Johnson Controls A19ACA-15 Temperature Control

The Johnson Controls A19ACA-15 is a heavy-duty, single-stage mechanical temperature control engineered for high-precision regulation in refrigeration, HVAC, and industrial cooling applications. This SPST (Single-Pole Single-Throw) controller features an open low switch action, effectively breaking the circuit when temperatures drop to the set point, making it an ideal choice for freeze protection or low-limit safety monitoring. Designed for versatile integration, it supports a wide voltage range from 24 to 277 VAC, allowing for seamless installation into various control circuits.

Built with a 10-foot liquid-filled capillary and a 3/8-inch x 4-inch remote sensing bulb, the A19ACA-15 maintains consistent accuracy across its -30 to 100°F setpoint range. The integrated manual reset functionality ensures that any low-temperature excursion requires a technician's inspection before the system resumes operation, providing critical protection for sensitive equipment. The unit includes a screwdriver slot range adjuster for secure field calibration and a NEMA 1 enclosure to protect the internal snap-acting contacts from dust and debris in demanding environments.

• Precision Low-Limit Control: The manual reset temperature switch prevents automatic restarts, ensuring system safety after a cutout event.
• Extended Reach: The 120-inch remote bulb capillary allows for flexible sensor placement in walk-in coolers, beverage dispensers, and air handlers.
• Robust Electrical Rating: Capable of handling inductive loads up to 16 Amps at 120V and 8 Amps at 240V, suitable for direct motor control.
• Cross-Ambient Stability: The liquid-filled sensing element provides reliable repeat accuracy regardless of the ambient temperature surrounding the control case.
• Flexible Mounting: Designed for surface mounting with standard screw terminals for straightforward HVAC/R field wiring.

What is the primary application for an 'open low' manual reset control?
This configuration is typically used as a safety limit to protect coils from freezing or to shut down equipment if the temperature drops below a critical threshold, requiring a manual restart to confirm the issue is resolved.

Can this control be used in wash-down or outdoor environments?
The A19ACA-15 comes standard with a NEMA 1 enclosure, which is intended for indoor use. For moisture-prone or outdoor applications, a secondary weatherproof housing or a NEMA 4X rated model is required.

Is the sensing bulb compatible with liquid immersion?
Yes, the copper bulb can be used for liquid sensing. However, for closed tank applications or high-pressure lines, a 3/8" bulb well (such as the WEL14A-602R) is highly recommended to facilitate bulb removal without draining the system.

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.