Daikin BS4Q14AV1 Installation Manual

Contents

10 EnglishLocation of brazingNitrogenRefrigerant pipe ValveTapingNitrogenPressure regulatorFig. 2CAUTION• Do not use an anti-oxidizing agent when brazing the piping.(Residual debris could clog the piping or cause parts to malfunction.)• For more information about outdoor unit refrigerant pipes, see the installation manual included with theoutdoor unit or the Engineering Guide.(Failure to purge air from the pipes or fill additional refrigerant may result in an insufficient volume ofrefrigerant in the pipes or other problems, causing the equipment to malfunction [for example, to not coolor heat properly].)6-3 Piping connectionLiquid pipe (*1)Suction gas pipe (*1)HP/LP gas pipe (*1)BS unit (top)Unit D Unit C Unit B Unit ALiquid pipe (*1)Gas pipe (*1)Reducing joint (*2)NotesIn case of connecting with a 20-50 type indoorunit, there is no need to cut and connect as it is.In case of others, cut the outlet pipe andconnect to the connecting pipe.In accordance with the following instructions.Cutting point(Center ofconnection area)ConnectLocal pipeConnection area(*1) Indicates local pipe.(*2) Reducing joint may be required (field supply) if the local pipe size does not suit on the pipe size of theBS unit (Table 5).If there are branch ports left unused (not connected to an indoor unit)• If there are unused branch ports, use stopper pipe (7) (accessory).If there are numerous unused branch ports, be sure to use the stop pipe kit (KHFP26A100C).Be sure to use the stop valve kit for extension (KHFP26M224, sold separately), for branch ports thatyou plan to expand in the future.6-4 Airtightness test and vacuum drying• After completing refrigerant piping work for the indoor units, BS unit, and outdoor unit, conduct an air-tightness test and vacuum drying.For more information about the airtightness test pressure, refer to the outdoor unit’s installation manual.