Johnson Controls A19BBC-4 Utility Thermostat

The Johnson Controls A19BBC-4 Utility Thermostat is a rugged, SPDT temperature control designed for heavy-duty HVACR applications, including cooling towers, refrigeration units, and unit heaters. Engineered with a stainless steel coiled sensing element, this mechanical thermostat operates without the need for external power, making it a reliable choice for process temperature control in demanding environments. It supports high-capacity electrical loads at 120/208/240 Vac, ensuring compatibility with most commercial line-voltage systems.

For contractors requiring precise field adjustments, the A19BBC-4 features an adjustable differential (typically 1.8?C to 7.2?C) and a convertible setpoint adjustment accessible from the front. This remote bulb thermostat is built for accuracy across a wide range, from -30 to 40 degrees Celsius. Its NEMA 1 enclosure and automatic reset functionality ensure consistent performance and reduced maintenance overhead when managing critical temperature setpoints in industrial settings.

Key Benefits for Professionals

• Versatile Application: The SPDT switching action allows for control of heating, cooling, or ventilation equipment via a single device.
• Corrosion Resistance: The stainless steel sensing bulb is designed to withstand harsh environments better than standard copper elements.
• No Power Required: Mechanical operation allows the A19BBC-4C to function independently of control transformers or external power sources.
• Field Flexibility: Includes an adjustable temperature differential to prevent equipment short-cycling and optimize system efficiency.
• Wide Temperature Range: Effectively covers low-temperature refrigeration and standard ambient heating applications.

Common Questions

Can the A19BBC-4 be used for both heating and cooling?
Yes. Because it utilizes SPDT (Single Pole Double Throw) contacts, you can wire it to break on temperature rise (cooling) or make on temperature rise (heating).

What are the benefits of the coiled sensing element?
The coiled sensing bulb increases the surface area exposed to the air, providing a faster response time to temperature changes compared to standard straight bulbs.

Is this thermostat suitable for walk-in coolers?
Standard HVAC utility thermostats like the A19 series are frequently used in refrigeration for air temperature sensing, provided the range requirement falls within -30?C to 40?C.

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.