Rheem Criterion Ii Gas Furnace Wiring Diagram. Web the white wire carries 24vac to the thermostat, which means the black wire is connected to the c terminal. Upflow/ horizontal gas furnaces the rheem® criterion® ii line of. rheem thermostat wiring diagram from wirewiring123.z21.web.core.windows.net Web rheem model rrgg 05n31jkr furnace problem doityourself com community forums. Installed […]