Johnson Controls A19ABC-12 Temperature Control

The Johnson Controls A19ABC-12 is a professional-grade mechanical temperature control designed for demanding hot water immersion applications. This single-stage thermostat features a SPDT switch (Single-Pole, Double-Throw) that provides versatile control for both heating and cooling circuits. Operating on a 24 to 277Vac range, the unit employs a liquid-filled sensing element that ensures rapid response to temperature fluctuations and high repeatability, which is unaffected by barometric pressure or cross-ambient conditions. It offers a broad 100 to 240 degree F setpoint range with a 6 to 24 degree F adjustable differential, allowing technicians to fine-tune system cycling for maximum efficiency. The A19ABC-12 comes standard with a 1/2" NPT well connector and an 8-foot capillary, making it a rugged boiler operating control and a universal replacement for the A19ABC-12C. Its automatic reset functionality and convertible range adjuster simplify installation in various commercial and residential hydronic systems.

• Universal Compatibility: Serves as a direct high-performance replacement for the A19ABC-12C and similar well immersion controls.
• Precision Control: The adjustable differential (6?F to 24?F) prevents short-cycling, extending the life of pumps and boilers.
• Rapid Response: Utilizes a liquid-filled bulb for immediate temperature detection and reliable SPDT switching.
• Durable Construction: Features a NEMA 1 enclosure and an 8' capillary for flexible mounting and long-term field reliability.
• Flexible Wiring: Supports 24Vac to 277Vac applications, handling a variety of electrical loads in HVACR environments.

Is the A19ABC-12 compatible with the A19ABC-12C?
Yes, the A19ABC-12 is technically identical to the A19ABC-12C and can be used as a direct universal replacement in hot water systems.

Can this control be used for both heating and cooling?
Yes. Thanks to the SPDT switch action, the R-B terminals open high (for heating) and the R-Y terminals open low (for cooling or circulator control).

What is included with the control?
The unit is furnished with a 1/2" NPT well assembly, an 8-foot capillary, and a convertible range adjuster for customized field setup.

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.