It can control indoor&outdoor fan speed,electric heater,compressor,valve, sweep etc. ... LCD(backlight) or VFD f. It can control indoor&outdoor fan speed,electric heater,compressor,valve, sweep etc. g ... The power line communication is applied between indoor and outdoor controller h. It can run cool,heat,fan,dehumidify ... ,over voltage,over pressure protection etc. Controller for floor-stand type A.C.