@outbreak, sounds like a fun setup
As @Tomzo mentioned, you'll need a pump start relay for your setup.
Here's a wiring diagram for the Orbit pump start relay
The L1 wires are the power IN wires and L2 are the power OUT wires to the pump. The 24 VAC (blue) wires would go to the enclosure/outlet to power the Iro.
Additionally, you might need to install a 120v outlet to plug the Iro's power adaptor into.
Hope this helps