Panasonic CS-F14DB4E5 Service Manual page 52

2. Installation work
a. Brazing work
Brazing work needs replacing air inside pipe with nitrogen gas in order to prevent oxidation scale from occurring. This
is called nitrogen replacement, and one of very important work in brazing refrigerant piping. (Oxidation preventive is
not possible to use)
b. Prevention measure for refrigerant piping
Prevention measure for refrigerant piping is very important work to prevent water-dust-rubbish from getting in. All pip-
ing terminals needs 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.
Use the vacuum pump with the backflow prevention mechanism to prevent backflow of oil.
Caution
Period of work
More than 1 month
Less than 1 month
Not specified
Vacuuming time
52
Pinch or taping
60 minutes or more
Method of seal
Pinch
Vacuum pump capacity
60 l/min or more