My current setup includes a Pool Pilot Total Control and an Intellitouch. The way things are wired right now, the intellitouch controls the pump (Intelliflow) and the valves. Independently, the pool pilot controls the chlorine generator and the acid pump. It all works great. However, due to space constraints, the pool pilot manifold sits before the pool/spa diverter valve. When I switch over to the spa function, the pool pilot senses a rise in pH (due to the hotter water?) and wants to start pumping acid. Often, this is unnecessary.
What I'd like to do is shut down the pool pilot when in spa mode. I have an extra relay in the intellitouch but am wondering how to make the best use of it. On the one hand, I could use it to cut power to the pool pilot when the spa is on. Or, I could use it between the pool pilot and the acid pump. With the former, I lose the pool pilot display while the spa is on. Are there other problems? With the later, the pool pilot still thinks it is pumping acid into the pool when it is not. The ideal solution would be one that simply disabled the pool pilot while keeping it powered up. Is there a low voltage contact that I could make or break (using the relay in the intellitouch) that would achive this? Assuming that changing the plumbing is not going to happen, what's the recommended way to achieve this goal?