Johnson Controls A19AUC-2 Temperature Control

The Johnson Controls A19AUC-2 is a heavy-duty mechanical temperature control engineered for precision in hazardous location environments. This explosion-proof thermostat (equivalent to the A19AUC-2C) is rated for Class I, Group D (NEMA 7) and Class II, Groups E, F, and G (NEMA 9), making it the standard for safety in grain elevators, chemical plants, and paint spray booths. It operates on a 20 to 80 degree F setpoint range with a tight 3.5 degree F fixed differential, allowing for stable thermal regulation without constant cycling. The SPDT switch action provides versatile control for both heating and cooling equipment across voltages from 24 to 277Vac. Built with a 6 ft capillary and a 3/8" x 4 1/16" sensing bulb, the A19AUC-2 ensures accurate remote sensing in demanding industrial HVACR applications where combustible vapors or dust are present.

• Explosion-Proof Safety: Fully compliant with NEMA 7 and NEMA 9 standards for high-risk thermal monitoring.
• Reliable SPDT Operation: Provides flexible Single Pole Double Throw switching to manage air handlers, compressors, or heaters.
• Durable Sensing Element: Includes a 6 foot capillary length with a copper bulb for responsive heat transfer and remote installation flexibility.
• Automatic Reset: Features a mechanical automatic reset to ensure continuous operation without manual intervention after temperature stabilization.
• Universal Voltage Compatibility: Field-proven to handle inductive and non-inductive loads from 24Vac to 277Vac.

Is the A19AUC-2 compatible with NEMA 7 and 9 enclosures?
Yes, this unit is designed as a standalone hazardous location temperature control that meets Class I and Class II requirements, eliminating the need for additional protective housings in specified environments.

Can I use this for both refrigeration and heating?
Strictly speaking, the SPDT relay allows for one set of contacts to close on temperature rise (cooling) and one to open (heating), making it highly adaptable for various industrial process controls.

What is the difference between A19AUC-2 and A19AUC-2C?
There is no functional difference; these part numbers are identical in technical specifications and footprint.

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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.