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the York S1-7990-3591 is a critical OEM furnace limit switch designed for precision thermal monitoring
leak-proof seal at the blind flange or main valve junction
including the UDX and UDZ models
System Protection: Integrated stainless steel check valve prevents water loss during internal cartridge servicing
This high-limit safety switch is designed for rapid response times and long-cycle reliability in residential and light commercial HVAC applications
Lennox 29M85 Spring Kit the York S1-7990-3591 is aThe Lennox 29M85 (also identified as 29M8501) is a critical Gas Valve LP Spring Kit engineered for high precision fuel regulation in residential and light commercial HVAC systems. This genuine OEM replacement ensures that gas valves, including several White Rodgers and Honeywell models utilized in Lennox equipment, are properly converted and calibrated for liquid propane (LP) operation. In the field, installing this kit is essential for technicians to
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