AUTOMATIC IGNITION AND FLAME DETECTION SYSTEM FOR GAS FIRED DEVICES

摘要

AUTOMATIC IGNITION AND FLAME DETECTIONSYSTEM FOR GAS FIRED DEVICESABSTRACT OF THE DISCLOSUREImproved automatic ignition system (10) for gas fireddevices such as boilers, clothes dryers, ranges and the like.The system (10) is of the type including a variable resistanceignition means (16) having a particular temperaturecharacteristic disposed in proximity to the burner (14) forigniting gas flowing therethrough when the ignition means (16) isenergized. The improved system includes detection means (12) forrepeatedly measuring the resistance of the ignition means (16)and for comparing such measurements, and activating means (12)for activating the gas valve opening means (56) to open the valve(60) when the detection means (12) establishes that the ignitionmeans (16) is in the portion of its temperature characteristicwhere the temperature thereof is sufficient to ignite gas. Thepreferred system (10) also includes means (12) for detecting aflameout, means (22) for detecting a low gas pressure condition,and visual means (28) for indicating system status as well as theexistence and nature of system malfunctions.