Weil McLain 591-391-919 Wiring Harness Els PW 17895 Broad Cross-Reference: Directly replaces S1-7956A-3771

Broad Cross-Reference: Directly replaces S1-7956A-3771

allowing it to safely replace 370V capacitors while providing superior protection against voltage surges

streamlining your HVAC repair and maintenance workflows without needing to re-engineer the existing pneumatic tubing layout

ensuring seamless integration and balanced operation within your existing setup

Safe System Isolation: Enables manual gas shutoff

Weil McLain 591-391-919 Wiring Harness Els PW 17895 Broad Cross-Reference: Directly replaces S1-7956A-3771The Weil McLain 591 391 919 Wiring Harness is a critical 9 pin interface engineered specifically for Series 4 CGa gas fired water boilers. As a primary control link, this 9 pin wiring harness establishes secure communication between the control module and essential safety and operational peripherals, including the thermostat, limit switches, pressure switches, and block limit switches. It is explicitly designed for integration with the Honeywell