Johnson Controls A19ABB-2 Temperature Control

The Johnson Controls A19ABB-2 is a heavy-duty mechanical temperature control engineered specifically for high-range applications such as crop drying and industrial heating. Built with a single-pole single-throw (SPST) switch that is configured to open on high temperature rise, this controller ensures reliable circuit interruption when setpoints are reached. It operates across a wide voltage range from 24 to 277Vac, making it a versatile choice for various electrical configurations in the field. The automatic reset functionality eliminates the need for manual intervention, streamlining efficiency in demanding environments.

This model features a 50 to 200 degree F setpoint range and a user-adjustable differential of 6 to 24 degrees F, allowing for precise calibration based on specific thermal requirements. The 10-foot capillary length, paired with a 0.290" x 2 1/2" sensing bulb, provides the reach and sensitivity necessary for remote monitoring. For seasoned contractors, the knob range adjuster and visible scale ensure straightforward setpoint management and rapid diagnostics during routine maintenance or installation. Its robust construction and liquid-filled element deliver consistent repeat accuracy regardless of barometric pressure or ambient changes.

• Broad Voltage Compatibility: Supports 24Vac to 277Vac applications, fitting most standard HVACR and agricultural power systems.
• Precision Thermal Control: Features an adjustable differential (6-24?F) to prevent short-cycling and extend the lifespan of heating equipment.
• Built for Tough Environments: Optimized as a high-range crop drying control with a durable NEMA 1 enclosure.
• Easy Installation: Includes a 10? remote capillary and sensing bulb for flexible mounting in various ductwork or tank configurations.
• Reliable Switching: Utilizes SPST open high logic with automatic reset to maintain safe operating temperatures without manual resets.

• What is the primary application for the A19ABB-2? While it serves general industrial heating, its high range and specs are optimized for crop drying temperature control and large-scale ventilation systems.
• Can this be used for cooling applications? No, this specific model is Open High, meaning it breaks the circuit as temperature rises above the setpoint, typically used for heating or high-limit safety.
• Is the sensing element affected by ambient air? No, the liquid-filled sensing bulb and capillary system are designed to maintain repeat accuracy regardless of cross-ambient temperature fluctuations.

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.