CES is (was) a supplier, recently taken over by a larger company called Aquafinity, but they don't make the VFDs. Their VFDs are Yaskawa and although CES packaged them for their equipment, the drives inside were no different from what Yaskawa sells direct. But that series is no longer supported anyway.
But that Jandy unit only turns the pump on and off, it doesn't have any capability of deciding what speed it should run at, so just having a VFD is not going to accomplish that on its own. That's likely what the CES packaged unit was going to do. So unless you want to engineer that part of this with a PLC or microcontroller of some sort, I suggest you contact Aquafinity and find out what the replacement for that CES unit is now. I'd post a link, but my company security platform is not allowing me to get to their site, so they may have been hacked or something.
