Johnson Controls A19BAF-1 Temperature Control

The Johnson Controls A19BAF-1 is a heavy-duty mechanical temperature control engineered for precision in demanding HVACR environments. This SPDT (Single Pole Double Throw) controller features a liquid-filled sensing element with a 1 3/8" x 2 1/4" coiled bulb and capillary, specifically designed for accurate space temperature monitoring. With a setpoint range of 30 to 110?F and a fixed differential of 1.5?F, this unit ensures rapid response to ambient thermal changes without excessive cycling. Built with a NEMA 1 galvanized steel enclosure, the A19BAF-1 provides robust protection for internal components while maintaining automatic reset functionality across line voltages from 24 to 277Vac. The knob range adjuster allows for immediate field calibration, making it a reliable remote bulb thermostat for building heaters, air conditioners, and general-purpose heating or cooling applications where "trip-free" operation is critical for system stability.

• Versatile Compatibility: Supports a wide voltage range from 24Vac to 277Vac, making it suitable for most commercial HVAC systems.
• Precise Thermal Sensing: The coiled bulb design increases surface area for superior sensitivity to air temperature fluctuations.
• Durable Construction: Features a rugged steel housing and dust-protected snap-acting contacts for long-term reliability in mechanical rooms.
• Simplified Installation: SPDT contact action allows for both heating and cooling wiring configurations on a single device.
• Stable Calibration: The 1.5 degree fixed differential prevents short-cycling of compressors or heating elements.

What is the difference between the A19BAF-1 and other A19 series controls?
The A19BAF-1 specifically utilizes a coiled bulb for air temperature sensing in open spaces, whereas other models may use remote bulbs for immersion or surface mounting. It also features a fixed differential for set-and-forget applications.

Can this control be used for both heating and cooling?
Yes. Because it utilizes SPDT switching, you can wire it to open or close on temperature rise, allowing it to control either a heater or an air conditioning unit.

Is the setpoint adjustment accessible to everyone?
This model features a visible knob range adjuster for easy access by technicians; however, the internal differential is factory-set and cannot be adjusted in the field to prevent unauthorized tampering.

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.