Daikin RZQ24TAVJU Installation Manual

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Contents

Daikin RZQ24TAVJU Installation Manual Manual pdf 10 page image

6 English6. REFRIGERANT PIPINGCAUTION• Do not allow anything other than the designated refrigerant to getmixed into the refrigerant cycle, such as air, nitrogen, etc. If anyrefrigerant gas leaks while working on the unit, ventilate the roomthoroughly right away.• Use R410A only when adding refrigerant.6-1 Installation toolsMake sure to use speciality tools to withstand the pressure and to pre-vent foreign materials from mixing into the system.6-2 Selecting piping materialCAUTIONPiping and other pressure containing parts shall comply with theapplicable legislation and shall be suitable for refrigerant. Use phos-phoric acid deoxidized seamless copper for refrigerant.CAUTION• 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 circumstancesopen the stop valve until 7. ELECTRIC WIRING on page 8 and9. POST-WORK CHECKS on page 11 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 fluxis used, it will cause pipe corrosion or, in particular, if the flux con-tains fluorine, 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.Thickness: Select a thickness for the refrigerant piping which com-plies with national and local laws.• Maximum piping length and height difference between the outdoorand indoor units.6-3 Protection against contamination when install-ing pipes• Cover the ends of pipe to prevent moisture, dirt, dust, etc. from enter-ing the piping.• Exercise caution when passing copper piping through the through-holes and when passing them out to the outside.6-4 Pipe connection• See “Stop valve operation procedure” in “6-7 Air tight test and vac-uum drying” regarding handling of the stop valve.• Only use the flare nuts included with the unit. Using different flarenuts may cause the refrigerant to leak.• Be sure to perform a nitrogen blow when brazing.(Brazing without performing nitrogen replacement or releasing nitro-gen into the piping will create large quantities of oxidized film on theinside of the pipes, adversely affecting valves and compressors in therefrigerating system and preventing normal operation.)(Refer to figure 15)1. Refrigerant pipe2. Location to be brazed3. Regulator4. Nitrogen5. Manual valve6. Taping6-5 Connecting the refrigerant piping• Connection to larger pipe sizes.In certain configurations this system is designed to be connected tolarger diameter pipe sizes than the standard factory service valves.If the installation requires use of larger pipe diameters, a field settingchange is required for the system to operate smoothly.• The local field piping is connectable in four directions.(Refer to figure 16)1. Front panel2. Pipe outlet panel3. Backward4. Sideways5. Downward6. Pipe outlet panel screw7. Forward8. Screw for front panel• When connecting the pipings downward, remove the knockoutby making four holes in the middle on the each side of theknockout with a drill.(Refer to figure 17)1. Drill2. Center area around knockout3. Knockout4. SlitGaugemanifoldCharge hose• Make sure to use installation tools that are exclu-sively made for R410A installations to withstandthe pressure and to prevent foreign materials (e.g.mineral oils such as SUNISO and moisture) frommixing into the system.Vacuum pump• Use a 2-stage vacuum pump with a non-returnvalve.• Make sure the pump oil does not flow backwardinto the system while the pump is not working.• Use a vacuum pump which can evacuate to500 microns.Model 18·24 type 30~48 typeMaximum piping length 164 ft. (50 m) 230 ft. (70 m)Maximum heightdifference98 ft. (30 m) (outdoor unit above indoor unit)98 ft. (30 m) (outdoor unit below indoor unit)Place Installation Protection methodMore than a month Pinch the pipeLess than a monthPinch or tape the pipeRegardless of the period