Traditional firetube, watertube or cast iron boiler systems rely on mechanical linkages to control the fuel/air ratio of the burner just like vehicle manufacturers used linkages on carburetors up until the late 1980’s. Similar to the automotive carburetor, linkage systems on boilers are extremely outdated technology. The problem is that linkages get out of calibration, begin to slip and can only control a narrow range of functions on a boiler based on a few inputs. This is typically due to repeated operation and ever changing environmental conditions, much like we are used to in the Northeast.
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