Multi F Engineering Manual

Design Guideline Summary
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REFRIGERANT PIPING DESIGN
B
A
h2 IHHW
A
h3 IHHW
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h1 IHHW
BDU Y-Branch
BDU
IDU
A
ODU
IDU
IDU
IDU
IDU
IDU
B
B
B
B
B
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.
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Indoor Unit[s]).
7DEOH Multi F MAX with LGRED Outdoor Unit Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent
Length of pipe in Feet)
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Main pipe (Outdoor Unit to
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Minimum
10 feet
Maximum
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Branch pipe (Branch Distribu-
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Minimum
10 feet
Maximum
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Elevation Differential
(All Elevation
Limitations are
Measured in Actual
Feet)
If outdoor unit is above or below indoor unit (h1)
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Between the farthest two indoor units (h2)
IHHW
Between branch distribution unit and farthest
connected indoor unit(s) (h3)
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Between branch distribution units (h4)
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7DEOH Multi F MAX with LGRED 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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202 | DESIGN & PRACTICES
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F