What does the solenoid coil portion of a combination gas valve control?

The solenoid coil portion of a combination gas valve plays a crucial role in controlling the operation of the gas flow within the system. Specifically, it is responsible for activating a rocker arm mechanism that adjusts the working gas pressure. When electrical current is applied to the solenoid, it creates a magnetic field that moves the rocker arm, thereby opening or closing the gas flow to the burner. This action allows for precise control over the gas pressure delivered to the appliance, ensuring that the equipment operates efficiently and safely.

In contrast, while gas thermostats and pressure gauges are essential components within a gas system, they serve different purposes. A gas thermostat regulates the temperature by turning the gas flow on or off based on the temperature setting, and a pressure gauge provides a visual indication of the pressure but does not actively control the flow or pressure. Therefore, the solenoid coil's function in manipulating the rocker arm directly affects working gas pressure, making it the correct choice in recognizing the solenoid coil's function in a combination gas valve.