The Johnson Controls A19AAD-12 is a precision-engineered mechanical temperature control designed for demanding HVACR environments. This remote bulb temperature control is specifically built for low-temperature applications, featuring a setpoint range of -30 to 50?F. As a veteran-grade SPDT thermostat, it provides reliable automatic reset functionality for single-stage heating or cooling operations. The A19AAD-12 is technically identical to the A19AAD-12C model, ensuring a seamless drop-in replacement for existing Johnson Controls A19 series installations in walk-in coolers, beverage dispensers, and frozen food cases. For high-accuracy performance, this controller utilizes a liquid-filled sensing element, providing consistent repeat accuracy that remains unaffected by barometric pressure or cross-ambient conditions. The 7-foot copper capillary and 3/8" x 4" bulb offer flexible mounting for remote sensing. A screwdriver slot range adjuster allows for secure setpoint calibration, while the 2.5?F fixed differential is case-compensated to maintain tight temperature regulation across the entire operating range. Key Benefits for HVACR Contractors: Universal Voltage Compatibility: Rated for 24 to 277Vac, simplifying inventory for diverse site requirements. Rugged NEMA 1 Enclosure: Provides a durable, dust-protected housing for standard indoor commercial applications. Precision Switching: Features a heavy-duty SPDT switch for versatile "open high" or "open low" wiring configurations. Case-Compensated Differential: Ensures the 2.5?F fixed differential stays accurate regardless of ambient temperature fluctuations around the control box. Extended Reach: The 7' capillary length allows for strategic bulb placement in deep evaporators or difficult-to-reach sensing zones. Common Questions & Technical Support: Can this replace the A19AAD-12C? Yes, the A19AAD-12 is the direct equivalent and identical in specifications to the 12C variant. What is the maximum bulb temperature? This unit is rated for infrequent exposure up to 140?F, ideal for standard shipping and storage conditions. Does this require a bulb well for liquid immersion? For sensing in tanks or pressurized lines, use the FTG13A-600R packing nut or a compatible bulb well to protect the capillary. 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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