I was in the process of looking into a jandy c1900 orp/ph controller. Looking into there controller electrical connections there is a note . It says if unit is to be used with 240vac operation call technical support.I called. The answer i got on the first call was connect hot hot ground. Sure if there was a place . My second call they said they can`t tell me because i was not a pool expert. lol.I`m a electrical engr. for 26 years and i know that there is either part number for 240volts or there are switch settings to select voltage. It does say fuse sizes for each voltage so there must be a way to set it up for 240vac. So why would i purchase something if i can`t get the correct answer.I know there are other products out there but i was wanting to connect it to my aqualink system.This is more for information at this time. Thanks