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b. Prevention measure for refrigerant piping
Prevention measure for refrigerant piping is very important work to prevent water-dust-rubbish from getting in. All
piping terminals needs sealing such as shown below.
• How to pinch
Close terminal part of piping with pliers and seal the gap with brazing.
• How to tape
Seal terminal part of piping with vinyl tape.
3. Vacuum pumping
The purpose of vacuum pumping work is to remove and dry air inside the piping or nitrogen at air tightness test.
Perform the work carefully.
4. Refrigerant filling
Refrigerant filling must be done in the state of liquid refrigerant. If this is done in gas refrigerant, the balance of refrigerant
composition will collapse and damage the operation.
Place Period of work Method of seal
Outside More than 1 month Pinch
Less than 1 month Pinch or taping
Inside Not specified
Caution
Use the vacuum pump with the backflow prevention mechanism to prevent backflow of oil.
Vacuuming time 60 minutes or more Vacuum pump capacity
60 l/min or more
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