Hello mn91, welcome to the forum. I have a concern with your proposed flue-temp switch. I don't know what are normal temperatures in the flue of your boiler, but I think you could get into a situation where the boiler is just idling, burning just enough of a fire to keep the fire going, then if the house calls for heat, starts the circulator pumps running which brings lots of cool or cold water into the boiler, couldn't the flue temps drop enough that the temp sensor would think the fire has gone out, even though it hasn't? And the sensor would open, not allowing the burner to run?
If you have experienced the fire going out because of low demand on the boiler during warm days, your burner should have a timer on it that will activate for a minute or two every 30 minutes or hour and push coal onto the grate,and run the combustion blower to keep the fire going in an 'idle' or 'pilot' condition.
Maybe your older Keystoker doesn't have a keep-lit timer? Does your burner have one motor running the blower and the pusher mechanism? Sometimes during warm weather the chimney draft is too low to keep enough air pulled through the grate to keep a minimum fire burning. Some people have hooked up a second 'auxilary' blower that is aimed at the main blower inlet, this runs full time, forcing a small amount of air through the grate augmenting the lack of draft from the chimney.
If you describe your situation that you experienced and are trying to prevent, maybe we can help better. Describe your chimeny too.
Do you have any photos of the unit installed? Maybe post one in the photos of your stove thread or with your reply..
Last edited by LsFarm
on Sun Jul 08, 2007 10:16 am, edited 1 time in total.