Johnson Controls A19AAB-10 Temperature Control

The Johnson Controls A19AAB-10 is a heavy-duty high range oven temperature control designed for demanding commercial and industrial heating applications. Built for precision in high-heat environments, this mechanical temperature control features a setpoint range of 200 to 550 degrees F, making it an essential component for industrial ovens and kilns. The unit utilizes a liquid-filled sensing element with an 8-foot capillary length and a 3/16" x 6" sensing bulb to provide consistent temperature regulation regardless of ambient conditions or barometric pressure changes.

As a remote bulb thermostat, the A19AAB-10 employs a Single-Pole Single-Throw (SPST) switch logic that is Open High, meaning it breaks the circuit upon temperature rise for safety and process control. The 10 degree F fixed differential ensures stable cycling, while the automatic reset functionality allows for seamless operation without manual intervention. This industrial heating control is rated for 24 to 277Vac and includes a convertible range adjuster, allowing field technicians to adapt the interface with a knob or screwdriver slot to suit specific job-site requirements.

Key Benefits for Technicians

• Broad High-Temperature Range: Effectively manages processes between 200°F and 550°F, ideal for industrial finishing and food service equipment.
• Rugged Remote Sensing: The 8-foot capillary provides significant reach, allowing the control box to be mounted away from the heat source.
• Ambient Compensation: The liquid-filled bulb technology ensures the setpoint remains accurate despite fluctuations in room temperature.
• Durable Construction: Features a NEMA 1 compact enclosure for reliable internal component protection in mechanical rooms.
• Simplified Installation: SPST Open High logic is straightforward for high-limit or primary heating control wiring.

Common Questions

How do I adjust the high-limit stop on the A19AAB-10?
To set the cutout stop, loosen the internal stop screw, slide it to the desired maximum temperature on the dial scale, and retighten. This prevents the setpoint from being adjusted beyond a safe limit by end-users.

Can this control be used for cooling applications?
No, the A19AAB-10 is a "Close Low, Open High" device, meaning it breaks the circuit on temperature rise. For cooling or ventilation where you need to start a fan on temperature rise, an "Open Low, Close High" (A19AAB-4 or similar) or an SPDT model is required.

Does the capillary length affect the accuracy?
The 8-foot capillary is factory-calibrated. Accuracy is maintained as long as the capillary is not kinked, dented, or severely deformed, which would change the internal volume and shift the calibration point.

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.