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For rigid rods
always verify the specific screw size of your controller before applying torque
Always cross-reference the burner orifice stamp with the conversion kit technical data provided in the installation manual to ensure correct gas flow
Compatible with various Johnson Controls and York gas furnaces
Universal Gas Compatibility: Safe for use with all gases
Armstrong Furnace R604221-01 Switch For rigid rodsThe Armstrong Furnace R604221 01 Door Switch is a critical safety interlock component designed for modern HVAC systems. This furnace door safety switch functions as a primary disconnect, ensuring the blower motor and burner assembly cannot operate when the service panel is removed. Engineered to withstand high cycle operations, this interlock switch replacement serves as a direct OEM component for Armstrong, AirEase, and Ducane units. Proper
