Haier 1U25S2SQ1FA [13/54] Refrigerant charging procedures
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Haier 1U25S2SQ1FA [13/54] Refrigerant charging procedures

Haier 1U25S2SQ1FA [13/54] Refrigerant charging procedures


             

 
 
 
 
      





             




 

 

               




 


 
 
 
 
 
            
              


               

                






 
 
 
 
 
 
 
 
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Removal and Vacuumizing The maintenance or other operations of the refrigeration circuit shall be made as per conventional procedures Moreover the flammability of refrigerant shall also be mainly considered The following procedures shall be followed Refrigerant clearing Pipeline purification with inert gas Vacuumizing Pipeline purification again with inert gas Pipeline cutting or welding The refrigerant shall be recovered to a proper cylinder The system shall be purged with OFN to ensure safety The step above may need to be repeated for several times Compressed air or oxygen cannot be used for purging In the course of purging OFN shall be charged inside the refrigeration system under vacuum state to reach the operating pressure Afterwards the OFN shall be discharged to the atmosphere Finally the system shall be vacuumized The step above shall be repeated until all the refrigerants in the system are cleared The OFN charged English for the last time shall be discharged to the atmosphere Afterwards the system can be welded The operation above is necessary in case of pipeline welding It shall be guaranteed that no alight fire source is around the outlet of the vacuum pump and the ventilation is favorable Welding Favorable ventilation must be guaranteed in the maintenance area After the maintenance machine is subject to the vacuumizing above the system refrigerant can be discharged on the outdoor unit side Before the outdoor unit is welded it must be guaranteed that no refrigerant is inside the outdoor unit and the system refrigerant has been discharged and cleared The refrigeration pipelines cannot be cut with a welding gun under any circumstance The refrigeration pipelines must be disassembled with a pipe cutter and the disassembly must be carried out around a ventilation opening Refrigerant Charging Procedures The following requirements are added as the supplementation of conventional procedures During the use of refrigerant charging tools cross contamination of different refrigerants shall be avoided The total length including the refrigerant pipelines shall be shortened as much as possible to reduce the residual of refrigerant inside The cylinders of refrigerant shall be kept upright Before refrigerant charging the refrigeration system shall be earthed A label must be pasted on the refrigeration system after refrigerant charging Excessive charging is not allowed the refrigerant shall be charged slowly In case system leakage is identified refrigerant charging is not allowed unless the leak point is plugged During refrigerant charging the charging amount shall be measured with an electronic scale The connecting hose between the refrigerant cylinder appropriately to avoid impact on the measuring accuracy due to stress and the charging scale equipment or shall be a spring relaxed Requirements on storage site of refrigerant The cylinder of refrigerant shall be placed warning labels shall be pasted The maintenance tool in contact with the maintenance tool of different refrigerants cannot be mixed in a 10 50 C refrigerant shall environment be stored with and favorable used ventilation separately and and the Scrapping and Recovery Scrapping Before scrapping the technician shall be completely familiar with the equipment and all its features The safe recovery of refrigerant is recommended In case the refrigerant recovered needs to be reused before which the sample of refrigerant and oil shall be analyzed The power supply required shall be guaranteed before tests 1 The equipment and operation shall be well known 2 Power supply shall be switched off 3 The followings shall be guaranteed before scrapping The mechanical equipment shall be convenient for operation on the cylinder of refrigerant if necessary All personal protective equipment is available and being used correctly The whole course of recovery shall be guided by qualified personnel The recovery equipment and cylinders shall be in line with corresponding standards 4 The refrigeration system shall be vacuumized if possible 10

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