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NATE Air Conditioning Components

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
Capillary action
The heating control circuit
Must be coiled horizontally and the vapor must flow from top to bottom
This will prevent settling of the ground - which can cause refrigerant line damage

2. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The blower relay coil
The accumulator
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Must be coiled horizontally and the vapor must flow from top to bottom

3. Which part of the system prevents liquid from entering the compressor...
Metering device (restrictor)
The accumulator
Compressor
24 volts

4. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
The coil is precharged with nitrogen
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator

5. When installing an evaporator coil - before soldering - the end of the evaporator lines must be opened to the atmosphere because...
The coil is precharged with nitrogen
Evaporator
Compressor
Must be located in a conspicuous place to serve as an alarm

6. Quick-connect fittings are commonly used on...
The receiver
Condenser
Precharged refrigeration linesets
The blower relay coil

7. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Refrigerant must be added to the system
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
This will prevent settling of the ground - which can cause refrigerant line damage

8. What must be done to the system when a condensing unit is precharged for 25' of refrigerant line and uses 32' of refrigerant line...
Refrigerant must be added to the system
Have a minimum perimeter of 3' larger than the unit being served
The receiver
Evaporator

9. The part of an air conditioning system that changes the refrigerant from a high-pressure gas to a high-pressure liquid is the...
Condenser
24 volts
This will prevent settling of the ground - which can cause refrigerant line damage
To prevent condensation from forming

10. What type of fitting uses an O-ring to help seal its joint...
A compression fitting
Near a return-air grill
Check for tight connections at electrical terminals
Insulated

11. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
208-volt/240-volt single-phase power supply
Condenser
Have a minimum perimeter of 3' larger than the unit being served
To prevent condensation from forming

12. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
The contactor coil
The lines must be covered by PVC to prevent contact with the masonry material
The cooling contactor coil

13. What is the purpose for insulating a suction line...
The cooling contactor coil
To prevent condensation from forming
The coil is precharged with nitrogen
Near a return-air grill

14. The part of an air conditioning system that changes the refrigerant from a low-pressure gas to a high-pressure gas is the...
The accumulator
Compressor
Refrigerant must be added to the system
The coil is precharged with nitrogen

15. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Evaporator
Precharged refrigeration linesets
Check for tight connections at electrical terminals

16. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
The lines must be covered by PVC to prevent contact with the masonry material
The heating control circuit
Insulated

17. What type of metering device is used on a 12 SEER split air conditioning system...
24 volts
To prevent condensation from forming
A TXV
The blower relay coil

18. What is the 'Y' terminal used for on the thermostat...
The cooling contactor coil
24 volts
Have a minimum perimeter of 3' larger than the unit being served
The heating control circuit

19. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
The blower relay coil
A compression fitting

20. What is the 'W' terminal used for on the thermostat...
The blower relay coil
The heating control circuit
Evaporator
Must be coiled horizontally and the vapor must flow from top to bottom

21. A normally closed float switch that is connected to an auxiliary drain pan should be wired to control...
Evaporator
The contactor coil
The power from the transformer
The lines must be covered by PVC to prevent contact with the masonry material

22. Quick-connect fittings are commonly used on...
A compression fitting
Metering device
Precharged refrigeration linesets
Have a minimum perimeter of 3' larger than the unit being served

23. A secondary drain line...
Must be located in a conspicuous place to serve as an alarm
The contactor coil
Condenser
The receiver

24. An auxiliary drain pan must...

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25. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Compressor
The coil is precharged with nitrogen
208-volt/240-volt single-phase power supply
24 volts

26. When installing a refrigeration line set through a masonry wall
The lines must be covered by PVC to prevent contact with the masonry material
The heating control circuit
Condenser
Must be located in a conspicuous place to serve as an alarm

27. The part of an air conditioning system that changes the refrigerant from a high-pressure liquid to a low-pressure liquid is the...
Near a return-air grill
Must be located in a conspicuous place to serve as an alarm
Condenser
Metering device

