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Posted by Dave on November 30, 2005 at 06:13:57:
In Reply to: Re: To HeatPro and Joe Brix posted by HeatPro on November 29, 2005 at 22:36:15:
The zone circulator controls do not need to start the boiler burner. An outdoor reset can make the buffer tank warm enough to provide heat when needed to each zone.
+++How I understood the way my system currently is controlled is as follows: We have a Taco controller SR506 (I believe). Whenever a zone circ is running, the boiler pump also runs. The boiler itself just seems to fire when the operating temperature of the water in the boiler loop is below about 150 degrees. Once it reaches its high limit, which it does fairly often, the boiler shuts down, but if a zone pump is still running, then the boiler pump continues to pump until the water temp drops below 150, and then the boiler fires again. There are temp sensors in the header next to the boiler inlet and boiler outflow. So it seems like the boiler fires totally independently of the the circulators. I would assume that the tank wouldn't change anything....water would circulate in tank/boiler loop whenever a zone is calling for heat. Once the temp of water gets below 150, boiler will fire. Once water temp gets to 180 (operating temp), burner would shut off.
Does that make sense?