Trust X Series User manual

TRUST AIR CONDITIONING EQUIPMENT CO.
Prepared By: Engineering & R & D Department.
Shiraz- May 2017
(X SERIES)
INVERTER VRF SYSTEM

1
Installation
1Preface.................................................................................................2
2UnitPlacementandInstallation............................................................3
3OutdoorUnitDuctingandShielding......................................................6
4RefrigerantPipingDesign
6DrainPiping........................................................................................33
7Insulation...........................................................................................36
8ChargingRefrigerant...........................................................................39
9ElectricalWiring..................................................................................41
10 InstallationinAreasofHighSalinity....................................................45
11 Commissioning...................................................................................46
12 Appendix–SystemCommissioningReport...........................................49
2016
14 Centralized Controllers .................................................................55
15 Network Control System and Building Management Systems........55
13Individual Controllers ...................................................................55
..................................................................10
5RefrigerantPipingInstallation...........................................................11

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2
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1 Preface
1.1 NotesforInstallersBoxes
TheinformationcontainedinthisEngineeringDataBookmayprimarilybeofuseduringthesystemdesignstageofaTrust
V5XSeriesVRFproject.Additionalimportantinformationwhichmayprimarilybeofuseduringfieldinstallationhasbeen
placedinboxes,suchastheexamplebelow,titled“Notesforinstallers”.


1.2 Definitions
InthisEngineeringDataBook,theterm“applicablelegislation”referstoallnational,localandotherlaws,standards,codes,
rules,regulationsandotherlegislationthatapplyinagivensituation.

1.3 Precautions
Allsysteminstallationincludinginstallationofpipingandelectricalworksmustonlybecarriedoutbycompetentand
suitablyqualified,certifiedandaccreditedprofessionalsandinaccordancewithallapplicablelegislation.

Notesforinstallersboxescontainimportantinformationwhichmayprimarilybeofuseduringfieldinstallation,
ratherthanduringdesk‐basedsystemdesign.
Notesforinstallers


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3
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2 UnitPlacementandInstallation
2.1 OutdoorUnits
2.1.1 Placementconsiderations
Placementofoutdoorunitsshouldtakeaccountofthefollowingconsiderations:
Airconditionersshouldnotbeexposedtodirectradiationfromahigh‐temperatureheatsource.
Airconditionersshouldnotbeinstalledinpositionswheredustordirtmayaffectheatexchangers.
Airconditionersshouldnotbeinstalledinlocationswhereexposuretooilortocorrosiveorharmfulgases,suchas
acidicoralkalinegases,mayoccur.
Airconditionersshouldnotbeinstalledinlocationswhereexposuretosalinitymayoccurunlesstheanti‐corrosion
treatmentforhigh‐salinityareascustomizationoptionhasbeenaddedandtheprecautionsdescribedinInstallation
Manual,10“InstallationinAreasofHighSalinity”aretaken.
Outdoorunitsshouldbeinstalledinwell‐drained,well‐ventilatedpositionsthatareascloseaspossibletotheindoor
units.

2.1.2 Spacing
Outdoorunitsmustbespacedsuchthatsufficientairmayflowthrougheachunit.Sufficientairflowacrossheat
exchangersisessentialforoutdoorunitstofunctionproperly.Figures3‐2.1to3‐2.3showspacingrequirementsinthree
differentscenarios.

IftheparticularcircumstancesofaninstallationrequireaunittobeplacedclosertoawallthanspecifiedinFigures3‐2.1
to3‐2.3,adischargeductshouldbeinstalled.RefertoInstallationManual,3“OutdoorUnitDuctingandShielding”.
Dependingontheheightofadjacentwallsrelativetotheheightoftheunits,ductingmayberequired.RefertoInstallation
Manual,3“OutdoorUnitDuctingandShielding”.

Figure3‐2.1:Singleunitinstallation(unit:mm)Figure3‐2.2:Singlerowinstallation(unit:mm)


Figure3‐2.3:Multi‐rowinstallation(unit:mm)

Front1000 or more
1000 or more
1000 or more
1000 or more
100 to 500 100 to 500
1000 or more
1000 or more
1000 or more 1000 or more
Front
100 to 500
100 to 500
100 to 500
100 to 500
100 to 500
100 to 500
1000 or more
1000 or more
1000 or more
1000 or more
1000 or more
1000 or more
1000 or more
1000 or more
1000 or mor
e
1000 or mor
e
Front
Front
Front

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4
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2.1.3 Masterandslaveunitpositioning
Insystemswithmultipleoutdoorunits,theunitsshouldbeplacedinorderfromlargestcapacityunittosmallestcapacity
unit.Thelargestcapacityunitmustbeplacedonthefirstbranch,andbesetasthemasterunit,whiletheothersshouldbe
setasslaveunits.RefertotheV5XServiceManual,ControlManualfordetailsofhowtosetunitsasmaster/slave.

