Daikin RXYQ72PYDN Installation Manual

Also see for RXYQ120PYDN: Operation manual Service manual

Contents

Daikin RXYQ72PYDN Installation Manual Manual pdf 9 page image

English 56. REFRIGERANT PIPINGNOTE• All field piping must be installed by a licensed refrigeration technicianand must comply with relevant local and national regulations.• After piping work is complete, do not under any circumstances openthe shutoff valve until “7. FIELD WIRING” and “10. CHECKING OFDEVICE AND INSTALLATION CONDITIONS” are complete.• Do not use flux when brazing the refrigerant piping. Use the phosphorcopper brazing filler metal (B-Cu93P-710/795 : ISO 3677) which doesnot require flux.(Flux has extremely negative effect on refrigerant piping systems. Forinstance, if the chlorine based flux is used, it will cause pipe corrosion or,in particular, if the flux contains fluorine, it will damage the refrigerant oil.)6-1 Selection of piping material and Refrigerantbranching kit• Use only pipes which are clean inside and outside and which do notaccumulate harmful sulfur, oxidants, dirt, cutting oils, moisture, orother contamination. (Foreign materials inside pipes including oilsfor fabrication must be 9 mg/10 ft or less.)• Use the following items for the refrigerant piping.Material : Jointless phosphor-deoxidized copper pipeSize : See “6-5 Example of connection” to determine the cor-rect size.Thickness : Select a thickness for the refrigerant piping whichcomplies with national and local laws.• For piping work, follow the maximum tolerated length, difference inheight, and length after a branch indicated in the “6-5 Example ofconnection”.• Outside unit multi connection piping kit and refrigerant branching kit(sold separately) are needed for connection of piping between out-side units (in case of multi system) and piping branches.Use only separately sold items selected specifically according to theoutside unit multi connection piping kit, the refrigerant branching kitselection in the “6-5 Example of connection”.6-2 Protection against contaminationwhen installing pipesProtect the piping to prevent moisture, dirt, dust, etc. from enter-ing the piping.NOTEExercise special caution to prevent dirt or dust when passing pipingthrough holes in walls and when passing pipe edges to the exterior.6-3 Pipe connection• Be sure to perform nitrogen permutation or nitrogen blow whenbrazing. (Refer to figure 8)Brazing without performing nitrogen permutation or nitrogen blowinto the piping will create large quantities of oxidized film on theinside of the pipes, adversely affecting valves and compressors inthe refrigerating system and preventing normal operation.(Refer to figure 8)1. Refrigerant pipe2. Location to be brazed3. Nitrogen4. Taping5. Handy valve6. Regulator• The pressure regulator for the nitrogen released when doing thebrazing should be set to about 2.9 psi (Enough to feel a slightbreeze on your cheek).NOTEDo not use anti-oxidants when brazing the pipe joints.Residue can clog pipes and break equipment.6-4 Connecting the refrigerant piping1. Direction to bring out the pipesThe local inter unit piping can be connected either forward or to thesides (taken out through the bottom) as shown in the figure 10.When passing out through the bottom, use the knock hole in the bot-tom frame.(Refer to figure 10)1. Left-side connection2. Front connection3. Right-side connectionPrecautions when knocking out knock holes• Open knock hole (large, small) in the base frame by drilling the 4concave around it with a 6mm bit. (Refer to figure 11)(Refer to figure 11)1. Knock hole (large : for liquid pipe, suction gas pipe and lowside equalizer pipe)2. Knock hole (small : for high side equalizer pipe)3. Drill4. Concave section (4 points)• Be sure to avoid damaging the casing.• After knocking out the holes, we recommend you to remove anyburrs and paint them using the repair paint to prevent rusting.• When passing electrical wiring through the knock holes, protect the wir-ing with a conduit or bushings, making sure not to damage the wiring.2. Removing Pinch Piping• When connecting refrigerant piping to an outside unit, remove thepinch piping using the procedure in the figure 12.(Refer to figure 12)• About handling of shutoff valves, refer to [Shutoff valve operationprocedure] in “11-1 Before working”.CAUTIONAfter removing the gass, remove the pinch piping.Any gas remaining inside may blow off the pinch piping when youdissolve the brazing, causing damage.(Refer to figure 12)1. Pich piping (4 pieces)2. Do not remove the relay piping.3. Pinch piping4. Procedure 1 : Confirm the shutoff valve is closed.5. Procedure 2 : Connect a charge hose to the service port ofshutoff valve and remove the gas in the pinch piping.6. Procedure 3 : After removing the gas in the pinch piping, dis-solve the brazing using a burner and remove the pinch piping.3. Connecting refrigerant piping to outside units• Figure 13 shows the example of connecting refrigerant piping to out-side units.• The local inter unit piping next accesorry pipes are field supplyed.• About the detail of connecting pipes between outside units on out-side unit multi system, refer to the "4. Precautions when connect-ing piping between outside units" and the installation manualattached to the outside unit multi connection piping kit.(Refer to figure 13-1)1. When connected to the front2. When connected at lateral side (bottom)3. Remove the shutoff valve cover to connect.4. Remove the knock hole on the bottom frame and route thepiping under the bottom frame.5. Liquid pipe shutoff valve6. Low side equalizer pipe shutoff valve7. Gas pipe shutoff valve8. High side equalizer pipe shutoff valve9. Brazing10. Liquid side accessory pipe (1)11. Low side equalizer accessory pipe (1)12. Gas side accessory pipe (1)Place Installation period Protection methodOutdoor More than a month Pinch the pipeLess than a month Pinch or tape the pipeIndoor Regardless of the period