diffuser

14. The compressor is cooled by liquid refrigerant. (True of False)
Staples and tape
False
Over 800 degrees F
400

15. Where do you check the amps on a motor?
On the common terminal
30 A
Before the vent
Before the vent

16. What can cause a decrease in suction pressure on an air-conditioning system?
No
A dirty evaporator
Compressor
Suction

17. How is the high pressure switch wired with the low pressure switch?
In parallel
False
Average feet per minute X area in square feet (H' x W'/144)
The suction line or the low-pressure side

18. What sort of pressure will a push-through evaporator have?
Yes
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
40 A
Positive

19. Which is more efficient - a TXV or a fixed-orifice metering device?
200
Btu/hr (output) / wattage (input)
Standard
TXV

20. What are the two functions of the air-conditioning system?
To remove humidity and lower dry bulb temperature
4
They are larger
Before the vent

21. How many amps can 10 g wire handle?
30 A
S-clips and drives (cleats)
Slugging
It will be low

22. What is the difference between SEER and EER?
Pistons
SEER includes the energy used in the start-up and shut-down cycles
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Below 800 degrees F

23. What distributes supply air to a room in a structure?
40 A
A diffuser
Heat loss
A piston type metering device

24. What distributes supply air to a room in a structure?
15% silphos
A diffuser
Nominal-sized tubing
TXV

25. A reciprocating compressor has what sort of moving parts?
45-55%
Pistons
Suction
Potential relay and start capacitor

26. How will too much refrigerant effect superheat?
Infiltration and ventilation
Duct with insulation on the inside
It will be low
When the system is under pressure

27. What is the normal evaporator temperature?
45 degrees F
400
Shorted winding - open winding - and grounded winding
SEER includes the energy used in the start-up and shut-down cycles

28. What percentage silver do you need to use for an are-410 system?
15% silphos
Boil the liquid refrigerant out ot the oil within the crankcase
Latent and sensible
4

29. Do you need a trap on a push-through evaporator?
Shorted winding - open winding - and grounded winding
Latent and sensible
No
L-type

30. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
6
Pistons
They are physically larger

31. What is considered normal operating conditions?
12000
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
8
Yes

32. What percentage silver do you need to use for an are-410 system?
4
400
It will be low
15% silphos

33. In what state is the refrigerant in the compressor?
Positive
Suction
SEER includes the energy used in the start-up and shut-down cycles
Vapor

34. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
A band 4 inches or more in width
Stranded
95 degrees F outside - 80 degrees F inside - and 50% relative humidity
In series

35. How are high-efficiency condenser coils different from standard-efficiency condenser coils?
TXV
A diffuser
Latent and sensible
They are physically larger

36. In what length rolls is soft copper tubing normally available?
It will have a decrease in superheat
Common
Heat load
25-ft or 50-ft

37. What are the two ways that fresh air enters a structure?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Infiltration and ventilation
1/4'
L-type

38. What are the two ways that fresh air enters a structure?
Infiltration and ventilation
High
15 A
Shorted winding - open winding - and grounded winding

39. In what length rolls is soft copper tubing normally available?
TXV
25-ft or 50-ft
In series
They are larger

40. 9' round duct has a ballpark cfm of what?
Nominal-sized tubing
300
Staples and tape
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

41. How many cfm per ton?
400
Static pressure - velocity pressure - and total pressure
In series
8-12 degrees F

42. Pressure in ductwork is measured In what?
200
Inches of water column (in. WC)
With 4' saddles
By increasing the surface of the condenser coil

43. On what terminal do you check amperage?
Common
15 A
8
ACR (air-conditioning refrigeration) tubing

44. Will a dirty condenser cause a rise or fall in pressure?
400
Fiberglass
Rise
To lower the amount of pressure drop through the coil

45. How is nominal-sized tubing sized?
Pull a vacuum
Inside diameter (ID)
200
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.

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

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47. Multiple-zone systems often use what to alleviate the problem of excess air when only some zones are calling for conditioning?
Vapor
40 A
Outside of the male fitting
A bypass duct or a dump zone

48. How is flexible duct supported?
4
Inside diameter (ID)
To lower the amount of pressure drop through the coil
A band 4 inches or more in width

49. What do you use to connect square and rectangular ductboard together?
Inches of water column (in. WC)
A bypass duct or a dump zone
S-clips and drives (cleats)
Yes

50. The fan switch opens at what temperature?
30 A
105 degrees F
Outside of the male fitting
400

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Residential Air Conditioning

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