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How range works

Gas ranges basically take natural gas or propane and turn it into concentrated heat that you can use for cooking and baking. There are burners on the cooktop and one or two burners in the oven which burn gas that has been ignited by a pilot, spark ignitor, or glow ignitor.

On the cooktop you usually have 4 to 6 burners with grates over them that allow you to cook in pots and pans. Gas flows from the main gas valve to a manifold that has a corresponding number of burner valves. The gas is brought from the burner valve to the burner through a venturi tube. The burner control knobs that you see on the control panel attach directly to the burner valve. This valve controls how much gas is sent to the burner. To get a larger flame, you send more gas to the burner. The venturi tube between the burner valve and the burner allows the gas to properly mix with air for clean combustion. The air and gas mix then flows into the burner where the pilot flame or ignitor ignites it. On models with a spark ignition, there is usually a spark switch attached to the burner valve, a spark module and the spark ignitor. When you turn the valve, the switch tells the spark module to send electricity to the spark ignitor to create the spark to ignite the gas. Almost all older cooktops with unsealed burner units allow you to raise the entire top for cleaning and service.

In order to control how close your food is to the flame, there is at least one adjustable rack in the oven. In the oven, there is at least one burner on the bottom. If there is a broiler below the oven, this is the only burner in the oven. If you have a utility drawer or nothing below the oven, there is probably a second burner on the top of the oven that is used during broiling. The burner is a tubular device through which the gas flows before it’s ignited. It has a lot of little holes on its sides that lets the gas burn and provide heat evenly throughout the oven. The gas gets to the oven burners through a safety valve. The gas safety valve does precisely what the name implies. It prevents gas from being introduced to the burner when there’s a possibility that it won’t get ignited properly. There are a few different variations in their operation, but the purpose is always the same, to prevent accidents, and allow gas to get to the burner when it is safe.

In order for the gas in the oven to burn it needs to be ignited. The most common ignition systems in use currently are the spark ignition and glow-bar ignition systems. Pilot flame systems tend to have hard to find parts.

Many ovens use the glow-bar ignition system to light the oven or broiler. During normal operation, the glow-bar will glow yellow-hot. A weak or faulty ignitor may still glow, but only glows red through orange. Replace a faulty ignitor. Some glow-bar systems have a fuse in the system, under the cooktop or in the console itself. Check for continuity in these systems.

Spark ignition systems use a spark module to generate a high-voltage spark which is used to ignite a pilot light. This module is used for the burners on the stove as well as the burner in the oven. As the pilot light heats a capillary tubes’ bulb liquid, it expands and puts pressure on a diaphragm. The diaphragm then opens the gas safety valve, releasing gas to the burner. This gas then gets ignited by the pilot light flame.

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Pilot ignition systems in the oven use a flame sensor to determine whether or not the pilot is lit. This sensor sits in the middle of the pilot flame. The position of the sensor is very important. The pilot flame has two parts to it, the outer yellow flame, and the inner blue flame. The sensor needs to be in the hottest part of the pilot flame, located right at the tip of the blue flame to operate properly. If the sensor detects that the pilot is lit, only then will it allow the gas safety valve to open and let gas flow to the burner.