The Johnson Controls S350AA-1 is a precision Temperature Stage Module engineered to expand the control capabilities of the System 350 modular architecture. This unit, which is functionally identical to the S350AA-1C, operates on the Fahrenheit scale and features SPDT enclosed relays for reliable switching in commercial HVACR applications. Power is supplied directly via the A350 Control Module, eliminating the need for independent external transformers. Field technicians can configure the 1 to 30 degree differential adjustment and offset range via internal potentiometers to optimize cycle rates and maintain tight setpoint tolerances. Designed for versatility, the enclosure supports either DIN rail mount or direct wall installation, making it a staple for multi-stage heating and cooling sequences. By integrating the S350AA-1 temperature stage into a modular stack, contractors can achieve precise incremental control over compressors, fans, or heating elements with minimal wiring overhead. Key Benefits for Technicians Modular Scalability: Easily interfaces with A350 series controls to add additional stages of temperature control without replacing the primary controller. Configurable Differentials: The adjustable 1?F to 30?F range allows for fine-tuning based on specific mechanical load requirements to prevent short-cycling. Robust Switching: Internal SPDT relays provide high-capacity switching, ensuring compatibility with a wide range of contactors and actuators. Simplified Installation: Supports both standard DIN rail and surface mounting, accommodating various control panel layouts. Common Questions Is the S350AA-1 compatible with Celsius systems? This specific model is calibrated for the Fahrenheit scale. For Celsius-based applications, the S350AB series would be the appropriate selection. How many S350AA-1 modules can be added to a single A350? Depending on the power budget and setup, multiple temperature stage modules can be ganged together to create a multi-stage controller for complex HVACR systems. What is the difference between the S350AA-1 and S350AA-1C? There is no functional difference; the models are identical in technical specifications, electrical ratings, and physical dimensions. 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.
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