Ranco A30-311 Refrigeration Control

The Ranco A30-311 is a high-performance constant cut-in cold control designed for precise commercial refrigeration temperature regulation. This single-pole, single-throw (SPST) switch features a 42-inch capillary tube, engineered to monitor evaporator temperatures in reach-ins, beverage coolers, and vending equipment. The A30 series is specifically optimized for applications requiring a fixed cut-in temperature of 41°F, standardizing the defrost cycle regardless of the cut-out adjustment. This ensuring coils remain clear of ice while maintaining tight product temperature tolerances. Designed with a heavy-duty frame and high-amperage contacts, the Ranco A30-311 temperature control serves as a reliable HVACR replacement part for original equipment manufacturers. Its laser-welded bellows construction offers enhanced durability against pressure spikes and mechanical fatigue typical in high-cycle commercial environments. For contractors, the universal mounting bracket and standard 1/4-inch spade terminals ensure a streamlined installation during field service calls.

Technical Specifications and Benefits:

• Constant Cut-In Precision: Provides a fixed 41°F cut-in to ensure consistent defrosting between cooling cycles.
• Adjustable Range: Allows for fine-tuning the cold-point differential to meet specific cabinet load requirements.
• Extended Reach: The 42-inch refrigeration control capillary offers routing flexibility for various evaporator coil configurations.
• Reliable Switching: Rated for high-amperage inductive loads, reducing the risk of contact pitting and premature component failure.
• Service Versatility: Widely used in bottle cooler repair and professional chilling applications.

Common Installation and Operation Questions:

What is the primary function of a constant cut-in control?
Unlike standard thermostats, a constant cut-in control like the Ranco A30-311 ensures the compressor does not restart until the evaporator has reached a specific temperature, usually above freezing, to facilitate effective off-cycle defrosting.

Can this control be used for freezer applications?
No, this specific model is calibrated for medium temperature refrigeration. Its cut-in settings are optimized for 38°F to 42°F ranges, making it unsuitable for low-temperature freezer units.

Is the capillary tube meant to be field-shortened?
Never cut or kink the capillary tube. This line contains a specific gas charge; any breach or sharp restriction will render the sensor inoperable and the control useless.

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.