Can someone help me understand what is the difference between TriStar VS SP3200VSPND and TriStar VS SP3200VSP. I'm trying to establish which one will work with my Prologic PS4 - my software is revision 4.45. We currently have an old Hayward variable speed pump which just stopped working and needs to be replaced. We have solar roof system, agas heater and a salt chlorinator on the system.
