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oil fired warm air furnace & oil fired water heater

You could use an ordinary r845 circ relay (or eqiv, almost any relay if you know what to look for)to break TT at the water heater burner using the low voltage contacts (Norm closed) so while the furnace runs the TT on the water heater opens up and does'nt allow it to run, and vise versa for poor mans priority. I am sure the rest of the wiring can be figured out by those in the know..I just figured I would throw the idea out there.


  • Tim_11
    Tim_11 Member Posts: 2
    Control for oil fired furnace & oil fired water heater

    Is there a control available that won't let an oil fired furnace and oil fired water heater fire at the same time? The inspector on the job said the chimney on the jobsite wasn't big enough to handle both units firing at the same time. Thanks
  • J.C.A._3
    J.C.A._3 Member Posts: 2,981
    Yes there is a way......

    This is MOST DEFINATELY to be left to proffesionals!

    If your not, try the "Find A Contractor" link on the top of the pipe on the left. A miswire could be dangerous! Chris
  • john_24
    john_24 Member Posts: 23

    This probably should be left to a professional but if you have a wiring background it can be done with a 6006 aquastat from honeywell.

  • Jack_23
    Jack_23 Member Posts: 153
    How big is the chimney?

    How tall? inside/outside? What are the firing rates of the burners? What is the length/rise of the vent connector for each appliance? Can you reduce the firing rate for either or both appliances and still meet the demand? He may be right...he may be wrong. Has it been fired with both units running to see if it works. Get an ASHRAE (engineered)sizing done on the chimney.
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