Johnson Controls A19ABA-45 Utility Thermostat

The Johnson Controls A19ABA-45 Utility Thermostat is a rugged, mechanical single-stage temperature control engineered for demanding commercial refrigeration and HVACR environments. This remote bulb thermostat features a 3-foot capillary and a liquid-filled sensing element, ensuring highly accurate thermal response in walk-in coolers, freezers, and greenhouses. Designed with an SPST (Open Low) switch action, the contacts open on a temperature drop, making it an essential component for cooling applications and high-limit protection. The wide -30°F to 100°F temperature range provides the versatility needed for various line-voltage industrial processes without the need for external power. Field adjustments are streamlined via the internal screwdriver range adjuster, and the adjustable differential allows technicians to fine-tune cycling to prevent short-cycling and equipment wear. With automatic reset functionality and a NEMA 1 high-impact plastic enclosure, this Johnson Controls A19 series control delivers field-proven reliability for surface-mount installations in high-moisture or standard utility settings.

• Universal Voltage Compatibility: Rated for 120/208/240 VAC, allowing for seamless integration into diverse electrical systems.
• Precision Sensing: The 3' capillary length and remote bulb allow for sensing in areas where the controller body cannot be mounted.
• Mechanical Reliability: Operates as a non-electronic control, vital for off-grid HVACR systems or mission-critical backup cooling.
• Customizable Control: Features an adjustable differential (6°F to 24°F) to optimize system efficiency and maintain tight setpoints.
• Durable Construction: Built to withstand commercial rigors with a robust automatic reset mechanism and corrosion-resistant components.

What is the difference between Open Low and Open High switching?
The A19ABA-45 uses SPST Open Low logic, meaning the internal contacts break the circuit when the temperature drops to the setpoint. This is the standard configuration for refrigeration temperature controls used to maintain cooling cycles.

Can the A19ABA-45 be used in high-ambient environments?
Yes, the case can handle ambient temperatures up to 140°F, provided the sensed medium remains within the -30/100 degree temperature range for accurate switching.

How do I adjust the setpoint and differential?
The setpoint is managed via the screwdriver range adjuster on the front scale. The differential is adjusted internally to calibrate the "cut-in" and "cut-out" points based on specific compressor or fan requirements.

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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.