One or two draft regulators?

bruce_21

I went to a job where there are two oil burners (a bock HWH and a furnace) going into one chimney thru a tee in the breeching. Does both these burners need a draft regulator?

STEVEusaPA

If both appliance call for a regulator then yes, and maybe one after the tee.
Best would be to check draft cold at chimney base and before each regulator, then check as each one fires, and both firing.

SWEI

From the Field Controls Contractor Reference Guide

ChrisJ

Are there conditions where you'd use multiple regulators?
Say one for each appliance, plus a third on the flue? Or would you double up at each appliance?

Mark Eatherton

I had a 22 story tall building with an 3.5 mil atmospheric boiler that not only required dual barometric dampers, but it also required me t install a restrictive orifice in the flue breaching of the boiler to slow the flow of flue gas down and give it a chance to exchange energy. Dropped the buildings fuel consumption by 40% just with that one effort alone. Dropped it an additional 30% when we base loaded the system and DHW loads with three 199 modcons. So, yes, there are situations where numerous dampers are required.

ME

bruce_21

Thanks for the help!