Daikin BS4Q14AV1 Installation Manual

Contents

English 9• Table 5 lists BS unit connection pipe size.Table 5 BS unit connection pipe size Unit: mmBS unit Outdoor unit side (*1) Indoor unit side (*2)Suction pipe HP/LP gas pipe Liquid pipe Gas pipe Liquid pipeBS4Q14AV1 ϕ22.2 (ϕ19.1) ϕ19.1 (ϕ15.9) ϕ9.5ϕ12.7 (ϕ15.9) ϕ6.4 (ϕ9.5)BS6Q14AV1 ϕ28.6 ϕ19.1 (ϕ22.2) ϕ12.7BS8Q14AV1 ϕ19.1 (ϕ22.2, ϕ28.6) ϕ12.7 (ϕ15.9)BS10Q14AV1 ϕ28.6 (ϕ34.9) ϕ28.6ϕ15.9BS12Q14AV1 ϕ15.9 (ϕ19.1)BS16Q14AV1 ϕ34.9 ϕ19.1*1 Figures in parentheses indicate the size of the accessory pipes. If the pipe size differs from that of thesize selected from Table 3, you will need a reducing joint (to be supplied in the field).*2 The pipe diameter in parentheses can be used by cutting the pipes on the BS unit side with a pipe cut-ter. For details, refer to “6-3 Piping connection.”NOTES• If the number of indoor units to be connected is less than the number of branch ports (so that there areempty branch ports left, or if you plan to increase the number in the future), any of the branch ports canbe left open.• If you plan to add new indoor units in the future, select a pipe size based on the total indoor unit capacitybefore addition of new units.• Be sure to use the stop valve kit for extension (KHFP26M224, sold separately) for pipe that you plan toexpand in the future. Do not size pipe based on anticipated future expansion. Instead, reexamine the pipesize when you expand the system.Failure to use the stop valve kit for extension will force you to recover the refrigerant before connectingany new indoor units.• For more information about how to install the stop valve kit for extension, refer to the installation manualincluded with the stop valve kit for extension.6-2 Pipe connection work precautionsConnect the pipes.• Braze (*2) refrigerant pipes after nitrogen replacement (replacing air and nitrogen while allowing nitrogento flow inside the refrigerant pipe (*1). (Refer to Fig. 2))(*1) The pressure regulator for the nitrogen released when doing the brazing should be set to about 0.02MPa (enough to feel a slight breeze on your cheek).(*2) Do not use flux when brazing the refrigerant pipe.Use phosphor copper (BCuP-2: JIS Z 3264/B-Cu93P-710/795: ISO 3677), which does not requireflux, as the filler metal for brazing.(Using chlorine flux may cause the pipes to corrode, and if it contains fluoride it may cause the refrig-erant lubricant to degrade, adversely affecting the refrigerant piping system.)