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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. If the rpm's are 1050 - how many poles does the motor have?
20 A
6
140 degrees F
Potential relay and start capacitor

2. What is it called when liquid refrigerant gets into the compressor?
Heat load
Slugging
On the common terminal
150

3. A reciprocating compressor has what sort of moving parts?
In parallel
20 degrees F
Slugging
Pistons

4. If the rpm's are 3450 - how many poles does the motor have?
Latent and sensible
When it is a pull-through evaporator
Yes
2

5. A reciprocating compressor has what sort of moving parts?
Suction
Fiberglass
When the system is under pressure
Pistons

6. Which is more efficient - a TXV or a fixed-orifice metering device?
Yes
40 degrees F
TXV
Any amount

7. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
To lower the amount of pressure drop through the coil
140 degrees F
Pull a vacuum
Yes

8. 10 SEER is classified as what kind of efficiency?
Standard
False
It will have a decrease in superheat
Dehydrated with caps on each end

9. If the rpm's are 1750 - how many poles does the motor have?
With a minimum of three evenly spaced self-tapping screws
RLA/FLA x 5
300
4

10. What do you do after you braze a system?
Pull a vacuum
Indoor fan motor - outdoor fan motor - and the compressor
Over 800 degrees F
Standard

11. In what state is the refrigerant in the compressor?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
Vapor
Negative
Yes

12. The fan switch closes at what temperature?
With 4' saddles
140 degrees F
Yes
Yes

13. When do you install an auxillary drain pan?
Yes
1/4'
45-55%
When it is above a conditioned space

14. How does ACR copper pipe come?
Individual return air systems and central return air systems
40 degrees F
By increasing the surface of the condenser coil
Dehydrated with caps on each end

15. What are the three major power-consuming devices on an air-conditioning system?
20 degrees above ambient
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
Pistons

16. What are the three ways a motor can fail electrically?
Over/under and side by side
Shorted winding - open winding - and grounded winding
400
Pull a vacuum

17. How is ACR tubing sized?
Shorted winding - open winding - and grounded winding
Dehydrated with caps on each end
Outside diameter (OD)
8-12 degrees F

18. How do you calculate EER?
400
1/4'
Btu/hr (output) / wattage (input)
Compressor

19. What are the two basic duct connection configurations for package units supply and return air ducts?
Average feet per minute X area in square feet (H' x W'/144)
140 degrees F
12000
Over/under and side by side

20. Where do you install a trap on a drain line?
A bypass duct or a dump zone
Inclined manometer
Before the vent
Vapor

21. What kind of copper tubing is used for plumbing and heating applications?
Nominal-sized tubing
20 degrees above ambient
Below 800 degrees F
They are larger

22. What is lined duct?
100
In parallel
Duct with insulation on the inside
Yes

23. Do you need a vent on a pull-through evaporator?
Yes
Pi x radius squared
40 degrees F
Rise

24. At what temperature will soft solder melt?
Below 800 degrees F
With a minimum of three evenly spaced self-tapping screws
Suction
It will have a decrease in superheat

25. 6' round duct has a ballpark cfm of what?
Compressor
When the system is under pressure
100
It will be low

26. 8' round duct has a ballpark cfm of what?
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
200
A dirty evaporator
Duct - electrical - and mechanical

27. The A/C size is calculated by what?
Common
Positive
Heat load
Dehydrated with caps on each end

28. 8' round duct has a ballpark cfm of what?
Yes
15% silphos
200
To lower the amount of pressure drop through the coil

29. How long should you leave a system off once you kill power before restarting it?
TXV
Dehydrated with caps on each end
When the system is under pressure
2 minutes

30. 9' round duct has a ballpark cfm of what?
300
Shorted winding - open winding - and grounded winding
With 4' saddles
To remove humidity and lower dry bulb temperature

31. Pressure in ductwork is measured In what?
With 4' saddles
Any amount
Inches of water column (in. WC)
Yes

32. Where is insulation used on copper tubing used for air-conditioning?
High
It will be high
The suction line or the low-pressure side
It will be low

33. How many BTU's per ton?
30 degrees F
Belt drive and direct drive
12000
It will be high

34. The evaporator is designed to remove what two types of heat?
When it is a pull-through evaporator
Shorted winding - open winding - and grounded winding
Latent and sensible
Yes

35. Superheat should never be below how many degrees
Compressor
30 degrees F
Nominal-sized tubing
5 degrees

36. What component changes refrigerant from a low pressure gas to a high pressure gas?
TXV
Compressor
15 A
Subtract ambient temperature from 100

37. How do you calculate ballpark superheat?
Subtract ambient temperature from 100
Inches of water column (in. WC)
Fiberglass
15 A

38. What do you do after you braze a system?
400
Pull a vacuum
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

39. How is the high pressure switch wired with the low pressure switch?
100
The takeoff fitting
In parallel
A dirty evaporator

40. The compressor is cooled by liquid refrigerant. (True of False)
Infiltration and ventilation
45-55%
False
Duct with insulation on the inside

41. Will a dirty condenser cause a rise or fall in pressure?
2
Rise
Boil the liquid refrigerant out ot the oil within the crankcase
With a minimum of three evenly spaced self-tapping screws

42. Which type of wire can handle a higher ampacity?
100 psig
8
Stranded
Pull a vacuum

43. What are the four materials used to make duct?
Potential relay and start capacitor
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
On the common terminal
The takeoff fitting

44. Where do you check the amps on a motor?
Over 800 degrees F
Staples and tape
On the common terminal
Yes

45. If the rpm's are 1750 - how many poles does the motor have?
Side-by-side and over-and-under
4
The suction line or the low-pressure side
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line

46. How do you calculate cfm?

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47. Do you need a trap on a pull-through evaporator?
Yes
8
30-35 degrees above ambient
Shorted winding - open winding - and grounded winding

48. How do you calculate EER?
4
Inclined manometer
Common
Btu/hr (output) / wattage (input)

49. How do you calculate ballpark superheat?
Inches of water column (in. WC)
2 minutes
S-clips and drives (cleats)
Subtract ambient temperature from 100

50. What can cause a decrease in suction pressure on an air-conditioning system?
A dirty evaporator
With 4' saddles
Before the vent
With an are rating

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Residential Air Conditioning

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