| 摘要 |
In a fuel valve and ignitor control system the pull-in current for a fuel valve (16) operating on rectified alternating current is supplied through a normally open contact (r21) of a relay (R2) which is connected in series with a normally open contact (r11) of another relay (R1) and an intermittently operating hot surface ignitor (20). A normally closed contact (r12) of the other relay (R1) is connected in series with the ignitor (20) and the fuel valve (16) through a holding resistor (25), whereby actuation of the other relay (R1) provides unrectified alternating current to the ignitor (20) and actuates the first mentioned relay (R2) to provide pull-in current to the fuel valve (16). Deactivation of the other relay (R1) provides a holding current to the fuel valve (16) via the ignitor (20). <IMAGE> |
