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Thread: Upgrading a Honeywell Thermostat T6169B Line Voltage to Ecobee3 Smart Thermostat

  1. #7

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    You will need a 120vac to 24vac transformer and two relays for each FCU. I am out of town for the holidays. I will try to put together a wiring diagram and upload it by the end of the weekend

  2. #8

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    I have attached a wiring diagram for your system. I am not sure how your OFF HI MED LOW switch is wired in so I have have shown it as it would typically be wired in.

    Name:  Ecobee FCU.jpg
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