Ranco O16-120 Pressure Control

The Ranco O16-120 is a heavy-duty single low pressure control designed for precise regulation in commercial refrigeration and HVAC systems. Built with a SPDT switch (Single Pole Double Throw), this control provides professional-grade flexibility by allowing for either opens on low pressure or opens on high pressure wiring configurations, making it compatible with a wide range of compressors and fan cycles. It features a broad pressure range of 12" WC to 50 PSI and an adjustable differential of 5 to 35 PSI, ensuring specific set-point accuracy for R-22, R-134a, and R-404A systems. The unit utilizes laser-welded bellows and a 1/4" SAE male flare connection for field-proven durability against vibration. Detailed scale plates and local range adjustment screws allow for rapid calibration, while the automatic reset function ensures consistent system uptime without manual intervention in standard operational cycles.

• Universal Compatibility: Engineered for use with a variety of refrigerants, including R-22, R-12, and R-502, providing a reliable solution for older and modern units.
• SPDT Switch Action: Features highly adaptable limit control capabilities for starting/stopping compressors or managing solenoid valves.
• NEMA 1 Enclosure: Includes a non-conductive front cover with a captive screw to protect internal components in mechanical room environments.
• Vibration Protection: High-quality copper alloy capillary design decreases stress at brazed joints, reducing the risk of fatigue failures.
• Precise Calibration: The 7-revolution range adjustment screw allows for high-accuracy pressure sensing and fine-tuned system protection.

What is the primary application for the SPDT switch on this model?
The SPDT switch allows the Ranco O16-120 to act as either an operating control or a high/low limit protector. You can wire it to break the circuit on a pressure drop (common for low-pressure cutouts) or on a pressure rise, depending on the terminal connections used.

Does this unit come with an automatic or manual reset?
The O16-120 is an automatic reset pressure control. It will automatically cycle the connected equipment once the pressure returns to the differential set point, which is standard for most refrigeration cycling applications.

Is the scale plate accurate enough for final calibration?
While the scale plate provides a clear reference for cut-in and cut-out settings, veteran technicians should always verify the final set points using a calibrated gauge set during system startup to ensure absolute precision.

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.