Johnson Controls A350AB-2 Temperature Control

Maintaining precise thermal regulation in demanding HVACR environments requires the reliability of the Johnson Controls A350AB-2. This electronic System 350 Temperature Control operates on 24Vac and is engineered for high-accuracy on/off control across a broad setpoint range of 90 to 250 degrees F. As an electronic temperature control, it utilizes a SPDT relay output to provide versatile switching for heating, cooling, or ventilating equipment. The field-adjustable 1 to 30 degrees F differential allows technicians to fine-tune cycle rates, preventing short-cycling and optimizing mechanical longevity. Additionally, the 1 to 30 degrees F offset capability ensures seamless integration when stacking multiple A350 series modules for complex stage-control sequences. Built with a rugged NEMA 1 high-impact plastic enclosure, this Johnson Controls thermostat is designed for DIN rail or surface mounting, facilitating rapid installation in mechanical rooms and control panels.

• Modular Scalability: Easily interfaces with S350 stage modules and D350 digital displays to create a complete System 350 HVAC control solution.
• Adjustable Performance: Precision control over differential settings minimizes equipment wear and improves system efficiency.
• Reliable SPDT Output: The Single Pole Double Throw relay offers high-capacity switching suitable for direct load control or pilot duty applications.
• Wide Temperature Range: High-limit or operational control capability reaching up to 250 degrees Fahrenheit caters to diverse industrial and commercial applications.

How do I calibrate the setpoint on the A350AB-2?
Setpoints are adjusted via the internal potentiometer; for high-accuracy applications, it is recommended to use an external D350 digital display module during the commissioning phase to verify real-time sensor data.

What sensors are compatible with this control?
This unit is designed for use with A99 series silicon high-impedance PTC sensors, which provide linear response and are interchangeable without the need for recalibration.

Can I use this for both heating and cooling?
Yes, the SPDT relay provides both Normally Open (NO) and Normally Closed (NC) contacts, making it suitable for either heating or cooling applications depending on your wiring configuration.

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.