Johnson Controls S350AB-1 Module

The Johnson Controls S350AB-1 Module is a high-performance temperature stage module designed for precise multi-stage control in commercial HVACR applications. Operating on the Celsius scale, this module serves as an essential add-on to System 350 assemblies, enabling technicians to scale system capacity by adding heating or cooling stages. It features SPDT enclosed relays rated for 10 Amp non-inductive loads at 125 VA pilot duty, providing robust switching for refrigeration compressors, boilers, or cooling tower fans. The unit is identical to the S350AB-1C, offering seamless integration with A350 series controls via a 5-pin plug-together connector, which eliminates the need for complex inter-module wiring.

For fine-tuned system response, the S350AB-1 provides a 0.5 to 17 degree Celsius differential adjustment and a 0.6 to 16.7 Celsius offset range. These field-adjustable potentiometers allow for exact staging setpoints relative to the master control. Housed in a NEMA 1 high-impact thermoplastic enclosure, the module supports both wall and DIN rail mount configurations, ensuring flexibility in tight control panels. Whether you are managing refrigerated food cases or chiller staging, this module delivers the industrial-grade reliability expected by veteran contractors.

• Simplifies Multi-Stage Expansion: Easily adds extra stages to any System 350 setup using the integrated 5-pin connector.
• Versatile Control Logic: Field-selectable jumper allows for immediate switching between heating and cooling modes.
• Precision Staging: Independent offset and differential dials ensure accurate sequencing, preventing short-cycling of expensive equipment.
• Flexible Mounting: Compatible with standard 35 mm DIN rails or surface mounting for rapid installation in any mechanical room.
• Visual Status Monitoring: Front-panel LED provides immediate confirmation of relay energization for simplified troubleshooting.

Is the S350AB-1 interchangeable with the S350AB-1C?
Yes, the S350AB-1 and S350AB-1C are technically identical in performance, specifications, and physical footprint.

Can this module operate independently?
No, the S350AB-1 requires a System 350 master control, such as the A350, to receive power, setpoint, and sensor data.

What is the maximum number of modules I can add?
Up to nine S350A stage modules can be typical in an assembly, depending on the power supply or transformer capacity of your master control unit.

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.