Where to connect C Wire to1990 Weil Mclain Steam Boiler
Home Improvement Asked by Jeff Lombardi on September 2, 2021
I am attempting to run a new 18/5 line in order to hook up an Ecobee 4 to my Weil Mclain boiler, as my current thermostat only has a R & W wire. I am having trouble figuring out where exactly to hook up the new C wire. Any insight would be helpful.
One Answer
Looks like it should be terminal 2 based on the left hand wiring diagram. Verify it using a multimeter (should have 24v between 1 and 2, and 0 between 2 and chassis ground)
Answered by gbronner on September 2, 2021
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