TheexampleinFigure3‐2.4illustratestheplacingofunitsina48HPcombination:
Placethe22HPunitonthefirstbranchandsetitasthemasterunit.
Placethe16HPand10HPunitsonthenextbranchesandsetthemasslaveunits.

Figure3‐2.4:Positioningofmasterandslaveunits
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2.1.4 Basestructures
Outdoorunitbasestructuredesignshouldtakeaccountofthefollowingconsiderations:
Asolidbasepreventsexcessvibrationandnoise.Outdoorunitbasesshouldbeconstructedonsolidgroundoron
structuresofsufficientstrengthtosupporttheunits’weight.
Basesshouldbeatleast200mmhightoprovidesufficientaccessforinstallationofpiping.
Eithersteelorconcretebasesmaybesuitable.
AtypicalconcretebasedesignisshowninFigure3‐2.5.Atypicalconcretespecificationis1partcement,2partssand
and4partscrushedstonewithΦ10mmsteelreinforcingbar.Theedgesofthebaseshouldbechamfered.
Toensurethatallcontactpointsareequallysecure,basesshouldbecompletelylevel.Basedesignshouldensurethat
thepointsontheunits’basesdesignedforweight‐bearingsupportarefullysupported.Boltspacingsshouldbeasper
Figure3‐2.6andTable3‐2.1.
Adrainageditchshouldbeprovidedtoallowdrainageofcondensatethatmayformontheheatexchangerswhen
theunitsarerunninginheatingmode.Thedrainageshouldensurethatcondensateisdirectedawayfromroadways
andfootpaths,especiallyinlocationswheretheclimateissuchthatcondensatemayfreeze.

Outdoorunits
(48HP)
A(22HP) B(16HP) C(10HP)
Indoor
unitA
Indoor
unitB
Indoor
unitC
Firstoutdoor
branchjoint

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5
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Figure3‐2.5:Outdoorunittypicalconcretebasestructuredesign(unit:mm)
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
Figure3‐2.6:ExpansionboltpositioningTab le3‐2.1:Expansionboltspacings
Dimension(mm)8,10,12HP14,16,18,20,22HP
A7401090
B9901340
C723723
D790790
  
2.1.5 Acceptanceandunpacking
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
2.1.6 Hoisting



≥80
Outdoorunit
Concretebaseh=200
Φ10Expansionbolt
Rubberanti‐vibrationpads
Solidground/surface
200
15×23 long u-shape hole
B
A
C
D
Whenunitsaredeliveredcheckwhetheranydamageoccurredduringshipment.Ifthereisdamagetothe
surfaceoroutsideofaunit,submitawrittenreporttotheshippingcompany.
Checkthatthemodel,specificationsandquantityoftheunitsdeliveredareasordered.
Checkthatallaccessoriesorderedhavebeenincluded.RetaintheOwner'sManualforfuturereference.
Notes
f
orinstallers

Donotremoveanypackagingbeforehoisting.Ifunitsarenotpackagedorifthepackagingisdamaged,use
suitableboardsorpackingmaterialtoprotecttheunits.
Hoistoneunitatatime,usingtworopestoensurestability.
Keepunitsuprightduringhoisting,ensuringthattheangletotheverticaldoesnotexceed30°.
Notesforinstallers

Rubberanti‐vibrationpads

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6
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2.2 IndoorUnits
2.2.1 Placementconsiderations
Placementofindoorunitsshouldtakeaccountofthefollowingconsiderations:
Sufficientspacefordrainpipingandforaccessduringservicingandmaintenanceshouldbeallowed.
Toensureagoodcooling/heatingeffect,short‐circuitventilation(whereoutletairreturnsquicklytoaunit’sairinlet)
shouldbeavoided.
Topreventexcessivenoiseorvibrationduringoperation,suspensionrodsorotherweight‐bearingfixingsshould
typicallybeabletobeartwicetheunit’sweight.
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3 OutdoorUnitDuctingandShielding
3.1 DuctingRequirements
Dependingontheheightofadjacentwallsrelativetotheheightoftheunits,ductingmayberequiredtoensureproperair
discharge.InthesituationdepictedinFigure3‐3.1,theverticalsectionofductingshouldbeatleastH‐hhigh.

