Using Refrigerant Components - LG MULTI F Series Installation Manual
Multi-zone heat pump systems with lgred 1.5 to 3.5 tons
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- Engineering manual (392 pages) ,
- Installation manual (104 pages) ,
- Owner's manual (234 pages)
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DEVICE CONNECTION LIMITATIONS
Multi F MAX with LGRED Outdoor Unit Piping Length and Elevation
Limitations
Table 12: Multi F MAX with LGRED Outdoor Unit Refrigerant Piping System Limitations.
Main pipe (Outdoor Unit to
Pipe Length
(ELF = Equivalent
Length of pipe in
Feet)
Branch pipe (Branch Distribution
Units to Indoor Units: B)
If outdoor unit is above or below indoor unit (h1)
Elevation Differential
Between the farthest two indoor units (h2)
(All Elevation
Limitations are
Between branch distribution unit and farthest
Measured in Actual
Feet)
Max. Combination of
IDUs
Table 13: Multi F MAX with LGRED Piping Sizes.
Piping
Liquid
Gas
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).
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.
34
connected indoor unit(s) (h3)
Between branch distribution units (h4)
LMU360HHV = 48,000
Main Pipe A (inch)
Ø3/8
Ø3/4
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.
Minimum
9.8 feet
Maximum
Minimum
10 feet
Maximum
LMU420HHV = 56,000
Branch Pipe B
Depends on the size
of the indoor unit piping
ODU
A
Y-Branch
A
h1
Table 14: Equivalent Piping Length for Elbows, Y-branches, and Branch
Distribution Units.
Component
Elbow (ft.)
Y-Branch Kit (ft., Multi F MAX with
LGRED systems only)
Branch Distribution Unit (ft., Multi F
MAX with LGRED systems only)
F
MULTI
WITH
F
MULTI
MAX
Figure 23: Multi F MAX Refrigerant Piping
System Limitations.
Branch Pipe
BD Unit
C
BD Unit
h1
B
Main Pipe
A
IDU
BDU
B
A
IDU
B
B
BDU
IDU
B
IDU
B
B
Size (Inches)
1/4
3/8
0.5
0.6
1
h2
IDU
IDU
1/2
5/8
3/4
0.7
0.8
1.2
1.6
8.2
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