Brochure

32
KEY:
ODU: Outdoor Unit
IDU: Indoor Unit
BDU: Branch Distribution Unit (s)
A, B, C, D: Pipes from ODU to IDU
Σ A: Main Pipe
Σ B: Branch Pipe (BDU(s) to IDU(s))
Max. 49.2 feet
Max. 24.6 feet
A
B
C
D
Multi F System
Example: LMU36CHV 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.)
ABC D
LMU18CHV 10 82 82 - - 164
LMU24CHV 10 82 82 82 - 246.1
LMU30CHV 10 82 82 82 82 246.1
LMU36CHV 10 82 82 82 82 246.1
Multi F Outdoor Unit Refrigerant Piping System Limitations.
Example: LMU540HV outdoor unit with
seven (7) indoor units, and two (2)
branch distribution units connected.
ODU: Outdoor Unit.
IDU: Indoor Unit.
BD: Branch Distribution 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
ODU
IDU
IDU
IDU
IDU
IDU
IDU
B
B
B
B
B
B
Multi F MAX Outdoor Unit Refrigerant Piping System Limitations.
Pipe Length
(ELF = Equivalent
Length of pipe in Feet)
Main pipe (Outdoor Unit to
Minimum
10 feet
Maximum
Branch pipe (Branch Distribu-
tion Units to Indoor Units: B)
Minimum
10 feet
Maximum
Elevation Differential
(All Elevation
Limitations are
Measured in Actual
Feet)
If outdoor unit is above or below indoor unit (h1)
Between the farthest two indoor units (h2)
Between branch distribution unit and farthest
connected indoor unit(s) (h3)
Between branch distribution units (h4)
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
Example: LMU540HV 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
A
h2 ≤ 49.2 feet
h3 ≤ 32.8 feet
h1 ≤ 98.4 feet
BDU
ODU
IDU
IDU
IDU
IDU
B
B
B
B
Multi F MAX System with One Branch Distribution Unit
Multi F MAX System with Two Branch Distribution Units
Total System Pipe Length (ΣA + ΣB)
≤475.7 feet
Pipe Length
(ELF = Equivalent
Length of pipe in Feet)
Main pipe
(Outdoor Unit to Branch Distribution Units:
Σ
A)
Minimum per segment 10 feet
Maximum
≤180.4 feet
Total Branch Pipe Length (ΣB)
≤295.3 feet
Branch pipe
(Branch Distribution Units to Indoor Units:
Σ
B)
Minimum 10 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)
≤49.2 feet
Between branch distribution unit and farthest connected indoor unit(s) (h3)
≤32.8 feet
Between branch distribution units (h4)
≤49.2 feet
MULTI F PIPING SUMMARY
Multi F System
Multi F MAX System
Model
Number
Min
Length
Each
Pipe (ft.)
Maximum Piping Length to each
IDU (ft.)
Max. Total
Piping Length
for Each
System (ft.)A B C D
LMU18CHV 10 82 82 - - 164
LMU24CHV 10 82 82 82 - 246.1
LMU30CHV 10 82 82 82 82 246.1
LMU36CHV 10 82 82 82 82 246.1
Example shown: LMU36CHV outdoor unit with four (4) indoor units connected.
Example: LMU540HV outdoor unit with seven (7) indoor units, and two (2) branch distribution units connected.
A, B, C, D: Pipes from Outdoor Unit to Indoor Unit
The following are examples of manual pipe size calculations. Designers are strongly encouraged to use LATS for Multi F systems.