ONS Series

ONS CO₂ condensing units are part of the Evolution Series. They are vertical discharge, air-cooled CO₂ condensing units available in several sizes. These industrial units are specifically designed to provide cooling to other equipment and CO₂ systems that incorporate evaporators.

They are factory-assembled units that consist of an air-cooled gas cooler, a Bitzer, Copeland or Dorin semi-hermetic heavy-duty compressor with frequency variator, and interconnecting pipe work. They also include a high-pressure CO₂  receiver, heat exchangers, optional heat reclaims, filter driers, an oil tank/separator, shut off valves and related controls. Base and weatherproof housing are made from heavy-gauge galvanized steel or painted steel. Unit design follows the best combination of energy efficiency, reliability, serviceability, and cost effectiveness. They are equipped with low-noise, high-efficiency 31.5″ (800mm) industrial fans.

Each condensing unit includes a control box and a wiring diagram that meets the customer’s requirements. The wiring diagram displays all the components with all the protections and the necessary controls. The unit is supplied with electronic controls.

All–Inclusive CO2 condensing Units
RefPlus’ CO₂ units are complete and ready to be incorporated into a CO₂ system. They are specially designed to supply the perfect balance between capacity, cost-effectiveness and reliability to commercial and industrial walk-in coolers and freezers. They have been designed to provide superior energy efficiency when compared to other CO₂ options or to many other traditional refrigeration alternatives. Each CO₂ unit is designed with precise line sizing to limit pressure losses, increase efficiency and enhance performance. In addition, these units require a smaller mechanical room and shorter lines, as the compressors are on the roof.

Operating Pressures
In order to adapt to any operational conditions of current and future market, all models are designed with a MWP of 1740 Psig/120 bar on the high side and 1305 Psig/90 bar on the low side.

Reliability
RefPlus CO2 condensing units are subject to a rigorous real-condition testing to ensure that components selected for use with CO₂ are compatible in all aspects. 

Controls & Communication
Each unit is controlled by a state-of-the-art PLC controller specifically designed for transcritical CO₂ condensing units. It has remote communication capabilities to access live status and graphical views of the operational parameters and setpoints through integrated RS485 serial interface connection to supervisory systems.