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111-7. Straight Equivalent Length of JointsDesign the tubing system by referring to the following table for the straight equivalent length of joints.Table 1-7 Straight Equivalent Length of JointsGas tubing size (mm) 12.7 15.88 19.05 22.22 25.4 28.58 31.8 38.190° elbow 0.30 0.35 0.42 0.48 0.52 0.57 0.70 0.7945° elbow 0.23 0.26 0.32 0.36 0.39 0.43 0.53 0.59U-shape tube bent (R60-100 mm) 0.90 1.05 1.26 1.44 1.56 1.71 2.10 2.37Trap bend 2.30 2.80 3.20 3.80 4.30 4.70 5.00 5.80Y-branch distribution joint Equivalent length conversion not needed.Ball valve for service Equivalent length conversion not needed.Table 1-8 Refrigerant tubing (Existing tubing can be used.)Tubing size (mm)Material O Material 1/2H • Hø6.35 t0.8 ø22.22 t1.0ø9.52 t0.8 ø25.4 t1.0ø12.7 t0.8 ø28.58 t1.0ø15.88 t1.0 ø31.75 t1.1ø19.05 t1.2 ø38.1 over t1.35ø41.28 over t1.451-8. Additional Refrigerant ChargeAdditional refrigerant charge amount is calculated below.Required amount of additional refrigerant charge = [ (Amount of additional refrigerant charge per meter of each size of liquid tube xits tube length) + (...) + (...)] + [(Necessary amount of additional refrigerant charge per outdoor unit) + (...) + (...)]*Always charge accurately using a scale for weighing.* If the existing tubing is used and the amount of on-site refrigerant charge exceeds the value listed below, change the size of the tubingto reduce the amount of refrigerant.Total amount of refrigerant for the system with 1 outdoor unit: 50 kgTotal amount of refrigerant for the system with 2 outdoor units: 80 kgTotal amount of refrigerant for the system with 3 outdoor units: 100 kgTable 1-9-1 Amount of Additional Refrigerant Charge Per Meter, According to Liquid Tubing SizeLiquid tubing size 6.35 9.52 12.7 15.88 19.05 22.22 25.4Amount of additionalrefrigerant charge/m (g/m) 26 56 128 185 259 366 490Table 1-9-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor UnitU-8ME1E8(E) U-10ME1E8(E) U-12ME1E8(E) U-14ME1E8(E) U-16ME1E8(E) U-18ME1E8(E) U-20ME1E8(E)2.5 kg 3.5 kg 3.5 kg 6.4 kg 6.4 kg 7.6 kg 7.6 kgTable 1-10 Refrigerant Charge Amount at Shipment (for Outdoor Unit)U-8ME1E8(E) U-10ME1E8(E) U-12ME1E8(E) U-14ME1E8(E) U-16ME1E8(E) U-18ME1E8(E) U-20ME1E8(E)9.9 kg 9.9 kg 9.9 kg 9.9 kg 9.9 kg 9.9 kg 9.9 kg1-9. System LimitationsTable 1-11 System LimitationsMax. No. allowable connected outdoor units 3 *2Max. capacity allowable connected outdoor units 168 kW (60 hp)Max. connectable indoor units 64 *1Max. allowable indoor/outdoor capacity ratio 50 – 200 % *3*1: In the case of 22 hp (type 61.5 kW) or smaller units, the number is limited by the total capacity of the connected indoor units.*2: Up to 3 units can be connected if the system has been extended.*3: It is strongly recommended that you choose the unit so the load can become between 50 and 130%.* When bending the tubes, use a bendingradius that is at least 4 times the outerdiameter of the tubes.In addition, take sufficient care to avoidcrushing or damaging the tubes whenbending them.