We'd like to install a timer with freeze protection and have a recommendation for the Intermatic INT PF1103T. Our 7.5 hp pump currently is operated by a Stingl switch. Two concerns. The brochure has the INT PF1103T rated for single phase and 3 hp. Can I use this timer with my pump using one of the 3 phases? (I'm pretty sure that's how the Stingl switch was installed). Can I install it side by side with the Stingl and switch back and forth? We actually don't need the Stingl anymore since we have our full VGB certification. Thanks.