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In order to do this you will need to check the schematics of the fan itself. Do you happen to know what fan you have? There are wires that select which speed you are wanting to use/
Unfortunately I don't so I will open this up for you.
I am a different expert. This model is on the evaporator coil. PLease give me the model on the air handler/furnace. I will grab a manual on the unit.You most likely have a variable speed fan so this will be controlled by dip switches in air handler.
If you have a gas furnace model lumber will be inside furnace in burner compartment so I can provide guidance with this specific unit.Model will be on a label just above burners on right or left inside panel
Just got back in town myself.
OK on FAN ON mode at thermostat,your furnace will run fan on LOW HEAT or first stage speed.
To speed fan up you will adjust DIP switches SW7 and SW8 Both will need to be in OFF position
These settings are same for 3 ton and 5 ton