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Short Cycling on Vapor System Boilers?
Greetings. I have had a problem on several occasions with boilers installed on vapor systems with orifices, and set to top out at around 8 oz pressure. It appears that the boiler (specifically smaller Utica JE series) is able to pressurize the main pretty quickly, and then short-cycles as the steam is metered to the cold radiators. Once everything is warmed up it settles down, but still, this is not desirable.
In one case I placed the vaporstat at the end of the main with a thermostatic sensor on the pipe which was wired to short past the vaporstat and rely on the boiler pressuretrol set to a couple psi to manage things until the end of the pipe was hot and the vaporstat could take over. In this case the trick worked fine, but other times I've had no luck.
I guess ideally this boiler would have a dual pressure regulator (which I have done elsewhere on a larger boiler - but I didn't install this one, and I don't even know if hi/lo is available). Does anyone have a suggestion for a way to underfire it until it needs full capacity? Or some approach I haven't thought of?