Quote:
Originally Posted by mswlogo
Quote from Nest.
“Warning: Some 3rd party C wire adapters can cause problems or damage your Nest thermostat, even if they claim to be Nest compatible. We recommend using a Nest Power Connector to ensure compatibility and best performance with your thermostat.”
Unless the Thermostat has an isolated 24V PAIR of inputs you are asking for trouble. If it depends on a C wire for power you are mixing two 24V systems.
Some thermostats do allow for a simple external power with separate terminals or a jumper. Only use that if the manual clearly states it accepts a separate 24V source. Nest does not.
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Sorry, just figured all Smart ones were about the same. Maybe this is why I didn't look into the Nest when I was looking into them?