LG LMN078HVT Installation & Maintenance page 23

F
MULTI
F
MULTI MAX
Multi F MAX Y-Branch Kit PMBL5620
The LG supplied Y-Branch Kit PMBL5620 MUST be used when two branch distribution units are connected to one Multi F MAX system.
Field-supplied fittings are not permitted. Each Y-Branch kit comes with two (2) Y-branches (one for the liquid line and one for the vapor line)
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 level and shares the same horizontal plane as the
straight-through leg ±5° rotation.
Y-branches should always be installed with the single port facing the outdoor unit and the two-port end facing the branch distribution units.
Do not install Y-branches backwards as refrigerant flow cannot make U-turns. The Y-branch kit must be located at least three (3) feet from
the outdoor unit. Provide a minimum of 20 inches between a Y-branch and the branch distribution unit.
Figure 14: Y-Branch Port Identification and Dimensions.
1
1
A
X
A = To Outdoor Unit
B = To Branch Distribution Unit
Figure 15: Y-branch Horizontal Installation Alignment.
A
Viewed from A in direction of arrow
Y-Branch Kit 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.
Table 11: Insulation Jacket Properties.
Material
UL94 Flame Classification
Density
Thermal Conductivity
Thickness
GENERAL INSTALLATION GUIDELINES
2
3
2
B
Y
3
Horizontal
plane
Within ±5°
Polyolefin Foam
HF-1
1.84 lbs./ft.
3
.0208 Btu/h/ft. ºR
1/2 inch
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.
Table 12: Multi F MAX Y-Branch Connection Diameters.
Y-Branch
Model
Type
Liquid
Vapor
Y-Branch
PMBL5620
Type
Liquid
Vapor
Figure 16: Y-branch Vertical Installation Alignment.
Vertical Up Configuration
Within ± 3°
Figure 17: Y-Branch Insulation Jacket Diagram.
Y-Branch Kit Insulation
Refrigerant Piping
Port Identifier (inch)
1 2
Ø3/8 Ø3/8
Ø3/4 Ø3/4
Dimensions (inch)
X
13.80 3.24
12.48 3.02
Vertical Down Configuration
Within ± 3°
Field-Supplied Insulation Tape
Liquid and Gas
Pipe Joints
3
Ø3/8
Ø3/4
Y
Insulation for
Field-Installed Piping
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