Johnson Controls A19AAC-9 Temperature Control

The Johnson Controls A19AAC-9 Temperature Control is a rugged, single-stage electromechanical thermostat designed for high-range HVACR temperature regulation. This remote bulb thermostat features a liquid-filled sensing element and a 6-foot capillary, delivering precise "repeat" accuracy regardless of barometric pressure or cross-ambient fluctuations. Engineered for industrial heating applications and fluid cutout, it operates across a wide setpoint range of 100 to 240 degrees F with a fixed 6-degree F differential. The SPDT switch action (Single-Pole, Double-Throw) allows for versatile wiring as either an open-high or open-low control, making it a reliable choice for commercial water heating and crop drying systems. For field adjustments, the unit includes a visible scale and a screwdriver slot range adjuster. The A19AAC-9 is technically identical to the A19AAC-9C model, ensuring seamless integration into existing Johnson Controls A19 series installations. Utilizing snap-acting, dust-tight contacts, this mechanical temperature controller provides consistent performance in demanding environments from 24 to 277Vac.

• High-Temperature Versatility: The 100 to 240 degree F range is ideal for commercial water heaters, boilers, and industrial process control.
• Durable Sensing Hardware: Features a 3/8" x 3 1/2" copper sensing bulb and a 6' capillary for flexible remote bulb sensor placement in tanks or pipes.
• Calibration Stability: The liquid-filled element ensures the setpoint remains accurate despite changes in surrounding ambient temperatures.
• Universal Compatibility: The SPDT contact configuration supports both heating and cooling logic, simplifying truck stock and field replacements.
• Safety Monitoring: Includes an automatic reset feature to maintain operational continuity once temperatures return to the defined differential range.

What is the difference between A19AAC-9 and A19AAC-9C?
There is no functional difference; the A19AAC-9 and A19AAC-9C are identical units with the same technical specifications and NEMA 1 enclosure compatibility.

Can this control be used for fluid immersion?
Yes, it is specifically designed for fluid cutout applications. For closed tank installations, use a WEL14A-602R bulb well or a compatible packing nut to protect the sensing element.

Is the differential on this model adjustable?
No, the A19AAC-9 features a fixed 6 degree F differential. If your application requires a tighter or wider swing, a different model in the A19 series with adjustable differential should be selected.

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.