LG MULTI F Engineering Manual page 57

F
MULTI
WITH
F
MULTI MAX
Following pages present Multi F / MAX with LGRED piping limitations and are for illustrative purposes only. Designers are highly encouraged to use
LATS when designing Multi F / MAX with LGRED systems.
Example of a Multi F MAX with LGRED System with One Branch Distribution
Unit
Example: LMU360HHV outdoor unit with
four (4) indoor units and one (1) branch
distribution unit connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
BDU: Branch Distribution Unit.
A: Main Pipe.
B: Branch Pipe (Branch Distribution Unit to
Indoor Unit[s]).
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.
BDU: Branch Distribution Unit(s).
Indoor Unit[s]).
Table 29: 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 Distribu-
tion Units to Indoor Units: B)
If outdoor unit is above or below indoor unit (h1)
Elevation Differential
(All Elevation
Limitations are
Between branch distribution unit and farthest
Measured in Actual
Feet)
h1
ODU
h1
Between the farthest two indoor units (h2)
connected indoor unit(s) (h3)
Between branch distribution units (h4)
©
ODU
BDU
A
h3
A
Y-Branch
A
A
Minimum
10 feet
Maximum
Minimum
10 feet
Maximum
PIPING LIMITATIONS
IDU
B
IDU
B
B
B
IDU
BDU
B
IDU
B
B
BDU IDU
B
IDU
B
B
Table 30: Multi F MAX with LGRED Piping Sizes.
Main Pipe A
Piping
(inch)
Liquid Ø3/8
of the indoor unit piping
Gas Ø3/4
PIPING AND PLACEMENT | 57
h2
IDU
IDU
IDU
IDU
Branch Pipe B
Depends on the size