Haier HGRA201AAWW User Manual - Page 20
Ovens with Pilotless Electric Ignition: Glow Bar Ignition System -7 Models
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ALIGNMENTS AND ADJUSTMENTS, Continued Ovens with Pilotless Electric Ignition: Glow Bar Ignition System (-7 Models) System Operation The glow-bar ignition system consists of three main components: 1. The thermostat (or range control). 2. The glow-bar ignitor. 3. The oven gas valve (also called the safety valve). The thermostat, ignitor and gas valve are wired in series. NORTON GLOWBAR When the thermostat knob is turned to a selected setting, this closes a set of electrical contacts in the thermostat applying power to the series circuit. With power applied, the ignitor begins to heat. The electrical resistance of the ignitor will decrease as the surface temperature of the ignitor increases. THERMOSTAT "ON" TEMPERATURE INCREASES RESISTANCE DECREASES IGNITOR Current flowing in the circuit increases in proportion to the drop in ignitor resistance. The NORTON ignitor limits the operating current flow in the circuit to 3.3 to 3.6 amps. When the current has risen high enough to open the valve, the surface temperature of the ignitor is between 1800 to 2500 degrees F. As gas flows out of the valve and into the burner a portion of the gas flows across the hot ignitor and ignition occurs. OVEN VALVE (OPEN) AMPERAGE THRU VALVE INCREASES AS IGNITOR RESISTANCE DECREASES SERIES IGNITOR/VALVE CIRCUIT GAS FLOW TO OVEN The ignitor will remain energized when the burner is lit. Once the oven reaches the selected temperature, the thermostat contacts will open and remove power from the ignitor/valve circuit. The valve will then close after a few seconds and the burner flame will go out. INLET GAS FLOW ON LEVER Pressure Regulator PRESSURE REGULATOR The pressure regulator, located on the left side of the range, at the inlet of the gas range piping system, serves two functions. 1. Controls the flow of gas to the gas piping system. It maintains a constant pressure of 4" water column on natural gas and for LP gas, if equipped, 10" of water column. 2. Incorporates a "shut-off " valve on some models on the gas supply system. This valve, located on the opposite side of the oven supply tube incorporates a small "lever." When this lever is "up", no gas will flow to the oven. When "down" oven gas is on. If the ignitor glows and the oven won't come on, check this valve. NOTE: Sealed burner models have a "shut-off " located at the safety valve in the rear of the broiler area. Turn the handle on the brass valve fully clockwise to close off gas. 20