| 摘要 |
<p>FAIL-SAFE GAS FEED AND IGNITION SEQUENCE CONTROL APPARATUS AND METHOD FOR A GAS-FIRED APPLIANCE A fail-safe apparatus and method for controlling the sequence of gas feed and ignition, such as by an incandescent igniter, in a gas-fired appliance, such as a thermostatically controlled timer activated clothes dryer. When the appliance is activated by the timer, the control apparatus energizes the igniter and opens a gas valve only after the igniter is energized for a period that is sufficient to heat the igniter to the temperature required to kindle the gas. If the gas is ignited, the control apparatus holds the gas valve open so that the gas continues to burn. If, however, the gas is not ignited, the control apparatus inhibits any further attempt at gas feed and ignition. If a temporary electrical power outage occurs, if the gas supply is interrupted, if the thermostat cycles on and off,or, in the case of a clothes dryer, if a loading/unloading door is opened and then shut again, the control apparatus repeats the gas feed and ignition sequence in an attempt to rekindle the gas.</p> |
