Have a new 230 volt 2 speed pump on a T104 clock with a Len Gordon 3F-95 Air Switch and a 230 volt heater. Need a wiring diagram from the panel to the clock to the switch and to the pump and heater. Pump has Common; Low & Hi connections and Air Switch has Line 1; Line 2; Load 1A High and Load 1B Low. Does air switch have 3 modes (on-Hi-Low) or just two (hi & low) so that when clock turns on it automatically starts in low speed?

What you are looking for does not exist. There is no "diagram" for custom field wiring such as this. Unless of course someone wants to draw it for you, and then it is even hard to say what the layout is.

Is this your house, or is this for a customer?
From the sound of it and the way it is asked I'd say you would be well served hiring an electrician to do this job.
A tub is no place you want to mess around doing the electric wrong. Trial and error is NOT applicable here!

What is going to control the Heater?

The Flow switch.