Schneider Electric (Barber Colman) 20-881 Wrench

The Schneider Electric (Barber Colman) 20-881 Wrench is a specialized dual-purpose tool engineered for precision field service on pneumatic control systems. Designed to replace the legacy N2-4 tool, this wrench features a 1/16" hex head and a 1/4" hex head, providing the exact dimensions required for pneumatic thermostat calibration and securing cover screws. This tool is essential for technicians managing Barber Colman 2000 series thermostats and 2341 Series Receiver-Controllers, where precise adjustment of reverse acting and direct acting calibration screws is critical for maintaining accurate branch line pressure. By utilizing the 1/16" end, a technician can rotate calibration screws clockwise to increase branch line pressure or counterclockwise to decrease it, ensuring the system operates within precise setpoint tolerances. Built for durability in high-demand mechanical rooms, the 20-881 ensures compatibility with vintage and modern Schneider Electric HVAC controls, making it a staple for any veteran contractor’s service kit.

Key Benefits:

• Dual-Ended Versatility: Features both 1/16" and 1/4" hex heads to handle calibration and cover screws with a single tool.
• Direct Replacement: Verified 1:1 replacement for the discontinued Barber Colman N2-4 wrench.
• Broad Compatibility: Engineered for use with Schneider Electric (Barber Colman) thermostats and specialized 2341 Series Receiver-Controllers.
• Precision Calibration: Allows for fine-tuned adjustments to pneumatic bimetal elements and summer/winter setpoints.

Common Questions:

Is this wrench compatible with older Barber Colman thermostats?
Yes, the 20-881 is the standard industry tool for legacy Barber Colman pneumatic units, including the common 2000 and 2200 series, specifically for 1/16" calibration needs.

Can I use this for cover removal on other Schneider Electric devices?
While designed for Barber Colman lines, the 1/4" hex end is standard for many HVAC cover screws; however, always verify the specific screw size of your controller before applying torque.

Does this tool assist with branch line pressure adjustments?
Correct. The 1/16" hex head is the primary interface for adjusting the calibration screws that set the 12 psig (or specific application) branch line pressure on pneumatic controllers.

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.