Robertshaw 3520-012 Pressure Operator

The Robertshaw 3520-012 Pressure Operator is a critical pneumatic control component designed for commercial refrigeration systems utilizing R12 refrigerant. Engineered with a 2-inch stroke, this pressure operator provides precise mechanical movement to modulate dampers or valves based on refrigerant head pressure. For contractors servicing legacy HVACR equipment, the 3520-012 offers a reliable solution for maintaining system equilibrium. Its rugged construction ensures durability under constant cycling, making it a preferred choice for direct-acting pressure control applications. This unit effectively converts pressure changes into linear motion, allowing for fine-tuned adjustments in HVAC pneumatic control circuits. When replacing older pressure-actuated operators, verify the bellows integrity and stroke length to ensure seamless integration with existing mechanical linkages. This component is essential for optimizing condenser fan cycling and head pressure control in older industrial cooling configurations.

• Precise 2" Stroke: Delivers accurate mechanical actuation for heavy-duty dampers and valving assemblies.
• R12 Compatibility: Specifically calibrated for high-performance use within legacy R12 refrigerant systems.
• Industrial Build Quality: High-grade materials resist fatigue and pressure fluctuations in demanding environments.
• Seamless Integration: Simplified mounting and linkage connections facilitate faster field replacements and reduced downtime.
• Field-Proven Reliability: Long-standing industry track record for maintaining head pressure stability in commercial applications.

What is the primary function of the 3520-012 in a refrigeration circuit?
It translates refrigerant pressure directly into a 2-inch mechanical stroke to control airflow or fluid bypass, maintaining optimal condensing pressures.

Can this pressure operator be used with modern refrigerants?
While designed for R12, compatibility with retrofit refrigerants depends on pressure-temperature curves and seal compatibility; technical verification of the actuation setpoints is required.

How do I adjust the stroke sensitivity?
Stroke movement is determined by the internal bellows response to pressure; fine-tuning is typically managed through the mechanical linkage and control spring tension.

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.