Schneider Electric (Barber Colman) 2218-134 Thermostat

The Schneider Electric (Barber Colman) 2218-134 is a specialized pneumatic room thermostat designed for proportional control of damper actuators and pneumatic valves in dual-pressure systems. As a veteran-grade summer-winter thermostat, this unit facilitates seamless seasonal changeovers by responding to main air pressure shifts. It is specifically engineered for Honeywell 13 to 18# systems, where the device operates in Reverse Acting (RA) mode at 13 psig and switches to Direct Acting (DA) mode at 18 psig. This snap-acting changeover ensures the environmental control system maintains precise setpoints without the gradual drift common in lower-tier controllers.

Built with a highly sensitive bimetal element and a pilot-operated relay, the 2218-134 offers a standard setpoint range of 55°F to 85°F (13°C to 29°C). The internal pneumatic feedback mechanism provides linear stability throughout the operating range, while the adjustable throttling range of 2 to 12°F allow technicians to fine-tune system response. Standard features include a serrated thumbwheel for adjustments and a leak-proof, self-closing branch gauge tap for easy field diagnostics. This model is supplied without dial limit stops, making it a direct fit for commercial HVACR applications requiring unrestricted field calibration.

• Pneumatic Dual-Pressure Changeover: Automatically switches between 13# RA (Summer) and 18# DA (Winter) based on main air supply.
• High-Stability Control: Utilizes a stainless steel ball-in-seat design to provide consistent pneumatic feedback.
• Universal Compatibility: Drop-in replacement for legacy Barber Colman pneumatic thermostats and compatible Honeywell systems.
• Field Serviceability: Features an O-ring sealed gauge tap and adjustable bimetal for accurate calibration.
• Rugged Construction: Durable bimetal and pilot relay assembly for long-term reliability in industrial environments.

How do I switch this thermostat from summer to winter mode?
The transition is handled remotely by the central pneumatic system. The 2218-134 indexes to Reverse Acting when the main air pressure is at 13 psig and shifts to Direct Acting when the pressure is increased to 18 psig.

Is this unit compatible with Johnson Controls systems?
While the 2218-134 is specifically calibrated for Honeywell 13# and 18# pressure tiers, other models in the 2218 series are designed for Johnson-style 16/25 psig systems. Verify your system's main air operating pressures before installation.

Can the throttling range be adjusted in the field?
Yes, this thermostat features an adjustable throttling range from 2°F to 12°F (1°C to 6.7°C), allowing for precise control logic based on the specific load requirements of the space.

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.