Ranco O16-585 Pressure Control

The Ranco O16-585 Pressure Control is a field-proven low pressure switch designed for critical suction sensing and safety cutout applications in commercial refrigeration and HVAC systems. As a SPDT manual reset control, it provides dependable protection by requiring a manual intervention once the low-pressure threshold is breached, preventing short-cycling or compressor damage. This unit features a wide pressure range of 10" Hg to 100 PSI with a fixed 10 PSI differential, allowing for precise calibration across various evaporator setups. Engineered for high-demand environments, the electrical ratings reach 17 Amps at 120/240 VAC, making it suitable for direct control of motors, compressors, and solenoid valves, or as a pilot duty component for larger contactors. The 1/4" SAE male flare connection ensures a standard, leak-resistant fit, while the NEMA 1 enclosure protects the heavy-duty snap action switches from debris and environmental wear. This model serves as the direct replacement for P70HA-3 controls, streamlining service truck inventory.

• Direct Replacement Logic: Specifically designed as the primary P70HA-3 replacement to reduce installation time and compatibility guesswork.
• Manual Safety Lockout: The manual reset feature ensures a technician inspects the system for leaks or fan failures before the compressor can restart.
• High Load Capacity: Rated for 17 Full Load Amps, allowing for direct line voltage switching without always requiring an auxiliary relay.
• Application Versatility: Fully compatible with non-corrosive refrigerants including R12, R22, and R502 in suction-side monitoring.
• Rugged Construction: Housed in a durable NEMA 1 metal case with high-visibility scale plates for accurate field adjustments.

Is the Ranco O16-585 compatible with modern HFC refrigerants?
While originally specified for legacy refrigerants, its mechanical bellows and 1/4" male flare connection are compatible with most non-corrosive HFC and HCFC blends used in low-pressure refrigeration applications.

What is the difference between this and an automatic reset control?
The O16-585 is a manual reset pressure switch, meaning the contacts remain open even if pressure returns to normal, necessitating a physical reset by a technician—essential for identifying the root cause of low-pressure trips.

Can this be used for high-side protection?
No, this is specifically a low-pressure suction control. For discharge-side protection, a high-pressure control with a higher PSI range 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.