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A Novice's heat exchanger question

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by woodmizer, Oct 26, 2012.

  1. woodmizer

    woodmizer New Member

    Joined:
    Oct 26, 2012
    Messages:
    1
    When using an OWB with a hot air furnace, once the water to air exchanger is placed in the plenum, hot water will circulate continuously through the exchanger. What keeps the burner from kicking in and burning oil?

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  2. Eric Johnson

    Eric Johnson Mod Emeritus

    Joined:
    Nov 18, 2005
    Messages:
    5,705
    Loc:
    Central NYS
    To be honest, the switch that turns the burner off. I've never taken the time to figure out how to operate my wood side and gas backup simultaneously, mainly because the wood side handles all my winter heating needs. I turn the gas burner off in the fall when I fire up the wood boiler, and turn it back on in the spring when I'm sick of handling wood. That's the best way to be sure....
  3. Armaton

    Armaton Member

    Joined:
    Aug 22, 2011
    Messages:
    116
    Loc:
    Hastings, Michigan
    You could use 2 thermostats, one for the regular HVAC and turn it off, or down, untill needed. And the other just wired to your furnace blower, that way when the house needs heat it just kicks on your blower and away you go. If you leave your regular HVAC t-stat at say 60 degrees, if your wood boiler circuit malfunctioned, then reg system would kick on at 60. A friend of mine does that each winter.
  4. BoilerMan

    BoilerMan Minister of Fire

    Joined:
    Apr 16, 2012
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    1,604
    Loc:
    Northern Maine
    You could use an aquastat on the boiler as well. Wire the gas burner t-stat to the NC contacts. Set it for something like 140F so if there is a fire and the water is over 140F it opens the thermostat wires and does not send the call for heat to the gas burner.

    TS
  5. Clarkbug

    Clarkbug Minister of Fire

    Joined:
    Dec 20, 2010
    Messages:
    1,041
    Loc:
    Upstate NY
    I have to agree with all three replies above... Its really what you are going to be most comfortable with, and how hands-on (or off) you might want your system to be.

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