Figure3‐3.1:Top ofunitbelowtopofadjacentwall

3.2 DesignConsiderations
Outdoorunitductingdesignshouldtakeaccountofthefollowing:
Eachductshouldcontainnomorethanonebend.
Vibrationisolationshouldbeaddedtotheconnectionbetweentheunitandtheductingtoavoidvibration/noise.
Installinglouversisnotrecommendedasdoingsodecreasesairflow,impactinguponcooling/heatingperformance
andenergyefficiency.Iftheinstallationsituationnecessitateslouvers,theyshouldbeinstalledatananglenogreater
than15°tothehorizontal,tominimizetheimpactonairflow.

hh-H
H
Beforeinstallinganindoorunit,checkthatthemodeltobeinstalledisasspecifiedintheconstructiondrawings
andconfirmthecorrectorientationoftheunit.
Ensurethatunitsareinstalledatthecorrectheight.
Toallowsmoothcondensatedrainageandtoensureunitstability(topreventexcessivenoiseorvibration),
ensurethatunitsareleveltowithin1°ofthehorizontal.Ifaunitisnotleveltowithin1°ofthehorizontal,water
leakageorabnormalvibration/noisemayoccur.
Notesforinstallers


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7
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3.3 Ductingfor8HP,10HPand12HPUnits
3.3.1 OptionA–Transverseducting
Figure3‐3.2:Transverseductingfor8HP,10HPand12HPunits(unit:mm)


Table3‐3.1:Ductdimensions  
Dimensions(mm)Table3‐3.2:Externalstaticpressure
AA≥300ESP(Pa)Remarks
BB≥2500Factorydefault
CC≤3000
0–20Removesteelmeshand
connecttoduct<3mlong

D731≤D≤770
EE=A+731>20Customizationoption
θ Θ≤15°  

3.3.2 OptionB–Longitudinalducting
Figure3‐3.3:Longitudinalductingfor8HP,10HPand12HPunits(unit:mm)




Table3‐3.3:Ductdimensions   
Dimensions(mm) Tab le3‐3.4:Externalstaticpressure
AA≥300ESP(Pa)Remarks
BB≥250
0Factorydefault
CC≤3000
0–20Removesteelmeshand
connecttoduct<3mlong

DD=A+750 
θ Θ≤15°
>20Customizationoption
  
750
Support
Radius
Radius
Airoutletlouver(optional)
731
A
C
D
B
90
100
θ
E
750
340
320
704
8×φ3.3
731
Support
Radius
Radius
Airoutletlouver(optional)
750
A
C
B
90
100
θ
D
770
750
340
320
704
8×φ3.3
8×ST3.9self‐
threadingscrews
Removethe
steelmeshfirst
8×ST3.9self‐
threadingscrews
Removethe
steelmeshfirst


8

3.4 Ductingfor14HP,16HP,18HP,20HPand22HPUnits
3.4.1 OptionA–Transverseducting
Figure3‐3.4:Transverseductingfor14HP,16HP,18HP,20HPand22HPunits(unit:mm))


Table3‐3.5:Ductdimensions  
Dimensions(mm)Table3‐3.6:Externalstaticpressure
AA≥300ESP(Pa)Remarks
BB≥2500Factorydefault
CC≤3000
0–20Removesteelmeshand
connecttoduct<3mlong

D630≤D≤660
EE=A+630>20Customizationoption
θ Θ≤15°  

3.4.2 OptionB–Longitudinalducting
Figure3‐3.5:Longitudinalductingfor14HP,16HP,18HP,20HPand22HPunits(unit:mm)



Table3‐3.7:Ductdimensions   
Dimensions(mm) Tab le3‐3.8:Externalstaticpressure
AA≥300ESP(Pa)Remarks
BB≥250
0Factorydefault
CC≤3000
0–20Removesteelmeshand
connecttoduct<3mlong

DD=A+1290 
θ Θ≤15°
>20Customizationoption
     


1290
Support
Radius
Radius
Airoutletlouver(optional)
630
A
C
D
B
90
100
θ
E
1290
1020
300
320
12×φ3.3
630
630
Support
Radius
Radius
Airoutletlouver(optional)
1290
A
C
B
90
100
θ
D
1310
1290
1020
300
320
12×φ3.3
630
12 ×ST3.9self‐
threadingscrews
Removethe
steelmeshes
first
12 ×ST3.9self‐
threadingscrews
Removethe
steelmeshes
first


9

3.5 FanPerformance
Thedefaultexternalstaticpressureofoutdoorunits’airoutletsiszero.Withthesteelmeshcoverremovedtheexternal
staticpressureis20Pa.Withcustomizationoptions,externalstaticpressurecanbeincreasedto40Pa.

