Poolsean said:
Be careful of the voltage between the filter pump, the digital, and the acid pump. These must all be the same!
Sean, I followed everything you said except this. I don't know of any fundamental reason why the voltages need to match. As long as everything is wired correctly, and properly grounded and bonded, it is possible to use mixed voltages on the equipment pad. If the pump relay is setup the same way that automation systems setup their relays, so that the high voltage contacts on the relay are completely independent of the rest of the system, it ought to be possible to use a mixture of voltages.
Of course, the AutoPilot manuals does not document what the exact specifications of the pump relay are, nor does the manual provide a true circuit diagram. So there is no way to verify that a non-matching voltage is allowed on the AutoPilot pump relay, or what the correct wiring would be in that situation.
Reading through various AutoPilot manuals, there are cautions in a few places that the device connected to the pump relay must match the voltage of the AutoPilot control unit, though I didn't see that in the manual for the Digital unit. Of course, even if we accept that limitation, there is nothing the requires the pump to be at that same voltage, given that the pump is being powered externally, and not through the AutoPilot unit.