Panasonic WU-216MF2U9 - Technical Data Manual - Page 26

1. Model Selectionng and Capacity Calculator Design of 3WAYYVVRRFFSSYYSSTTEEMM Table 10 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit Further charge a certain amount listed below in addition to the amount of refrigerant charge. Combination number of outdoor unit 1 2 3 Additional amount oz (g) 70.5 (2,000) 141.0 (4,000) 212 (6,000) Necessary Amount of Additional Refrigerant Charge for All Indoor Unit Cooling Capacity Charge a refrigerant amount calculated in the following formula according to the total amount of indoor unit cooling capacity. Additional refrigerant amount when cooling capacity is BTU/h = Cooling capacity (BTU/h) × 1.034 × 0.001 + 10.6 (oz) or Additional refrigerant amount when cooling capacity is kW = Cooling capacity (kW) × 1000 × 0.1 + 300 (g) Table 11 Necessary Amount of Additional Refrigerant Charge Per ft. (or per meter), According to Discharge Tubing Size inch ø1/2" ø5/8" ø3/4" ø7/8" ø1-1/8" ø1-3/8" 1 Discharge tubing size (mm) (ø12.7) (ø15.88) (ø19.05) (ø22.22) (ø28.58) (ø34.92) Additional amount oz/ft. (g/m) 0.129 (12) 0.226 (21) 0.333 (31) 0.441 (41) 0.763 (71) 1.118 (104) *Additional refrigerant charge amount of discharge tubing should be less than 317 oz (9,000g). 2 1-7. System Limitations Table 12 System Limitations Max. No. allowable connected outdoor units 3 *2 Maximum number of connectable indoor units when connected with minimum capacity Max. capacity allowable connected outdoor 360,000 BTU/h units (30 ton, 105.5 kW) Total system Number of Total system Number of tonnage indoor units tonnage indoor units 3 Max. connectable indoor units 52 *1 Max. allowable indoor/outdoor capacity ratio 50 - 150 % *3 *1: In the case of 20 ton (70.3kW) 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. 6 14 16 38 8 19 18 43 10 24 20 48 12 28 22~30 52 14 33 *3: It is strongly recommended that you choose the unit so the load 4 can become between 50 and 130%. Table 13 System Limitations of Total Refrigerant Amount Combination number of outdoor unit 1 2 3 Upper limit oz (g) 1,763 (50,000) 2,821 (80,000) 3,703 (105,000) 5 Make sure the values calculated using the following formula should not exceed the maximum allowable values (Table 13). Total refrigerant amount = Refrigerant charge amount at shipment (for outdoor unit) + Necessary amount of additional refrigerant charge per ft. (or per meter) according to liquid tubing size + Necessary amount of additional refrigerant charge per outdoor unit + Necessary amount of additional refrigerant charge for all indoor unit cooling capacity + Necessary amount of additional refrigerant charge per ft. (or per meter) according to discharge tubing size 6 7 8 9 2 - 10