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Zanussi ZS12V70CCHI Service Manual
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21R-410A expands significantly when heated. Exposure of a container to direct sunlight or other heat source can cause it to burst,resulting in serious injury. Allied Signal recommends that its cylinders not be allowed to exceed 52°C. Care also should be taken toavoid damage to containers that could cause them to leak or rupture. Storage near corrosive chemicals or fumes or on damp floorsshould be avoided.Although R-410A is not flammable, it may become combustible at elevated pressures in the presence of large quantities of air.Containers and recovery/recycling equipment should not be exposed to welding, brazing, open flames, or high temperatures untilthoroughly purged of all traces of liquid and vapour. Recovery and recycling systems with self-purging capabilities are invaluable forthis purpose.Other common sense precautions for storing and handling R-410A include:– using personal protective equipment (e.g., side shield glasses and safety shoes) when handling containers– avoiding skin contact, which may cause frostbite– protecting containers from damage, and hoses from cuts or abrasions– storing containers under a roof to protect them from weather extremes– never attempting to repair or alter containers or valves.As stated previously, the energy efficiency of R-410A is allowing the design of smaller, more efficient air conditioning equipment. Byfollowing the procedures and noting the precautions provided in this article, the technician can readily service systems using thisincreasingly popular refrigerant.The following is a quick review of some of the most important points to remember when you are working with R-410A:– Never vent R-410A (or any other refrigerant) to the atmosphere.– Use good piping practices when installing units with R-410A. (Piping practices are similar to those recommended for R-22systems.)– R-410A operates at pressures 50 to 70% higher than those of R-22. Be certain that servicing equipment and replacementcomponents are designed to operate with this refrigerant.– R-410A cylinders are rose coloured (PMS 507).– Recovery cylinders must be rated at 27 bar or higher– Charge systems with liquid refrigerant to avoid fractionation.– Manifold sets should be at 52 bar (high side) and 14 bar (low side), with a 35 bar low-side retard.– Use hoses with a 52 bar service pressure rating.– R-410A is compatible with POE oils. POE oils absorb moisture rapidly. Do not expose the oil to the atmosphere. Keep allcomponents sealed until the time of installation/brazing.6.3 R410a Charging Instruction– R410a should be charged only at liquid phase into the air conditioner.– Never to charge 410a with vapour state during the charging process.– The refrigerant tank should be placed upside down every time.– The original charging hose should be used for R410a. Because the hose type is different than R22.– R22 hoses can not fix the service valve on the unit.–There are two options which we can charge the R410a into the system;:1. No Refrigerant Leakage on the SystemThis option can be required when the compressor, condenser, 4 way valve, etc. are changed in the system.The authorized technician can apply this process only.The vacuum operation should be applied to the unit first at least 1 hour after the replacing any parts which it is specified above.The charging process can be start if there is no any leakage on the system. The authorized technician should be checked thevacuum quality on the manifold gauge.The gauge should be displayed -760 mmHG or -1 Bar Gauge if there is no any leakage after the vacuum pump is stopped.Otherwise the pressure will increase if there is any leakage on the system after the vacuum pump is stopped.The leakage point should be found and repaired if there is any leakage.The charging process should be proceed only with a calibrated electronic scale.The refrigerant tank should be placed on the scale after the manifold and refrigerant hose fixed to the unit’s service valve. The tankshould be placed always upside down.Always a little bit refrigerant should be set free to the ambient to prevent the air inside the hole in to the unit.It is best and certain way to charge the R410a by using the required amount according to the unit’s name plate. Please check theunit’s name plate always to see the correct amount.The additional amount should be added if the piping length is longer than 4 meters according to unit’s specs.Please check the required additional refrigerant amount for every unit on its spec sheet.The required amount should be charged according to amount by using electronic scale. Only the liquid phase of refrigerant shouldbe charged.The compressor shouldn’t be run during the charging process. |
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