Schneider Electric (Barber Colman) 21-928-1 Cover

For field technicians and mechanical contractors maintaining legacy pneumatic control systems, the Schneider Electric 21-928-1 Gray Cover is the required updated solution for protecting internal thermostat components. This durable, square-shaped plastic cover is engineered as a direct replacement for the Barber Colman 21-928 series and multiple legacy part numbers, including the CT-921-403 and CT-921-407. Featuring the official Barber Colman logo dial, it maintains the professional appearance of the original installation while securing sensitive bimetal elements and pneumatic relays against dust, moisture, and unauthorized tampering.

Designed for vertical mounting on 2x2 pneumatic thermostats, the 21-928-1 replacement cover provides a tight, secure fit that ensures reliable operation in high-traffic industrial and commercial environments. Whether you are replacing a cracked cover in a Daikin system or retrofitting an older Barber Colman C2-43 unit, this component’s high-impact construction stands up to the rigors of mechanical rooms. Integrating this updated cover into your PM schedule prevents unnecessary service calls caused by exposed controls or setpoint drifting.

• Universal Legacy Compatibility: Streamlines inventory by replacing ten legacy parts, including 21-957, 21-960, 22-828, 22-857, and 22-928.
• Industrial Grade Protection: The rugged gray plastic housing shields internal thermostat parts from environmental debris and mechanical impact.
• Authentic Brand Identity: Includes the standard Barber-Colman logo dial for consistent aesthetic matching across existing control systems.
• Efficient Field Installation: Engineered for quick vertical mounting, allowing for rapid replacement without modifying existing pneumatic connections.

• What models does the 21-928-1 replace? This unit is the primary update for a wide range of legacy covers, specifically the 21-928, 21-957, 21-960, 22-828, 22-857, 22-928, C2-43, and CT-921 series (403, 404, 407).
• Is the dial functional or decorative? The cover features a logo dial that fits standard setpoint interface configurations found on legacy pneumatic control units.
• Is this cover compatible with other brands? While designed for Schneider Electric (Barber Colman) thermostats, it is frequently utilized in compatible McQuay and Daikin pneumatic applications.

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.