We have a 3 floor house with radiant heat set up as a zone on each floor.  The basement has radiant in slab, with a viega thermostat.  The first floor has warmboard, and there is a veiga temp. sensor.  The second floor has warmboard, and there is a viega thermostat (temp sensor plus built in adjustable dial).

Both thermostats feed into the viega zone control.  The temp sensor from the first floor feeds in to the viega control unit.  The result is that the overall air temperature that controls the main radiant system is the first floor 'zone'.  The basement and second floors are treated as zone with their own temperature adjustment (which in practice will only allow the temperature of that zone to be reduced from the 1st floor zone).

The house also has forced air heat, with the main thermostat next to the radiant temp sensor on the 1st floor.

My problem is that I want the second floor to be 'selectably' warmer than the first floor or basement.  If I set the master radiant room temp in the main viega controller higher, I can adjust the second floor to be warm, and the basement to be cooler using the individual dial thermostats, but the first floor would be very warm, and the forced air would never kick on as the temperature is read from the first floor (I'd like the air to come on now and again to cut down humidity and move air around.)

Is there a way to reconfigure the xones to give me the ability to make the second floor the warmest area *AND* be able to dial it back when needed from the second floor viega temp control?  For instance, can I add a 3rd adjustable viega thermostat on the first floor and wire it as a zone on the zone control?  Or would I be in a situation where the temp sensor tells the radiant to turn on, and the thermostat forces the first floor loops closed, and the pump would run and run with no effect? 

Or is there a way to conveniently adjust the overall radiant temp in the main controller without re-keying a number in - is there a user friendly dial control that could be used, or a viega offset thermostat for the radiant system?

I hope I make sense the way I've described this.

Thanks

i dont know anything about your controller, but these systems are supposed to work like a cookbook, except you can't change the recipe.
It sounds like the air system and hydronic system need to be integrated, maybe with a 2 stage stat on the 1st floor.

What I would do is to sketch up a control diagram. First do what you have, then try to modify it into what you want.