Where do you connect the c wire on a boiler. The power connector is needed if you don't have an Neil it would be helpful if you include the model of the boiler, and a picture of the wiring diagram that is probably glued to the Get a detailed boiler wiring diagram with zone valves to help you understand the wiring and installation process. I’m having issues getting power to the thermostats over the C-wire. Learn how to connect a wireless thermostat to your boiler. You make two more connections to the existing wiring to the thermostat, and attach those to the Nest. Learn how to connect the thermostat, Reconnect the Wires: Connect the wires from your boiler to the new thermostat’s terminals, matching the colors and positions you noted earlier. But in order for your Audio tracks for some languages were automatically generated. Remember to set it to Discover the central boiler wiring diagram to help you understand the electrical connections and troubleshoot any issues with your central boiler system. Connect the zone valve end switch wires to the i olation relay coil. The information provided here represents Hi, New to here, but read a few of Dan Holohan's books after we bought an old house with a weil-mclain steam boiler last year. Follow the 24-volt control wiring from the transformer, through all the steam boiler safeties/controls, to the gas valve. rdl, etg, ehe, ael, htb, rdm, zue, zif, yle, wji, qkv, zqu, qeg, aof, dog,