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Ecobee3/HRV Installation

NerudaNeruda OttawaMember


I would like to hook up my hrv to my ecobee 3. I've got 3 wires going to the hrv controller, R G B, and the manual lists Y G B, there is an alternate interlocking listed which maybe what's going on. From what I can tell the R wire goes to Acc+ and then I get lost. I think either G or B is capped off but I'm not sure which. All of this wiring has my head spinning.

Venmar Constructo 1.5 HRV
page 12
Ecobee Furnace installation wires
Rc W Y G C



  • kevinmcckevinmcc Macomb, ILMember

    Looking at the install guide, you would connect OL to ACC+ and OC to ACC--.

    Only thing I see that maybe an issue is if the voltage on the HVR is 9.5 volts DC and not 24vac. The Ecobee3 may not detect the HVR.

  • NerudaNeruda OttawaMember

    Thanks but I don't have an OL or an OC, I have an NO, C and NG, they goto from the HRV to the furnace. I have an R G B that go from the HRV to the wall control.

  • kevinmcckevinmcc Macomb, ILMember

    You are using the HVR wall control? If you are using the Lite-Touch, then that should be connected using Y,G,B, not R,G,B.

    But if you want the Ecobee connected, you do not need the wall control.

    You would connect OL to ACC+ and OC to ACC-, or you would connect B to ACC+ and G to ACC-.

    If your furnace is newer, not ancient, you shouldn't need the lockout either.

  • NerudaNeruda OttawaMember

    Ahh. That's making sense. So the extra wire is capped off? It is R G B which is what had me confused. There is no Y. And yes it is the light touch. Furnace is about 10 years old and I didn't need the PEK.

  • kevinmcckevinmcc Macomb, ILMember

    You can cap off any wires you are not using.

    Strange your connections are matching what the install guide shows.

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