Johnson Controls T-4000-2138 Plastic Cover

The Johnson Controls T-4000-2138 is a professional-grade beige plastic thermostat cover designed specifically for T-4000 series pneumatic room thermostats. This field-standard component provides a clean, streamlined aesthetic for commercial HVAC systems where tamper resistance and a minimalist profile are required. Engineered for versatility, the T-4000-2138 supports both horizontal and vertical mounting configurations, accommodating various pneumatic control installation requirements. This particular model is a blank thermostat cover, featuring no Johnson Controls logo, no integrated thermometer, and no setpoint windows, making it ideal for facilities where restricted access to thermostat adjustments is prioritized. The durable plastic construction and slotted side vents ensure optimal airflow for accurate bimetal sensing element response. Whether you are performing a pneumatic thermostat replacement or finishing a new HVAC building automation project, this cover provides the rugged protection and professional finish expected from Johnson Controls pneumatic accessories.

• Universal Orientation: Fully compatible with both horizontal and vertical thermostat orientations for maximum field flexibility.
• Tamper-Resistant Design: The blank faceplate without setpoint windows or adjustment access helps maintain system calibration by preventing unauthorized changes.
• Clean Professional Aesthetic: Neutral beige finish and lack of branding ensure the unit blends into diverse commercial environments.
• Optimized Airflow: Engineered with side-vented slots to maintain proper pneumatic sensor sensitivity and response time.
• Direct OEM Fit: Guaranteed compatibility with Johnson Controls T-4000 series pneumatic instruments, ensuring a secure snap-on or screw-on fit.

Is the T-4000-2138 compatible with other thermostat brands?
This cover is specifically engineered for the Johnson Controls T-4000 series. While it may fit some similar pneumatic room thermostats, it is optimized for the dimensions and mounting tabs of the T-4000 line.

Does this cover include mounting hardware?
The T-4000-2138 is typically supplied as the cover assembly. For a full pneumatic thermostat installation, ensure your subplate and mounting screws are intact; otherwise, a conversion kit or mounting bracket may be required separately.

Can I see the temperature through this cover?
No, this is a blank cover design. It does not feature a thermometer window or a setpoint dial opening, which is an intentional design choice for high-traffic areas where restricted access is necessary.

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.