The KMC Controls CSC-2003 is a differential-pressure, sub-master pneumatic VAV reset volume controller engineered for precision airflow management in single-duct terminal units. As a veteran-grade direct acting (DA) component designed for normally open (NO) damper configurations, this unit provides critical regulation by responding to a master controller?Çötypically a room thermostat?Çöto reset velocity setpoints. The CSC-2003 functions with an operating main air pressure range of 15 to 30 psig and is finished in a professional beige ABS housing. It is the designated direct replacement for 2326-021 and CSC-2001-22, ensuring seamless field swaps for legacy HVAC systems. This VAV terminal unit controller features independent, blind adjustment knobs for both minimum and maximum airflow limits, allowing technicians to fine-tune differential pressure sensitivity without the need for complex programming. For optimal performance, ensure the unit is calibrated in its final mounting orientation and utilize clean, dry control air to prevent diaphragm contamination. Key Benefits: Universal Compatibility: Serves as the primary replacement for CSC-2001-22 and Siebe 2326-021, reducing truck stock requirements for retrofits. Precise Airflow Control: Features separate adjustable minimum and maximum limits to lock in required CFM parameters. Direct-Acting Precision: Specifically optimized for normally open dampers, providing reliable cooling control with direct-acting thermostats. Rugged Design: Constructed with UL Flame Class 94 HB ABS material to withstand mechanical room environments from 40?? to 120?? F. Common Questions: How do I calibrate the CSC-2003 for accurate CFM? Calibration should be performed using a flow hood or Magnehelic gauge. Always set the "HI" limit first by adjusting the center knob while the thermostat branch pressure is below 3 psig. Can this unit be mounted in any orientation? The CSC-2000 series is position-sensitive. For the CSC-2003, horizontal mounting is preferred, but vertical mounting is acceptable as long as the controller is calibrated in its final installed position. What tubing fits the CSC-2003 ports? Use 1/4" O.D. tubing for main supply (M), actuator (B), and thermostat (T) ports. For the velocity sensor ports (X and Y), 3/8" O.D. tubing is required to minimize pressure drop errors. 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.
