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I hope that simple answer helped u. I just had registered in this forum. It was late and was tired. Neutral is used on 120 V. circuits. Common works like neutral, but on 24 V. circuits. I hope this...

How exactly do you get all the air out of a hot water system with gas boiler?
Keep on allowing the water from the supply line run through the lines individually and opening the purge valve on the...

N-neutral
C-common