Robertshaw 190-052 Plastic Guard

Protecting critical control setpoints is non-negotiable in high-traffic commercial environments. The Robertshaw 190-052 Plastic Guard is a professional-grade thermostat lock box designed to stop unauthorized tampering and accidental setting changes. As a veteran-preferred HVAC thermostat guard, this kit features a high-impact rectangular clear cover that allows for easy monitoring of current readings while keeping the interface secure. The Robertshaw 190-052 is engineered with ventilation ports on all four sides to ensure maximum airflow, preventing the heat buildup that can lead to inaccurate sensor readings and short-cycling. This locking thermostat cover utilizes a heavy-duty eight-tumbler lock and includes an HVAC guard key for secure access. The BTG-RK series design provides ultimate installation flexibility, allowing contractors to choose between a solid base for new installs or a ring base for retrofit applications—enabling you to secure the thermostat without even removing it from the wall. This is a rugged, tamper-resistant HVAC guard built for the demands of the field.

• Universal Compatibility: Fits most mid-sized rectangular thermostats with internal dimensions of 6-3/8" L x 3-1/2" W x 3" D.
• Airflow Optimized: Integrated circulation ports maintain accurate ambient temperature sensing for the control.
• Flexible Mounting: Includes both solid base and ring base options to streamline installation on existing or new setups.
• Professional Security: Features a robust eight-tumbler lock mechanism with universal keying (Robertshaw 40-857 compatible) for facility-wide management.
• Durable Construction: High-quality, clear plastic housing resists physical impacts and chemical yellowing over time.

Will this guard fit my specific thermostat model?
The Robertshaw 190-052 is a versatile rectangular thermostat protector that accommodates most standard controls; however, always verify your thermostat's height and width against the 6.375" x 3.5" internal clearance before mounting.

Can I install this without disconnecting the thermostat wiring?
Yes. By utilizing the included ring base, you can slip the mounting frame over the existing thermostat and secure it directly to the wall, saving significant labor time in the field.

Can I use one key for multiple guards in the same building?
Absolutely. This kit is designed with standardized keying, allowing technicians to manage multiple HVAC security covers across a facility using a single key.

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.