CMSQ200+250A7W1BAir conditioning system4PW47543-1Installation manual56.3. Pipe connectionBe sure to perform a nitrogen blow when brazing and to read theparagraph "Caution to be taken when brazing refrigerant piping" onpage 4 first.6.4. Connecting the refrigerant piping1 Front connection or side connectionInstallation of refrigerant piping is possible as front connection orside connection (when taken out from the bottom) as shown inthe figure.2 Removing the pinched pipingWhen connecting refrigerant piping to the outdoor unit, firstremove the pinched piping. Do not vent gases into theatmosphere.Removing of the pinched piping must be carried out according tothe following procedure:1. Make sure the stop valves are closed.2. Connect a charge hose to the service ports of all stopvalves.3. Recover the gas from the pinched piping.4. When all the gas is recovered from the pinched piping,dissolve the brazing using a burner and remove thepinched piping.See figure 7.3 One outdoor unit installed(See figure 6)■ Front connection:Remove the stop valve cover to connect.■ Bottom connection:Remove the knock holes on the bottom frame and route thepiping under the bottom frame.NOTE The pressure regulator for the nitrogen released whendoing the brazing should be set to 0.02 MPa or less.(See figure 9)Do not use anti-oxidants when brazing the pipe joints.Residue can clog pipes and break equipment.1 Left-side connection2 Front connection3 Right-side connectionNOTE Precautions when knocking out knock holes■ Be sure to avoid damaging the casing■ After knocking out the holes, we recommend youremove the burrs and paint the edges and areasaround the edges using the repair paint to preventrusting.■ When passing electrical wiring through the knockholes, wrap the wiring with protective tape toprevent damage.Any gas remaining inside the stop valve may blow offthe pinched piping, causing damage or injury.1 Refrigerant piping2 Location to be brazed3 Nitrogen4 Taping5 Manual valve6 Regulator7 Nitrogen1 2 31 Pinched piping2 Stop valve3 Service port4 Point of melting the brazing metalPrecautions when connecting field piping.■ Perform brazing at the gas stop valve beforebrazing at the liquid stop valve.■ Add brazing material as shown in the figure.■ Be sure to use the supplied accessory pipeswhen carrying out piping work in the field.■ Be sure that the field installed piping does nottouch other pipes, the bottom panel or sidepanel. Especially for the bottom and sideconnection, be sure to protect the piping withsuitable insulation, to prevent it from coming intocontact with the casing.A Front connectionRemove the stop valve cover to connect.B Bottom connection:Remove the knock holes on the bottom frame and route the pipingunder the bottom frame1 Gas pipe stop valve2 Liquid pipe stop valve3 Service port for adding refrigerant4 Gas side accessory pipe (1)5 Gas side accessory pipe (2)6 Liquid side accessory pipe (1)7 Liquid side accessory pipe (2)8 Brazing9 Gas side piping (field supply)10 Liquid side piping (field supply)11 Punch the knockout holes (use a hammer)