SL1500-SU computer room air conditioner controller is used in heat pump type computer room air conditioner unit. It can control a compressor system. the blower can be controlled by 010V proportional control. the control board has phase sequence fault tolerance. Should maintain normal operation) and rotation function. the control board has a better performance in anti-interference. All ports of the complete controller have passed more stringent EMC tests: electric fast pulse 4kV, surge 4kV, conduction immunity 150K80M, with SL108 handheld programmer, the man-machine interface is more humane.