this valve is optimized for R22 systems with a 3

which is standard for many Trane condenser fan assemblies

Common Questions What are the electrical requirements for this element

What is the purpose of the manual lift stem

As a factory-direct component

Williams P323663 Safety Switch 340155-7026 this valve is optimized forThe Williams P323663 Safety Switch is a critical OEM vent limit protection component designed to maintain the operational safety of your gas fired heating equipment. Engineered as a safety limit switch for Williams wall furnaces and vented room heaters, this part features a high precision sensor that triggers at a fixed 200F temperature. When the exhaust gases in the vent reach this thresholdoften due to a blocked flue or inadequate draftthe switch