Ranco O16-166 Pressure Control

The Ranco O16-166 Pressure Control is a heavy-duty SPDT refrigeration pressure switch engineered for high-precision regulation in commercial HVACR systems. Designed to function as either an operating control or a limit protection device, this low pressure control features an adjustable range of 50 to 150 PSI with a configurable differential between 10 and 40 PSI. For technicians working in the field, the O16-166 offers a versatile 36-inch capillary with a 1/4-inch SAE flare nut, streamlining installation in tight mechanical segments. Its robust NEMA 1 enclosure housing a non-conductive cover ensures electrical safety, while the internal snap-acting switch provides reliable, high-amperage performance (rated at 17 Amps @ 120/240V AC) for driving compressors or pilot duty contactors. Compatible with R12, R22, and R502 refrigerants, this unit incorporates laser-welded bellows and a low-mass copper alloy capillary vibration protection system to mitigate stress caused by equipment harmonics, maintaining calibration accuracy in demanding industrial environments.

• Universal Compatibility: Optimized for standard high-side and low-side monitoring across R-12, R-22, and R-502 systems.
• High-Precision Adjustment: Features a 7-revolution range screw for fine-tuning set points and an easy-to-read scale plate.
• Vibration Resistance: The Super Cap capillary protection system uses a vibration cone to protect brazed joints and reduce mechanical stress.
• Flexible Control Options: The SPDT switch configuration allows for simple conversion between low-pressure cut-out and high-pressure cut-in applications.

What is the maximum amperage rating for the Ranco O16-166?
The internal switch is rated for 17 Amps at 120V or 240V AC, making it suitable for direct motor control or pilot duty applications.

Can this pressure control be used for both high and low pressure applications?
Yes, the SPDT (Single Pole Double Throw) switch design allows the O16-166 to be wired to open or close on pressure rise, depending on the system requirements.

How do I adjust the differential on this unit?
The differential is fully adjustable between 10 and 40 PSI using the internal adjustment screw, ensuring the system operates within specific cycling parameters to prevent short-cycling.

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.