protecting your internal sensing bulbs from pressure and high-velocity fluid flow in boilers

System Reliability: Restores factory-spec performance to screw type manual operators

the MTZ series with POE oil is required

Optimized Performance: Maintains precise superheat to prevent liquid slugging and maximize heat transfer efficiency

and housing alignment match the original blower assembly perfectly

York S1-1PS3307 Conversion Kit 320788-704 protecting your internal sensing bulbsThe York S1 1PS3307 High Altitude Conversion Kit is a critical component for ensuring proper combustion and operational safety in high elevation installations above 5,000 feet. Specifically engineered for York residential furnaces, including the TM9X single stage series and select 95% AFUE models, this kit includes a high altitude pressure switch factory calibrated to 0. 80 IWG. At elevated altitudes, lower oxygen density can lead to suboptimal air to