Grounding & Flame Rectification.wmv

Video goes over the basics of flame rectification, the role "ground" plays in a flame rectification circuit, what ground is, how to run a proper ground and how to test your ground with a volt-meter.

[@paulbcote]

Thank you. This is very clearly presented.

[@fritzhvac]

Thank You very much for the GREAT TUTORIAL !!!

[@bodybuildingking]

FaradayToRemember: Yes, the neutral does carry current back to the transformer. It is still required to balance out the 2 hot wires on a 120/240 single phase system. If the main neutral is broken, you will get off-setting voltage on either wire, which is extremely dangerous to equipment in your home. It will still add up to 240, but in bad situations of running a lot of equipment on one side, you can see voltage go to 150 on one leg, while getting 90 on the other... There should never be more then a few volts difference from each other. This an easy way of diagnosing bad neutral connections at the main panel.

[@aftabkhattak685]

Nice work plz share the circuit diagram for the same simulation

[@maness2112]

Bravo! I added this to my favorites.

[@waion4709]

Great video! I tried to disconnect the ground wire from the burner box, but the gas valve is still open,if the micro amp signal travels along this wire back to control board, the gas valve should be de-energized immediately once remove that ground wire,would you explain why,thx

[@TheNYgolfer]

That wire is not the only path to ground for the flame sensing circuit. It's just a backup ground wire.

[@michaelglasser6923]

sounds like robert deniro is teaching this class lol Good job

[@ala1331]

Well explained thank you

[@seshachary5580]

very educative. thank you. regards

[@fourfortyroadrunner]

Only mistake, is the dc current is NOT "called" microamps. DC current is CALLED 'DC current flow." Some amount of microamps IE 5 ua is the AMOUNT of current flow, measured in AMPS, in this case microamps. The flame sensor has NOTHING to do with the line power ground. All it needs is a clean path from the control, flame rod, flame, burner assembly, and back to the ground terminal on the control board.

[@instructor12b]

microamp: A millionth of an Ampere. Ampere is the basic unit for measuring electrical current. Often written as uA, but the u is a plain-text substitute for the Greek letter mu. The voltage at the sensor is ac (alternating current), but because of the great difference in mass between the flame sensor and the furnace chassis, this voltage is “rectified” from ac to dc (direct current), usually less than 10 microamps.

[@jimbarron8688]

​@@instructor12bmany presentations on flame rectification miss the fact that rectification occurs due to the size of the two points connected by the flame being vastly different in size. Well presented.

[@SombraLocs]

What does he mean by varying voltage between neutral and "C" Common? @ 8:52

[@instructor12b]

What I mean by the voltage should not vary is that whatever the voltage was in the test without the unit running, it should be the same when you cycle the unit on.

[@TheRoland444]

excellent presentation

[@IROCZman15]

great video. i have to troubleshoot a possible bad circuit board on my furnace and maybe a grounding issue too.. ....if it is a bad ground, can I just truck in a few yards of topsoil and dump it on/around the furnace to serve as a new earth-ground ??