Figure3‐3.6:8HPand10HPunitsfanperformanceFigure3‐3.7:12HPunitsfanperformance


Figure3‐3.8:14HPand16HPunitsfanperformance

Figure3‐3.9:18HPunitsfanperformance


Figure3‐3.10:20HPand22HPunitsfanperformance
Staticpressure(Pa)
A
irvolume(m
3
/h)
10,800
11,000
11,200
11,400
11,600
11,800
12,000
12,200
0 1020304050
B:Customized
A:Default
Staticpressure(Pa)
Airvolume(m
3
/h)
B:Customized
A:Default
10,800
11,000
11,200
11,400
11,600
11,800
12,000
12,200
0 1020304050
Staticpressure(Pa)
Airvolume(m
3
/h)
13,200
13,400
13,600
13,800
14,000
14,200
14,400
14,600
0 1020304050
B:Customized
A:Default
Staticpressure(Pa)
Airvolume(m
3
/h)
15,750
15,800
15,850
15,900
15,950
16,000
16,050
16,100
0 1020304050
B:Customized
A:Default
Staticpressure(Pa)
Airvolume(m
3
/h)
01020304050
B:Customized
A:Default
14,600
14,800
15,000
15,200
15,400
15,600
15,800
16,000
16,200
Beforeinstallingoutdoorunitducting,besureto
removetheunit’ssteelmeshcover,otherwiseairflow
willbeadverselyaffected.
Notesforinstallers



10

3.6 SnowShielding
Inareasofhighsnowfall,snowshieldsshouldbeinstalledonairinletsandoutletstopreventsnowfromenteringtheunits.
Additionally,theheightofthebasestructuresshouldbeincreasedsoastoraisetheunitsfurtherofftheground.

Figure3‐3.11:Outdoorunitsnowshielding


4 RefrigerantPipingDesign
4.1 DesignConsiderations
Refrigerantpipingdesignshouldtakeaccountofthefollowingconsiderations:
Theamountofbrazingrequiredshouldbekepttoaminimum.
Onthetwoinsidesidesofthefirstindoorbranchjoint(“A”inFigures3‐4.2and3‐4.3)thesystemshould,asfaras
possible,beequalintermsofnumberofunits,totalcapacitiesandtotalpipinglengths.

4.2 MaterialSpecification
Onlyseamlessphosphorus‐deoxidizedcopperpipingthatcomplieswithallapplicablelegislationshouldbeused.Temper
gradesandminimumthicknessesfordifferentdiametersofpipingarespecifiedinTable3‐4.1.

Table3‐4.1:Pipingtemperandthickness
Pipingouterdiameter
(mm)Temper1Minimumthickness (mm)
Ф6.35
O
(annealed)
0.8
Ф9.530.8
Ф12.70.8
Ф15.91.0
Ф19.11.0
Ф22.2
1/2H
(halfhard)
1.2
Ф25.41.2
Ф28.61.3
Ф31.81.5
Ф38.11.5
Ф41.31.5
Ф44.51.5
Ф54.01.8
Notes:
1. O:coiledpiping;1/2H:straightpiping.


Snow shield for air outle
t
Snow shield for air inlet
Snow shield for air inlet


11

4.3 PermittedPipingLengthsandLevelDifferences
ThepipinglengthandleveldifferencerequirementsthatapplyaresummarizedinTable3‐4.3andarefullydescribedas
follows(refertoFigure3‐4.2):
1. Requirement1:Thetotallengthofpipinginonerefrigerantsystemshouldnotexceed1000m.Whencalculatingthe
totallengthofpiping,theactuallengthoftheindoormainpipes(thepipingbetweenthefirstindoorbranchjointand
allotherindoorbranchjoints,L2toL12)shouldbedoubled.
2. Requirement2:Thepipingbetweenthefarthestindoorunit(N9)andthefirstoutdoorbranchjoint(N)shouldnot
exceed175m(actuallength)and200m(equivalentlength).(Theequivalentlengthofeachbranchjointis0.5m.)
3. Requirement3:Thepipingbetweenthefarthestindoorunit(N9)andfirstindoorbranchjoint(A)shouldnotexceed
40minlength(Ʃ{L7toL10}+i≤40m)unlessthefollowingconditionsaremetandthefollowingmeasurestaken,in
whichcasethepermittedlengthisupto90m:
Conditions:
a) Eachindoorauxiliarypipe(fromeachindoorunittoitsnearestbranchjoint)jointdoesnotexceed40minlength
(atomeach≤40m).
b) Thedifferenceinlengthbetween{thepipingfromfirstindoorbranchjoint(A)tothefarthestindoorunit(N9)}
and{thepipingfromthefirstindoorbranchjoint(A)tothenearestindoorunit(N1)}doesnotexceed40m.That
is:(Ʃ{L7toL10}+i)‐(Ʃ{L2toL3}+a)  ≤  40m.
Measures:
a) Increasethediameteroftheindoormainpipes(thepipingbetween
thefirstindoorbranchjointandallotherindoorbranchjoints,L2to
L12)asperTable3‐4.2,exceptforindoormainpipeswhichare
alreadythesamesizeasthemainpipe(L1),forwhichnodiameter
increasesarerequired.
4. Requirement4:Thelargestleveldifferencebetweenindoorunitand
outdoorunitshouldnotexceed90m(iftheoutdoorunitisabove)or
110m(iftheoutdoorunitisbelow).Additionally:(i)Iftheoutdoorunitis
aboveandtheleveldifferenceisgreaterthan20m,itisrecommended
thatanoilreturnbendwithdimensionsasspecifiedinFigure3‐4.1isset
every10minthegaspipeofthemainpipe;and(ii)iftheoutdoorunitis
belowandtheleveldifferenceismorethan40m,theliquidpipeofthe
mainpipe(L1)shouldbeincreasedasperTable3‐4.2.
5. Requirement5:Thelargestleveldifferencebetweenindoorunitsshould
notexceed30m.












