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Thank You guys for the responses , Jim I really do appreciate the schematic and yes indeed dieseljeep it's a set of dry contacts only with no internal thermostat , leading me also to believe there likely was a companion thermostat that went with it . It would seem that anyone who did spend the extra money likely would have also gotten the thermostat unit to go with it whether it was a separate purchase or not , why spend the extra money for a feature such as this and not use it . I'll bet the companion thermostat was mounted on the wall in the house the system was originally installed in , only to be thrown away when the programmable "system" was scrapped for an upgraded "all in one" programmable thermostat .
One things for sure , two weeks ago had someone asked "have you ever seen a bedside alarmclock/radio designed to control your furnace ?" I'd have answered "nope , never seen one" ...
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