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stantons
Community Member
since ‎02-01-2022
‎02-02-2022

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Nest 3 connecting to two transformers

02-01-2022
I have a Nest 3, a Carrier central AC system and a Burnham boiler. The AC and the boiler have individual transformers 120v-24v. If I connect heat side only with W, C, Rh, the thermostat works fine, 3.9 or so volts, 200ma, etc. If I connect the air ha...