17
ENGLISH
Refrigerant pipe welding and safety information
Important information for refrigerant pipe work
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Make sure there is no moisture inside the pipe .
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Make sure there are no foreign substances and impurities in the pipe .
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Make sure there is no leakage .
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Make sure to follow the instruction when welding or storing the pipe .
Nitrogen flushing while brazing (DVM Hydro unit)
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When brazing 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 brazing the pipes, oxide may form inside the pipe and can cause damage
to 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 .05 m
3
/h (1 .77 ft
3
/h) or less .
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When brazing the pipes on the connection port, cover the valve with wet cloth before brazing (to protect the parts within
the valve)
Brazed part
Nitrogen
Copper pipe [Φ6 .35 (1/4")]
Stop valve
Taping
High pressure hose
Nitrogen
Wet cloth
Gas side (brazed)
Flowmeter
Φ 6 .35 (1/4")
Pressure regulator
Direction of the pipe when brazing
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Direction of the pipe should be headed downward or sideways when brazing .
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Avoid brazing the pipe with pipe direction heading upward .
Downward
Side
Upward
DB68-12327A-00_IM_DVM Hydro HT_AA_EN_.indd 17
DB68-12327A-00_IM_DVM Hydro HT_AA_EN_.indd 17
2023-06-15 오전 10:37:24
2023-06-15 오전 10:37:24
