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Posted by HeatPro on November 29, 2005 at 22:36:15:
In Reply to: Re: To HeatPro and Joe Brix posted by Dave on November 29, 2005 at 22:17:45:
: OK, so even though the supply and return headers on my system are both apped on the ends (deadended), the system works because of the boiler loop with its closely spaced tees, right?
+++ Right. The problem of losing your circulator, banging and sizzling was caused by rapidly overheating water in the primary loop and boiler tubes because not enough of the water could always be used by the independent subloops coming off the headers. The buffer tank in the primary loop provides mass and time to compensate for insufficient draws at times off the zero-balance headers that the zones are attached to.
The water will circulate between tank and boiler and get pumped out to zones via header as needed.
+++ Yes. 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. The buffer tank outdoor reset control will fire the burner independently of the loads, so there is no redundant overlapping demand from all the zones to make the water overheat.