wiring

drhvac

I recently posted about installing underfloor radiant. I'm at the point now of wiring. The old system was a 2 zone baseboard system using honeywll zone valves, with a circulator. I also have a Tekmar 256 outdoor reset control conected to the system. I re-piped it with primary secondary loop. What is the best way to wire this system? I have 3 circulators, 1 in the primary loop, 1 with the baseboard zones, and the other with the radiant zones. I want the primary to be energized when either zone is on, and the zone circs to come on when their zone is calling for heat. What relay or relay would work best with this set up?

thx

MikeG

Switching relay

Look at the Taco line of switching relays ie. SR503.  They can handle the boiler pump, individual zone pumps and DHW pump if needed.  Simple easy to wire and expandable.  I use one for a four zone heating application with DHW.  Grundfos also carries a line.