How to update furnace thermostat?
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How to install a smart thermostat on my furnace?
Furnace is a Slant/Fin VSPH-90 boiler. There are three thermostat terminals at the boiler end, but only two have wires connected to them (see photo). The two wires co... See more
http://www.how-to-wire-it.com/wire-a-thermostat.html