[Excaliber]

Thats pretty much it Z-Link. Myself, I'd wire it so the condensor, evaporator fan AND the compressor run all the time IF the AC is turned on. The Evap fan would run on minimum speed at all times and be subject to increased speed based on a manual switch selection.

I'd wire in the safty switches for high and low pressure to stop the compressor but I'd leave the condensor fan running all the time the AC switch was on.

You will note the "box" does not have that many wires going to it and I suspect this is essentially the primary function it serves. Protection of the compressor more than anything else.

While in theory this is fairly straight forward it will be costly to hire someone to make these mods as it could be very time consuming. Of course, I'd do it myself and it would cost only nickels instead of dollars.

Assuming this system controls temp by utilizing a thermostatic expansion valve there is no need to cycle the compressor or condensor fan. The Evap fan should ALWAYS run at at least minimum speed to lessen the chance of the Evaporator freezing up. If it did freeze up, the low pressure switch would stop the compressor as a safty. The low pressure switch stops the compressor if the system gets to low on "freon" and low pressure results. The high pressure switch would stop the compressor if the condensor fan quit working or for some other reason that resulted in excessive high pressure.