14Refrigerant pipe installationSelecting Y-jointXX Select the first Y-joint according to main pipe size of each outdoor unit capacityXX Select the other Y-joints according to the total indoor unit capacity under the selected Y-jointSelecting the first Y-joint Other Y-jointsOutdoor unit capacity[HP(Ton)] Y-joint model Total indoor unit capacity under theselected Y-joint [kW (Btu/h)] Y-joint model4(3) MXJ-YA1509✴ X ≤ 15 0 (51000) MXJ-YA1509✴5(4) MXJ-YA1509✴ 15 0 (51000) < X ≤ 40 6 (138000) MXJ-YA2512✴6(5) MXJ-YA2512✴Keeping refrigerant pipeTo prevent foreign materials or water from entering the pipe, it is important to keep the refrigerant pipe clean and dry and toseal it during installationApply correct sealing method depending on the environmentExposure place Exposure time Sealing typeOutside exposure Longer than one month Pipe pinchShorter than one month TapingInside exposure - TapingRefrigerant pipe brazing and safety informationImportant information for refrigerant pipe workXX Make sure that there is no moisture inside the pipeXX Make sure that there are no foreign materials and impurities in the pipeXX Make sure that there is no leakXX Make sure to follow the instruction when brazing and keeping the pipeNitrogen flushing brazingXX Use Nitrogen gas when brazing the pipes as shown in the pictureXX If you do not perform nitrogen flushing when brazing the pipes, oxide may form inside the pipe It can cause the damageof the important parts such as compressor, valvesXX Adjust the flow rate of the Nitrogen flushing with a pressure regulator to maintain 0 05m3/h or lessBrazing partNitrogen gasØ6 35(1/4") copper pipeShut-offvalveTapingFlow meterHigh pressure hosePressure regulatorAM0@@FXMDCH_IM_EN_03408A(1).indd 14 2013-03-04 오후 4:28:16