1. In heat mode, defrost according to temperature difference of inlet and outlet air.2. Out-door fan controlled by a standalone output to make defrost effect well.3.  3 minutes protecting delay to restart compressor .4.  PG fan motor universal A/C controller.5.  Mode: auto,cool,dry,fan and heat.6.  FAN: high, medium and low.7.  Avoid cold wind in the heat mode.8.  TWO temperature sensors.9.   Wind direction control.10.  Emergent on/off key.11. Timer inline/offline.12. Sleep.13. Suitable for split wall mounted air condition,floor standing      air condition,window mounted air condition.