Boiler Wiring (Weil CGa, Tekmar 256, Taco SR501, and T-Stat)

you only need to remove and cap one of them. The one directly below the low limit dial.

thanks!

Thanks! What a great forum this is! Great members too; no rambling.

New member here, I used this thread to help me set up my Tekmar 256 on my old Burnham single zone, natural gas, hot water boiler. My system is tested and up and running so no quessing here. I got proof! Anyway, the install went pretty much like it is called out in the thread, with a couple of exceptions. The first hurdle was the stat wiring, I ended up just putting a pigtail on the end of each wire from the stat, one side to the Taco and one side to the Tekmar. R and W on the Taco, 7 and 9 on the Tekmar. So the heat call goes out to everyone at the same time. I also had to provide the Tekmar with its own 24v supply. For some reason the Taco did not like sharing the 24v power supply line in Tekmar slot 9 (C-) with the Stat line that needs to reside there too. Upon power up the Taco would shut down, no go. Once I stopped using the Taco as my 24v supply and provided the Tekmar with a stand alone 24v supply everything worked as it should. Circ pump will run on its own when there is a call for heat, the Tekmar decides whether or not to fire the boiler. We well see how it goes. Great thread guys, thanks for all of the info.