1. Auto restart function 

2. In heat mode, defrost according to temperature difference of inlet and outlet air 

3. Out-door fan controlled by a standalone output to make defrost effect well 

4. 3 minutes protecting delay to restart compressor 

5. Mode: auto, cool, dry, fan and heat 

6. FAN: high, medium and low 

7. Avoid cold wind in heat mode 

8. Two temperature sensors 

9. Wind direction control 

10. Emergent on/off key 

11. Timer inline/offline