? Features Reliable: pure DC 48V power supply, without affecting the AC grid and efficient:? The use of energy-efficient DC inverter compressor, energy efficiency up to 4.5 NR:? Intelligent fan speed can control, reduce the heat load is automatically reduced noise ? corrosion: using a variety of technology tools, outstanding corrosion resistance Maintenance:? Protection class IP55, outdoor side can be directly flushed clean, easy maintenance unit with LCD display Chinese and English menu, simple operation using environmentally friendly refrigerant R134a, in line with RoHS?? Requirements? Caller (delay) from the start, intelligent anti-misuse mode? provides a variety of alarm and RS485 communication function and protection features