@napabill, was the support team able to answer your wiring questions? I pulled up your ticket and found this wiring photo:
It reminded me of this other community post from this week -- perhaps it might help you: http://community.rachio.com/t/installation-24v-wires/2417
Do you have an enclosure for your Iro? Or will you be moving it indoors?
Let us know if we can help moving forward.