Johnson Controls A350AB-1 Temperature Control

The Johnson Controls A350AB-1 is a core component of the System 350 electronic temperature control family, engineered for professional-grade HVACR performance. Operating on 24Vac, this on/off electronic control features a Single-Pole, Double-Throw (SPDT) relay output, making it a versatile choice for both heating and cooling load management. With a wide setpoint temperature range of -30 to 130 degrees F, this unit is built to handle everything from frozen food cases to chiller staging and cooling tower control. The 1 to 30 degrees F adjustable differential allows technicians to fine-tune cycling rates to protect equipment, while the 1 to 30 degrees F adjustable offset ensures precise calibration in complex commercial refrigeration environments. Its modular design supports 35 mm DIN rail mounting and features 5-pin plug-together connectors, significantly reducing wiring time when integrating with S350 stage modules or D350 display modules. An integrated LED relay status indicator provides immediate visual feedback for field troubleshooting.

• Precise Differential Tuning: The 1 to 30?F adjustable differential prevents short-cycling of compressors and boilers, extending mechanical life.
• Highly Compatible: Designed for seamless integration with A99B Series PTC silicon sensors for accurate thermal feedback.
• Standardized Mounting: Supports both surface mounting and DIN rail mounting (35 mm) within a rugged NEMA 1 enclosure.
• Field Versatility: On-board jumpers allow for quick heat/cool mode selection, adapting the SPDT relay to specific site requirements.
• System 350 Scalability: Easily expandable with add-on modules to accommodate multiple stages or remote digital temperature readouts.

• Can the A350AB-1 be used for both commercial heating and cooling? Yes, the SPDT relay and field-selectable jumpers allow the control to operate in either mode, making it suitable for beverage coolers or space heating.
• What power source is required for startup? This model requires a 20 to 30 VAC Class 2 transformer or a specialized Y350R Power Module.
• How do I ensure maximum accuracy for the setpoint? While the dial is factory-calibrated, using a D350 Display Module allows for the most precise monitoring of the sensed temperature.

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.