4 Zone

Pete_34

Hi,
I have an Oil Burner, a SR503 Switching relay,a L7224a Aquastat controller and a Honeywell L4080 Aquastat for a hot water tank.I would like the tank to be zone one priority,which leaves 2 zones that can be wired to the SR503,but where do I hookup the fourth zone.I have x1 and x2 from the Sr503 going to tt on the L7224a to operate the boiler when the three zones call for heat,so can the fourth zone be wired to the L7224a???

Help! Pete

Steamhead (in transit)

What I'd do

is install an R845 or similar relay for the fourth zone. Wire the dry contacts from that in parallel with the dry contacts (x1 and x2) on the SR503. The indirect can be the priority zone on the SR503, but the zone on the R845 will not be subject to priority. With this setup, if the SR503 gets stuck in priority for some reason, one heating zone will still work.

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"