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Posted by Heatpro on December 01, 2005 at 18:59:10:
In Reply to: Re: Change in my repiping/buffer tank schedule posted by HeatPro on December 01, 2005 at 18:39:45:
In the above suggested piping arrangement, the boiler 0010 can continue running. If you want to let it start and stop, you can put the reset to control the circulator with the boiler from the reset sensor at the horizontal manifold tee. A loop subloop system has to have the water available for the subloops whenever thay call. A reset sensor at the manifold makes sure there is a call for circulator with the manifold heated to be ready for the zones.
It is a toss-up as to whether the circulator will last longer having to start and stop, or just run all the time. Running constantly in the primary loop eases the shock of starting. During the heating season, it would usually be running all the time to provide heat.
Your piping suggestion, modified to have the same piping of:
+ the bottom 2-inch to the boiler inlet,
+ the middle 2-inch tap to the boiler outlet.
+ The top 2-inch tap to the supply manifold stub disconnected from the manifold and manifold removed
+ the return stub from the zones piped to a tee on the tank bottom 2-inch boiler inlet line
+ the spirovent and expansion tank on the 1-inch top tank tap.
this would simplify the matter further so it doesn't matter about the boiler circulator running all the time or only boiler burner command.
The zone pumps would take the hot water off the top 2-inch tap and send it to the zones. The tank becomes the zero-balance manifold then.
Your choice.