Ranco O12-1502 Pressure Control

The Ranco O12-1502 is a professional-grade dual pressure control engineered for heavy-duty commercial refrigeration and HVAC applications. This SPST pressure switch consolidates high-side protection and low-side cycling into a single NEMA 1 enclosure, streamlining installation and improving system reliability. The low-pressure side features an adjustable cut-in range of 12" Hg to 50 PSI with a 5 to 35 PSI differential, while the high-pressure side monitors discharge levels from 150 to 450 PSI with a 70 PSI fixed differential. Featuring 36-inch capillary tubes with vibration-resistant flare nuts, the O12-1502 ensures precise refrigerant pressure monitoring for R12, R22, R134A, and R502 systems. The unit includes a convertible reset mechanism, allowing technicians to toggle between manual and automatic reset on the high-pressure side to meet specific safety protocols. Built with laser-welded bellows and a high-impact non-conductive cover, this dual function control is the standard for protecting single-phase compressors or serving as a pilot control for larger contractors.

• Dual-Function Integration: Combines high-limit protection and suction pressure sensing in one compact unit to save space and wiring time.
• Versatile Compatibility: Rated for a wide array of legacy and modern refrigerants including R22 and R134A.
• Field Flexibility: The convertible reset allows for custom tailoring to either manual or automatic safety resets on the high-pressure side.
• Durable Construction: Equipped with the Super Cap capillary protection system and laser-welded bellows to withstand high-vibration environments.
• Easy Calibration: Features large, high-visibility scale plates and accessible adjustment screws for rapid field set-point verification.

Is the Ranco O12-1502 compatible with R-404A or R-410A?
While originally designed for R12, R22, and R502, this control is frequently utilized in systems with compatible pressure envelopes. However, for high-pressure R-410A systems exceeding 450 PSI, a specific high-pressure rated control should be selected.

How do I change the high-pressure reset from automatic to manual?
The convertible reset feature is adjusted via the selector screw located at the top of the control. Turning the screw to the "up" position enables manual reset, forcing a physical intervention after a high-pressure trip, while the "down" position allows the system to restart once pressures drop roughly 70 PSI below the cut-out.

Can this switch directly power a compressor?
This SPST switch is rated to directly handle single-phase compressor motor loads within its electrical specifications (typically up to 24A FLA). For three-phase applications, it must be wired as a pilot control to a contactor coil.

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.