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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 need sealing such as shown below.
Place
Outside
Inside
− 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.
Caution
Use the vacuum pump with the backflow prevention mechanism to prevent backflow of oil.
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.
Period of work
More than 1 month
Less than 1 month
Not specified
Vacuuming time
47
Pinch or taping
60 minutes or more
Method of seal
Pinch
Vacuum pump capacity
60 l/min or more
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