Daikin VRV RXYQ72XBYC Series Installation Manual

Also see for VRV RXYQ120XBYC Series: Operation manual

9English6.6. Method for opening the sliding plateThe sliding plate should be moved to the open position in the followingregions to minimize temperature rise in the main control box: CA,NV, AZ, NM, OK, TX, AR, LA, MS, AL, TN, GA, NC, SC, FL and LatinAmerica.1 Remove the left screw (1 pc.) and loosen the right screw (1 pc.).SLIDING PLATE SCREW2 Move the sliding plate to the right and set the arrow to “OPEN”.3 Reinstall the left screw and tighten both the left and right screws.NOTEFailure to follow the above instructions could lead to premature com-ponent failure.7. Refrigerant pipe size and allowable pipe length7.1. General informationNOTEThe refrigerant R410A requires strict cautions for keeping the systemclean, dry and tight.• Clean and dry: foreign materials (including mineral oils or moisture)should be prevented from getting mixed into the system.• Tight: R410A does not contain any chlorine, does not destroythe ozone layer, and does not reduce earth’s protection againstharmful ultraviolet radiation. R410A can contribute slightly to thegreenhouse effect if it is released. Therefore we should take specialattention to check the tightness of the installation.7.2. Selection of piping materialNOTEPiping and other pressure containing parts shall comply with the appli-cable legislation and shall be suitable for refrigerant. Use phosphoricacid deoxidized seamless copper for refrigerant.NOTE• All field piping must be installed by a licensed refrigeration techni-cian and must comply with relevant local and national regulations.• After piping work is complete, do not under any circumstances openthe stop valve until 9. Field wiring on page 18 and 12. Checking ofdevice and installation conditions on page 24 are complete.• Do not use flux when brazing the refrigerant piping. Use the phos-phor copper brazing filler metal (B-Cu93P-710/795 : ISO 3677)which does not require flux. Flux has extremely negative effect onrefrigerant piping systems. For instance, if the chlorine based flux isused, it will cause pipe corrosion or, in particular, if the flux containsfluorine, it will damage the refrigerant oil.• 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 0.14 gr/10 ft. (30 mg/10 m) or less.)• Use the following items for the refrigerant piping.Material : Jointless phosphor-deoxidized copper pipe.Size : See 7.3. Selection of piping size to determine the correctsize.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 7.5. System piping(length) limitations on page 11.• Outdoor unit multi connection piping kit and refrigerant branch kit(sold separately) are needed for connection of piping betweenoutdoor units (in case of multi system) and piping branches.• Use only separately sold items selected specifically according tothe outdoor unit multi connection piping kit, the refrigerant branch kitselection in the 7.4. Selection of refrigerant branch kits on page 11.