Johnson Controls T-4000-3141 Plastic Cover

The Johnson Controls T-4000-3141 is a commercial-grade pneumatic thermostat cover designed for horizontal mounting configurations within HVAC control systems. Engineered for T-4000 series thermostats, this white plastic enclosure features a single setpoint window to allow for clear visibility of calibration without compromising the protection of the internal bimetal sensing elements. The unit is designed with a clean, low-profile aesthetic featuring the Johnson Controls logo, and it purposely excludes a thermometer to prevent unauthorized tampering in high-traffic commercial environments. As a critical component for building automation systems (BAS), this replacement cover ensures your pneumatic room thermostat maintains its structural integrity while protecting sensitive air pressure adjustments and proportional output signals. Whether you are performing routine HVAC maintenance or replacing a damaged housing, the T-4000-3141 provides a secure, snap-on fit that is vibration resistant and meets standard commercial specifications for hospital, school, and office terminal equipment.

• Universal T-4000 Compatibility: Designed specifically to fit almost all horizontal T-4000 series pneumatic thermostats (excluding certain T-4100 models).
• Tamper-Resistant Configuration: The no-thermometer design and integrated logo plate provide a professional finish that discourages unauthorized adjustments.
• Precision Setpoint Monitoring: Includes a single setpoint window for immediate visual confirmation of the current thermostat settings.
• Durable Construction: High-impact white plastic resists yellowing and mechanical shock, ensuring longevity in demanding mechanical room environments.
• Simple Field Installation: Facilitates rapid replacement on 1-pipe or 2-pipe pneumatic systems without requiring specialized tools for mounting.

Is the T-4000-3141 compatible with vertical thermostats?
No, this specific model is indexed for horizontal mounting only. For vertical installations, you should source the T-4000-3144 or T-4000-3145 to ensure the window and logo orientation remain correct.

Does this cover include mounting hardware?
The T-4000-3141 is typically a snap-on replacement for existing T-4000 series subplates. While it fits standard Johnson Controls mounting brackets, it is generally supplied as the cover assembly itself.

Will this fit pneumatic thermostats from other manufacturers?
This cover is proprietary to the Johnson Controls T-4000 series. While some pneumatic footprints are similar, the internal clip alignment and setpoint window location are specifically calibrated for JCI bimetal elements.

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.