CHS_LHS

30366461EN-08 8 LU-VE Group reserves the right to change specifications without prior notification. adequately attached to the walls/ceilings of the cold room and not only to the cooler itself. Pipework must be adequately supported to prevent vibration or external load on the cooler headers, etc. Some traces of a transparent liquid may remain inside the coil circuit after the manufacturing process. This is evaporative oil which is completely compatible with all refrigerants and refrigeration oils in current use. This oil can sometimes collect in small quantities inside the coil header connections where it may be observed by installing personnel when removing the factory caps. It can be easily verified that this is oil and not water due to the fact that it evaporates very quickly when touched. If a drop of it is placed on a flat surface it widens out quickly like a stain and if exposed to flame it burns readily, giving off a white smoke. 3.5 Moisture in the refrigeration system Moisture in a refrigeration system is undesirable. Moisture can cause malfunctioning in the refrigeration operation. A lesser known problem is that small amounts of moisture in the refrigeration system can after a time cause leakage through the formation of frost clumps. These frost clumps are the result of moisture seeping from the refrigeration system during defrost, as water seeps into the soldering seams and then freezes, resulting in a volume increase. This process repeats itself during each freeze/defrost cycle, as a result of which the cavities (potholes) thus formed become steadily larger and ultimately burst, causing leakage. 3.6 Using secondary refrigerants In order to avoid crystallisation, and the consequent erosion of the circuit, the temperature of the secondary refrigerants may never fall below the protection temperature of the relevant secondary refrigerant. To avoid circuit erosion, the flow rate may not exceed the design value as indicated in the product specification without prior permission from LU-VE Group. The secondary refrigerant used must have protective agents against oxidation, corrosion, erosion, furring, rust, etc. and may not contain any contaminants. Secondary refrigerants may only be used in a closed system. The new cooling equipment and associate piping should be thoroughly rinsed with a mild cleaning solution or high-quality water and completely drained before brine is added. Pre-cleaning chemistry should be compatible with the construction material of the refrigeration equipment. Note: The unit does not drain completely by gravity. Use pressurized air for complete draining. When the system has been filled, it must be completely de-aerated. Deaeration of a secondary circuit is of major importance in all instances since oxygen contributes towards corrosion, in the worst scenarios leading to circuit leakage, and other problems and affects inhibitors. For correct design, de-aeration and operation always follow instructions given in the secondary refrigerant manufacturer manual. Particular attention is required when using potassium formiate based heat transfer fluids: the piping system and venting/draining valves of the heat transfer section must be adapted for the heat transfer fluid in question. 3.7 Distributor position DX or pumped system In order for a refrigerant liquid distributor to function well, it is of the utmost importance that the positioning of the liquid distributor and the refrigerant supply line be vertical. The positioning of the expansion valve and, if applicable, hot gas connections must be in accordance with good refrigeration design and installation practice. Any mounting instructions as given in the instruction manuals from additional components like the expansion valve must be carefully followed up. 3.8 Refrigerant distribution The internal refrigerant circuiting, refrigerant connections and liquid distributor are arranged according to design parameters that must be specified when placing the order. Ensure that the user conditions of air coolers are in accordance with the design conditions. 3.9 Electrical connections All electrical connections must be made in accordance with the locally valid regulations and in conformance with good installation practice. Route cables so that they cannot be touched by any rotating parts. The site supply voltage, frequency, accepted power rating and number of phases must comply with the details on the technical documentation. All electrical supply lines must be connected to the terminal boxes through suitable waterproof glands using bottom entry or, in case of horizontal installation, the cable is routed to form a water trap.