White-Rodgers 1127-2 Control

The White-Rodgers 1127-2 is a versatile strap-on aquastat designed for professional hydronic applications. This surface mount temperature control features a Single Pole Double Throw (SPDT) switch, allowing for flexible configuration as a high limit, low limit, or circulator pump control. With a wide operating range of 100°F to 240°F and a fixed 10°F differential, it provides precise thermal management for boilers and indirect water heaters. The hydraulic action sensing element ensures rapid response times by maintaining direct contact with the pipe surface. Built for the field, the unit includes a dustproof steel case and specialized screw terminals with “ears” to securely grip both solid and stranded wiring. Its universal mounting capability requires no leveling, simplifying retrofits on vertical or horizontal piping. Rated for 7.4 Amps at 120V and 3.7 Amps at 240V, this 1100 series control is a reliable replacement for the legacy 11B09-2 model in residential and commercial heating systems.

• Versatile SPDT Switching: Supports multiple wiring configurations, including break-on-rise for high limits and make-on-rise for circulator control.
• Simplified Installation: The strap-on design eliminates the need for system draining or well tapping, mounting directly to the exterior of the pipe.
• Robust Connectivity: Terminal “ears” prevent wire slippage, ensuring stable electrical performance under vibration.
• Position Insensitive: The hydraulic action element operates reliably at any angle, providing flexibility in cramped mechanical rooms.
• Wide Compatibility: Standardized temperature range and electrical ratings make it a suitable replacement aquastat for most hydronic heating systems.

Can the White-Rodgers 1127-2 be used on both supply and return lines?
Yes, its SPDT switch action allows it to function as a low limit or circulator control on return lines, or as a safety high limit on the supply side, depending on which terminals (Red/Blue or Red/White) are utilized.

Does this unit require a separate mounting well?
No, this is a surface mount aquastat. It is designed to be secured directly to the pipe surface using the included metal strap, which is ideal for systems where an immersion well is not present.

Is the differential adjustable on this model?
The 1127-2 features a fixed 10°F differential. This prevents short-cycling of equipment while maintaining tight temperature tolerances without the need for manual calibration.

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.