Johnson Controls GRD10A-608 Plastic Guard

The Johnson Controls GRD10A-608 is a professional-grade clear plastic thermostat guard engineered to protect critical climate control interfaces from unauthorized adjustment and physical damage. This heavy-duty thermostat lock box is specifically designed for commercial HVAC protection in high-traffic environments like schools, hospitals, and industrial facilities. Constructed from impact-resistant Lexan, the GRD10A-608 ensures clear visibility of setpoints while the double-wall construction and tumbler-type key lock provide a high-security barrier against tampering. The kit includes a baseplate and mounting ring, allowing for horizontal or vertical installation over existing controls without the need for rewiring. This pneumatic thermostat guard is compatible with a wide range of Johnson Controls and Penn units, including the T22, T25, T42, and T4000 series, as well as various humidistats. Its ventilated design maintains 360-degree airflow to ensure accurate sensor readings and optimal HVAC system performance without compromising security.

• Universal Mounting Compatibility: The included mounting ring allows for seamless installation over previously installed thermostats or humidistats on flat surfaces or electrical boxes.
• Enhanced Security: Features a robust tumbler lock mechanism and probe-resistant double-wall design to prevent tampering with sensitive pneumatic controls.
• Impact Resistance: Manufactured from high-durability plastic that withstands mechanical impact in demanding industrial or institutional settings.
• Precision Airflow: Engineered with integrated ventilation slots to allow ambient air to reach sensors, preventing temperature offset or delayed system response.

Can the GRD10A-608 be installed without removing the thermostat?
Yes, the provided mounting ring is designed to slip over existing thermostats, making it an ideal solution for retrofitting security to an active system without downtime.

Which thermostat models are compatible with this guard?
This guard is optimized for Johnson Controls T-series pneumatic thermostats (T22, T25, T26, T4000) and various line-voltage controllers or humidistats of similar dimensions.

Is the cover removable for maintenance?
The unit features a hinged design that allows the cover to swing open fully for easy technician access to setpoints and calibration without removing the entire assembly from the wall.

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.