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Blue "C" wire is connected to "Y" on old thermostat. New thermostat has separate "C" hookup. Where does the blue wire go - "Y" or "C"? : r/Nest
Model ACC0410, Add-A-Wire Accessory by Manufacturer Venstar, Color White, Allows 5 wire thermostats to use only 4 wires, Pack of 2: Amazon.com: Tools & Home Improvement
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I want to wire a line-voltage thermostat with four wires into a box with two wires which held a dial-type line-voltage
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