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ulall
Community Member
since ‎10-30-2021
‎12-29-2021

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how do i replace a tekmar 256 controller with a NEST - hot water system with weill mcclain boiler

10-30-2021
I have a single zone hot water heating system fired by a weill mcclain gas fired boiler with a pumpThe controller is a Tekmar 256 with outdoor sensor. It seems to have a R T and C wires labelled and the others are just for sensorsThe wiring manual fo...