Johnson Controls A350SS-1 Temperature System

The Johnson Controls A350SS-1 is a high-performance electronic temperature reset system designed for veteran contractors who require precise, reliable thermal management in complex HVACR applications. Operating on a standard 24Vac supply, this System 350 module executes a dynamic reset strategy, automatically adjusting the supply temperature setpoint based on fluctuating master sensor conditions. Whether you are managing chilled water loops or discharge air systems, the A350SS-1 (identical to the A350SS-1C) provides an adjustable reset ratio from 1:5 to 10:1, allowing for granular control over energy efficiency and equipment staging. This comprehensive kit includes both the A99BC-300 sensor and A99BC-25 sensor, housed within a rugged PVC sensor enclosure to withstand demanding mechanical environments. With a wide operating range from -30 to 150°F and a master reset setpoint adjustment from 35 to 90°F, this module ensures your Johnson Controls System 350 setup maintains optimal performance across diverse thermal gradients without the need for manual recalibration.

• Modular Compatibility: Seamlessly integrates with S350 stage modules for scalable on/off or proportional control.
• Dynamic Efficiency: Automated temperature reset control reduces energy waste by aligning supply setpoints with actual ambient loads.
• Field Versatility: Features selectable direct or reverse acting reset modes via internal jumpers to match specific system requirements.
• Complete Setup: Includes dual high-accuracy A99 series sensors and protective PVC housing for immediate field installation.
• Technical Precision: Precise master reset setpoint adjustment (35 to 90°F) provides a stable foundation for complex reset ramps.

Is the A350SS-1 compatible with existing A350SS-1C installations?

Yes, the A350SS-1 and the A350SS-1C are technically identical in performance, specifications, and physical footprint, ensuring a direct drop-in replacement for maintenance or upgrades.

Does this module provide direct relay outputs?

No, the A350SS-1 is an electronic reset module designed to calculate setpoints. It must be paired with S350 stage modules (such as the S350A, S350C, or S350P) to provide physical relay or proportional outputs.

How do I change between direct and reverse acting reset?

Reset action is determined by the positioning of the internal reset ramp jumpers. Horizontal placement configures the unit for direct acting, while vertical placement (factory default) sets it for reverse acting reset.

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.