I am installing an IntelliConnect system on my Pentair equipment (Intelliflo VS pump, Intellichlor, and UltraTemp heat pump). The temp, SWG. and pump connections were easy, but I am having trouble finding where to connect the UltraTemp. The instructions say NOT to connect to the RS-485 pins, but instead to connect to the Ext Switch or Firemans Switch. Where the heck is that? I do not see the jumper they mention. I've attached pics of the unit for reference, the high voltage panel below the display/control panel, the and the display/contol panel circuit board. and what's behind the display/control panel board. Any help will be wonderful!