Description
The Johnson Controls A19ABC-39 is a heavy-duty utility thermostat engineered for reliable liquid temperature control in commercial and industrial HVAC and hydronic applications. Featuring an immersion bulb sensing element and a protective thermowell included in the box, this thermostat installs directly into a pipe or vessel to accurately monitor and control fluid temperatures without requiring additional accessories.
Voltage & Electrical Compatibility
- Rated for 120, 208, and 240 Vac operation
- Broad voltage compatibility suits a wide range of commercial HVAC and mechanical systems
Temperature Control
- Wide operating range: 30°F to 180°F (−1°C to 82°C)
- Adjustable differential: 6°F to 24°F, allowing precise control of system swing
- Automatic reset returns the thermostat to normal operation once temperature conditions are satisfied
Sensing & Installation
- Immersion bulb design for direct liquid-temperature sensing
- Thermowell included — no separate well purchase required
- Screwdriver-adjustable setpoint for easy field calibration without special tools
Typical Applications
- Hot water heating systems and boiler loops
- Chilled water and cooling systems
- Process fluid temperature control
- Commercial and light industrial HVAC equipment
Why Choose the A19ABC-39?
The A19ABC-39 combines a broad temperature range, multi-voltage flexibility, and a field-ready thermowell into a single, cost-effective package. The screwdriver-adjustable setpoint and automatic reset minimize service time, while the rugged immersion bulb construction ensures long-term accuracy in demanding liquid-temperature environments. Trust Johnson Controls engineering to keep your system running efficiently and reliably.
