2022 Light Commercial Systems Quiz

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Question 1 of 18

1. Question
How many relays are on the central terminal board?
- 7
- 4
- 0
Correct

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Question 2 of 18

2. Question
The thermostat reversing valve wire is connected to W1 on commercial heat pumps?
- True
- False
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Question 3 of 18

3. Question
Does DFT1 or DFT2 initiate defrost on 2 circuit commercial heat pumps?
- DFT1
- DFT2
- None of the above
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Question 4 of 18

4. Question
If you replace the central terminal board on a heat pump you must cut Jumpers 5,6,7,
- True
- False
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Question 5 of 18

5. Question
Is the hall effect sensor for draft proving or flame sensing?
- Draft Proving
- Flame sensing
- None of the above
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Question 6 of 18

6. Question
It is critical to make sure you have the correct voltage Ignition gas control board when replacing?
- True
- False
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Question 7 of 18

7. Question
Carrier’s HumidiMizer option is for adding humidity inside the building?
- True
- False
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Question 8 of 18

8. Question
The Second 2 digits in the unit’s serial indicate the months the unit was built?
- True
- False
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Question 9 of 18

9. Question
You can adjust the equipment’s airflow with the VFD drive?
- True
- False
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Question 10 of 18

10. Question
VFD Drives do not require any Maintenance?
- True
- False
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Question 11 of 18

11. Question
If the 48/50 JC variable speed compressor is running backwards you switch any 2 legs of the unit’s power supply to reverse rotation?
- True
- False
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Question 12 of 18

12. Question
ECO Blue Axial fan units require the airflow to be field adjusted at start up?
- True
- Flase
Correct

Incorrect
Question 13 of 18

13. Question
The 10Volts Dc in the Axial fan motor is supplied from the unit’s circuit board?
- True
- False
Correct

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Question 14 of 18

14. Question
What is need if a VFD units power supply has a high leg / stinger leg?
- Isolation delta wye transformer
- Larger fuses
- 24vac accessory transformer
Correct

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Question 15 of 18

15. Question
RTU’s with System Vu can run without a conventional Thermostat?
- True
- False
Correct

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Question 16 of 18

16. Question
You must move the txv bulbs on commercial air handlers to outside the cabinet and mount them on the suction lines?
- True
- False
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Question 17 of 18

17. Question
An external space temperature sensor is required for System Vu units to operate without a conventional thermostat?
- True
- False
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Question 18 of 18

18. Question
Will I practice what I have learned today? And do my best to represent my industry as a professional?
- Yes
- No
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