Mitsubishi Electric SMART MULTI MXZ-SM36NAM2-U1 Data Book page 76

11. PIPING DESIGN
Header-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Total Piping Length
Permissible
Farthest Piping Length
Length
Farthest Piping Length After First Branch
High/Low Difference in Indoor/Outdoor Section
Permissible High/
Low Difference
High/Low Difference in Indoor/Indoor Section
Selecting the Refrigerant Branch Kit
Select Each Section of Refrigerant Piping
(1) Section From Outdoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d)
Select the size from the table to the right.
Additional refrigerant charge
M-P0890
A
A
B
a
C
A + a + b + c + d
(L)
A + d 130 m [426 ft]
( )
d 30 m [98 ft]
(H) H 50 m [164 ft] (If the outdoor unit is lower, H
(h)
h 15 m [49 ft]
Please select branching kit, which is sold separately, from the table below.
(The kit comprises sets for use with liquid pipes and for use with gas pipes.)
Branch header (4 branches)
CMY-Y64-G-E
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
Each
Model
Section of
MXZ-SM72
Piping
MXZ-SM96
MXZ-SM120
* ø12.7 [1/2] when connecting the indoor unit for PEFY-P72 or P96.
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
04, 05, 06, 08, 12, 15, 18
24, 27, 30, 36, 48, 54
Refer to "11-3. Refrigerant charging calculation".
L
b c
C
C
310 m [1016 ft]
Branch header (8 branches)
CMY-Y68-G-E
Liquid pipe
All ø9.52 [3/8]*
L 90 m [295 ft]
ø9.52 [3/8]*
L > 90 m [295 ft]
ø12.7 [1/2]
All
ø12.7 [1/2]
Model number Liquid pipe
ø6.35 [1/4]
ø9.52 [3/8]
72 ø9.52 [3/8]
96 ø9.52 [3/8]
SMART MULTI
A: Outdoor Unit
B: First Branch
C: Indoor unit
d
C
40 m [131 ft])
mm [in]
Gas pipe
ø22.2 [7/8]
ø22.2 [7/8]
ø28.58 [1-1/8]
mm [in]
Gas pipe
ø12.7 [1/2]
ø15.88 [5/8]
ø19.05 [3/4]
ø22.2 [7/8]
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