Removal And Vacuum Pumping; Procedures Of Charging Refrigerants - Beko BEMPE 090 Manual Del Usuario

16 Maintenance notice

16.6 Removal and vacuum pumping

1. Make sure there is no ignited fire source near the outlet of the vacuum pump and the ventilation is
well.
2. Allow the maintenance and other operations of the refrigeration circuit should be carried out
according to the general procedure, but the following best operations that the flammability is
already taken into consideration are the key. You should follow the following procedures:
• Remove the refrigerant.
• Decontaminate the pipeline by inert gases.
• Evacuation.
• Decontaminate the pipeline by inert gases again.
• Cut or weld the pipeline.
3. The refrigerant should be returned to the appropriate storage tank. The system should be blown
with oxygen free nitrogen to ensure safety. This process may need to be repeated for several
times. This operation shall not be carried out using compressed air or oxygen.
4. Through blowing process, the system is charged into the anaerobic nitrogen to reach the working
pressure under the vacuum state, then the oxygen free nitrogen is emitted to the atmosphere, and
in the end, vacuumize the system. Repeat this process until all refrigerants in the system is cleared.
After the final charging of the anaerobic nitrogen, discharge the gas into the atmosphere pressure,
and then the system can be welded. This operation is necessary for welding the pipeline.

16.7 Procedures of charging refrigerants

As a supplement to the general procedure, the following requirements need to be added:
- Make sure that there is no contamination among different refrigerants when using a refrigerant
charging device. The pipeline for charging refrigerants should be as short as possible to reduce the
residual of refrigerants in it.
- Storage tanks should remain vertically up.
- Make sure the grounding solutions are already taken before the refrigeration system is charged
with refrigerants.
- After finishing the charging (or when it is not yet finished), label the mark on the system.
- Be careful not to overcharge refrigerants.
Free match split type air conditioner / User Manual
43 / 172 EN