Table3‐4.2:Diameterincreaserequirements
Original(mm)Increased(mm)
Φ
9.53
Φ
12.7
Φ12.7Φ15.9
Φ15.9Φ19.1
Φ
19.1
Φ
22.2
Φ22.2Φ25.4
Φ25.4Φ28.6
Φ
28.6
Φ
31.8
Φ31.8Φ38.1
Φ38.1Φ41.3
Φ
41.3
Φ
44.5
Φ44.5Φ54.0
Figure3‐4.1:Oilreturnbend(unit:mm)

300
ormore
300
ormore


12

Figure3‐4.2:Permittedrefrigerantpipinglengthsandleveldifferences







Table3‐4.3:Summaryofpermittedrefrigerantpipinglengthsandleveldifferences
PermittedvaluesPipinginFigure3‐4.2
Pipinglengths
Totalpipinglength1≤1000mL1+2xƩ{L2toL12}+Ʃ{atom}
Pipingbetweenfarthestindoor
unitandfirstoutdoorbranch
joint2
Actuallength≤175m
L1+Ʃ{L7toL10}+i
Equivalent
length≤200m
Pipingbetweenfarthestindoorunitandfirst
indoorbranchjoint3≤40m/90mƩ{L7toL10}+i
Level
differences
Largestleveldifferencebetween
indoorunitandoutdoorunit4
Outdoorunitis
above≤90m
Outdoorunitis
below≤110m
Largestleveldifferencebetweenindoorunits5≤30m
Notes:
1. RefertoRequirement1,above.
2. RefertoRequirement2,above.
3. RefertoRequirement3,above.
4. RefertoRequirement4,above.
5. RefertoRequirement5,above.



Firstindoor
branchjoint
Largestleveldifferencebetweenindoor
unitandoutdoorunitH≤90m
LargestleveldifferencebetweenindoorunitsH≤30m
Pipingbetween farthestindoorunitandfirstindoorbranchjointL≤40m
Equivalentlengthofpipingbetween farthestindoorunit
andfirstoutdoorbranchjointL≤200m
N 1
(140)
N
4
(140)
N
7
(140)
N
8
(140)
N
10
(28)
N
12
(56)
N
11
(140)
N
3
(71)
N
6
(28)
N 13
(56)
A
B
GH
K
I
L
C
E
L
1
L 2
L 3
L 5
L 7
L 8
L 11
L 12
L 9
a
c
d
f
gh
j
lm
k
MN
g1 g2 g3
G
1
12HP 12HP 22HP
D
N
2
(140)
b
L
4
N 5
(140)
F
L
6
e
N
9
(71)
i
J
L
10
Legend
L1Mainpipe
Figuresinparentheses
indicateindoorunit
capacityindexes.
L2toL12Indoormainpipes
atomIndoorauxiliarypipes
AtoLIndoorbranchjoints
M,NOutdoorbranchjoints
g1tog3,G1Outdoorconnectionpipes


13

4.4 SelectingPipingDiameters
Tables3‐4.4to3‐4.8,below,specifytherequiredpipediametersfortheindoorandoutdoorpiping.Themainpipe(L1)and
firstindoorbranchjoint(A)shouldbesizedaccordingtowhicheverofTables 3‐4.4and3‐4.5indicatesthelargersize.

Figure3‐4.3:Selectingpipingdiameters









Tab le3‐4.4:Mainpipe1(L1),indoormainpipes(L2toL12)andindoorbranchjointkits
Totalcapacityofindoorunits(kW)Gaspipe(mm)Liquidpipe(mm)Branchjointkit
 Capacity<16.6Φ15.9
Capacity<23Φ19.1Φ9.53FQZHN‐01D
23≤Capacity<33Φ22.2Φ9.53FQZHN‐02D
33≤Capacity<46Φ28.6Φ12.7FQZHN‐03D
46≤Capacity<66Φ28.6Φ15.9FQZHN‐03D
66≤Capacity<92Φ31.8Φ19.1FQZHN‐03D
92≤Capacity<135Φ38.1Φ19.1FQZHN‐04D
135≤Capacity<180Φ41.3Φ22.2FQZHN‐05D
180≤Capacity Φ44.5Φ25.4FQZHN‐05D
Notes:
1. Themainpipe(L1)andfirstindoorbranchjoint(A)shouldbesizedaccordingtowhicheverofTables3‐4.4
and3‐4.5indicatesthelargersize.


