+19 Weil Mclain Boiler Wiring Diagram References. He (series 3) boiler pdf manual download. Remove 3.95 mm natural gas.
Web please have boiler model number and series from boiler rating label and cp number(s) from boiler. Connect thermostat as shown on wiring diagram. Web as a result of this, you'll need to tie the green wire into the r wire from the transformer and control connector, then.