I am looking for a compatible digital thermostat for my system. It is a trol a temp system from 1989. One blue one white one red wire. It is a power on and power off system. I need power to open the damper using red and white while opening it kicks on the furnace. Power then goes from white to blue to close damper while closing the furnace is kicked off. Have thought about using a relay to make this happen but would like a thermostat that could take care of the problem. Wires were labeled 4 5 and 6 honeywell told me they represented r w y but they were wrong.

http://customer.honeywell.com/techlit/pdf/69-0000s/69-0908.pdf

http://customer.honeywell.com/techlit/pdf/69-0000s/69-1361.pdf

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