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Can I control 2 circulator pumps with 1 thermostat

ryan242
ryan242 Member Posts: 21
I have an old house with radiators throughout, there has been a 2 room addition put on years before I moved into it and they added a baseboard in each room and a thermostat back there to control a circulator just for those 2 baseboards, problem is it won’t turn on the boiler, only the main thermostat turns on the boiler, I’d like to get that circulator to run the same time as the main circulator which turns the boiler on. Right now I have a Beckett aquasmart control for the main thermostat/circulator which also controls the boiler and the other thermostat is hooked to a Honeywell Ra89a relay they just controls the circulator. Sometimes that circulator will run when the boiler is cold which is useless since it’s set up as a cold start, just trying to figure out how to get both circulators to run at the same time and eliminate the 2nd thermostat 

Comments

  • SuperTech
    SuperTech Member Posts: 1,792
    If that is what you want to do you can just wire the 2nd circulator to the same terminals on the Aquasmart. You could also wire the thermostat to the same TT terminals on the Aquasmart as well if you don't want to get rid of the second thermostat. It's not the solution that I would go with. I think the best thing you can do is to get a circulator zone control board such as the Taco SR-503. This will allow you to wire the thermostat and circulator to their own relays that will energize the circulator and switch on the boiler independent of the other zones.
    Zman
  • Derheatmeister
    Derheatmeister Member Posts: 1,280
    Depends......
    Piping layout/design/control strategies and wiring will have to be considered.
  • Robert_25
    Robert_25 Member Posts: 406
    The wiring guide for your aquastat shows how to do this. A wire between the ZR terminal in the aquastat and the power for your circulator should allow you to have two independent zones that each fire the boiler on a heat call.  If you are not experienced with electrical work call someone that is.
    ryan242
  • Derheatmeister
    Derheatmeister Member Posts: 1,280
    Do we know the piping layout...Two pumps could end up fighting each other.
  • ryan242
    ryan242 Member Posts: 21
    Robert_25 said:
    The wiring guide for your aquastat shows how to do this. A wire between the ZR terminal in the aquastat and the power for your circulator should allow you to have two independent zones that each fire the boiler on a heat call.  If you are not experienced with electrical work call someone that is.
    So by that you mean run a wire from the ZR terminal and wire nut in with the hot wire going to the Second circulator? I’ve done some electrical before but never on these aquastats or relays, thanks for your help