Description
The Johnson Controls A19ABB-2 is a heavy-duty mechanical temperature controller engineered for high-range agricultural and industrial applications, including crop drying systems. Featuring a wide 50 to 200°F setpoint range and a broad operating voltage of 24 to 277Vac, this SPST controller delivers reliable, precise temperature management without the need for electronic components — making it exceptionally durable in demanding field environments.
Key Features
- Wide setpoint range: 50°F to 200°F for high-range crop drying and industrial use
- Broad voltage compatibility: 24 to 277Vac for flexible installation
- SPST (Single-Pole, Single-Throw) switching action — Open on temperature rise (Open High)
- Automatic reset for hands-free recovery after setpoint deviation
- Adjustable differential: 6°F to 24°F for fine-tuned control
- 10-foot capillary length for remote sensing flexibility
- Compact sensing bulb: 0.290″ diameter x 2-1/2″ length
- Fully mechanical design — no electronics, no power supply required for sensing
Specifications
- SKU / Part Number: A19ABB-2
- Brand: Johnson Controls
- Control Type: Mechanical Temperature Controller
- Switching Action: SPST, Open on Rise (Open High)
- Reset Type: Automatic
- Voltage Rating: 24 to 277Vac
- Setpoint Range: 50°F to 200°F
- Adjustable Differential: 6°F to 24°F
- Capillary Length: 10 feet
- Sensing Bulb Dimensions: 0.290″ diameter x 2-1/2″ length
- Application: High Range Crop Drying, Agricultural & Industrial Temperature Control
Application
The A19ABB-2 is purpose-built for crop drying operations where high-temperature sensing and reliable switching are critical. The long 10-foot capillary allows the sensing bulb to be positioned precisely within the drying chamber or duct while the controller body remains in a more accessible location. The automatic reset function ensures continuous operation without manual intervention, and the wide adjustable differential helps prevent short-cycling in variable-load environments.
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