Daikin FBQ125D_RZQSG125L9V [14/52] Guidelines when connecting the refrigerant piping
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Daikin FBQ125D_RZQSG125L9V [14/52] Guidelines when connecting the refrigerant piping

Daikin FBQ100D_RZQSG100L9V [14/52] Guidelines when connecting the refrigerant piping
6Installation
Installerreferenceguide
14
RZQG71~140L_V1+Y1+RZQSG100~140L_V1+Y1
Splitsystemairconditioners
4P3855221–2014.08
6.4.3 Guidelineswhenconnectingthe
refrigerantpiping
Takethefollowingguidelinesintoaccountwhenconnectingpipes:
▪ Coat the flare inner surface with ether oil or ester oil when
connecting a flare nut. Tighten 3 or 4 turns by hand, before
tighteningfirmly.
▪ Alwaysusetwowrenchestogetherwhenlooseningaflarenut.
▪ Alwaysuseaspannerandtorquewrenchtogethertotightenthe
flarenutwhenconnectingthepiping.Thistopreventnutcracking
andleaks.
a
b
c
d
a Torquewrench
b Spanner
c Pipingunion
d Flarenut
Pipingsize
(mm)
Tightening
torque(N•m)
Flare
dimensions(A)
(mm)
Flareshape
(mm)
Ø6.4 15~17 8.7~9.1
R=0.4~0.8
45°
±2
90°
±2
A
Ø9.5 33~39 12.8~13.2
Ø12.7 50~60 16.2~16.6
Ø15.9 63~75 19.3~19.7
Ø19.1 90~110 23.6~24.0
6.4.4 Pipebendingguidelines
Useapipebenderforbending.All pipe bends should be asgentle
aspossible(bendingradiusshouldbe30~40mmorlarger).
6.4.5 Toflarethepipeend
CAUTION
▪ Incompleteflaringmaycauserefrigerantgasleakage.
▪ Do NOT reuse flares. Use new flares to prevent
refrigerantgasleakage.
▪ Use flare nuts that are included with the unit. Using
differentflarenutsmaycauserefrigerantgasleakage.
1 Cutthepipeendwithapipecutter.
2 Removeburrswiththecutsurfacefacingdownwardsothatthe
chipsdonotenterthepipe.
a b
a Cutexactlyatrightangles.
b Removeburrs.
3 Removetheflarenutfromthe stopvalveandputtheflare nut
onthepipe.
4 Flare the pipe. Set exactly at the position as shown in the
followingillustration.
A
Conventionalflaretool
Flaretoolfor
R410A(clutch
type)
Clutchtype
(Ridgidtype)
Wingnuttype
(Imperialtype)
A 0~0.5mm 1.0~1.5mm 1.5~2.0mm
5 Checkthattheflaringisproperlymade.
a b
c
a Flare’sinnersurfacemustbeflawless.
b Thepipeendmustbeevenlyflaredinaperfectcircle.
c Makesuretheflarenutislifted.
6.4.6 Tobrazethepipeend
The indoor unit and outdoor unit have flare connections. Connect
both ends without brazing. If brazing should be needed, take the
followingintoaccount:
▪ When brazing, blow through with nitrogen to prevent creation of
large quantities of oxidised film on the inside of the piping. This
filmadverselyaffectsvalvesandcompressorsintherefrigerating
systemandpreventsproperoperation.
▪ Setthenitrogenpressureto20kPa(justenoughsoitcanbefelt
ontheskin)withapressurereducingvalve.
a b c d e
f
f
a Refrigerantpiping
b Parttobebrazed
c Taping
d Manualvalve
e Pressurereducingvalve
f Nitrogen
▪ DoNOTuseantioxidantswhenbrazingpipejoints.
Residuecanclogpipesandbreakequipment.
▪ Do NOT use flux when brazing coppertocopper refrigerant
piping. Use phosphor copper brazing filler alloy (BCuP), which
doesnotrequireflux.
Flux has an extremely harmful influence on refrigerant piping
systems.Forinstance,ifchlorinebasedfluxisused,itwillcause
pipe corrosion or, in particular, if the flux contains fluorine, it will
deterioratetherefrigerantoil.
6.4.7 Usingthestopvalveandserviceport
Tohandlethestopvalve
Takethefollowingguidelinesintoaccount:
▪ Thestopvalvesarefactoryclosed.
▪ Thefollowingillustrationshowseachpartrequiredinhandlingthe
valve.
a Serviceportandserviceportcap
b Valvestem
c Fieldpipingconnection
d Stemcap
▪ Keepbothstopvalvesopenduringoperation.

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