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.
If your digital thermostat has batteries, connect one wire to R, the
other to W1. If your digital thermostat doesnt have batteries, you'll
need at least 3 wires for it to operate. Take it back and get a
digital with batteries.
Thanks for the assist.
1. Anymore explanation on the jumper or wire....I am quite technically
2. I know no contractor would ask this question...as such it would have
been simple for the mfg. to answer.
3. Thanks for the wiring assist.
I assure you that I am competent, but have never owned a steam boiler...nor
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