Ranco O12-4846 Pressure Control

The Ranco O12-4846 Dual Pressure Control is a versatile, heavy-duty commercial refrigeration pressure switch engineered to provide both high-limit protection and low-side cycling in a single NEMA 1 enclosure. For technicians serviceing legacy and modern systems, this SPST dual pressure control offers a wide low pressure range of 10" WC to 100 PSI with an adjustable 10 to 40 PSI differential, paired with a high-side range of 150 to 450 PSI. The Ranco O12-4846 features a 1/4" SAE male flare connection and is rated for 24 Amps FLA at 120V/240V AC, making it a rugged choice for direct compressor control or pilot duty applications. This HVAC pressure controller is compatible with R12, R22, and R502 refrigerants, ensuring reliable performance across a variety of commercial HVACR systems. The high-pressure side includes a convertible manual or automatic reset, providing flexibility for specific safety protocols and system requirements.

Key Benefits for Contractors

• Dual Function Integration: Consolidates high and low pressure monitoring into one unit, reducing wiring complexity and saving space in the electrical cabinet.
• Broad Compatibility: Supports R12, R22, and R502, making it a reliable Ranco pressure control replacement for older refrigeration racks and AC units.
• Adjustable Low-Side Differential: Fine-tune the 10 to 40 PSI differential to prevent short-cycling and ensure precise compressor operation.
• High Amperage Capacity: The 24A FLA rating allows for direct control of single-phase motors without the immediate need for a secondary contactor in many setups.
• NEMA 1 Reliability: The robust housing protects internal SPST switch components from dust and debris in technical environments.

Common Questions

Is the high-pressure reset automatic or manual on the O12-4846?
This model features a convertible high-pressure reset. It can be set to automatic reset for continuous operation or manual reset to comply with safety standards requiring a technician to inspect the system after a high-head event.

Can I use this with R-410A or R-134a?
While originally specified for R12, R22, and R502, the pressure ranges (up to 450 PSI) allow it to function with several replacements, provided the system pressures align with the Ranco O12-4846 specifications and chemical compatibility is verified for the bellows.

What hookup size does this unit require?
The unit utilizes a standard 1/4" SAE male flare connection, allowing for easy integration with standard capillary tubes or refrigeration hoses.

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.