LGRED Heat LMU180HHV Installation Manual
34
MULTI F / MULTI F MAX with LGRED Outdoor Unit Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI
F
MAX
MULTI
F
WITH
Table 12: Multi F MAX with LGRED Outdoor Unit Refrigerant Piping System Limitations.
Component
Size (Inches)
1/4 3/8 1/2 5/8 3/4
Elbow (ft.) 0.5 0.6 0.7 0.8 1.2
Y-Branch Kit (ft., Multi F MAX with
LGRED systems only)
1
1.6
Branch Distribution Unit (ft., Multi F
MAX with LGRED systems only)
8.2
Using Refrigerant Components
Field-supplied elbows are allowed as long as they are designed for
use with R410A refrigerant. The designer, however, must be cau-
tious with the quantity and size of fittings used, and must account
for the additional pressure losses in equivalent pipe length calcula-
tion for each branch. The equivalent pipe length of each elbow must
be added to each pipe segment.
Example of a Multi F MAX with LGRED System with Two Branch Distribution
Units
Example: LMU420HHV outdoor unit with six (6) indoor
units and two (2) branch distribution units connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
BD: Branch Distribution Unit(s).
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Table 13: Multi F MAX with LGRED Piping Sizes.
Table 14: Equivalent Piping Length for Elbows, Y-branches, and Branch
Distribution Units.
Pipe Length
(ELF = Equivalent
Length of pipe in
Feet)
7RWDOSLSLQJOHQJWKȉ$ȉ% IHHW
Main pipe (Outdoor Unit to
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Minimum 9.8 feet
Maximum IHHW
7RWDOEUDQFKSLSLQJOHQJWKȉ% IHHW
Branch pipe (Branch Distribution
Units to Indoor Units: B)
Minimum 10 feet
Maximum IHHW
Elevation Differential
(All Elevation
Limitations are
Measured in Actual
Feet)
If outdoor unit is above or below indoor unit (h1) IHHW
Between the farthest two indoor units (h2) IHHW
Between branch distribution unit and farthest
connected indoor unit(s) (h3)
IHHW
Between branch distribution units (h4) IHHW
Max. Combination of
IDUs
LMU360HHV = 48,000 LMU420HHV = 56,000
Multi F MAX with LGRED Outdoor Unit Piping Length and Elevation
Limitations
5()5,*(5$176$)(7<67$1'$5'6
DEVICE CONNECTION LIMITATIONS
h1
C
Branch Pipe
Main Pipe
BD Unit
BD Unit
A
B
h2
Figure 23: Multi F MAX Refrigerant Piping
System Limitations.
Piping Main Pipe A (inch) Branch Pipe B
Liquid Ø3/8
Depends on the size
of the indoor unit piping
Gas Ø3/4
B
A
h2 IHHW
A
h3 IHHW
KIHHW
h1 IHHW
BDU Y-Branch
BDU
IDU
A
ODU
IDU
IDU
IDU
IDU
IDU
B
B
B
B
B