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REFRIGERANT PIPING DEsIGN
System Engineering
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:
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
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:
Table 24: Multi IV Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent Length
of pipe in Feet)
Elevation
(All Elevation Limitations
are Measured in Actual
Feet)
Table 25: Equivalent Piping Length for Y-branches, Headers, and Other Piping Components.
Component
Elbow (ft.)
Y-branch (ft.)
1
Header (ft.)
Heat Recovery Unit (ft.) (For ARUB
Heat Recovery Units only)
Kit contains two Y-branches: one for liquid and one for vapor.
1
96
Longest total equivalent piping length
Longest distance from outdoor unit to indoor unit
Distance between fittings and indoor units
Distance between fittings and Y-branches
Distance between two Y-branches
Distance between two series-piped heat recovery
units (ARUB Series only)
Minimum distance between indoor unit to any
Y-branch
Maximum distance between first Y-branch to farthest
indoor unit
If outdoor unit is above or below indoor unit
Between indoor units on heat pump systems (ARUN
Series), or indoor units connected to separate
parallel heat recovery units (ARUB Series)
Between indoor units connected to single heat
recovery unit or series heat recovery units (ARUB
series only)
1/4
3/8
1/2
0.5
0.6
0.7
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
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
131 feet (295 feet for conditional applications)
Size (Inches)
5/8
3/4
7/8
1
0.8
1.2
1.3
1.5
1.6
3.3
8.2
3,280 feet
656 feet (Actual) 738 feet (Equivalent)
≥20 inches
≥20 inches
≥20 inches
≥20 inches
3 feet from indoor unit to Y-branch
360 feet
131 feet
49 feet
1-1/8 1-1/4 1-3/8 1-1/2 1-5/8 1-3/4 2-1/8
1.6
1.8
2.0
2.1
2.3
2.5
2.8
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