Johnson Controls A19AAB-26 Utility Thermostat

The Johnson Controls A19AAB-26 Utility Thermostat is a high-range mechanical temperature control engineered for precision in demanding HVACR environments. This remote bulb thermostat features a liquid-filled sensing element that ensures consistent performance across its 100?F to 240?F setpoint range. Built for line-voltage HVAC applications, the SPST switch action is designed to open on temperature rise, making it an ideal choice for high-limit or heating cutout operations. The 6-foot capillary provides flexible bulb placement, allowing for accurate monitoring of air or liquid temperatures in water heaters, industrial ovens, or commercial dishwashers. Its NEMA 1 enclosure protects the internal snap-acting switch from dust and debris while maintaining a compact footprint for streamlined installation. Whether integrated into new builds or used as a universal HVAC replacement part, the A19AAB-26 delivers reliable switching for 120V, 208V, and 240V circuits without the need for external power, ensuring robust operation in critical utility systems.

Key Benefits

• Broad Voltage Compatibility: Rated for 120/208/240 Vac, allowing for seamless integration into various commercial HVACR systems.
• Remote Sensing Precision: The 6-foot capillary and liquid-filled bulb offer accurate feedback unaffected by barometric pressure or cross-ambient conditions.
• High-Temperature Durability: Specifically calibrated for high-range needs (100?F to 240?F), perfect for heating control and process applications.
• Industrial Grade Construction: Features snap-acting SPST contacts housed in a rugged NEMA 1 metal enclosure for long-term field reliability.
• Versatile Mounting: Designed for surface mounting with options for immersion installations using additional tank fittings or bulb wells.

Common Questions

What is the switch action for the A19AAB-26?
This model utilizes a Single-Pole, Single-Throw (SPST) switch that opens the circuit on a temperature rise. It is typically used for heating applications where the system must shut down once the setpoint is reached.

Can this thermostat be used for direct immersion?
While the remote bulb is designed for sensing, direct immersion in pressurized tanks requires a bulb well or a compatible packing nut assembly (such as the FTG13A-600R) to prevent leaks and protect the element.

Does the A19AAB-26 require a specific orientation when mounting?
The controller should be mounted to a flat surface using the provided mounting holes. To maintain calibration accuracy, avoid twisting the case on uneven surfaces; on rough walls, it is recommended to use only the top two mounting holes.

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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.