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When you say the striped wire is for heat and "goes to the aquahot". I assume you mean it turns on a circulating pump for the aquahot, yes?

Is your bedroom AC limited to 1 compressor if you turn on electric for hot water (as opposed to diesel)?  Mine is. So if I have 2 compressors running, and flip the Electric Aquahot switch, one of my compressors turns off, and the condensor fan switches to low.  BUT I don't know how it does this. I could not make any thermostat wires switch on/off when I flipped the water heater on/off.

Sorry if I'm being dense about this. lol

So the aqua hot wire goes to relays on the aqua hot, the relay does all the work of turning on circulating pumps for that zone. The aqua hot temp is controlled by the thermostat in the aqua hot for either electric or diesel. 

My electric aqua hot switch shuts off the front air completely. I suspect they are doing the same thing as mine except they are just turning off one of the two circuits that supply the air conditioner. You should have 2 AC breakers for each unit, one for each compressor. I beleive mine has a contactor near the electric panel and that contactor  shuts off the AC when you turn on the electric to the aqua hot, has nothing to do with the thermostat wiring, it’s all done with the power wiring.