Daikin R-410A Installation Manual

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Daikin R-410A Installation Manual Manual pdf 25 page image

Installation EDUS39-60524 Installation6. REFRIGERANT PIPING• After completing installation, be sure to open the valveas operating the unit with the valve shut breaks the com-pressor. See Section 6-6, Additional Refrigerant Charge,for details.• Use only R-410A from the solid pink cylinder.All field piping must be installed by a licensed refrigerationtechnician and must comply with relevant local and nationalregulations.• USE CAUTION WHEN BRAZING REFRIGERANT PIP-INGDo not use flux when brazing copper-to-copper refrigerantpiping, particularly HFC refrigerant piping. Instead usephosphor copper brazing filler metal (B-Cu93P-710/795:ISO 3677) which does not require flux.Flux has an extremely negative effect on refrigerant pipingsystems and if chlorine-based flux is used, it causes pipecorrosion. Flux containing fluorine damages refrigerantoil.• Installation tools:Make sure to use installation tools (gauge manifold chargehose, etc.) that are exclusively used for R-410A installa-tions to withstand the pressure and to prevent foreign mate-rials such as SUNISO mineral oils or moisture from mixinginto the system.Screw thread and dimension specifications for flare nuts,service valves, and charging ports are different for R-410Athan prior refrigerant types.Use a 2-stage vacuum pump with a non-return valveand makesure the pump oil does not flow back into the system while thepump is not working.• After completing installation, be sure to open the valve.Operating the unit with the valve shut breaks the compres-sor. See Section 6-6, Additional Refrigerant Charge, fordetail• WHEN BRAZING REFRIGERANT PIPING:Do not use fluxwhen brazing copper-to-copper refrigerant piping, particu-larly HFC refrigerant piping. Instead use phosphor copperbrazing filler metal (B-Cu93P-710/795: ISO 3677) whichdoes not require flux. Flux has an extremely negative effecton refrigerant piping systems and if chlorine-based flux isused, it causes pipe corrosion. Flux containing flourinedamages refrigerant oil.6-1 Selection of piping material1. Foreign materials inside pipes (including oils for fabrica-tion) must be 30mg/10m or less.2. Use the following material specification for refrigerant pip-ping:• construction material: Phosphoric acid deoxidizedseamless copper for refrigerant.• size: Determine the proper size referring to Section 6.3Example of Connection.• The wall thickness of the refrigerant piping should com-ply with relevant local and national regulations.3. Make sure to use the particular branches of piping thathave been selected referring toSection 6.3 Example ofConnection.4. Select piping material according to piping size as shown inthe following table:6-2 Connecting the Refrigerant Piping1. The local branch piping can be connected either forward, orto the sides and through the bottom as shown in the follow-ing figure:1. Left-side connection2. Front connection3. Right-side connectionOne outdoor unit installedRefer to Figure.When multiple outdoor units are installed, an optionalmulti-piping kit is required to connect piping between units.Follow the installation manual’s instructions accompanyingthe kit.• Front connection:Remove the stop valve cover to connect.Refer to Figure 6.• Side (bottom) connection:Remove the knockout holes on the bottom frame and routethe piping under the bottom frame.Refer to Figure 6.1. Front connection2. Remove the stop valve cover to connect.3. Flange4. Gas side accessory pipe (1) (2) (3)5. Oil-equalizing piping stop valve6. No piping work is needed.7. Flare nut8. Brazing9. Liquid side piping (field supply)10. Side (bottom) connection11. Remove the knockout holes on the bottom frameand route the piping under the bottom frame.12. Knockout hole13. Punch the knockout holes.14. Gas side piping (field supply)15. Oil-equalizing piping (field supply)NOTEBe sure to use the attached pipe when carrying out pipingwork in the field.Be sure that the local piping does not touch other pipes,the bottom panel or side panel. Especially for the bottomand side connection, be sure to protect the local pipingPiping Size (O/D) Temper grade of Materialφ15.9 or less Oφ19.1 or more 1/2 H or H1 2 3