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Carlin gas conversion on Weil cast iron boiler - draft too high
I have a Weil McLain WGO-6 boiler that was converted 7 years ago to propane with a Carlin EZ-GAS burner. I decided to check the draft the other day when it was really cold since the tall chimney (40' from the breech) has caused draft issues in the past (while on oil). The specs call for -.02 and I can't get any lower than 0 holding the damper wide open. The flue is 7" round. Combustion air comes from outside. It seems to me that I need to either increase damper flow to satisfy the chimney without pulling so hard through the boiler, or restrict the draft somewhat between the boiler and the damper. If I am on the right track, would it make sense to upgrade the 7" Field MG1 to 8". It's mounted in bullhead tee which is only 7" all around. so I think I would need to replace the flue pipe from the damper to the chimney with the larger size. Something like: boiler-> 7" pipe-> 7-to-8-reducer-> new 8" bullhead tee-> 8" pipe to the chimney. Does this make sense or is there a better approach?