Johnson Controls A19ADC-31 Utility Thermostat

The Johnson Controls A19ADC-31 is a heavy-duty utility thermostat engineered for high-limit temperature control in HVACR systems demanding a manual reset safety mechanism. This SPDT open high controller operates across a 100?F to 240?F (38?C to 116?C) setpoint range, making it an essential component for monitoring coil discharge or preventing overheat conditions in industrial duct heaters and boilers. The unit features a 6-foot capillary and remote bulb for flexible mounting in areas where the sensing point is distant from the controller. Designed for multi-voltage versatility, the A19ADC-31 thermostat handles 120, 208, and 240 Vac loads with precision. The enclosed setpoint adjustment prevents unauthorized tampering or accidental changes in high-traffic mechanical rooms. This industrial temperature controller ensures the circuit remains open until an operator physically intervenes, providing a critical layer of protection for expensive system components during thermal excursions.

• Universal Voltage Compatibility: Rated for 120/208/240 Vac applications, providing flexibility for diverse job site power requirements.
• Manual Reset Safety: High-limit SPDT action breaks the circuit on temperature rise and requires manual intervention to resume operation.
• Extended Reach: Includes a 6' capillary length for accurate remote sensing in hard-to-reach ductwork or piping.
• Internal Adjustment: The enclosed setpoint design protects the configuration from environment-related shifts and tampering.
• Rugged Enclosure: Built for reliable performance in harsh HVACR service environments where durability is non-negotiable.

Common Questions

How do I reset the A19ADC-31 after an over-temperature event?
This model requires a physical press of the reset button located on the device housing. The circuit will not re-close automatically once the temperature drops below the setpoint, ensuring the technician can inspect the system for the cause of the trip.

Can the A19ADC-31 be used for low-temperature applications?
No, this specific unit is designed for a 100?F to 240?F range with an "Open High" action. It is intended for high-limit cutout rather than freeze protection or low-ambient control.

What is the proper mounting orientation for the remote bulb?
The remote bulb should be positioned in the area of highest air or fluid velocity to ensure accurate thermal transfer. Avoid areas with stagnant air or direct proximity to heating elements that may cause nuisance tripping.

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.