Johnson Controls A19ABC-11C SPDT Immersion Aquastat 100-240°F with 1/2" Well

The Johnson Controls A19ABC-11C is a single pole double throw (SPDT) immersion-type aquastat designed for precise temperature control in hydronic heating systems, boilers, and water heating applications. This control operates within a temperature range of 100°F to 240°F, making it suitable for a wide variety of commercial and residential heating systems.

Key Features:

• SPDT switching configuration provides versatile control options for heating system automation
• Immersion-type design with included 1/2" well for direct water temperature sensing
• Adjustable temperature range from 100°F to 240°F for flexible system control
• Durable construction designed for long-term reliability in demanding heating applications
• Direct immersion sensing provides accurate temperature response and control

The included 1/2" well allows for easy installation into existing heating systems without the need to purchase additional components. The immersion design ensures accurate temperature sensing by placing the control element directly in contact with the water, providing faster response times and more precise control compared to strap-on or surface-mounted controls.

This aquastat is ideal for applications requiring automated temperature control, such as boiler sequencing, circulator control, high-limit protection, and zone control in hydronic heating systems.