Johnson Controls S350PQ-1 Module

The Johnson Controls S350PQ-1 is a high-performance Proportional Plus Integral Temperature Stage Module designed for precise modulating control in commercial HVACR applications. This electronic stage module interfaces seamlessly with the A350 series, utilizing a 5 Vdc reference provided by the A350 and operating on a standard 24 V power supply. Field-proven and versatile, the S350PQ-1 offers both 0 to 10 Vdc and 0 to 20 mA analog outputs, allowing technicians to drive various modulating motors and actuators with high accuracy. For flexible installation, Direct or Reverse Action is jumper selectable, ensuring compatibility with diverse system configurations, whether heating or cooling. Encased in a rugged NEMA 1 enclosure, this module, which is functionally identical to the S350PQ-1C, eliminates offset common in proportional-only systems by employing integral control to maintain the setpoint under varying load conditions. It is an essential component for contractors seeking stable HVAC modulating control and precise analog output signal management.

Key Benefits

• PI Control Logic: Minimizes temperature offset to provide tighter setpoint tracking than standard proportional controllers.
• Dual Output Capability: Supports both voltage and current signals (0-10V / 0-20mA) for broad actuator compatibility.
• Selectable Action: Easily switch between direct and reverse action via internal jumpers to match application requirements.
• System Modular Architecture: Plugs directly into other S350 stage modules and A350 sensors for scalable control configurations.

Common Questions

How does this module handle setpoint deviation?
By utilizing Proportional plus Integral (PI) control, the S350PQ-1 continuously adjusts the output signal based on both the magnitude of the error and the duration of the deviation, effectively eliminating the "droop" or offset associated with proportional-only controls.

Can I use this module with a 4-20 mA actuator?
Yes, while the output is rated for 0-20 mA, it is compatible with most 4-20 mA industrial actuators by calibrating the response range, providing reliable modulating temperature control.

Is there a difference between the S350PQ-1 and the S350PQ-1C?
Technically, these units are identical. The -1C suffix typically denotes a version intended for specific distribution channels or bulk packaging, but the electrical specifications and performance remain the same.

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.