Panasonic WU-192ME2U9 Technical Data Manual - Page 63

4. Installation Instructions Design of 2WAY VRF SYSTEM l Precautions for brazing Be sure to replace the air inside the tube with nitrogen to prevent oxide film from forming during the brazing process. Be sure to use a damp cloth or other means to cool the valve unit during brazing. Work method Field-supply tube Remote valve Pressure-reducing valve (regulator) Nitrogen Brazing locations Taping 1 1. Be sure to use nitrogen. (Oxygen, CO2, and CFC must not be used.) CAUTION 2. Use a pressure-reducing valve on the nitrogen tank. 2 3. Do not use agents intended to prevent the formation of oxide film. They will adversely affect the refrigeration oil, and may cause equipment failure. 4. The balance tube is not used if only 1 outdoor unit is installed. Use the unit in the same conditions as when it was shipped from the factory. 3 4 5 6 7 8 2 - 47 9