HTW HTWS026IX69-R32 Manuel De L'utilisateur Et D'installation page 60

• Remove the refrigerant.
• Decontaminate the pipeline by inert gases.
• 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 several times. This operation shall not be carried out using compressed
air or oxygen. 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 are cleared. After the final charging
of the anaerobic nitrogen, discharge the gas into atmosphere pressure, and then the
system can be welded. This operation is necessary for welding the pipeline.
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 in vertical position.
- Make sure the grounding solutions are already taken before the system is charged
with refrigerants.
- After finishing the charging (or when it is not yet finished), indicate the load on the
system.
-Be careful not to overload the circuit with refrigerants.
Scrapping:
Before this procedure, the technical personnel shall be thoroughly familiar with the
equipment and all its features, and make a recommended practice for refrigerant safe
recovery. For recycling the refrigerant, shall analyze the refrigerant and oil samples
before operation. Ensure the required power before the test.
1. Be familiar with the equipment and operation.
2. Disconnect power supply.
3. Before carrying out this process, you have to make sure:
• lf necessary, mechanical equipment operation should facilitate the operation of
the refrigerant tank.
• AII personal protective equipment is effective and can be used correctly.
• The whole recovery process should be carried out under the guidance of qualified
personnel.
Maintenance
Procedures of charging refrigerants
Scrapping and recovery
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