Need to return to change filters on System 4,6,7,8 and 9 Systems 6-9 are fully functional. All components are operating within manufacturer specifications. Refrigerant pressures and temperatures are appropriate for indoor and outdoor conditions. Systems 2-14 do not have the ability to operate supplemental heat ( heat strips ). System are wired using 12 awg conductors with a 15 amp breaker in electrical room. Heat strips are not connected and should remain disconnected due to available conductor size.