The Johnson Controls T-4000-2139 is a professional-grade horizontal thermostat cover designed specifically for the T-4000 Series pneumatic room thermostats. Engineered for sleek, unobtrusive installation, this beige plastic cover features a clean aluminum faceplate without a thermometer window or setpoint adjustment openings. This configuration is ideal for facilities where unauthorized tampering must be minimized while maintaining a uniform aesthetic across the HVAC zone. The JCI logo is prominently displayed, ensuring brand consistency with existing pneumatic control systems. As a veteran tech knows, the T-4000-2139 cover assembly is more than just a decorative piece; it provides essential physical protection for sensitive bimetal sensing elements and internal calibration points. This unit is strictly for horizontal mount pneumatic thermostats and is compatible with high-volume output models such as the T-4002 and T-4756 series. When replacing a damaged Pneumatic Thermostat Cover, this part ensures the internal components are shielded from dust and mechanical impact, maintaining the long-term accuracy of your proportional control signals. Key Benefits Enhanced Security: The design lacks setpoint windows, preventing unauthorized occupants from adjusting room temperature settings. Durable Construction: High-impact beige plastic matched with a silver-finish aluminum faceplate stands up to commercial terminal equipment environments. Simplified Maintenance: Snaps securely onto the mounting base for quick access during routine calibration and output testing. Professional Aesthetic: Neutral beige finish blends into modern office and healthcare interiors without attracting unnecessary attention. Common Questions Does the T-4000-2139 include a thermometer? No, this specific model is a "no-window" version designed for a clean look without a visible thermometer or setpoint dial. Can I use this for vertical mounting? This cover is specifically oriented for horizontal applications. For vertical installations, a different part number from the T-4000 series is required to ensure the logo and faceplate align correctly. Is the mounting bracket included? This is the replacement cover and faceplate assembly. Standard T-4002-124 mounting brackets are typically already in place on the wall, but should be verified before installation. 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.
