Radiant with mod/con

Boston

This diagram is exactly what I want to do - except I would pipe off the secondary of the w-m ultra.

Why couldn't I use constant circulation on the radiant circuit controling the radiant mixing valve with a TACO i-series mixing valve with outdoor reset?

Isn't that real simple? Radinat is floor warming only, the hydo air will play catch up via the thermostat, the radiant will just chug along andkick in whatever BTU's the mixing valve supply based on the taco i-series reset curve.

Any help or thouht would be greatly appreciated.

Diagram was from Ted G, not sure who originally supplied it. The ultra pri/sec is new to me, this is how I would pipe off a normal boiler.

Thanks for the help.