28. What is the 'G' terminal used for on the thermostat...
Evaporator
Insulated
The blower relay coil
The lines must be covered by PVC to prevent contact with the masonry material

29. To ensure proper oil return to the compressor - when installing a refrigeration line set...
Have a minimum perimeter of 3' larger than the unit being served
24 volts
The coil is precharged with nitrogen
The suction line must be pitched toward the condensing unit

30. In a sealed system - as the pressure increases...
Condenser
24 volts
Precharged refrigeration linesets
The temperature increases

31. A secondary drain line...
The cooling contactor coil
A compression fitting
Must be located in a conspicuous place to serve as an alarm
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

32. To ensure proper oil return to the compressor - a coiled refrigeration lineset...
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
Must be coiled horizontally and the vapor must flow from top to bottom
Insulated
Metering device (restrictor)

33. Where does the refrigerant change from a low-pressure gas to a high-pressure gas...
Evaporator
Capillary action
Compressor
This will prevent settling of the ground - which can cause refrigerant line damage

34. Why is it recommended to add a gravel fill under the pad of a condensing unit...
The contactor coil
A compression fitting
24 volts
This will prevent settling of the ground - which can cause refrigerant line damage

35. What is the 'G' terminal used for on the thermostat...
The blower relay coil
Refrigerant must be added to the system
A compression fitting
The lines must be covered by PVC to prevent contact with the masonry material

36. Where does the refrigerant change from a high-pressure gas to a high-pressure liquid...
Compressor
The contactor coil
Condenser
A compression fitting

37. A split-system air conditioning unit has...
Condenser
The receiver
Check for tight connections at electrical terminals
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator

38. Residential split-system outdoor condensing units are commonly wired with a...
Condenser
Evaporator
The receiver
208-volt/240-volt single-phase power supply

39. What is the secondary voltage on a step-down control transformer for a residential furnace...
Capillary action
24 volts
Condenser
Metering device (restrictor)

40. Which part of the system stores refrigerant until it is needed in the evaporator...
Condenser
The receiver
The compressor and condenser connected by a refrigeration line set to the metering device and evaporator
208-volt/240-volt single-phase power supply

41. Where does the refrigerant change from a low-pressure liquid to a low-pressure gas...
The temperature increases
Evaporator
The receiver
The contactor coil

42. What is the purpose for insulating a suction line...
The blower relay coil
24 volts
Evaporator
To prevent condensation from forming

43. What is the secondary voltage on a step-down control transformer for a residential furnace...
Compressor
A compression fitting
The coil is precharged with nitrogen
24 volts

44. A room thermostat should be mounted...
The power from the transformer
Near a return-air grill
The temperature increases
The blower relay coil

45. The part of an air conditioning system that changes the refrigerant from a low-pressure liquid to a low-pressure gas is the...
Evaporator
To prevent condensation from forming
A compression fitting
24 volts

46. Residential split-system outdoor condensing units are commonly wired with a...
Precharged refrigeration linesets
208-volt/240-volt single-phase power supply
Metering device (restrictor)
The suction line must be pitched toward the condensing unit

47. Where does the refrigerant change from a high-pressure liquid to a low-pressure liquid...
Metering device (restrictor)
Must be located in a conspicuous place to serve as an alarm
To prevent condensation from forming
The lines must be covered by PVC to prevent contact with the masonry material

48. When soldering a copper connection and solder is drawn into the joint - This is commonly called...
A compression fitting
A TXV
Capillary action
To prevent condensation from forming

49. What is the 'are' terminal used for on the thermostat...
Near a return-air grill
Insulated
Metering device
The power from the transformer

50. In a sealed system - as the pressure increases...
The temperature increases
208-volt/240-volt single-phase power supply
Precharged refrigeration linesets
Evaporator

Can you answer 50 questions in 15 minutes?

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NATE Air Conditioning Components

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