Posted by jtown on August 22, 2001 at 06:29:19:
In Reply to: Burner Nozzles posted by Chris on August 21, 2001 at 20:59:45:
Anyone writing should give the model and size of the boiler also. Most boilers are rated for several firing rates, with lower rates usually a little more efficient. I would go with the .75 or smaller if it heats up quickly enough to not have condensation in the flueways etc. Nozzles are matched to the airflow pattern for that burner/boiler/environment combination and can be finicky to set up with trying several nozzles until you get one right. Be careful putting everything back together. Adjustments should be done while testing CO2 and stack temp. A combustion test of the clean boiler showing 85% or whatever the boiler might reach in combustion efficiency would answer whether the current nozzle is ok. Also a good stack damper that swings freely and is never all the way open or shut too much, showing that the draft (air flow pattern) is kept even seasonally.