| 摘要 |
The burner utilises a hot surface ignition with an ignitor that is fully sintered and has essentially no porosity. A circuit applies an AC line voltage to the ignitor and to a blower motor. An AC-to-DC converter provides twelve volts DC for operation of a control circuit that has a first time constant circuit for preheating the ignitor and maintaining the ignitor at an ignition temperature for a predetermined ignition trial period of time. A second time constant circuit starts the blower motor and provides fuel to the combustion chamber for a predetermined time concurrent with the ignition trial period. A third time constant circuit either maintains the fan blower in its energised state if a flame of sufficient magnitude and frequency is detected and for de-energising the blower motor if the flame is not detected in less than one second after the ignitor is de-energised. |
