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I have Carrier HVAC system, model 58CVA/CVX. It has an Infinity thermostat, model SYSTXCCITC01-A.  I want the fan to run continuously while in Auto or Heat or Cool mode. The thermostatfan selection speed does not present the continous run as an option except in Fan only.  Does anyone know how I can get the fan to run 24 hrs a day for better air circulation.  Thanks....

Put it on Fan On.  Your heating and cooling with still work as normal.