Samsung AM CNBD Series Installation Manual

17ENGLISHRefrigerant pipe welding and safety informationImportant information for refrigerant pipe workf Make sure there is no moisture inside the pipef Make sure there are no foreign substances and impurities in the pipef Make sure there is no leakagef Make sure to follow the instruction when welding or storing the pipeNitrogen flushing while brazing (DVM Hydro unit)f When brazing the refrigerant pipes, flush them with nitrogen gas as shown in the picturef If you do not perform nitrogen flushing when brazing the pipes, oxide may form inside the pipe and can cause damageto the important parts such as compressor and valves etcf Adjust the flow rate of the nitrogen flushing with a pressure regulator to maintain 0 05 m3/h (1 77 ft3/h) or lessf When brazing the pipes on the connection port, cover the valve with wet cloth before brazing (to protect the parts withinthe valve)Brazed partNitrogen Copper pipe [Φ6 35 (1/4")]Stop valveTapingHigh pressure hoseNitrogenWet clothGas side (brazed)FlowmeterΦ 6 35 (1/4")Pressure regulatorDirection of the pipe when brazingf Direction of the pipe should be headed downward or sideways when brazingf Avoid brazing the pipe with pipe direction heading upwardDownward Side Upward