Ranco A30-308 Refrigeration Control

The Ranco A30-308 is a heavy-duty, constant differential refrigeration control engineered for precise temperature management in commercial freezers, ice machines, and beverage coolers. As a veteran HVAC technician, you know the value of a high-amperage SPST switch that can handle demanding locked rotor amps up to 80A at 240V. This mechanical cold control features a laser-welded stainless steel bellows for long-term durability and a vapor-filled capillary extending 84 inches, providing the reach needed for complex evaporator coil placements or remote sensing in reach-in units.

Operating with a fixed 11°F differential, the A30-308 is calibrated for a normal off temperature of -12°F and a normal on of -1°F. It is classified as a "no off" control, meaning it does not feature a manual positive off position on the adjustment dial. The included break-off shaft and universal mounting brackets make this a versatile OEM replacement part for brands like Manitowoc, Hoshizaki, and Silver King. When your freezer thermostat fails, this Robertshaw-built component ensures the compressor cycles accurately to maintain critical food safety temperatures.

Key Benefits for the Contractor:

• Universal Compatibility: Includes break-off shafts and multi-fit brackets to replace a wide range of A30 series controls on the job site.
• High Amperage Capacity: Rated for 20 Amps at 120/240V, making it suitable for larger commercial refrigeration compressors without external contactors.
• Extended Reach: The 84-inch capillary tube allows for flexible routing and precise sensing in ice machine bins and deep-well coolers.
• Durable Sensing: Laser-welded bellows prevent gas charge leakage, ensuring the temperature control maintains its 11-degree differential over years of service.

Common Questions:

Does this control have a manual 'Off' position?
No, the Ranco A30-308 is a constant differential control designed for continuous monitoring and does not have a manual "off" click on the dial.

Can I use this for a walk-in cooler application?
While the A30-308 is common in freezers and ice machines due to its -30.5°F cold off capability, always verify your specific setpoint requirements; for higher-temperature coolers, an A12 or A30 series with a different range may be better suited.

What terminals does this unit use?
This control comes standard with 1/4 inch quick-connect terminals for fast wiring in the field.

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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.