Panasonic U-72MF2U9 Installation Instructions Manual

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Panasonic U-72MF2U9 Installation Instructions Manual Manual pdf 11 page image

11Table 11 Necessary Amount of Additional Refrigerant Charge Per Outdoor UnitFurther charge a certain amount listed below in addition to the amount of refrigerant charge.Combination number of outdoor unit 1 2 3Additional 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 CapacityCharge 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 12 Necessary Amount of Additional Refrigerant Charge Per ft. (or per meter), According to Discharge Tubing SizeDischarge tubing size inch ø1/2" ø5/8" ø3/4" ø7/8" ø1-1/8" ø1-3/8"(mm) (ø12.7) (ø15.88) (ø19.05) (ø22.22) (ø28.58) (ø34.92)Additional amount oz/ft. 0.129 0.226 0.333 0.441 0.763 1.118(g/m) (12) (21) (31) (41) (71) (104)1-9. System LimitationsTable 13 System LimitationsMax. No. allowable connected outdoor units 3 *2Max. capacity allowable connected outdoorunits360,000 BTU/h(30 ton, 105.5 kW)Max. connectable indoor units 52 *1Max. allowable indoor/outdoor capacity ratio 50 – 150 % * 3*1: In the case of 20 ton (70.3kW) or smaller units, the number islimited 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 loadcan become between 50 and 130%.Table 14 System Limitations of Total Refrigerant AmountCombination number of outdoor unit 1 2 3Upper limit oz (g) 1,763 (50,000) 2,821 (80,000) 3,703 (105,000)Make sure the values calculated using the following formula should not exceed the maximum allowable values (Table 14).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 sizeMaximum number of connectable indoor unitswhen connected with minimum capacityTotal systemtonnageNumber ofindoor unitsTotal systemtonnageNumber ofindoor units6 14 16 388 19 18 4310 24 20 4812 28 22~30 5214 33* Additional refrigerant charge amount of discharge tubing should be less than 317 oz (9,000g).