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13. Installation
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.
Nitrogen flushing while brazing (DVM Hydro unit)
• When brazing the refrigerant pipes, flush them with nitrogen gas as shown in the picture.
• 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.
• Adjust the flow rate of the nitrogen flushing with a pressure regulator to maintain 0.05 m
• 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
Pressure regulator
Nitrogen
Direction of the pipe when brazing
• Direction of the pipe should be headed downward or sideways when brazing.
• Avoid brazing the pipe with pipe direction heading upward.
Downward
Φ 6 .35 (1/4")
Taping
Stop valve
Copper pipe [Φ6 .35 (1/4")]
Flowmeter
High pressure hose
Side
3
/h (1.77 ft
3
/h) or less.
Wet cloth
Gas side
(brazed)
Upward
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