1. chialex

    Navien NCB-240 & common wire

    Hello experts, I have a new Navien NCB-240 water heater and I want to install a new Sensi wifi thermostat. That thermostat requires a common wire that would supply 24VAC. On the Navien I found a terminal marked CN25, it has three connectors and in the wiring diagram this terminal is marked as...
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