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. PG fan motor universal air conditoning controller 

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

7. FAN: high, medium and low 

8. Avoid cold wind in heat mode 

9. Two temperature sensors 

10. Wind direction control 

11. Emergent on/off key 

12. Timer inline/offline 

13. Sleep