Description
The Johnson Controls A19ADB-31 is a heavy-duty utility thermostat engineered for demanding commercial and industrial HVAC and process-control applications. Featuring a wide 90°F to 325°F temperature sensing range, this thermostat is well-suited for high-temperature monitoring in boilers, heat exchangers, duct systems, and other process equipment where precise thermal control is critical.
Electrical & Sensing Specifications
- Voltage Rating: 120/208/240 VAC
- Temperature Range: 90°F to 325°F
- Capillary Length: 10 feet for flexible remote sensing installation
- Remote Bulb Dimensions: 0.29″ diameter x 2.5″ length
- Action: Open on temperature rise (Open Hi)
Control & Safety Features
- Manual Reset — requires deliberate operator action to restore operation after a high-temperature trip, providing an added layer of safety
- Enclosed setpoint adjustment for tamper-resistant, secure calibration
- Includes immersion well for easy installation into pipes or vessels without draining the system
Ideal Applications
- High-limit protection on boilers and hydronic heating systems
- Commercial and industrial process temperature control
- HVAC duct and air-handling unit temperature monitoring
- Heat exchanger and fluid system overheat protection
Why Choose the Johnson Controls A19ADB-31?
Built to Johnson Controls’ exacting standards, the A19ADB-31 combines a broad sensing range, robust manual-reset safety action, and a convenient included immersion well into a single, reliable package. The 10-foot capillary gives installers the flexibility to position the control unit away from the sensing point, while the enclosed setpoint adjustment ensures settings remain secure once configured. This thermostat is a trusted solution for professionals who demand dependable high-temperature protection in commercial and industrial environments.
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