Cooling & Heat Exchange RO Series Air/Oil Heat Exchanger 86 Maintenance Cleaning oil side After having dismantled the exchanger, carry out the cleaning procedure by circulating de-greasing substance inside the radiator compatible with steel. Wash with hydraulic oil before reconnecting the cooler. Cleaning air side Carry out this procedure using compressed air. Make sure that the direction of the jet is parallel to the fins so that they are not damaged. If the blockage of the exchanger is caused by build up of oil or grease, cleaning can be carried out using a jet of steam or hot water. During cleaning procedures the electric motor must be adequately protected. Safety » Do not remove the fan grilles. » Electrical connections must be made by skilled electricians in accordance with the attached electrical diagrams. » Exterior surfaces of heat exchangers may reach high temperatures so adequate guards must be installed or the unit must be mounted in an inaccessible position. » Do not perform work on the hydraulic motor until the hydraulic pipelines have been disconnected. How to Select the Correct Heat Exchanger To choose right heat exchanger follows the below example: Power to dissipate: 8 kW. Oil flow ISO VG 46: 50 litres/min. Inlet oil temperature: 80°C. Ambient temperature: 40°C. Electric fan: 12 Volt. You can calculate the specific coefficient of heat exchange (kW/°C) if you divide the power to dissipate with the difference between oil input temperature and ambient temperature: 8KW : 40°C (80°C - 40°C) = 0.20 kW/°C. Note the oil flow (50 litres/min) and specific exchange power (0.20 kW/°C) and research the cooler that has in performance diagram this result with direct electric fan.
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