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How do I replace a Tekmar TN4 thermostat with Ecobee3
I have a Tekmar 422, 440 and two 355 setup controlling about 10 zones in our house all with communication TN4 thermostats. I'd like to replace one of the TN4 thermostats with an Ecobee3 for a variety of reasons, but I think I was told years ago that only TN4 thermostats will work with this setup for some reason (the right wires exist, with the extra communicating wire I'd just not connect to the Ecobee).
Is there any way basically to replace the some or all of the thermostats in this type of setup and if so do I need any more equipment or potentially to rewire some things.
Thank for any help - happy to provide more information if I've left something out.