LG Multi V water mini Series Installation Operation & Maintenance page 25

Y-branch Insulation
Each Y-branch kit comes with clam-shell type peel-and-stick insulation jackets
molded to fit the Y-branch fittings—one for the liquid line, one for the vapor line.
• Check the fit of the Y-branch clam-shell insulation jacket after the Y-branch is
installed.
• Mark the pipe where the insulation jacket ends.
• Remove the jacket.
• Install field-provided insulation on the three (3) pipes first.
• Peel the adhesive glue protector slip and install the clam-shell jacket over the
fitting.
Header Kits
Note:
Install Correctly
• Y-branches can be installed upstream between the Header and the water-source unit, but a Y-branch cannot be installed between a
header and an indoor unit.
• 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.
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
page 16 for Header kit 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.
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 must be mounted at an elevation below the Header fitting. All indoor units connected to a single Header fitting should be
located with an elevation difference between indoor units that does not exceed 49 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 fitting,
and connect the elevated indoor unit to the Y-branch.
Header Insulation
Each Header kit comes with clam-shell type peel and stick insulation
jackets molded to fit the Header fittings—one for the liquid line and
one for the vapor line.
REFRIGERANT PIPING DESIGN
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.
Figure 16: Y-branch Insulation and Pipe Detail.
Figure 18: Header Kit—Horizontal Rotation Limit (Must be Installed
Level with No Rotation).
Largest IDU
Smaller IDUs
Connect IDUs
Figure 17: Header Insulation and Pipe Detail.
Field supplied insulation
Field supplied copper pipe LG supplied header
System Engineering
Header Inlet
Header End View
Field supplied copper pipe
LG supplied insulation jacket
+0.0
-0.0
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