70-51型燃油炉投入运用以来,大部分车辆均采用手动控制。由于手动控制没有自动切断点火电源的保护电路,有时列车员忘记关闭点火开关,致使降压电阻长时间通电,烤燃墙板、配线,运用中多次发生火灾,烧损车辆,对国家财产和人民生命安全威胁很大。因此,我们在原控制箱不变的基础上,将原有自控延时热继电器串入手动点 Since the 70-51 fuel burner is in operation, most of the vehicles are manually controlled. Because manual control does not automatically cut off the ignition power protection circuit, and sometimes the conductor forgot to turn off the ignition switch, resulting in a long time power-down resistor, burning burning wall panels, wiring, the use of multiple fires, burning vehicles, the state property and People’s life and safety is a big threat. Therefore, we in the original control box on the basis of the same, the original automatic delay thermal relay string into the manual point