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Installing a smart thermostat
Posted on 7/23/23 at 9:59 am
Posted on 7/23/23 at 9:59 am
So I'm trying to replace my nest thermostat with a newer ecobee. First time I tried, stupidly didn't turn off breaker and blew control board fuse. Second time I killer power to ac at breaker, but somehow the wire still made an arc and blew same fuse. Not sure how the wire was able to arc with the AC breaker off. I know I'm stupid. Just wondering if you guys have any ideas/suggestions...
2
Posted on 7/23/23 at 10:05 am to RoosterCogburn585
Which “AC breaker” did you turn off. The AC’s outdoor unit is 220 and will be on a different circuit than the air handler in the attic which is 110. The thermostat is powered by the 110 air handler circuit
Posted on 7/23/23 at 8:09 pm to RoosterCogburn585
Sometimes the power for the control circuit is fed by its own 110V power source
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