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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. What type of air conditioning system must be charged using the superheat method?
It will be low
A piston type metering device
The suction line or the low-pressure side
Before the vent

2. In what state is the refrigerant in the compressor?
Vapor
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
A band 4 inches or more in width
100 psig

3. How do you calculate cfm?

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4. If the rpm's are 3450 - how many poles does the motor have?
Average feet per minute X area in square feet (H' x W'/144)
2
RLA/FLA x 5
It will have a decrease in superheat

5. What is a package unit?
Dehydrated with caps on each end
An air-conditioning system that has all four components (compressor - condenser - metering device - and evaporator) in one housing.
By increasing the surface of the condenser coil
Vapor

6. What is considered normal operating conditions?
400
12000
With an are rating
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity

7. The load on the evaporater will effect which pressure?
20 degrees above ambient
Suction
1/4'
Btu/hr (output) / wattage (input)

8. How will too much refrigerant effect subcooling?
20 degrees above ambient
It will be high
In parallel
Over/under and side by side

9. What are the two types of package units?
Side-by-side and over-and-under
1/4'
ACR (air-conditioning refrigeration) tubing
Suction

10. How are the high pressure switch and the low pressure switch wired with the compressor contactor?
Subtract ambient temperature from 100
In series
Dehydrated with caps on each end
Static pressure - velocity pressure - and total pressure

11. The crankcase heater on an air-conditioning compressor is used to what?
To remove humidity and lower dry bulb temperature
100 psig
Boil the liquid refrigerant out ot the oil within the crankcase
Heat loss

12. Which type of wire can handle a higher ampacity?
Indoor fan motor - outdoor fan motor - and the compressor
To keep refrigerant from absorbing heat and to prevent condensation from forming on the line
Stranded
Sheet metal - galvanized sheet metal - fiberglass - and flexduct

13. What sort of pressure will a pull-through evaporator have?
Rise
Pi x radius squared
Staples and tape
Negative

14. Does a package unit come from the factory pre-charged?
SEER includes the energy used in the start-up and shut-down cycles
Yes
A swaging tool
Individual return air systems and central return air systems

15. What do you use to connect square and rectangular ductboard together?
Outside of the male fitting
Negative
S-clips and drives (cleats)
Potential relay and start capacitor

16. Which is more efficient - a TXV or a fixed-orifice metering device?
100
TXV
Pistons
Before the vent

17. How many amps can 12 g wire handle?
Indoor fan motor - outdoor fan motor - and the compressor
Btu/hr (output) / wattage (input)
20 A
With a minimum of three evenly spaced self-tapping screws

18. Square sheet metal duct is normally fabricated in a sheet metal shop and assembled in the field. (True or False)
True
Dehydrated with caps on each end
Yes
30 A

19. A reciprocating compressor has what sort of moving parts?
Yes
Pistons
To remove humidity and lower dry bulb temperature
100 psig

20. How are round ducts connected to one another?
Subtract ambient temperature from 100
Potential relay and start capacitor
With a minimum of three evenly spaced self-tapping screws
15% silphos

21. What is the typical pressure differance across a TXV?
True
Infiltration and ventilation
Common
100 psig

22. Will a dirty condenser cause a rise or fall in pressure?
Rise
40 degrees F
Sheet metal - galvanized sheet metal - fiberglass - and flexduct
15% silphos

23. What are the two basic duct connection configurations for package units supply and return air ducts?
Over/under and side by side
12000
Fiberglass
A dirty evaporator

24. What sort of pressure will a push-through evaporator have?
On the common terminal
Positive
2 minutes
8

25. What is the typical temperature difference between a standard-efficiency condenser and the ambient temperature?
A band 4 inches or more in width
30 degrees F
6
It rises

26. Do you need a vent on a push-through evaporator?
100
They are physically larger
Heat load
Yes

27. Do you need a vent on a pull-through evaporator?
Below 800 degrees F
ACR (air-conditioning refrigeration) tubing
Yes
Duct with insulation on the inside

28. 10 SEER is classified as what kind of efficiency?
Yes
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Standard
Fiberglass

29. The fan switch opens at what temperature?
200
A dirty evaporator
Vapor
105 degrees F

30. What are the three crafts normally associated with an air-conditioned installation?
Duct - electrical - and mechanical
Individual return air systems and central return air systems
8-12 degrees F
Inside diameter (ID)

31. Superheat should never be below how many degrees
Duct - electrical - and mechanical
5 degrees
Side-by-side and over-and-under
Btu/hr (output) / wattage (input)

32. The refrigerant within the evaporator will typically boil at what temperature when it is 75 degrees inside with a relative humidity of 50%?
40 degrees F
Inclined manometer
2
Individual return air systems and central return air systems

33. Which type of wire can handle a higher ampacity?
2 minutes
45-55%
Heat load
Stranded

34. What gauge is thermostat wire?
Duct - electrical - and mechanical
S-clips and drives (cleats)
18 gauge
20 degrees F

35. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
L-type
400
30-35 degrees above ambient
Nitrogen with a small amount of refrigerant

36. How is nominal-sized tubing sized?
Inside diameter (ID)
Inclined manometer
Shorted winding - open winding - and grounded winding
When it is a pull-through evaporator

37. What are the components of a hard-start kit?
When it is above a conditioned space
Potential relay and start capacitor
Subtract ambient temperature from 100
RLA/FLA x 5

38. Why is it necessary to have multiple refrigerant circuits in some evaporator coils?
Over 800 degrees F
To lower the amount of pressure drop through the coil
In parallel
45-55%

39. What is the design boiling point for most evaporator coils in residential air conditioning?
S-clips and drives (cleats)
Heat load
8
40 degrees F

40. When do you install an auxillary drain pan?
When it is above a conditioned space
When the system is under pressure
30 degrees F
18 gauge

41. If the rpm's are 1050 - how many poles does the motor have?
Outside diameter (OD)
6
It will be low
45 degrees F

42. 13 SEER is classified as what kind of efficiency?
High
20 A
100
Outside diameter (OD)

43. The furnace size is calculated by what?
A swaging tool
8
Heat loss
They are larger

44. How long should you leave a system off once you kill power before restarting it?
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Any amount
2 minutes
Heat load

45. The A/C size is calculated by what?
With a minimum of three evenly spaced self-tapping screws
75 degrees F dry bulb indoor - 95 degrees F drybulb outdoor - and 50% relative humidity
Heat load
Belt drive and direct drive

46. What standard weight copper tubing is most often used in the heating and air-conditioning industry?
140 degrees F
2 minutes
When the system is under pressure
L-type

47. What are the two ways that fresh air enters a structure?
It also rises
Static pressure - velocity pressure - and total pressure
Infiltration and ventilation
20 degrees F

48. How is nominal-sized tubing sized?
Common
Inside diameter (ID)
300
15% silphos

49. How is the high pressure switch wired with the low pressure switch?
Negative
Common
In parallel
25-ft or 50-ft

50. Do you need a vent on a push-through evaporator?
Duct with insulation on the inside
15 A
Yes
45-55%

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Residential Air Conditioning

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