1-371This unit requires no additional refrigerantcharge up to tubing length 30 m. In caseof more than 30 m, additional refrigerantcharge is required. Refer to Tables 1-1 and1-3.In case of multi type installation, indoorunits should be installed within thesame room. If multi type indoor units areinstalled in different rooms, temperaturecontrol may develop problems becausethermostat operation must follow thethermostat condition of 1 indoor unit only(the main unit).1.2.Always check the gas densityfor the room in which the unit isinstalled.Chec2. k of limit densityWhen installing an air conditioner in a room, it isnecessary to ensure that even if the refrigerant gasaccidentally escapes, its density does not exceed thelimit level.If the density might exceed the limit level, it isnecessary to set up an opening between it and theadjacent room, or to install mechanical ventilationwhich is interlocked with a leak detector.(Total refrigerant charged amount: kg)(Min. indoor volume where the indoor unit is installed: m³)< Limit density 0.3 (kg/ m3)The limit density of refrigerant which is used in thisunit is 0.3 kg/m3 (ISO 5149).The shipped outdoor unit comes charged with theamount of refrigerant fi xed for each type, so add itto the amount that is charged at the field. (For therefrigerant charge amount at shipment, refer to theunit’s nameplate.)Minimum indoor volume & fl oor area relative to theamount of refrigerant are roughly as given in thefollowing table.Pay special attention to anylocation, such as a basementor recessed area, etc. whereleaked refrigerant cancollect, since refrigerant gasis heavier than air.1013.527.040.554.067.581.094.5108121.51355101520253035404550m 3m 220 30 40 kgMin. indoor floor area(when the ceiling is 2.7 m high)Total amount of refrigerantRange belowthe density limitof 0.3 kg/m 3(countermeasuresnot needed)Range abovethe density limitof 0.3 kg/m 3(countermeasuresneeded)Min. indoor volumeCAUTIONWARNINGCAUTION
