I have an older lifebreath HRV. I tried wiring it to my ecobee premium acc terminals. My life breath has 4 wires running to a dehumistat with fan speed control. The wires are only labeled by color. Red, black, yellow, and green. As per instructions I found online I wired red to acc+ and green to acc- and just eliminated the other two wires. I blew a fuse on my HRV 155 max circuit board. Can anyone explain how I can wire this so my HRV will turn my furnace fan on I need the interlock because the HRV uses my air return.
If you can, post a picture of the wiring at the HRV.
Once you add the equipment to the Ecobee it will start the furnace fan anytime the HRV runs, so no interlock wiring is required.
Sorry I can't seem to add a photo. I'll share photos as soon as I figure it out
Try this https://www.dropbox.com/scl/fo/55voufda2078ia3td7pkx/AG1Q-MslbtuaTn1NL0jMDck?rlkey=yekwbh0clpok0xbkoue0l6wzn&st=yaxqmkmd&dl=0
You need to follow the mecanical timer wiring. See the attached picture. Install a jumper between ON and RED. Then wire the Ecobee ACC wires to HI and ON. The HRV will run in high speed when it's turned on. You could also use low speed instead. Just connect the ACC wire to LOW instead of HI. The Ecobee can only control one speed and not both.
For some reason you have to hit user actions and reply at the top to attach a picture as there is no option in the quick reply window.