Daikin VRV IV Series Installation Manual

Contents

Daikin VRV IV Series Installation Manual Manual pdf 9 page image

3P405106-10 English 6• For information regarding the piping allowable maximum length, allowable height difference, and allow-able length after a branch, refer to the installation manual that came with the outdoor unit or EngineeringData Book.• The refrigerant branch kit (sold separately) is required for piping branches. For information on how toselect a refrigerant branch kit, refer to the installation manual that came with the outdoor unit or Engi-neering Data Book.5-2 Protection against contamination when installing pipesProtect the piping to prevent moisture, dirt, dust, etc. from entering the piping.Place Installation period Protection methodOutdoor More than a month Pinch the pipeLess than a month Pinch or tape the pipeIndoor Regardless of the periodNOTEExercise special caution to prevent dirt or dust when passing piping through holes in walls and when pass-ing pipe edges to the exterior.5-3 Pipe connection work precautions• When brazing refrigerant piping, begin working after replacing the nitrogen (*1) or perform brazing whilenitrogen is flowing in the refrigerant piping (*2) (refer to Fig. 5).(*1) For details on nitrogen replacement, see the “VRV Installation Manual” (available at any Daikindealer).(*2) The pressure regulator for the nitrogen released when doing the brazing should be set to about2.9 psi (0.02 MPa) (enough to feel a slight breeze on your cheek).Refrigerant piping ValvePressure-reducing valvePart to be brazed TapingNitrogen NitrogenFig. 5NOTE• Do not use an anti-oxidizing agent when brazing the piping. Residual debris could clog the piping orcause parts to malfunction.• Do not use a flux when brazing the refrigerant pipe joints.Using a chlorine flux may cause the pipes to corrode, and if it contains fluoride it may cause the refriger-ant lubricant to deteriorate, adversely affecting the refrigerant piping system.Use phosphor copper brazing (B-Cu93P-710/795: ISO 3677) which does not require flux.5-4 Pipe size selectionFrom Example of connection 1 and 2 below and Table 3, 4 and 5 select the piping size between the out-door unit (refrigerant branch kit) and Branch Selector unit, and between the Branch Selector unit and theindoor unit (refrigerant branch kit).