Ranco O16-557 Pressure Control

The Ranco O16-557 Pressure Control is a heavy-duty single low pressure control engineered for precision sensing in commercial refrigeration and HVACR systems. Built with a NEMA 1 enclosure and a robust plated steel frame, this SPDT pressure switch provides flexible control, allowing for "open high" or "open low" operations. It features an adjustable 12" WC to 50 PSI pressure range and a field-tunable 5 to 35 PSI differential, ensuring stable compressor protection or motor control across R12, R22, and R502 applications. The integrated 36-inch capillary tube utilizes the Super Cap protection system and a vibration cone to mitigate stress on joints, while the laser-welded bellows enhance longevity in demanding environments. Designed for direct mounting or pilot duty, the O16-557 offers high-amp rated switching and clear scale plates for rapid field calibration by qualified contractors.

• Application Versatility: Suitable for a wide variety of refrigerants and compatible with compressors, fans, and solenoid valves.
• Enhanced Durability: Laser-welded bellows and a low-mass copper alloy capillary minimize fatigue from system pulsations.
• Contractor-Friendly Design: Features raised screw terminals for easy wiring and a non-conductive cover with a captive screw.
• Adjustable Precision: Both the range and differential are fully adjustable to meet specific system requirements.
• Universal Compatibility: Includes standard 1/4" SAE flare nut connections for seamless replacement of existing controls.

Is the Ranco O16-557 an automatic or manual reset control?
This model is an automatic reset control, meaning it will automatically cycle back once the pressure returns to the specified set point.

What is the purpose of the 36-inch capillary?
The 36" capillary provides the necessary reach for remote pressure sensing, while the Super Cap system protects against work-hardening and kinking.

Can I use this for high-pressure cutout?
No, the O16-557 is specifically designed as a low pressure control. For discharge-side sensing, a high-pressure rated Ranco O-series control should be utilized.

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.