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Refrigerant Piping
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.
port end towards the heat recovery unit. The first indoor unit Y-branch kit must be located at least three (3) feet from the water source unit.
Provide a minimum of twenty (20) inches between a Y-branch and any other fittings or indoor unit piped in series.
There is no limitation on the number of indoor unit Y-branches that can be installed, but there is a limitation on the number of indoor units
connected to a single water source unit. 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.
Water Source Unit Y-Branches
Water source unit Y-branches can only be installed in a horizontal or
vertical UP configuration. The vertical DOWN configuration is not permit-
ted. When installed vertically, position the Y-branch at a level lower than
the outdoor units it serves, so the straight-through leg is within ±3° of
plumb. When installed horizontally, position the Y-branch so the take-off
leg is level and shares the same horizontal plane as the straight-through
leg within ±5° rotation.
Water source unit Y-branches must always be installed with the two-port
ends connected to the piping coming from the water source units, and
the single port end towards the indoor unit refrigerant piping system
supporting the indoor units. Water source unit Y-branches are usually
installed close to the water source unit, leaving enough space for servic-
ing and maintenance.
Figure 24: Y-branch Insulation and Pipe Detail.
Header kits are intended for use where multiple indoor units are in
the same vicinity and it would be better to “home-run” the run-out
pipes back to a centralized location. If connecting multiple indoor
units that are far apart, Y-branches may be more economical. See
“Header Kits” on page 41 for specifications and capacities.
Y-branches can be installed between the header and the water
source unit, but a Y-branch cannot be installed between a header
and an indoor unit. Headers must be installed in a horizontal and
level position with the distribution ports of the fitting in the same
horizontal plane as the straight-through branch (Figure 25).
When connecting indoor units to a header, always connect the unit
with the largest nominal capacity to the port closest to the water
source unit. Then install the next largest indoor unit to the next port,
working down to the smallest indoor unit. Do not skip ports.
All indoor units connected to a single header fitting should be lo-
cated with an elevation difference between indoor units that does not
exceed 131 feet. If indoor units are located at an elevation the same
as or above the header fitting, do not use a header. Instead, install
a Y-branch fitting between the water source unit and the header fit-
ting, and connect the elevated indoor unit to the Y-branch.
Header Insulation
Each header kit comes with two (heat pump kits) or three (heat re-
covery kits) clam-shell type peel and stick insulation jackets molded
to fit the header fittings (Figure 26).
Header Kits
Install Correctly
• Y-branches can be installed upstream between a header and the WSU, but a Y-branch cannot be installed between a header and an IDU.
• To avoid the potential of uneven refrigerant distribution through a header fitting, minimize the difference in equivalent pipe length between
the header fitting and each connected indoor unit.
LG supplied insulation jacketLG supplied header
Field supplied copper pipe
Field supplied insulation
Field supplied copper pipe
Figure 25: Header Horizontal Rotation Limit—Install Level with No Rotation.
Figure 26: Header Insulation and Pipe Detail.
Smaller IDUs
Connect IDUs
Largest IDU
Header Inlet
Header End View
+0.0
-0.0
REFRIGERANT PIPING INSTALLATION
LG Header kits consist of:
• Headers (Qty 2 for all kits)
• Reducer fittings as applicable
• Molded clam-shell type insulation covers
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