Mitsubishi Electric MXZ-SM36NAM2 Technical & Service Manual page 145

Branch box Method
Connection Examples
(Connecting to 8 Indoor Units)
Total piping length
Farthest piping length (L)
Permissible
length Piping length between outdoor unit and branch boxes
(One-way)
Farthest piping length after branch box (I)
Total piping length between branch boxes and indoor units
In indoor/outdoor section (H) *1
Permissible
height
difference
In branch box/indoor unit section (h1)
(One-way)
In each branch unit (h2)
In each indoor unit (h3)
Number of bends
*1 Branch box should be placed within the level between the outdoor unit and indoor units.
■ S elect Each Section of Refrigerant
Piping
(1) Section From Outdoor Unit
to Branch box (A, B, C)
(2) Sections From Branch box
to Indoor Unit (a to h)
Select the size from the table to the
right.
■ A dditional refrigerant charge
OCH810A
H H
(1) Refrigerant Piping Diameter In Section From Outdoor Unit to Branch box (Outdoor Unit Piping Diameter)
Model
MXZ-SM36/42/48
Each
Section of
Piping
MXZ-SM60
(2) Refrigerant Piping Diameter In Section From Branch box to Indoor Unit (Indoor Unit Piping Diameter)
Indoor unit series
M series or
S series
P series
When both of following bullet are satisfied gas piping diagram size shall be increased by one size.
Indoor units which connected are all of A-COIL type (PAA-A).
Total piping length is 33 ft (10 m) or less.
Refer to the constraint below and the same section in the previous page.
When connecting a PAA-series unit(s). set additional constraints on the amount of additional
refrigerant as follow.
Number of connecting PAA-A A MXZ-SM36/42/48
1 unit
2 units
3 units
145
A
L
A
C
B
B
h2 h2
C
h1
a b c f
d e
D D
D D D
D
h3
A + B + C + a + b + c + d + e + f + g + h ≤ 492 ft [150 m]
A + C + h ≤ 262 ft [80 m]
A + B + C ≤ 180 ft [55m]
l ≤ 82 ft [25 m]
a + b + c + d + e + f + g + h ≤ 312 ft [95 m]
H ≤ 164 ft [50 m]
(In the case of that outdoor unit is set higher than indoor unit)
H ≤ 131 ft [40 m]
(In the case of that outdoor unit is set lower than indoor unit)
h1 + h2 ≤ 49 ft [15 m]
h2 ≤ 49 ft [15 m]
h3 ≤ 39 ft [12 m]
≤ 15
Piping Diameter (inch[mm])
Liquid Line 3/8 [ø9.52]
Gas Line 5/8 [ø15.88]
Liquid Line 3/8 [ø9.52]
Gas Line 3/4 [ø19.05]
Model number A Liquid pipe (inch[mm]) B Gas pipe (inch[mm])
– 12
1/4 [ø6.35]
15,18
24 – 3/8 [ø9.52]
– 18 1/4 [ø6.35]
24 – 3/8 [ø9.52]
7.7 kg
27 1oz
6.7 kg
236 oz
6.7 kg
236 oz
AOutdoor unit
BBranching joint
CBranch box
DIndoor unit
C
l
g h
D
D
3/8 [ø9.52]
1/2 [ø12.7]
5/8 [ø15.88]
1/2 [ø12.7]
5/8 [ø15.88]
MXZ-SM60
11.2 kg
395 oz
10.2 kg
359 oz
9.7 kg
342 oz