1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

Primary Secondary Zoned with Circulators

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by groch, May 2, 2008.

Thread Status:
Not open for further replies.
  1. groch

    groch New Member

    Joined:
    May 1, 2008
    Messages:
    4
    Loc:
    Maine
    I would like to install a TARM SP30 in a primary loop configuration. The current install is HW BB zoned with 4 Circulators, 3 Heat, 1 DHW controlled with an ARGO ARM842. My question is what control is needed to operate the Oil Boiler Circ, when one or more of the zones is active. My first thought was connect the boiler Circ. to the Burner control, but the burner cycles. The TARM boiler Circ operates anytime the its above a threshold temp, 140?

    I have attached my layout for public comment.
    Thanks

    Attached Files:

    Helpful Sponsor Ads!





  2. Nofossil

    Nofossil Moderator Emeritus

    Joined:
    Oct 4, 2007
    Messages:
    3,417
    Loc:
    Addison County, Vermont
    I'll let the primary/secondary circulator zone guys take a crack at this, but I'd expect that each boiler circ would operate based on the associated boiler temp via aquastat or some such.
  3. BrownianHeatingTech

    BrownianHeatingTech Minister of Fire

    Joined:
    Oct 5, 2007
    Messages:
    1,253
    Loc:
    Northwood, NH
    Your current control should have what's called an "end switch." That's what tells the boiler to heat up because there is a zone calling.

    What you essentially need to do is to take that signal and direct it to one boiler (and circulator) or the other. You use an aquastat on the wood boiler to do that. If the wood boiler is warm, then it sends the signal to the wood boiler's circulator. If the wood boiler is too cold, then the signal goes to the oil boiler, just like it currently does.

    Depending on your setup, you may need to add a relay of some sort to isolate the 110V circulator power, if the end switch operation is currently based on 24V.

    Joe
  4. groch

    groch New Member

    Joined:
    May 1, 2008
    Messages:
    4
    Loc:
    Maine
    Thanks. I will investigate the current control system further to see what signals and states are available during the heat cycle.
Thread Status:
Not open for further replies.

Share This Page