CHS_LHS

30366461EN-08 5 LU-VE Group reserves the right to change specifications without prior notification. 1.5 Warning symbols The following warning symbols are used in LU-VE Group product & instruction manuals. General warning. Risk of malfunctioning and/or damage. Hot surfaces. Danger of burns. Wear adequate protection. Moving parts. Danger of injuries. Do not operate without protection guard mounted. Sharp surface. Danger of cutting injuries. Wear adequate protection. Overhead load. Never stand or walk below the load. Mandatory prescription. Follow instructions as provided. Forklift trucks or other logistic vehicles. Stay clear of working space. Risk of injuries. Wear head protection. Electrically powered component. Switch off power supply before any maintenance or installation activity. Risk of injuries. Wear safety footwear. Cold parts. Danger of frostbite injuries. Wear adequate protection. Risk of injuries. Wear protective gloves. Danger of crushing. Wear adequate protection. Manuals must be carefully examined and instructions should be followed up at all times. Mandatory prescription. Install or check guard. 2 General 2.1 Operating principle LU-VE Group finned coil air heat exchangers have been designed to achieve an optimized exchange of thermal energy between air and another medium. The ‘heart’ of our air heat exchangers is the finned coil, built up from a circuit of interconnected tube serpentines and fins to increase the heat exchanging surface. Thanks to the combination of key design variables (coil materials, coil geometry, casing design, fan type), air heat exchangers are very versatile products with a great variety of applications in many industries. Air coolers are key components in air cooling and refrigeration systems. On the refrigerant side the most common media are a brine or an evaporating refrigerant like HFO/HFC, ammonia or CO 2 . When an evaporating refrigerant is used, the cooling coil is the evaporator in the vapor- compression refrigeration cycle. Unit coolers constructed with copper tube coils are not suitable for use with R-717 (ammonia). For those units working with R-744 (carbon dioxide) refrigerant: • If the refrigeration system is de-energized, venting of the R-744 refrigerant through the system pressure regulating/relief valves can occur. In such cases, the system may need to be recharged with R-744, but in any case, pressure regulating /relief valves must not to be defeated or capped. The relief setting must not be altered in any way. • A sufficient number of pressure relief and pressure regulating / relief valves may need to be provided based on the system capacity and located such that no stop valve is provided between the relief valves and any parts or sections of the system being protected • The refrigeration system is under high pressure. Do not tamper with it. Contact qualified service personal before disposal.