Mitsubishi Electric SMART MULTI MXZ-SM36NAM2-U1 Data Book page 77

11. PIPING DESIGN
Method of Combined Branching of Lines and
Headers
Connection Examples
(Connecting to 5 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,e)
(3) Section From Branch to
Branch (B,C)
Select the size from the table to the right.
Additional refrigerant charge
M-P0890
A
Note: Pipe re-branching after the header branching
A
B
A + B + C + a + b + c + d + e
(L)
A + B + b 130 m [426 ft]
( )
B + b 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 Joint
CMY-Y62-G-E
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
Model
Each
MXZ-SM72
Section of
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
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Total down-stream
capacity of indoor
units
– 54 kBtu/h
54 – 76 kBtu/h
76 – 124 kBtu/h
124 kBtu/h –
L: The farthest piping length from the outdoor unit to an indoor unit.
* ø12.7 [1/2] when connecting the indoor unit for PEFY-P72 or P96.
Refer to "11-3. Refrigerant charging calculation" .
is not possible.
C
c
d
3 4
B
D D
L
b
a
2
C
D
1
310 m [1016 ft]
Branch Header (4 branches)
CMY-Y64-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]
Model Liquid pipe
MXZ-SM72
All
L 90 m [295 ft] ø9.52 [3/8]
MXZ-SM96
L > 90 m [295 ft] ø12.7 [1/2]
MXZ-SM120 All
MXZ-SM72 All
L 90 m [295 ft] ø9.52 [3/8]*
MXZ-SM96
L > 90 m [295 ft]
MXZ-SM120 All
MXZ-SM72 All
L 90 m [295 ft]
MXZ-SM96
L > 90 m [295 ft]
MXZ-SM120 All
MXZ-SM120 All
SMART MULTI
E
F
e
5
A: Outdoor unit
D
B: First branching (branching
joint)
C: Branching joint
D: Indoor unit
E: Branching header
D
F: Blind caps
40 m [131 ft])
Branch Header (8 branches)
CMY-Y68-G-E
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]
Gas pipe
ø9.52 [3/8]
ø15.88 [5/8]
ø12.7 [1/2]
ø9.52 [3/8]*
ø19.05 [3/4]
ø12.7 [1/2]
ø12.7 [1/2]
ø9.52 [3/8]*
ø9.52 [3/8]*
ø22.2 [7/8]
ø12.7 [1/2]
ø12.7 [1/2]
ø12.7 [1/2] ø28.58 [1-1/8]
75