GAS IGNITION CONTROL SYSTEM

摘要

A gas ignition control system of the hot wire type is provided to control a burner having a pilot valve (84) and a main valve (86). A negative temperature coefficient resistorignitor element (67) when reaching the ignition temperature for gas decreases measurably its resistance which decrease controls operation of the pilot valve so that the gas is ignited. A separate flame detector (30) at appearance of the flame via a switching circuit (29) operates a relay (55) having a normally open contact (60) and a normally closed contact (61). The normally open contact (60) switches on the main valve (86) and the normally closed contact (61) switches off the ignition element (67).