Connecting taco sr501 and hydrostat 3150

benmoussa3

Hi I have a tankless and circulator 1 on Hydrostat 3150 and another zone on Taco SR501, zone 1 works perfectly, however Zone 2 turns on the Circulator 2 but it doesn't fire the boiler... whoever made this install used the Typical Wiring (Cold Start) and didn't connect 6 (N/O) and 5 (COM)... what should I do in this case? I would like Zone 2 to fire the boiler if thermostat is calling for heat. Thanks

Note: TT on boiler is already used by Zone 1 Thermostat

Jamie Hall

I wonder if this is the whole of the wiring? But if it is, there's no reason you can't connect 5 and 6 on your zone relay to T-T on the boiler in parallel with any other thermostat or relay (not, however, in parallel with the one already controlling the same relay...)

Robert O'Brien

If you want the reverse function of 3150 to operate with both zones, wire per middle diagram, if you just want zone 2 to bring on burner, run power from #4 terminal of 501 to ZR on 3150

HVACNUT

Use this one.

benmoussa3

Thank you all

jennis

Hey did you ever get this working on your existing equipment? I have the exact same thing that I’m trying to do. Thanks!