I have an older Lennox Healthy Climate HRV-150 WOL ventilation unit that uses a 3-wire wall controller:
Red = +12V
Black = Common
Orange = OBCS
I am trying to install an Ecobee Premium thermostat and would like it to control the HRV with it, but the Ecobee only provides a (ACC+, ACC–).
Is there any way to connect Ecobee directly to this HRV?
Any guidance, wiring diagrams, or confirmed setups would be appreciated.
HRV Wiring Diagram: https://imgshare.cc/uanp4lg2
HRV Wall Controller: https://imgshare.cc/gjwlldu6
Thanks!