Ranco O16-624 Pressure Control

The Ranco O16-624 is a commercially rated low pressure control designed for comprehensive system protection and compressor cycling in HVACR applications. Built with a heavy-duty plated steel frame and a NEMA 1 non-conductive enclosure, this adjustable pressure switch features an operating range of 12 inches Hg to 80 PSI and a tuneable differential between 5 and 38 PSI. This single function control utilizes an automatic reset mechanism and SPDT (Single Pole Double Throw) switching action, opening on pressure fall to prevent evaporator freeze-ups or compressor cavitation. The unit comes standard with the Super Cap capillary protection system, incorporating a 36-inch copper alloy capillary and 1/4 inch SAE flare nut to mitigate vibration-induced stress on brazed joints. It is fully compatible with modern refrigerants such as R-410A, R-134a, and R-404A, making it a versatile drop-in replacement for older R-12 or R-22 systems on walk-in coolers, freezers, and air-cooled condensers.

• Enhanced Durability: Laser-welded bellows and a vibration cone reduce stress at the capillary joint for long-term reliability in high-vibration environments.
• Field Adjustability: Front-located adjustment screws allow for precise calibration of both the cut-in/cut-out points and the differential range.
• Simplified Wiring: Raised screw terminals are fully accessible within the compact housing, streamlining connection tasks for field contractors.
• Broad Compatibility: Rated for a wide voltage range (120V to 600V AC) and suitable for most non-corrosive refrigerants across commercial refrigeration platforms.

What is the purpose of the Super Cap feature?
The Super Cap is a capillary vibration protection system. It uses a low-mass copper alloy tube and a vibration cone to absorb mechanical oscillations, preventing the capillary from fracturing at the brazed connection.

Does this control require a manual reset?
No, the O16-624 is an automatic reset model. Once the pressure rises back above the set differential point, the contacts will close and allow the system to resume operation without manual intervention.

Can this be used as a high-limit safety?
This specific model is designed as a low-pressure control (open on fall). While Ranco offers high-pressure variants, the O16-624 is specifically engineered for suction side monitoring and low-limit protection.

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.