It can control indoor&outdoor fan speed,electric heater,compressor,valve, sweep etc. a. Low cost b. Apply 8 bit ... microcomputer of NEC or Toshiba to main board c. Apply 4 ... . It can control indoor&outdoor fan speed,electric heater,compressor,valve, sweep etc. g. The power line communication is applied ... pressure protection etc. Controller for floor-stand type A.C.