Daikin FDQ125C_RZQG125L9V [9/52] Preparation
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Daikin FDQ125C_RZQG125L9V [9/52] Preparation

Daikin FBQ125D_RZQSG125L9V [9/52] Preparation
5Preparation
Installerreferenceguide
9
RZQG71~140L_V1+Y1+RZQSG100~140L_V1+Y1
Splitsystemairconditioners
4P3855221–2014.08
5.3.2 Refrigerantpipingrequirements
INFORMATION
Also read the precautions and requirements in the
"Generalsafetyprecautions"chapter.
Whenconnectingmultipleindoorunitstotheoutdoorunit,mindthe
following:
Refrigerantbranchkit Oneormorerefrigerantbranchkitsare
required.See"4.3.1Possibleoptionsforthe
outdoorunit"onpage7.
Upwardand
downwardpiping
Performupwardanddownwardpipingonly
onthemainpipingline(L1).
Branchpipes ▪ Installthebranchpipeshorizontally(witha
maximuminclinationof15°)orvertically.
▪ Makethelengthofthebranchpipestothe
indoorunitsasshortaspossible.
▪ Try to keep length of the branch pipes to
theindoorunitsequal.
Definitions:L1~L7,H1,H2
Pair
(a)
H1
L1
Twin
(a)
H1
H2
L1
L2
L3
Triple
(a)
L2
L3
L4
H1
H2
L1
Doubletwin
(a)
H1
H2
L1
L2
L3
L4
L5
L6
L7
(a) Assumethatthelongestlineintheillustrationcorresponds
withtheactuallongestpipe,andthehighestunitinthe
illustrationcorrespondswiththeactualhighestunit.
L1 Mainpiping
L2~L7 Branchpiping
H1 Heightdifferencebetweenthehighestindoorunitandthe
outdoorunit
H2 Heightdifferencebetweenthehighestandthelowest
indoorunit
Refrigerantbranchkit
Refrigerantpipingmaterial
▪ Pipingmaterial:Phosphoricaciddeoxidisedseamlesscopper.
▪ Pipingtempergradeandthickness:
Outerdiameter
(Ø)
Tempergrade Thickness(t)
(a)
6.4mm(1/4")
9.5mm(3/8")
12.7mm(1/2")
Annealed ≥0.8mm
t
Ø
15.9mm(5/8") Annealed ≥1.0mm
19.1mm(3/4") Halfhard
(a) Dependingontheapplicablelegislationandtheunit's
maximumworkingpressure(see"PSHigh"ontheunit
nameplate),largerpipingthicknessmightberequired.
▪ Flareconnections:Onlyuseannealedmaterial.
Refrigerantpipingdiameter
Therefrigerantpipingdiametersmustcomplywiththefollowing:
Piping Diameter
L1(pair,twin,triple,doubletwin) Seebelow.
L2,L3(twin)
L2~L4(triple)
L4~L7(doubletwin)
Usethesamediametersasthe
connections(liquid,gas)onthe
indoorunits.
L2,L3(doubletwin) Liquidpiping:Ø9.5mm
Gaspiping:Ø15.9mm
L1(pair,twin,triple,doubletwin):
Model New
(a)
/
Existing
(b)
L1liquid
piping
L1gaspiping
RZQG71 Sizedown Ø6.4mm Ø12.7mm
Standard Ø9.5mm Ø15.9mm
Sizeup Ø12.7mm —
RZQG100~140
RZQSG100~140
Sizedown Ø6.4mm —
Standard Ø9.5mm Ø15.9mm
Sizeup Ø12.7mm Ø19.1mm
(a) Wheninstallingnewpiping,usethesamediametersas
theconnectionsontheoutdoorunits(i.e.standard
diametersforliquidandgaspiping).
(b) Whenreusingexistingpiping,youmayusethesizeupor
sizedowndiameters,butthencapacitymightdecrease,
andstricterpipinglengthrequirementsareapplicable.
Assesstheselimitationsinrelationtothecomplete
installation.

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