1-231This unit requires no additional refrigerant charge up to tubing length 30 m. In caseof more than 30 m, additional refrigerant charge is required. Refer to Table 1-1.In case of multi type installation, indoor units should be installed within the sameroom. If multi type indoor units are installed in different rooms, temperature controlmay develop problems because thermostat operation must follow the thermostatcondition of 1 indoor unit only (the main unit).1.2.Always check the gas densityfor the room in which the unit isinstalled.Check of limit density2.When installing an air conditioner in a room, it isnecessary to ensure that even if the refrigerantgas accidentally escapes, its density does notexceed the limit 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/m 3 (ISO 5149).The shipped outdoor unit comes charged with theamount of refrigerant fixed 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 & floor 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.CAUTIONWARNINGCAUTION40.554.027.013.50.0 20100 30 40 60 70 80 90 1005067.581.094.5108.0121.5135.0148.5162.0175.5189.0202.5216.0229.5243.0256.0270.0m 2 m 315105020253035404550556065707580859095100105110115120125283.5297.0310.5324.0337.5kgRange below thedensity limit of0.3 kg/m³(Countermeasuresnot needed)Range above thedensity limit of 0.3kg/m³(Countermeasuresneeded)Total amount of refrigerantMin. indoor volumeMin. indoor floor area(when the ceiling is 2.7 m high)
