Scrapping And Recovery - INVENTOR DR2VI32-09WFI Benutzer- & Installationshandbuch

●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 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.
●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.
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 or a spring scale. The
connecting hose between the refrigerant cylinder and the charging equipment shall be relaxed appropriately, to avoid
impact on the measuring accuracy due to stress.
Requirements on storage site of refrigerant
●The cylinder of refrigerant shall be placed in a -10~50°C environment with favorable ventilation, and warning labels shall
be pasted;
●The maintenance tool in contact with the refrigerant shall be stored and used separately, and the maintenance tool of
different refrigerants cannot be mixed.
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;
Welding
Refrigerant Charging Procedures

Scrapping and Recovery

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