Daikin FDQ125C_RZQG125L9V [8/52] Preparing refrigerant piping
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Daikin FDQ125C_RZQG125L9V [8/52] Preparing refrigerant piping

Daikin FBQ125D_RZQSG125L9V [8/52] Preparing refrigerant piping
5Preparation
Installerreferenceguide
8
RZQG71~140L_V1+Y1+RZQSG100~140L_V1+Y1
Splitsystemairconditioners
4P3855221–2014.08
a
b
c
b
a Baffleplate
b Prevailingwinddirection
c Airoutlet
5.2.2 Additionalinstallationsiterequirements
oftheoutdoorunitincoldclimates
Protecttheoutdoorunitagainstdirectsnowfallandtakecarethatthe
outdoorunitisNEVERsnowedup.
a
b
c
c
d
a Snowcoverorshed
b Pedestal(minimumheight=150mm)
c Prevailingwinddirection
d Airoutlet
5.3 Preparingrefrigerantpiping
5.3.1 Aboutreusingexistingpiping
Insomecasesyoumayreuseexistingpiping,inothercasesnot.
Reusenotallowed
Youmaynotreuseexistingpipinginthefollowingcases:
▪ When the compressor in the old installation had problems
(example:breakdown).Possibleconsequence:oxidisedcoolant
oil,scaleresidueandotheradverseeffects.
▪ When the indoor and outdoor units were disconnected from the
pipingfor along time.Possible consequence:water anddirt in
thepiping.
▪ Whenthecopperpipingiscorroded.
Reuseallowed
Inother casesthanabove,youmay reuseexisting pipingbutkeep
thefollowinginmind:
Item Description
Pipingdiameter Mustcomplywithrequirements.See
"5.3.2Refrigerantpipingrequirements"on
page9.
Pipingmaterial
Pipinglengthand
heightdifference
Pipinginsulation Ifdeteriorated,mustbereplaced.
Mustcomplywithrequirements.See
"5.3.3Refrigerantpipinginsulation"on
page11.
Flareconnections Maynotbereused.Makenewonesto
preventleaks.See"6.4.3Guidelineswhen
connectingtherefrigerantpiping"onpage
14and"6.4.5Toflarethepipeend"on
page14.
Weldedconnections Mustbecheckedforgasleaks.
Cleaningpipes Ifthefollowingconditionsaremet,youdo
nothavetocleanthepipes.Otherwise,you
mustcleanthepipes,orinstallnewones.
Conditions:
▪ Thetotalonewaypipinglengthis<50m.
Thismeans:
▪ Pair:L1<50m
▪ Twinandtriple:L1+L2<50m
▪ Doubletwin:L1+L2+L4<50m
▪ You pumped down the old system
correctly.Thismeans:
▪ Operated the unit continuously for
30minutesincoolingmode.
▪ Pumpeddownthesystem.
▪ Removedtheoldunits.
▪ Pipingisnotcontaminated(seebelow).
Tocheckifpipingiscontaminated
You must check if existing piping is contaminated because using
pipingwithdeterioratedoilwillcausecompressorbreakdown.
Prerequisite: You need an oil checking reference card. This is
availablefromyourdealer.
1 Putsomeresidualoilfromthepipingonapieceofwhitepaper.
2 Comparethecolours:
Iftheoilcolouris… Then…
Identicaltoordarkerthanthe
circledcolouronthereference
card
Youmustcleantheexisting
piping,orinstallnewpiping.
Lighterthanthecircledcolour
onthereferencecard
Youcanreusethepiping
withoutcleaning.

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