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4. Selection of refrigerant pipingOutdoor unit3 piping(Liquld,discharge gas,suction gas)2 piping(Liquld, gas pipe). Outdoor unit to FS unit . FS unit to indoor unit. branching section indoor unit1 Main piping25 Header branching1st branchingsection25 Y-shape branching jointFS unit23 3 34 4 4 4 4<strong>Indoor</strong> unit< Cooling only > < Cooling only >2 2 2 Size of main pipe (Table 1)FS unit3 3 34 4 4 4 4<strong>Indoor</strong> unit< Cooling only > < Cooling only >Model name Suction gas side Discharge gas side Liquid sideMMY-MAP0801FT8 Ø 22.2 Ø 19.1 Ø 12.7MMY-MAP1001FT8 Ø 22.2 Ø 19.1 Ø 12.7MMY-MAP1201FT8 Ø 28.6 Ø 19.1 Ø 12.7 Pipe size between branching joints (*1,*2) (Table 2)Total capacity code of indoor units at downstream side Suction gas side Discharge gas side Liquid sideBelow 6.4 Ø 15.9 Ø 12.7 Ø 9.56.4 to below 12.2 Ø 22.2 Ø 19.1 Ø 12.712.2 to below 16.2 Ø 28.6 Ø 22.2 Ø 15.9 Pipe size between the end of branch and FS unit (Tabel 3)Total capacity code of indoor units at downstream side *1 Suction gas side Discharge Gas Pipe Liquid Pipe Piping of indoor unit (Table 4)Below 1.7 Ø 12.7 Ø 9.5 Ø 6.41.7 to below 6.4 Ø 15.9 Ø 12.7 Ø 9.5Capacity rank of indoor unit Gas side Liquid side007 type to 012 type (15m or less) Ø 9.5 Ø 6.4007 type to 012 type (15m or more) *7 Ø 12.7 Ø 6.4015 type to 018 type Ø 12.7 Ø 6.4024 type to 056 type Ø 15.9 Ø 9.5 Selection for branching section (Table 5)Total capacity code ofindoor unit *1For 3 PipingModel nameFor 2 PipingY -shape branching joint Below 6.4 RBM-BY53FE RBM-BY53E*3 *4 6.4 to below 14.2 RBM-BY103FE RBM-BY103EBranching header Below 14.2 RBM-HY1043FE RBM-HY1043E*3 *4 *5 Below 14.2 RBM-HY1083FE RBM-HY1083E Selection for FS unit (Table 6)Model nameRBM-Y1121FERBM-Y1801FECapacity rank for indoor unit007 type to 030 type036 type to 056 type Minimum wall thickness for R410Aapplication (Table 7)*1 In case the pipe size between branches exceeds the size of main pipe, it should be as same as the size of main pipe.*2 2 pipes for cooling only indoor unit shall be used with liquid pipe and suction gas pipe.*3 Branching pipe on the 1st branch should be selected accoroding to the capacity code for outdoor unit.*4 In case total capacity code for indoor units shall be exceeded to capacity code for outdoor unit, the pipe size shouldbe selected with capacity code for outdoor unit.*5 For 1 line after header branching, indoor units with a maximum of 6.0 capacity code in total can be connected.*6 If the pipe size exceeds Ø19.0, use half hard or hard type for material of the pipe.*7 If the pipe length between the branch section and “cooling only” indoor unit exceeds 15m, use the Ø12.7 pipe as the gas side.26SoftHalf hard orhardOD (Inch)OD (mm)Minimum wallthickness (mm)OK OK 1/4” 6.35 0.80OK OK 3/8” 9.52 0.80OK OK 1/2” 12.70 0.80OK OK 5/8” 15.88 1.00NG OK 3/4” 19.05 1.00NG *6 OK 7/8” 22.20 1.00NGOK 1.1/8” 28.58 1.00
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