Johnson Controls A19ABA-4 Utility Thermostat

The Johnson Controls A19ABA-4 Utility Thermostat is a rugged, single-stage remote bulb temperature control engineered for high-accuracy cycling in commercial refrigeration and HVAC systems. Designed with a liquid-filled sensing element, this controller maintains precision "repeat" accuracy regardless of barometric pressure or cross-ambient temperature fluctuations. The A19ABA-4 features a broad 120/208/240 Vac compatibility and SPST (Single Pole Single Throw) contacts, making it a versatile choice for managing frozen food cases, beverage coolers, and general-purpose heating or cooling loads.

This line voltage mechanical thermostat provides an adjustable temperature range of 20?F to 80?F, paired with a concealed differential adjustment of 3.5?F to 14?F to prevent unauthorized tampering. Equipped with a 6-foot capillary length and a 3/8" x 4" sensing bulb, it allows for flexible remote mounting. The automatic reset functionality and screwdriver-slot range adjuster ensure field reliability, while the snap-acting contacts are housed in a dust-protected NEMA 1 enclosure to ensure long-term performance in demanding environments.

• Universal Application: Operates seamlessly across 120V, 208V, and 240V circuits for broad HVACR equipment compatibility.
• Tamper-Resistant Design: The screwdriver range adjuster and internal differential scale discourage unapproved setpoint changes.
• Ambient Compensation: The liquid-filled capillary ensures the temperature control switch remains accurate even when the case is exposed to varying temperatures.
• Flexible Mounting: A 6' capillary length provides ample reach for remote sensing in walk-in coolers or industrial vats.

Is the temperature differential fixed or adjustable?
The Johnson Controls A19ABA-4 features an adjustable differential ranging from 3.5?F to 14?F, allowing technicians to fine-tune cycling to protect compressors or heating elements.

Can this be used for both heating and cooling?
This specific model is typically used for open-high or open-low applications depending on the wiring of its SPST contacts. For complex changeover applications, a SPDT model from the A19 series may be required.

What is the maximum bulb temperature?
While the operating range is 20/80?F, the sensing element is designed to withstand higher temperatures during shipping or short-term ambient spikes, typically up to 140?F.

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.