The Johnson Controls A19ABC-24 Temperature Control is a field-proven mechanical temperature control designed for heavy-duty commercial and industrial applications. This single-stage unit features a SPDT switching configuration, allowing it to govern heating, cooling, or ventilation equipment with industrial precision. Engineered with a wide setpoint range of -30?F to 100?F, it handles refrigeration and ambient space heating with ease. The adjustable differential, ranging from 3?F to 12?F, gives contractors the flexibility to minimize short-cycling or tighten temperature tolerances depending on the specific load requirements. Built for durability, this remote bulb temperature control utilizes an 8-foot capillary and a 3/8" x 4" sensing bulb, making it ideal for monitoring temperatures in ducts, tanks, or walk-in coolers where the control head must be mounted externally. The A19ABC-24 is highly versatile, operating across a line voltage spectrum of 24 to 277VAC. For service technicians, this model is a direct equivalent or suitable replacement for several legacy units, including the A19ABC-24C, A19ABC-74, and A19ACC-6, provided the temperature range is verified for the specific application. Key Benefits for Technicians: Broad Electrical Compatibility: The multi-voltage capability (24V to 277VAC) allows for a single SKU to be used across various power configurations. Automatic Reset: Eliminates the need for manual intervention after a temporary temperature excursion, ensuring continuous system operation. Field Calibration: Features a convertible range adjuster for precise onsite tuning to match specific system dynamics. Robust Sensing: The 8' capillary length and large sensing bulb provide highly accurate liquid or air temperature readings even in high-vibration environments. Simplified Installation: The SPDT contacts allow for flexible wiring to either break or make a circuit on temperature rise. Common Questions: What is the difference between the A19ABC-24 and the A19ABC-24C? The units are functionally identical in terms of electrical rating and temperature range; however, suffix differences often relate to specific OEM packaging or bundled mounting hardware. This unit serves as a direct technical replacement. Can this control be used for both heating and cooling? Yes, because it utilizes SPDT switching, you can wire to the "Normally Open" (NO) or "Normally Closed" (NC) terminals to control either a cooling system (close on rise) or a heating system (open on rise). Does this unit require an external power source to operate its internal mechanism? No, as a mechanical temperature control, the liquid-filled sensing element provides the physical force required to actuate the switch, making it highly reliable in applications where solid-state electronics might fail. 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.