N 1
(140)
N
4
(140)
N
7
(140)
N
8
(140)
N
10
(28)
N
12
(56)
N
11
(140)
N
3
(71)
N
6
(28)
N 13
(56)
A
B
GH
K
I
L
C
E
L
1
L 2
L 3
L 5
L 7
L 8
L 11
L 12
L 9
a
c
d
f
gh
j
lm
k
MN
g1 g2 g3
G
1
12HP 12HP 22HP
D
N
2
(140)
b
L
4
N 5
(140)
F
L
6
e
N
9
(71)
i
J
L
10
Firstindoor
branchjoint
Alternativeoutdoorunitarrangements



Mainpipe
M
g1 g2
MNO
G 2
G 1
Mainpipe
g1 g2 g3 g4
Legend
L1Mainpipe
Figuresinparentheses
indicateindoorunit
capacityindexes.
L2toL12 Indoormainpipes
atomIndoorauxiliarypipes
AtoLIndoorbranchjoints
MtoOOutdoorbranchjoints
g1tog4,G1,G2Outdoorconnectionpipes
Φ9.53FQZHN‐01D
16.6≤
7
7
7
7
7
7
7
7
7


14

Tab le3‐4.5:Mainpipe1(L1)andfirstindoorbranchjoint(A)
Totalcapacityof
outdoorunits
Equivalentlengthofallliquidpipes<90mEquivalentlengthofallliquidpipes≥90m
Gaspipe(mm)Liquidpipe(mm)BranchjointkitGaspipe(mm)Liquidpipe(mm)Branchjointkit
8HPΦ22.2Φ9.53FQZHN‐02DΦ22.2
Φ9.53FQZHN‐02DΦ25.4Φ12.7FQZHN‐02D
12‐14HPΦ25.4Φ12.7FQZHN‐02DΦ28.6Φ15.9FQZHN‐03D
16HPΦ28.6Φ12.7FQZHN‐03DΦ31.8Φ15.9FQZHN‐03D
18‐22HPΦ28.6Φ15.9FQZHN‐03DΦ31.8Φ19.1FQZHN‐03D
24HPΦ28.6Φ15.9FQZHN‐03DΦ31.8Φ19.1FQZHN‐03D
26‐34HPΦ31.8Φ19.1FQZHN‐03DΦ38.1Φ22.2FQZHN‐04D
36‐50HPΦ38.1Φ19.1FQZHN‐04DΦ38.1Φ22.2FQZHN‐04D
52‐66HPΦ41.3Φ22.2FQZHN‐05DΦ44.5Φ25.4FQZHN‐05D
68‐88HPΦ44.5Φ25.4FQZHN‐05DΦ54.0Φ25.4FQZHN‐06D
Notes:
1. Themainpipe(L1)andfirstindoorbranchjoint(A)shouldbesizedaccordingtowhicheverofTabl es3‐4.4and3‐4.5indicatesthelargersize.


Table3‐4.6:Outdoorconnectionpipes(g1tog4,G1,G2)Table3‐4.7:Outdoorbranchjointkits(NtoO)
PipesOutdoorunit
capacityGaspipe(mm)Liquidpipe(mm)No.ofoutdoor unitsBranchjointkit
g1tog4
8‐12HPΦ25.4Φ12.7 2FQZHW‐02N1D
14‐22HPΦ31.8Φ15.9 3FQZHW‐03N1D
G1 Φ38.1Φ19.1 4FQZHW‐04N1D
G2 Φ41.3Φ22.2  



Table3‐4.8:Indoorauxiliarypipes(atom)
Capacityofindoorunit
(kW)
Pipelength≤10mPipelength>10m1
Gaspipe(mm)Liquidpipe(mm)Gaspipe(mm)Liquidpipe(mm)
≤4.5Φ12.7Φ6.35Φ15.9Φ9.53
≥5.6Φ15.9Φ9.53Φ19.1Φ12.7
Notes:
1. Anindoorauxiliarypipeshouldnotbelargerthantheindoormainpipeimmediatelyupstreamofit.Forindoorauxiliary
pipesgreaterthan10minlengthwithindoorunitsofcapacitygreatthanorequalto5.6kW,thegasandliquidsidepipes
shouldeacheitherbesizedaccordingtothistable,orelsebethesamesizeastheindoormainpipeimmediately
upstream,whicheverissmaller.





