The Johnson Controls A350PS-1 (identical to the A350PS-1C) is a robust System 350 electronic temperature control engineered for high-precision proportional plus integral (PI) modulation in HVACR applications. Operating on 24Vac, this module delivers simultaneous 0-10Vdc and 0-20mA analog outputs, allowing for seamless integration with variable speed drives, modulating actuators, and damper motors. The unit covers a setpoint range of -30 to 130°F (-35 to 55°C) and features an adjustable differential (throttling range) of 2 to 30°F (1 to 17°C). Unlike standard on/off controllers, its PI logic eliminates setpoint offset, ensuring the control point stays locked to your parameters regardless of load fluctuations. Each unit is paired with a high-accuracy A99BC-25 silicon sensor for reliable thermal feedback. The NEMA 1 enclosure supports 35mm DIN rail mounting and includes a 10-segment LED bar graph for immediate visual confirmation of output percentage, making it a staple for professional mechanical contractors maintaining critical environmental systems. Key Benefits Precise PI Control: Proportional plus Integral logic maintains stable temperatures without the "droop" or offset common in proportional-only systems. Versatile Output Signals: Dual 0-10Vdc and 0-20mA outputs provide universal compatibility with high-performance HVAC equipment. Modular Flexibility: Part of the System 350 family, allowing for effortless expansion with additional staging or display modules via plug-together connectors. Advanced Calibration: Field-selectable reverse or direct acting modes and adjustable minimum output (0-60%) allow for fine-tuning to specific valve or damper requirements. Common Questions What is the difference between the A350PS-1 and A350PS-1C? These models are functionally identical and share the same technical specifications, wiring diagrams, and application capabilities. Can I use this control for both heating and cooling? Yes. The A350PS-1 includes a jumper-selectable setting for direct acting (cooling) or reverse acting (heating) operation. Does this unit require a specific sensor type? This controller is designed specifically for use with the A99B series (PTC silicon) temperature sensors, such as the included A99BC-25 model. 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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