We have an old Weil-Mclain Steam boiler at our business and we want to add a new thermostat and have no idea which of the two wires go to which connection. Weil-Mclain does not assist owners....only contractors....even for a simple question.
Model is L EC-75-PL (or I)
Two wires....red and white....but not sure if these are the actual colors since wire is generally red and white by default.
The new digital thermostat has several different color combinations and I just want to be careful.
TIA, Steve