Φ12.7FQZHN‐02D
10HPΦ22.2
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7


15

4.5 RefrigerantPipingSelectionExample
Theexamplebelowillustratesthepipingselectionprocedureforasystemconsistingofthreeoutdoorunits(22HP+12HP+
12HP)and13indoorunits.Thesystem'sequivalenttotalpipinglengthisinexcessof90m;thepipingbetweenthe
farthestindoorunitandthefirstindoorbranchjointislessthan40minlength;andeachindoorauxiliarypipe(fromeach
indoorunittoitsnearestbranchjoint)islessthan10minlength.
Figure3‐4.4:Refrigerantpipingselectionexample





Step1:Selectindoorauxiliarypipes
IndoorunitsN1toN5,N7toN9andN11toN13areofcapacity5.6kWorgreaterandtheirindoorauxiliarypipesareless
than10minlength.RefertoTable3‐4.8.Indoorauxiliarypipesatoe,gtoi,andktomareΦ15.9/Φ9.53.
IndoorunitsN6andN10areofcapacitylessthan4.5kWandtheirindoorauxiliarypipesarelessthan10minlength.
RefertoTable3‐4.8.IndoorauxiliarypipesfandjareΦ12.7/Φ6.35.
Step2:SelectindoormainpipesandindoorbranchjointsBtoL
Theindoorunits(N2andN3)downstreamofindoorbranchjointDhavetotalcapacityof14+7.1=21.1kW.Referto
Table3‐4.4.IndoormainpipeL4isΦ19.1/Φ9.53.IndoorbranchjointDisFQZHN‐01D.
Theindoorunits(N1toN6)downstreamofindoorbranchjointBhavetotalcapacityof14x4+7.1+2.8=65.9kW.
RefertoTable3‐4.4.IndoormainpipeL2isΦ28.6/Φ15.9.IndoorbranchjointBisFQZHN‐03D.
TheotherindoormainpipesandindoorbranchjointsCandEtoLareselectedinthesamefashion.
Step3:SelectmainpipeandindoorbranchjointA
Theindoorunits(N1toN13)downstreamofindoorbranchjointAhavetotalcapacityof14x7+7.1x2+5.6x2+2.8
x2=129kW.Thesystem'sequivalenttotalpipinglengthisinexcessof90m.Thetotalcapacityoftheoutdoorunitsis
22+12+12=46HP.RefertoTables3‐4.4and3‐4.5.MainpipeL1isthelargerofΦ38.1/Φ19.1andΦ38.1/Φ22.2,
henceΦ38.1/Φ22.2.IndoorbranchjointAisFQZHN‐04D.
Step4:Selectoutdoorconnectionpipesandoutdoorbranchjoints
Themasterunitis22HPandtheslaveunitsare12HP.RefertoTable3‐4.6.Outdoorconnectionpipesg1andg2are
Φ25.4/Φ12.7andoutdoorconnectionpipeg3isΦ31.8/Φ15.9.
RefertoTable3‐4.6.OutdoorconnectionpipeG1isΦ38.1/Φ19.1.
N 1
(140)
N
4
(140)
N
7
(140)
N
8
(140)
N
10
(28)
N
12
(56)
N
11
(140)
N
3
(71)
N
6
(28)
N 13
(56)
A
B
GH
K
I
L
C
E
L
1
L 2
L 3
L 5
L 7
L 8
L 11
L 12
L 9
a
c
d
f
gh
j
lm
k
MN
g1 g2 g3
G
1
12HP 12HP 22HP
D
N
2
(140)
b
L
4
N 5
(140)
F
L
6
e
N
9
(71)
i
J
L
10
Firstindoor
branchjoint
Legend
L1Mainpipe
L2toL12Indoormainpipes
atomIndoorauxiliarypipes
AtoLIndoorbranchjoints
M,NOutdoorbranchjoints
g1tog3,G1Outdoorconnectionpipes
Figuresinparenthesesindicateindoorunit
capacityindexes.


16

Therearethreeoutdoorunitsinthesystem.RefertoTable3‐4.7.OutdoorbranchjointsMandNareTFQZHW‐03N1D. 


17

4.6 BranchJoints
Branchjointdesignshouldtakeaccountofthefollowing:
U‐shapedbranchjointsshouldbeused–teejointsarenotsuitable.BranchjointdimensionsaregiveninTables3‐4.9
and3‐4.10.
Toavoidaccumulationofoilintheoutdoorunits,outdoorbranchjointsshouldbeinstalledhorizontallyandmustnot
behigherthantheoutdoorunitrefrigerantoutlets.RefertoFigure3‐5.9inInstallationManual,5.6“BranchJoints”.
Indoorbranchjointsmaybeinstalledeitherhorizontallyorvertically.
Toensureevendistributionofrefrigerant,branchjointsshouldnotbeinstalledwithin500mmofa90°bend,another
branchjointorthestraightsectionofpipingleadingtoanindoorunit,withtheminimum500mmbeingmeasured
fromthepointwherethebranchjointisconnectedtothepiping,asshowninFigure3‐4.5.

