LMCN078HV Engineering Manual

REFRIGERANT PIPING DESIGN
Design Guideline Summary
The following are examples of manual pipe size calculations. Designers are highly encouraged to use LATS for Multi F systems.
Max. 49.2 feet
Max. 24.6 feet
A
B
C
D
Multi F with LGRED System
Example: LMU300HHV outdoor unit with four (4)
indoor units connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
A, B, C, D: Pipes from Outdoor Unit to Indoor Unit.
Outdoor Unit
Minimum Length
for Each Pipe
(ft.)
Maximum Piping Length to
Each Indoor Unit (ft.)
Maximum Total Piping
Length for Each System
(ft.)
Maximum Height Difference
(Max. [ft.])
Outdoor Unit ~ Indoor Unit
Maximum Height Difference
(Max. [ft.])
Indoor Unit ~ Indoor Unit
A B C D
LMU180HHV 10 82 82 - - 164 49.2 24.6
LMU240HHV 10 82 82 82 - 246.1 49.2 24.6
LMU300HHV 10 82 82 82 82 246.1 49.2 24.6
Table 119:Multi F with LGRED Outdoor Unit Refrigerant Piping System Limitations.
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]).
Multi F MAX with LGRED System with One Branch Distribution Unit
A
h2 ≤ 49.2 feet
h3 ≤ 32.8 feet
h1 ≤ 98.4 feet
BDU
ODU
IDU
IDU
IDU
IDU
B
B
B
B
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202 | DESIGN & PRACTICES
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F