making it suitable for modern high-efficiency hydronic loops

You must always match the L-rating (Open) and the F-rating (Differential) exactly to the manufacturer's plate to ensure the system shuts down before reaching dangerous heat exchanger temperatures

Can this relay be used for interlocking exhaust fans with supply fans

ensuring versatility across various drive configurations

Honeywell S7800A1001 Keyboard Display Module 326070-701 making it suitable for modernThe Honeywell S7800A1001 Keyboard Display Module (KDM) is a critical diagnostic interface designed for use with the Honeywell 7800 Series Relay Modules. Engineered for demanding industrial environments, this Series 5 module features a high visibility 2 row by 20 column Vacuum Fluorescent Display (VFD) that provides real time burner sequence status, including standby, purge, pilot ignition, and run modes. Operating on 13Vdc peak fullwave rectified