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I have a hydronic heating system (Lochnivar)that came controlled with an older (dumb)enter image description here thermostat. I have 5 wires behind the wall and 5 wire in the wire packet going into heating system however only the red and white wires are connected on both sides. The remaining wires (Yellow, Green, Blue) are not connected on either end.

I'm installing a smart thermostat that needs a C-wire, where can I connect that on the circuit board of my system (picture attached)? Any advice appreciated.

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  • Is there an air handler (fan coil) in your system, or do you have radiators/baseboards/underfloor heat only? Sep 13 '20 at 0:41
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    No air handler, no AC, the underfloor heating (hydronic) is all that's here.
    – Matt
    Sep 13 '20 at 0:43
  • What model is your boiler then? Sep 13 '20 at 0:45
  • It appears most similar to this one but I’m not able to locate a model # anywhere lochinvar.com/products/residential-boilers/noble-boiler
    – Matt
    Sep 13 '20 at 1:16
  • Hm. Looking at the install manual for the Noble doesn't give any clues either... Sep 13 '20 at 1:40
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Nowhere in there. that's a DC circuit and a "C" wire is an AC thing.

you'll need to use an auxillary power supply to run your smart thermostat.

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  • Thanks for the answer. I've located a simple auxiliary power supply that plugs into the wall, will post when I confirm the solution
    – Matt
    Sep 13 '20 at 21:58

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