Hi, I was going over the manual for Honeywell Vision Pro 8000 and noticed it can run on 24V system control power with battery as back up during power failure, if wire is run to connect C terminals between furnace control board and thermostat. I queried about this to Honeywell tech support to confirm it. If you did not know about this, check your manual, other non Vision Pro 8000 series thermostats may be same.
- posted
9 years ago