DC INVERTER MULTI VRF INSTALLATION
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Copper pipe shall not be inserted too much for connection with branch pipe:
6.7 Welding of Copper Pipe
1）Braze welding
Materials for braze welding
There are two kinds of braze welding, soft braze welding and hard braze welding. Hard braze
welding is required in this case.
Selection of braze welding
Red copper + red copper
：brazing filler metal is Bcu93P（GB 6418），and welding flux is not needed.
Flame flux: capable of preventing the surface of copper pipes from oxidation, recommended for
use
Temperature for braze welding
：820-860℃ (copper pipe becomes light red)
2
）Safety acknowledgement before operation
a. Roll calling of construction personnel and confirmation on their health status.
b. Acknowledgement on work suits
（helmets, clothes, safety bags and safety shoes）
c. Description of work location and environment
d. Job division shall be made. Job content, method and order shall be indicated. Risk prediction
activities shall be performed.
e. “Construction Schedule” shall be worked out.
f. Head of each group shall be assigned.
g. Risks of occurrence of an accident such as electric shock or fire shall be indicated.
Branch pipe
Copper pipe
Correct connection
Wrong connection
Copper pipe
Correct connection
Wrong connection
Branch pipe
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