Johnson Controls A19AGF-31 Temperature Control

The Johnson Controls A19AGF-31 is a precision-engineered mechanical temperature control designed for heavy-duty industrial and commercial HVACR applications. This remote bulb temperature control features a Single Pole Double Throw (SPDT) switch configuration, providing versatility for both heating and cooling circuits across a voltage range of 24 to 277Vac. Built for reliability, it operates with an automatic reset mechanism and maintains a tight 1.5 degree F fixed differential, ensuring consistent thermal regulation without excessive cycling. The unit is equipped with a 5-foot long capillary and a 3/8" x 5" sensing bulb, allowing for accurate remote monitoring. With a 40 to 90 degree F setpoint range and a convenient shaft range adjuster, this open-frame temperature switch is ideal for integration into custom control panels or OEM equipment where a standard enclosure is not required.

• Precise Thermal Regulation: The fixed 1.5°F differential ensures stable environment control for sensitive equipment.
• Versatile Electrical Compatibility: SPDT contacts support dual-purpose functionality for various contractor-grade wiring configurations.
• Durable Sensing Element: The copper remote bulb and 5' capillary allow for flexible placement away from the main control point.
• Simplified Calibration: The integrated shaft adjuster allows for quick onsite setpoint modifications to meet specific system demands.

How do I wire the A19AGF-31 for a cooling application?
To use this for cooling, wire to the Blue (Common) and Yellow (Compressor/Fan) terminals. On a temperature rise, the contacts will close to energize the cooling circuit.

Can this control be mounted in any orientation?
Yes, the mechanical bellows system functions accurately regardless of mounting position, though the capillary should be protected from sharp bends or kinking during installation.

What happens if the sensing bulb loses its charge?
The A19 series utilizes a vapor-pressure element; if the capillary is punctured or the charge is lost, the switch will typically fail in the "open" position for safety.

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.