McDonnell & Miller 144691 Harness

The McDonnell & Miller 144691, also identified as the UWH-RB-24-L, is a universal wiring harness engineered specifically for the RB-24E-L residential low water cut-off. This replacement harness cable provides the essential interface for connecting the RB-24 LWCO to boilers equipped with burner control panel connections. Designed for rapid integration in 24V burner circuits, the UWH-RB-24-L eliminates the need for complex field wiring, ensuring a secure low water cut-off connection that maintains system safety and boiler control reliability. The 5-foot cable length offers sufficient reach for flexible positioning of the control unit within the boiler jacket or external piping. As a direct OEM replacement part, it ensures proper electrical continuity and signal integrity for the 15,000-ohm probe sensitivity circuit, supporting the high-performance operation required in modern hydronic heating systems.

• Direct Compatibility: Precision-fit for the McDonnell & Miller RB-24E-L electronic low water cut-off.
• Plug-and-Play Installation: Simplifies the integration of the LWCO into existing burner control panels.
• Verified Performance: Maintains the 2.5 VA power consumption and 2A switching capacity of the primary control.
• Industrial Build: Rated for ambient temperatures up to 120°F (49°C) to withstand boiler room conditions.

Is the UWH-RB-24-L compatible with steam boilers?
No, this harness is intended for use with the RB-24 series, which is specifically designed for hot water (hydronic) boilers. It should not be used in steam applications.

Can I use this harness to replace a UWH-RB-24-S or UWH-RB-24-A?
No. The "L" suffix designates a specific connector for burner control panels. The "S" model is for Aquastat transformer plugs, and the "A" model is for systems with vent dampers. Always match the harness suffix to your specific boiler control configuration.

What is the length of the harness cable?
The cable included in the McDonnell & Miller 144691 kit is 5 feet long, providing ample lead for mounting the LWCO control box.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.