this dual-run component is a critical upgrade for systems formerly utilizing part numbers 100335-06 or 89M7401

eliminating the need for separate relay models

This kit is a direct replacement for Honeywell 393690-4/U and is engineered for high-performance sealing in residential and commercial gas heating systems

Which boiler models use this specific turbulator

Johnson Controls AFS-405 Switch this dual-run component is aThe Johnson Controls AFS 405 is a professional grade adjustable differential air pressure switch designed for precision monitoring in HVAC, DDC, and energy management systems. Engineered with a glass filled polycarbonate housing and a high performance silicone diaphragm, this sensing switch is optimized for detecting positive, negative, or differential pressure between 0. 05 and 12. 0 inches water column. The inclusion of gold plated contacts ensures