furnace rumble

[jon]

had old airco oil fernace serviced tech #1 changed nossel -rumbled on shut down. day 2 tech #2 said needs this brand of nossel that night starts rumbling all the time, call tech #2 says jam damper closed only worked for a while. day 3tech #3 comes furnace now quiet but have to keep damper shut or noisey anybody know what’s going on here ?

[Tom C]

Sounds like they didnt set it up right. Not only does the nozzle have to be correct size and angle, the smoke level must be set and the over the fire draft is critical to burn properly.. plus the nozzle distance and the spark gap is critical..its not as simple as adjusting the air shutter and or damper. you need to find someone set it up properly. one can not assume that it was set correctly to begin with….

[Author]

Posts