Figure3‐4.5:Branchjointspacingandseparationfrombends(unit:mm)




500ormore500ormore500ormore
500ormore500ormore
Indoor
unit
Indoor
unit
Indoor
unit


18

Table3‐4.9:Indoorbranchjointdimensions(unit:mm)
ModelGassidejointsLiquidsidejoints
TFQZHN‐01D


TFQZHN‐02D


TFQZHN‐03D

TFQZHN‐04D

TFQZHN‐05D

TFQZHN‐06D



ID:12.7
(ID:15.9)
OD:19.1
ID:19.1
OD:19.1
ID:19.1
ID:15.9
ID:12.7
(ID:15.9)
OD:19.1
OD:12.7
ID:9.5
ID:9.5
ID:6.4
OD:9.5
ID:6.4 OD:9.5
ID:9.5
ID:15.9
(ID:19.1)
OD:22.2
ID:22.2
OD:22.2
ID:22.2
ID:25.4
ID:15.
9
(ID:19.1)
OD:22.2
ID:12.7
OD:12.7
ID:6.4
ID:9.5
OD:12.7
OD:12.7
ID:12.7
ID:9.5
ID:12.7
ID:6.
4
ID:9.5
ID:28.6 ID:31.8
OD:28.6
ID:28.6
ID:19.1
ID:22.2
OD:28.6
ID:19.1
ID:22.2
OD:28.6
ID:15.
9
ID:15.9
OD:15.9
ID:19.1
(ID:12.7)
OD:15.9
ID:9.5
ID:15.9
(ID:12.7)
OD:15.9
ID:9.5
ID:6.4
ID:19.1
ID:22.2
ID:28.6
OD:34.9
ID:34.9
OD:34.9
ID:38.1
ID:22.2
ID:28.6
OD:34.9
ID:34.9
ID:12.7
(ID:15.9)
OD:19.1
ID:19.1
OD:19.1
ID:19.1
ID:22.2
ID:12.7
(ID:15.9)
OD:19.1
ID:9.5
ID:34.9
ID:41.3
ID:34.9
ID:41.3
ID:41.3
ID:44.5
ID:44.5
OD:41.3
ID:15.9
(ID:19.1)
OD:22.2
ID:22.2
OD:22.2
ID:22.2
ID:25.4
ID:15.9
(ID:19.1)
OD:22.2
ID:12.7
ID:54
ID:34.9
ID:41.3
ID:63.5
ID:54
OD:54
OD:54
ID:41.3
ID:63.5
ID:15.9
(ID:19.1)
OD:22.2
ID:22.2
(ID:19.1)
OD:22.2
ID:22.2
ID:25.4
ID:25.4
OD:22.2


19

Table3‐4.10:Outdoorbranchjointdimensions(unit:mm)
ModelGassidejointsLiquidsidejoints
TFQZHW‐02N1D

TFQZHW‐03N1D

TFQZHW‐04N1D

0D:31.8
ID:25.4
0D:31.8
ID:31.8
ID:25.4
Q1
Q2
ID:34.9
ID:31.8
ID:31.8
Q4
0D:34.9
ID:38.1
ID:34.9
Q3
ID:19.1
ID:15.9
ID:15.9
Y6
ID:15.9 0D:15.9
ID:12.7
ID:12.7
0D:15.9
Y1
Y2
0D:19.1
ID:22.2
ID:19.1
Y3
ID:31.8
0D:34.9
ID:31.8 ID:38.1
ID:34.9
0D:31.8
ID:25.4
0D:31.8
ID:31.8
ID:25.4
Q1
Q2 Q7
ID:38.1
ID:41.3
ID:31.8
0D:31.8
ID:31.8
ID:25.4
Q1
Q5
ID:15.9
ID:15.9
ID:19.1
ID:15.9
0D:15.9
ID:12.7
ID:12.7
0D:15.9
Y1
Y6
Y2
ID:19.1 ID:22.2
ID:15.9
0D:15.9
ID:15.9
ID:12.7
Y1
Y7
0D:22.2
ID:19.1
Y4
ID:31.8
0D:34.9
ID:31.8 ID:38.1
ID:34.9
0D:31.8
ID:25.4
0D:31.8
ID:31.8
ID:25.4
Q1
Q2 Q7
ID:38.1
ID:41.3
ID:31.8
0D:31.8
ID:31.8
ID:25.4
Q1
Q5
ID:41.3
ID:44.5
ID:31.8
0D:31.8
ID:31.8
ID:25.4
Q1
Q6
Description
ID:15.9
ID:19.1
ID:15.9
ID:15.9
0D:15.9
ID:12.7
ID:12.7
0D:15.9
Y1
Y6
Y2
ID:19.1 ID:22.2
ID:15.9
0D:15.9
ID:15.9
ID:12.7
Y1
Y7
ID:25.4
ID:22.2
ID:15.9
0D:15.9
ID:15.9
ID:12.7
Y1
Y8
0D:25.4
ID:22.2
Y5