LG Multi V ARUN053GF2 - LG Y-branch Kits, Header Kits, and Installation

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General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
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LG Engineered Y-branch Kits and Header Kits
LG Y-branch and Header kits are highly engineered devices designed to evenly divide the flow of refrigerant, and are used to join one pipe
segment to two or more segments.
No Substitutions
Only LG supplied Y-branch and Header ttings (as referenced below; sold separately) can be used to join one pipe segment to two or more
segments. Third-party or eld-fabricated Tee’s, Y-ttings, Headers, or other branch ttings are not qualied for use with LG Multi V Space II
systems. The only eld-provided ttings allowed in a Multi V Space II piping system are 45° and 90° elbows.
Table 11: Y-Branches and Headers.
• If the diameter of the branch pipe segments differ from that of the designated refrigerant piping, trim the to the desired section using a pipe
cutter, and then use an adapter to connect.
• Always follow manufacturer’s guidelines on refrigerant piping restrictions such as maximum length, elevation difference, and diameters.
Failure to do so can result in reduced heating / cooling performance or equipment malfunction.
Y-branches
Headers
4 branch 7 branch 10 branch
ARBLN01621 ARBLN07121 ARBL054 ARBL057 ARBL1010
ARBLN03321 ARBLN14521 ARBL104 ARBL107 ARBL2010
LG Y-branch kits consist of:
• Y-branches (liquid line, vapor lines).
• Reducer fittings as applicable.
• Molded clam-shell type insulation covers.
LG Header kits consist of:
• Two Headers (one liquid line, one vapor line).
• Reducer fittings as applicable.
• Molded clam-shell type insulation covers.
Y-branch Kits
LG supplied Y-branches must be used at each transition. Field-supplied “T”
fittings or “Y” branches are not acceptable. Each LG supplied Y-branch kit comes
with two (2) Y-branches for indoor units, step-down pipe reducers, and insulation
covers.
Y-branches may be installed in horizontal or vertical configurations. When
installed vertically, position the Y-branch so the straight-through leg is ±3° of
plumb. When installed horizontally, position the Y-branch so the take-off leg is lev-
el and shares the same horizontal plane as the straight-through leg ±10° rotation.
There is no limitation on the number of Y-branches that can be installed, but there
is a limitation on the number of indoor units connected to a single water source
unit.
Y-branches should always be installed with the single port facing the water-source
unit, the two-port end facing indoor units (Do not install Y-branches backwards as
shown in Figure 15.) Refrigerant flow cannot make U-turns through Y-branches.
The first Y-branch kit must be located at least three (3) feet from the outdoor unit.
Figure 12: Y-branch Connections.
Figure 13: Y-branch Installation Alignment Specication.
Vertical up conguration.
Vertical down conguration.
Figure 14: Horizontal Conguration End View.
±10°
Horizontal Plane
±10°
Branch Leg
Straight-through Leg
Y-branch Inlet
To indoor unit
To indoor unit
To outdoor unit
To next branch
To indoor unit
Figure 15: Diagram of an Incorrect
Y-branch Installation.
Provide a minimum of 20 inches
between a Y-branch and any
other fittings or indoor unit piped
in series. It is recommended that
when a Y-branch is located in a
pipe chase or other concealed
space, access doors should be
provided for inspection access.
The equivalent pipe length of
each Y-branch (1.6′) must be
added to each pipe segment
entered into LATS piping design
software.
GENERAL INSTALLATION GUIDELINES
Piping Materials and Handling