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WiFi thermostat with Weil Mclain boiler

fabaze12
Member Posts: 25
Good evening guys. I'm trying to install a wi fi thermostat with my Weil Mclain boiler. I searched in the forums here to no vail. Any word on how to add a common wire for this boiler. I dont want a wal wart. Thanks.
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Somewhere on or around your boiler there is a transformer. One terminal on the low voltage side is the common; the other is hot 24 volts. You need to identify which one is the common side and run your third wire from that to your thermostat.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
If you tell us the model of the boiler, we can better lead you in the right direction. If oil fired, 1 zone with a triple aquastat, it will need a separate transformer and an isolation relay. Most gas fired boilers, atmospheric or mod con will have an internal transformer you can use or a zone control board.0
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OK. You don't have a common on the system that can be used. The low volt from the thermostat goes directly to TT on the burner primary. A switching relay like a Taco SR501 will need to be installed by a qualified tech.
On a side note, the boiler is rated at 2.00 GPH but I see on one service card the nozzle is 1.25 GPH. It's possible the pump pressure has been increased to bring it up but I would find out.0
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