LG MULTI V IV ARUN072BTE4 - System Engineering

96
MULTI V IV System Installation Manual
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Device Connection Limitations
•TheminimumnumberofconnectedandoperatingindoorunitstoMultiIVsystemsisone,takingintoconsiderationoftheminimum
combinationratio.
•ThemaximumnumberofindoorunitsonMultiIVoutdoorheatpumpandheatrecoverysystemsis:
Table24:MultiIVRefrigerantPipingSystemLimitations.
Table25:EquivalentPipingLengthforY-branches,Headers,andOtherPipingComponents.
Component
Size(Inches)
1/4 3/8 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2-1/8
Elbow (ft.) 0.5 0.6 0.7 0.8 1.2 1.3 1.5 1.6 1.8 2.0 2.1 2.3 2.5 2.8
Y-branch (ft.)
1
1.6
Header (ft.) 3.3
Heat Recovery Unit (ft.) (For ARUB
Heat Recovery Units only)
8.2
1
Kit contains two Y-branches: one for liquid and one for vapor.
REFRIGERANT PIPING DESIGN
System Engineering
OneofthemostcriticalelementsofaMultiIVsystemistherefrigerantpiping.Thetablebelowlistspipelengthlimitsthatmustbefollowedin
thedesignofaMultiIVrefrigerantpipesystem:
ARUN072BTE4-DTE4/ARUB072BTE4-DTE4=13
ARUN096BTE4-DTE4/ARUB096BTE4-DTE4=16
ARUN121BTE4-DTE4/ARUB121BTE4-DTE4=20
ARUN144BTE4-DTE4/ARUB144BTE4-DTE4=23
ARUN168BTE4-DTE4/ARUB168BTE4-DTE4=29
ARUN192BTE4-DTE4/ARUB192BTE4-DTE4=32
ARUN216BTE4-DTE4/ARUB216BTE4-DTE4=35
ARUN240BTE4-DTE4/ARUB240BTE4-DTE4=39
ARUN264BTE4-DTE4/ARUB264BTE4-DTE4=42
ARUN288BTE4-DTE4/ARUB288BTE4-DTE4=45
ARUN312BTE4-DTE4/ARUB312BTE4-DTE4=52
ARUN336BTE4-DTE4/ARUB336BTE4-DTE4=55
ARUN360BTE4-DTE4/ARUB360BTE4-DTE4=58
Pipe Length
(ELF = Equivalent Length
of pipe in Feet)
Longest total equivalent piping length 3,280feet
Longest distance from outdoor unit to indoor unit 656feet(Actual)738feet(Equivalent)
Distance between fittings and indoor units ≥20inches
Distance between fittings and Y-branches ≥20inches
Distance between two Y-branches ≥20inches
Distance between two series-piped heat recovery
units (ARUB Series only)
≥20inches
Minimum distance between indoor unit to any
Y-branch
3feetfromindoorunittoY-branch
Maximum distance between first Y-branch to farthest
indoor unit
131feet(295feetforconditionalapplications)
Elevation
(All Elevation Limitations
are Measured in Actual
Feet)
If outdoor unit is above or below indoor unit 360feet
Between indoor units on heat pump systems (ARUN
Series), or indoor units connected to separate
parallel heat recovery units (ARUB Series)
131feet
Between indoor units connected to single heat
recovery unit or series heat recovery units (ARUB
series only)
49feet