Daikin FAQ71CVEB Installation Manual

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Daikin FAQ71CVEB Installation Manual Manual pdf 13 page image

12 EnglishNOTE1. For the nitrogen exchange procedures, please refer to the Multi-split Type Series for Building installationmanual (contact your Daikin dealer).2. When brazing after having nitrogen flow through the pipe and substituting nitrogen for air, it is appropriateto set the nitrogen pressure to about 0.02MPa with a pressure reducing valve. (Refer to Fig. 16)3. Do not use flux when brazing refrigerant piping. Use the phosphor copper brazing filler metal (BCuP-2: JISZ 3264/B-Cu93P-710/795: ISO 3677) that does not require flux.(Chlorine based flux is extremely harmful to refrigerant piping systems. It will corrode the refrigerant pipingand if it contains fluorine it will deteriorate the refrigerating oil.4. When performing the leakage test for the indoor unit and inter-unit piping after the indoor unit is installed,be sure to refer to the installation manual for the indoor unit or technical guide for the leakage test pressureand the refrigerant piping installation.5. Shortage of refrigerant due to air purge or forgetting the additional refrigerant charge may cause malfunc-tion of the unit (does not sufficiently cool or heat).For installation of refrigerant piping, be sure to refer to the installation manual for the outdoor unit or thetechnical guide.CAUTION• Do not use oxidation inhibitors or the like when brazing. (Residues may cause clogging of pipes or damageto parts.)7. DRAIN PIPING WORK(1) Install the drain piping. (Refer to Fig. 17)Perform the drain piping work so that water drains properly.• The drain piping should be short with a downward slope of 1/100 or more, and should prevent air pock-ets from forming. The drain hose which is indoor units should also have a downward slope.CAUTION• The drain pipe may be clogged if water accumulates in the drain pipe.• Watch out for the points in the Fig. 17 when performing drain work.Refrigerant pipingPart to bebrazedTapingPressure-reducing valvehands valveNitrogen Fig. 16NitrogenFig. 17Make sure the drainpipe is at a downwardslope.Make sure the tip doesnot go underwater evenwhen water is added.Drain hose Drain hose(Downwardslope)