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ENGLISH
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 flushing welding
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When welding the refrigerant pipes, flush them with nitrogen gas as shown in the picture .
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If you do not perform nitrogen flushing 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 .
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Adjust the flow rate of the nitrogen flushing with a pressure regulator to maintain 0 .05m
2
/h(0 .54ft
2
/h) or less .
Welding part
Nitrogen gas
Ø 6 .35 (1/4") copper pipe
Stop valve
Taping
High pressure hose
Pressure regulator
Nitr
ogen gas
Flowmeter
Direction of the pipe when welding
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Direction of the pipe should be headed downward or in a sideways when welding .
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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