15
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 welding (DVM Hydro unit)
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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 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 or less.
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When welding the pipes on the connection port, cover the valve with wet cloth before welding (to protect the parts
within the valve)
Welding part
Nitrogen
Copper pipe (ø6.25 mm)
Stop valve
Taping
High pressure hose
Nitrogen
Wet cloth
Gas side (Welded)
Flowmeter
ø6.35
Pressure regulator
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.
Downward
Side
Upward
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