The motor on my Hayward Super Pump is on its last legs and needs to be replaced. The current motor is 1 HP with a SF of 1.1. My first inclination was to replace it with an energy efficient single phase motor, so I found a A. O. Smith E-Plus 3/4 HP motor with a 1.5 SF that would have equivalent SFHP (1.125 vs. 1.1). After doing some research on this forum I noticed that dual speed motors are recommended and can result in significant energy savings even over the efficient single speed. I identified a full rated A. O. Smith dual speed 1 HP motor with 1.5 SF, which leads me to some questions. Could increasing my SFHP from the current 1.1 to 1.5 cause problems? I have a fairly large pool, but only 2 intakes and 1 return. I wouldn't want the increased pump power to cause any problems with my filter. Perhaps the fact that I would me primarily running in low speed mode would mitigate any potential problems? The 3/4 HP version of this particular dual speed motor is stated to be 115V instead of the 230V that I require.
Any other potential issues with replacing a single speed motor with dual speed? From other posts it looks like I'll need to add a switch at the motor for low speed mode. I have a standard timer that I don't currently use as I have been running the pump 24/7 for various reasons (algae issues and the current motor locks up when it stops). Hopefully, when these issues are resolved I can start using the timer to use even less energy.