Programmable Thermostat

This replacement gas valve is engineered for Lennox 73W17 furnace systems and provides dual direct ignition functionality for reliable heating operation. The unit features a 24V solenoid-operated first valve that opens on thermostat call for heat and automatically closes when heating demand ends, combined with a diaphragm-operated second valve that opens under regulator control and closes immediately if gas supply or electrical power is interrupted. This dual safety shutoff design meets modern HVAC safety codes and standards, making it ideal for commercial and residential heating applications requiring enhanced protection against gas leaks. The valve incorporates an integrated manual shutoff control, two automatic operators, and a built-in pressure regulator for optimized system performance and safety. Factory configured for natural gas operation at 3.5 inches water column, the unit connects via 1/2in NPT threading with a 3/4in inlet port for compatibility with standard installation requirements. All adjustments, wiring connections, and pilot outlet access points are conveniently located on top of the unit, simplifying installation and maintenance procedures. The ON-OFF lighting sequence provides clear operational feedback, while the combination gas control design eliminates the need for multiple components, reducing installation complexity and potential failure points. This replacement valve is compatible with Lennox heating systems and equivalent Honeywell models. It is suitable for retrofitting existing furnace installations or new system builds where dual ignition safety features and reliable gas flow control are essential for customer comfort and regulatory compliance.