Daikin BS4Q14AV1 Installation Manual

Contents

8 English6-1 Pipe size selectionSelect the size of piping between the outdoor unit (refrigerant branch kit) and the BS unit and between theBS unit and indoor units (refrigerant branch kits) based on example connections 1 and 2 below and Tables3 through 5.Example connection 1 : When connecting 1 indoor unit downstream of the BS unitUpstream DownstreamDownstreamIndoor unitBS unitSuction gas pipeHP/LP gas pipeLiquid pipeLiquid pipeGas pipeTo outdoor unitor refrigerantbranch kitTable 5Select a size from Table 3 based on thetotal capacity of the indoor units to beconnected downstream. Select a size from Table 4 based on theindoor unit capacity type.Example connection 2 : When there is a branch downstream from the BS unitSelect a size from Table 3based on the total capacityof the indoor units to beconnected downstream.Refer to the installation manualincluded with the outdoor unit or theequipment design materials to deter-mine the size of the pipes between theBS unit and the refrigerant branch kitsand between the refrigerant branchkits and indoor units.UpstreamSuction gas pipeHP/LP gas pipeLiquid pipeBS unitDownstreamIndoor unit Indoor unitIndoor unitRefrigerant branch kitLiquid pipeGas pipeTable 5To outdoor unitor refrigerantbranch kitTable 3 Total indoor unit capacity and pipe size Unit: mmTotal indoor unit capacity(Q)Pipe size (outside diameter × minimum thickness)Upstream DownstreamSuction pipe HP/LP gas pipe Liquid pipe Gas pipe Liquid pipeQ < 150 ϕ15.9 × 1.0 ϕ12.7 × 0.8ϕ9.5 × 0.8ϕ15.9 × 1.0ϕ9.5 × 0.8150 ≤ Q < 200 ϕ19.1 × 1.0 ϕ15.9 × 1.0 ϕ19.1 × 1.0200 ≤ Q < 290 ϕ22.2 × 1.0 ϕ19.1 × 1.0 ϕ22.2 × 1.0290 ≤ Q < 420 ϕ28.6 × 1.0 ϕ12.7 × 0.8420 ≤ Q < 640 ϕ28.6 × 1.0 ϕ15.9 × 1.0640 ≤ Q ≤ 750 ϕ34.9 × 1.2 ϕ19.1 × 1.0• In case of connection to the main pipe, refer to the installation manual included with the outdoor unit orthe equipment design materials.Table 4 Indoor unit connection pipe size Unit: mmIndoor unit capacity type Pipe size (outside diameter × minimum thickness)Gas pipe Liquid pipe20, 25, 32, 40, 50 ϕ12.7 × 0.80 ϕ6.4 × 0.8063, 80, 100, 125 ϕ15.9× 1.0ϕ9.5 × 0.80200 ϕ19.1 × 1.0250 ϕ22.2 × 1.0