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Taco 506 & 504 Wiring for primary circulator pump

pghrichpghrich Posts: 9Member
I had this system re-piped to 2" and installed a primary circulator pump. The problem that I have is that i cant get both the 506 & 504 to turn on the pump when the thermostats call for heat. The one will work but, not the other. Is this a dip switch setting issue?



Comments

  • IronmanIronman Posts: 5,463Member
    edited January 12
    A couple of things:
    1. how are you calling the boiler on without the end switches?
    2. you a jumper on "ZC to ZR" to power the pumps unless the system has an indirect with a pump controlled by the boiler.
    3. you also need to connect the "Net" terminals between the panels.

    Never mind about the first question. I see you're using a tankless water heater instead of a boiler. That's a mistake.
    Bob Boan


    You can choose to do what you want, but you cannot choose the consequences.
  • duffy_4duffy_4 Posts: 69Member
    I think your pressure reducing/back flow valve might be installed incorrectly.
  • pecmsgpecmsg Posts: 1,134Member
    Is the Pri / Sec piping correct???
  • pghrichpghrich Posts: 9Member
    To make this work, it looks to me that the Primary Circuit for the primary circulator need to be paralleled from one board to the other. These are on two different 20a circuits.

    Is their a way to have the SR506 board tell the SR504 to turn this pump on and off without do the above? Thanks.
  • IronmanIronman Posts: 5,463Member
    pghrich said:

    To make this work, it looks to me that the Primary Circuit for the primary circulator need to be paralleled from one board to the other. These are on two different 20a circuits.



    Is their a way to have the SR506 board tell the SR504 to turn this pump on and off without do the above? Thanks.

    As I explained above, the "Net" terminals need to be connected.
    Bob Boan


    You can choose to do what you want, but you cannot choose the consequences.
  • STEVEusaPASTEVEusaPA Posts: 3,831Member
    Why all the black wires on neutral, and white on hot?
    Yes bac
    steve
  • IronmanIronman Posts: 5,463Member

    Why all the black wires on neutral, and white on hot?
    Yes bac

    Good eye, Steve.
    Bob Boan


    You can choose to do what you want, but you cannot choose the consequences.
  • pghrichpghrich Posts: 9Member
    Hooked up net 1 and 2. Still not turning on the main pump just the zone pump.
  • kcoppkcopp Posts: 3,415Member
    edited January 13
    I think (I could be wrong) I would get another relay a SR501.
    Wire the end switch from the other relays into the TT on the new Sr 501 relay.
    Wire the primary circ into that single Sr relay.
    When any of the other zones are activated that will turn on that circ pump and thereby start flow and that flow will fire the Tankless WH...
    A Boiler would have had that integrated into it.
  • IronmanIronman Posts: 5,463Member
    edited January 12
    pghrich said:

    Hooked up net 1 and 2. Still not turning on the main pump just the zone pump.

    Did you install the jumper between "ZC &ZR" and change the polarity on the hot and neutral terminals like Steve pointed out?
    Bob Boan


    You can choose to do what you want, but you cannot choose the consequences.
  • kcoppkcopp Posts: 3,415Member
    Did you ever get this working the proper way?
  • pghrichpghrich Posts: 9Member
    Yes, I had to connect the two controllers so that they were on the same circuit instead of two circuits. Once that was complete, we series-ed the main pump between the two controllers allowing for both controllers to call to turn on the primary pump.

    These were connected to the primary pump controller circuit, not the ZC and ZR terminals or the net terminals.

    TACO tech support was a great help and had me up and running within 30 min. Thanks for the follow up.
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