16
Multi F Standard Wall-Mounted Indoor Unit
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MA
TI
F
TI
GENERAL DATA
Typical Multi F/Multi F Max Systems
Example: LMU540HV outdoor unit with seven
(7) indoor units, and two (2) branch distribu-
tion units connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
BD: Branch Distribution Unit(s).
ΣA: Main Piping.
ΣB: Branch Piping (Branch Distribution Unit[s]
to Indoor Unit[s]).
B
A
h2 ≤ 49.2 feet
A
h3 ≤ 32.8 feet
h4 ≤ 49.2 feet
h1 ≤ 98.4 feet
BDU Y-Branch
BDU
IDU
A
IDU
IDU
IDU
IDU
IDU
IDU
B
B
B
B
B
B
Typical Multi F MAX System with Two Branch Distribution Units
Table 8: Multi F MAX Outdoor Unit Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent
Length of pipe
in Feet)
Total piping length (ΣA + ΣB)
≤475.7 feet
Main pipe
(Outdoor Unit to Branch
Distribution Units: ΣA)
Minimum
9.8 feet
Maximum
≤180.4 feet
Total branch piping length (ΣB)
≤295.3 feet
Branch pipe
(Branch Distribution Units
to Indoor Units: B)
Minimum
9.8 feet
Maximum
≤49.2 feet
Elevation Differential
(All Elevation
Limitations are
Measured in
Actual Feet)
If outdoor unit is above or below indoor unit (h1)
≤98.4 feet
Between the farthest two indoor units (h2)
≤42.9 feet
Between branch distribution unit and farthest
connected indoor unit(s) (h3)
≤32.8 feet
Between branch distribution units (h4)
≤42.9 feet
Table 9: Multi F MAX Piping Sizes.
Piping
Main Pipe A
(inch)
Branch Pipe B
Liquid Ø3/8
Depends on the size
of the indoor unit piping
Gas Ø3/4
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