Multi F Engineering Manual

MULTI F MAX BD UNIT
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A
B
X
Y
1
2
3
A = To Outdoor Unit
B = To Branch Distribution Unit
1
2
3
Figure 37: <%UDQFK 3RUW ,GHQWL¿HU 'LDJUDP
Figure 38: Y-Branch Dimensions Diagram.
Model Y-Branch Type
3RUW ,GHQWL¿HU LQFK
123
PMBL5620
Liquid Ø3/8 Ø3/8 Ø3/8
Vapor Ø3/4 Ø3/4 Ø3/4
Y-Branch Type
Dimensions (inch)
XY
Liquid 13.80 3.24
Vapor 12.48 3.02
The LG-supplied Y-Branch kit PMBL5620 MUST be used when
installing two (2) branch distribution units in parallel on one (1) Multi
F MAX system. Field-supplied fittings are not permitted. Each
Y-Branch kit includes 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 configura-
tions. 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 must be properly installed following instructions in the
applicable LG manual. Y-branches must 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 locat-
ed at least three (3) feet from the outdoor unit. Provide a minimum of
20 inches between a Y-branch and the branch distribution unit.
It is recommended that when a Y-branch is located in a pipe chase
or other concealed space, access doors must be provided for
inspection access.
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the main pipe segment entered into LATS piping design software.
• Design pressure is 551 psig.
• All dimensions in inches. Tolerance ±1/4 inch.
• Images are not to scale.
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Viewed from A in direction of arrow
Horizontal
plane
Within 5°
A
Within 5°
Vertical Up
Configuration
Within ± 3°Within ± 3°
Vertical Down
Configuration
Multi F MAX Y-Branch Kit PMBL5620
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52 | BD UNIT
Multi F and Multi F MAX Heat Pump System Engineering Manual
MULTI
F
MAX
MULTI
F