| 摘要 |
A burner control system includes a pump for supplying pressurized fuel through a fuel line and a signal-responsive flow valve to a burner nozzle. Also in the system is an ignition control circuit which includes an igniter operable in response to a first signal in the circuit to ignite the fuel. A flame-detecting cell in the circuit causes the termination of the first signal so as to deactivate the igniter when combustion occurs. A second or auxiliary circuit operatively connected to the ignition control circuit includes a first switch responsive to the first signal in the ignition control circuit to cause a second signal to be transmitted to the flow valve for opening the valve to allow pressurized fuel to flow to the nozzle. A second switch in the second circuit serves as an alternate circuit for transmitting the second signal to the flow valve. The second switch is responsive to the pressure of the fuel in the line so that, in the absence of the first signal, the second signal is transmitted to the flow valve only as long as the fuel pressure is maintained above a predetermined high pressure. |
