House Thermostat Wiring Colors

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Old Lennox Thermostat Wiring Diagram - Wiring Diagram

Can't figure this 3 wire system out or find anything in postal about it Honeywell thermostat function codes Old lennox thermostat wiring diagram

Honeywell Thermostat Function Codes

Can't figure this 3 wire system out or find anything in postal about it

Old Lennox Thermostat Wiring Diagram - Wiring Diagram