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Posted by HeatPro on March 22, 2008 at 14:01:20:
In Reply to: short cycling and poor heat distribution posted by Pete T on January 28, 2008 at 18:52:02:
black char (dust) on the floor under the boiler indicates overfiring or bad combustion. Someone might have missed the gas meter clocking and/or gas pressure adjustment. A firing chamber can't have excessive heat when adjusted to factory specs; which means draft is sufficient to carry combustion products up the flue instead of being held back.
If the maximum steam pressure is less than 1.5 psig, hammering is a result of piping errors.
Excessive gas usage can be from inadequate boiler sizing making almost constant firing, although without a starting point for comparison that can be arbitrary as to what is considered excessive.
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