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Changes in mod burner strategy when you cap the max burner % ?

Dave Carpentier
Dave Carpentier Member Posts: 603
edited September 2022 in THE MAIN WALL
( I'll just invent some numbers, because I dont really know.. )

Say you had a heat call on a modulating boiler, and the load delta temp and speed of the liquid caused the burner to operate at say 100% for the first minute, then 90% for the next, 80% and so on as the in/out delta starts closing.
What happens if you cap the burner to a max of 80% ?
Would it stay at 80% for 4 or 5 minutes or whatnot until it gets back on the same track as before ( aka - burn % is directly linked to in/out delta and the cap is just a simple cap) ?

Or.. does it consider itself sort of "resized" and adopts a burn% strategy profile similar to a smaller unit.
30+ yrs in telecom outside plant.
Currently in building maintenance.