After finding the owners manual I now understand how the boiler controls function, keeping a fire burning all the time unless the boiler is shut down (fuel stops being fed) do to a high limit overheat situation.It has a set pilot mode, either every 6 minutes for 2 minutes or every 14 minutes for 2 minutes. There is a dump zone, per code when it was installed ~ since not a requirement ~ but have never needed it. It will also shut completely down if it reaches its high limit. It isn't like an oiler boiler, it runs at the low limit. The high limit is the shut off point, and will cycle back on automatically once it cools down. That has only happened twice in 4 years that I know of.
It is the oldest (the PB 150, not mine specifically) operating biomass boiler in North America. The furnaces have been around even longer.
/r/_ylt=A0oG7hg.HxBRlgYA2iBXNyoA;_ylu=X3oDMTE0cW0zOGx2BHNlYwNzcgRwb3MDNQRjb2xvA2FjMgR2dGlkA01TWTAwMl83OA--/SIG=12np9dli7/EXP=1360039870/**http%3a//www.pinnaclestove.com/wp-content/uploads/2011/03/pb150mn.pdf