I am laying out an installation of 2 Weil McLain 380 steam gas gun fired boilers feeding into a common supply which will be stage fired based on heating needs. I plan on using the Carlin 201 gas burners. Since steam from an on boiler will be condensing in the off boiler, we are looking at ways to reduce standby losses of the off boiler. Due to the load profile of the building ( a church) the second boiler will probably only need to be fired about 12 hours a week during the heating season.
We have a vent height limit of about 60 inches, so we are planning on using the back venting option on the boilers to increase our available working height.
I have 2 questions:
1) Is there any problem with putting the barometric damper on the horizontal outlet flue pipe of the boiler off a side tee.
2) Since the boilers are in a boiler room with its own outdoor air supply, I would prefer to install the stack dampers on the outlet of the boiler before the barometric damper to lock the heat in the boiler, rather that letting it dump out into the boiler room through the double acting gas barometric damper. This would be very similar to the vent damper installation used on commercial gas water heaters... the damper is installed below the draft hood opening. I expect installing the damper in this location would be more effective for this boiler installation and especially when the barometric is double acting.... the double acting will probably allow increased spillage of heat when compared to a single acting barometric used for oil.
If we install the damper directly on the boiler outlet the barometric could be moved to the vertical exhaust pipe going up to the common vent manifold.
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