The Johnson Controls A19BBC-2 is a heavy-duty single-stage mechanical thermostat engineered for precise temperature regulation in demanding HVACR environments. This SPDT (Single-Pole, Double-Throw) control features a wide setpoint range of -30?F to 100?F, making it a versatile solution for both heating and cooling applications, including refrigeration line monitoring and space temperature control. As a direct replacement for A19BBA-1 and A19BAA-1, it allows for seamless retrofitting without extensive field modifications. The unit utilizes a 1 3/8" x 2 1/4" coiled bulb and capillary sensor, ensuring rapid response to thermal shifts. With an adjustable differential of 3?F to 12?F and a multi-voltage rating of 24 to 277 VAC, this control provides the flexibility needed for commercial and industrial electrical loads. The automatic reset functionality and liquid-filled sensing element ensure consistent, high-accuracy performance without the need for external power, reducing potential failure points in the field. Key Benefits for the Contractor Universal Compatibility: Serves as the primary A19 series replacement for obsolete A19BBA-1 and A19BAA-1 models. Field Adjustability: Features a convertible range adjuster and an adjustable differential for fine-tuning system cycling. High-Load Reliability: The SPDT switch supports both heating and cooling circuits across a broad voltage spectrum from 24V to 277V. Durable Sensing: The remote coiled bulb is designed for high-sensitivity space sensing in walk-in coolers, warehouses, and mechanical rooms. No Power Required: Mechanical operation ensures the control remains functional during power fluctuations or control circuit failures. Common Technical Questions What is the difference between the A19BBC-2 and the older A19BBA-1? The A19BBC-2 is the current production replacement. It maintains the same physical footprint and electrical ratings but includes updated internal components for better longevity in high-cycle applications. Can this control be used for both refrigeration and heating? Yes. Because it utilizes an SPDT contact configuration, you can wire to the "Normally Open" (NO) terminals for cooling/refrigeration or the "Normally Closed" (NC) terminals for heating applications. Does this unit require a transformer for operation? No. As a mechanical temperature control, the A19BBC-2 uses a liquid-filled element to mechanically trip the switch. It does not require a dedicated power supply to function. 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.
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