Have a NCM 300 unit, gas heat and electric AC (Bryant). There are 2 zone dampers with 2 White Rodgers thermostats. There are 4 wires in each thermostat, no common wire and I would like to install Nest Learning Generation 3 thermostats.
After doing some surfing on the net, several replies suggested adding Venstar add a wire adapters which will provide the 5th wire to use as the common.
I have two questions: what are your thoughts about using the add a wire adapters? And do I need to purchase 2 adapters and install for each thermostats on the 300 unit?
Thanks and awaiting replies
Post your questions and comments here.
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