Johnson Controls A19ADB-22 Utility Thermostat

As a seasoned HVAC technician, you know that reliability in high-limit safety is non-negotiable. The Johnson Controls A19ADB-22 Utility Thermostat is a professional-grade remote bulb temperature control designed specifically for demanding industrial and commercial applications requiring a dependable manual reset. Featuring a wide 90?F to 325?F temperature range, this SPST (Single Pole, Single Throw) controller is engineered to provide a high-limit cutout, effectively opening on temperature rise to protect your equipment from critical overheating. The unit is equipped with an 8-foot copper capillary, allowing for flexible remote sensing in boilers, water heaters, and general-purpose heating systems. For seamless field integration, the A19ADB-22 includes a knob setpoint adjustment and is electrically rated for 120/208/240 Vac circuits. This model is technically identical to the A19ADB-22C, ensuring full compatibility for replacement and new installations where a NEMA 1 enclosure and trip-free manual reset are required for safety compliance.

• Enhanced Safety Logic: The trip-free manual reset ensures the system remains locked out after an over-temperature event until a technician manually clears the fault.
• Versatile Application: Engineered for high-temperature environments, making it an ideal high limit control for hot water boilers and industrial heaters.
• Durable Sensing Element: The 8-foot liquid-filled capillary and remote bulb provide consistent repeat accuracy unaffected by ambient temperature fluctuations or barometric pressure.
• Universal Voltage Compatibility: Rated for multiple line voltages including 120V, 208V, and 240V, simplifying inventory for multi-site service contracts.
• Easy Installation: Standard NEMA 1 enclosure with a visible scale and knob adjustment allows for rapid setup and clear setpoint verification.

Is the A19ADB-22 a direct replacement for the A19ADB-22C?
Yes, the A19ADB-22 and the A19ADB-22C are functionally and technically identical, sharing the same specifications, sensing elements, and 90/325 degree temperature range.

What is the switch action for this thermostat?
The A19ADB-22 features SPST Open High contact action, meaning the circuit will open and interrupt power to the load when the sensed temperature reaches the high-limit setpoint.

Can this control be used for cooling applications?
No, this specific model is a manual reset limit control that opens on a temperature rise. It is designed as a safety cutout for heating systems rather than a standard cycling thermostat for refrigeration.

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.