ACMI security system is designed strictly ans carefully to minimize the influence caused by unusual condition. High quality detecting unit and electrical controlling component enhance the credibility of the safety system. Functions: cut off the fuel supply when the fuel pressure is higher or lower than the set limited valve; cut off the fuel supply when the stoppage of the fume exhaust fan,combustion-air fan; malfunctions that result in sound and light alarms are: tileoverlapping, fan malfunction, driven stoppage in any group, flame-out of the burners. Transmission inverter stand-by design, which can be easily to be switched when emergency or malfunction occur.