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Posted by Dave OH on November 09, 2007 at 10:55:59:
My home monitoring system has several available sensor loops that can be programmed to alarm under either normally open or normally closed conditions.
I wanted to see if I could connect our Ultra boiler to one of these loops, but the factory Weil Mclain alarm module is actually an external relay to power a 120V alarm (siren).
So I'm wondering if there might some sneaky way to connect the sensor loop somewhere else on the Ultra control board. The wiring diagrams all show the terminal strips as being 12V or 120V, rather than an open or closed loop. But there are some multipin connectors, including one for the alarm module, whose details are not shown anywhere.
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