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Posted by jeff on October 14, 2009 at 07:47:22:
In Reply to: Re: Short cycle time on gas steam boiler posted by HeatPro on October 13, 2009 at 22:14:18:
: First, check that the thermostat anticipator is not below 0.2 setting. Set too low, the anticipator heats the bimetal too fast and disconnects the burner to cool down and restart fast.
>> Is this anticipator in the wall thermostat or something on the furnace?
Thanks
: Also check the flame sensor, it can cause fast shutoff cycles.
: When a boiler has too big a burner, and not enough air venting from the main and radiator vents, it can produce steam fast, shutting off the burner due to building up pressure.