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Refrigerant pipe installation
Keeping refrigerant pipe
To prevent foreign materials or water from entering the pipe, storing method and sealing method (especially during
installation)is very important. Apply correct sealing method depending on the environment.
Exposure place Exposure time Sealing type
Outdoor
Longer than one month Pipe pinch
Shorter than one month Taping
Indoor - Taping
Refrigerant pipe welding and safety information
Important information for refrigerant pipe work
• Make sure there is no moisture inside the pipe.
• Make sure there are no foreign substances and impurities in the pipe.
• Make sure there is no leakage.
• Make sure to follow the instruction when welding or storing the pipe.
CAUTION
Nitrogen ushing welding
f When welding the refrigerant pipes, ush them with nitrogen gas as shown in the picture.
f If you do not perform nitrogen ushing when welding the pipes, oxide may form inside the pipe. It can cause the
damage of the important parts such as compressor and valves etc.
f Adjust the ow rate of the nitrogen ushing with a pressure regulator to maintain 0.05m
2
/h or less.
Welding part
Nitrogen gas
Ø 6.35 copper pipe
Stop valve
Taping
High pressure hose
Pressure regulator
Nitrogen gas
Flowmeter
Direction of the pipe when welding
f Direction of the pipe should be headed downward or in a sideways when welding.
f Avoid welding the pipe with pipe direction heading upward.
• When you test gas leakage after welding the pipes, use a designated solution for gas leakage detection. If you
use the detection solution that includes sulfuric ingredient, it may cause corrosion to the pipes.
CAUTION
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