Johnson Controls A19AAC-63 Utility Thermostat

The Johnson Controls A19AAC-63 Utility Thermostat is a high-performance remote bulb temperature control designed for demanding HVACR and industrial applications. This single-stage temperature control features a wide operating range of 100°F to 350°F (38°C to 177°C), making it an ideal choice for high-temperature cutout or operating control in boilers and industrial ovens. Engineered with a durable SPDT switch action (Single-Pole, Double-Throw), the A19AAC-63 allows for versatile configuration in both heating and cooling circuits. The unit is equipped with a 6-foot copper capillary and a Style 1 sensing bulb to ensure precise thermal response across the entire spectrum. For secure field adjustments, it utilizes a screwdriver range adjuster and a fixed differential, preventing unauthorized tampering with setpoints while maintaining consistent calibration. This model is electrically rated for 120, 208, and 240 VAC, providing seamless line voltage thermostat integration for contractors. Please note that the A19AAC-63 is identical to A19AAC-63C, ensuring full compatibility with systems specified for either part number.

Key Benefits

• Broad Temperature Range: Supports extreme applications with a setpoint range of 100°F to 350°F.
• Universal Voltage Compatibility: Multi-tap capability supports 120V, 208V, and 240V systems.
• Flexible Control Options: The SPDT contacts allow for "open on rise" or "close on rise" wiring configurations.
• Rugged Construction: Built with a NEMA 1 steel enclosure and a 6-foot copper capillary for longevity in mechanical rooms.
• Tamper-Resistant Design: The screwdriver slot adjustment ensures that critical temperature settings remain protected.

Common Questions

Can the A19AAC-63 be used for immersion applications?
Yes, but it requires a compatible bulb well or packing nut assembly (sold separately) to protect the sensing element and prevent leaks in pressurized tanks or boilers.

What is the difference between the A19AAC-63 and the A19AAC-63C?
There is no functional or technical difference; the "C" suffix typically denotes a commercial packaging or updated SKU designation, but the specifications are identical.

Does this unit come with an external adjustment knob?
No, this specific model is designed with a concealed screwdriver range adjuster to maintain setpoint integrity in professional environments.

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.