Daikin RZQG71L8V1B Installation Manual

Daikin RZQG71L8V1B Installation Manual Manual pdf 12 page image

Installation manual9 RZQG71~140L + RZQSG100~140LSplit system air conditioners4P339538-1A – 2014.039. Precautions on refrigerant piping Do not allow anything other than the designated refrigerant toget mixed into the freezing cycle, such as air, etc. If anyrefrigerant gas leaks while working on the unit, ventilate theroom thoroughly right away. Use R410A only when adding refrigerantInstallation tools:Make sure to use installation tools (gauge manifold, chargehose, etc.) that are exclusively used for R410A installations towithstand the pressure and to prevent foreign materials (e.g.mineral oils and moisture) from mixing into the system.Vacuum pump:Use a 2-stage vacuum pump with a non-return valveMake sure the pump oil does not flow oppositely into the systemwhile the pump is not working.Use a vacuum pump which can evacuate to –100.7 kPa (5 Torr,–755 mm Hg). During tests never pressurize the appliances with a pressurehigher than the maximum allowable pressure (see unit nameplate: PS). In order to prevent dirt, liquid or dust from entering the piping,cure the piping with a pinch or taping.Great caution is needed when passing copper tubes throughwalls. Piping should be mounted so that the flare is not subjected tomechanical stress. In case of simultaneous operating system- Upward and downward piping should be performed at themain piping line.- Use branch piping kit (optional) for branching refrigerantpipes.Precautions to be taken. (For details, refer to the manual attached tobranch piping kit.)- Install the branch pipes horizontally (with a maximuminclination of 15°) or vertically.- Length of branch pipe to the indoor unit should be as short aspossible.- Try to keep lengths of both branch pipes to the indoor unitequal. When using existing refrigerant pipingPay attention to the following points when using existingrefrigerant piping Perform a visual check on quality of residual oil in existingrefrigerant piping.This check is extremely important because using existingpiping with deteriorated oil will cause compressorbreakdown.- Put some residual oil of the pipes you want to reuse on apiece of white paper or on the white surface of an oilchecking reference card and compare that oil colour withthe circled colour of the oil checking reference card.- If oil colour is identical to the circled colour or darker,replace the piping, install new piping or clean the pipingthoroughly.- If oil colour is lighter, the pipes can be reused withoutcleaning.An oil checking reference card is indispensable for suchevaluation and can be obtained at your dealer. In the following situations, the existing piping should not bere-used and new piping should be installed.- If the previously used model had problems with itscompressor (this might cause oxidised coolant oil, scaleresidue and other adverse effects).- If the indoor or outdoor units were disconnected from thepiping for a long period of time (water or dirt might havegotten into the piping).- If copper piping is corroded. Flares should not be re-used but rather new ones made inorder to prevent leaks. Check welded connections for gas leaks, if the local pipinghas welded connections. Replace deteriorated insulation with new material.9.1. Flaring guidelines Flares should not be re-used. New ones should be made inorder to prevent leaks. Use a pipe cutter and flare tool suitable for the refrigerant used. Only use the flare nuts included with the unit. Using differentflare nuts may cause the refrigerant to leak. Please refer to the table for flaring dimensions and tighteningtorques (too much tightening will result in splitting the flare). When connecting the flare nut, coat the flare inner surface withether oil or with ester oil and initially tighten 3 or 4 turns by handbefore tightening firmly.Place Installation period Protection methodOutdoor unit More than a month Pinch the pipeLess than a monthPinch or tape the pipeIndoor unit Regardless of theperiodPiping size(mm)Tighteningtorque (N•m)Flare dimensions A(mm)Flare shape(mm)Ø6.4 15~17 8.7~9.1Ø9.5 33~39 12.8~13.2Ø12.7 50~60 16.2~16.6Ø15.9 63~75 19.3~19.7Ø19.1 90~110 23.6~24.0A90 245 2R=0.4~0.8