Mitsubishi Electric MXZ-SM36NAM2 Technical & Service Manual page 140

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
Permissible High/
Low Difference
in Indoor/Outdoor Section
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
OCH810A
A
A
B
a
C
A+a+b+c+d ≤ 984 ft [300 m]
(L)
A+d ≤ 492 ft [150 m]
( )
d 98 ft [30 m]
The outdoor unit is upper: 164ft [50m] or less
(H) The outdoor unit is lower: 131ft [40m] or less (98ft [30,] or less if PKFY-P04/06/08/12NLMU,
PFFY-P06/08/12NEMU, and PFFY-P06/08/12NRMU are included.)
(h) 49 ft [15 m]
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
Piping
MXZ-SM36/42/48
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Liquid Line (inch [mm]) Gas Line (inch [mm])
3/8 [ø9.52]
Refer to the same section in the previous page.
L
b c
C
C
Branch header (8 branches)
CMY-Y68-G-E
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
Piping Diameter (inch [mm]) Model number
Liquid Line 3/8 [ø9.52]
18 or lower
Gas Line 5/8 [ø15.88]
5/8 [ø15.88]
140
A Outdoor Unit
B First Branch
C Indoor unit
d
C
Piping Diameter (inch [mm])
Liquid Line 1/4 [ø6.35]
Gas Line 1/2 [ø12.7]
Liquid Line 3/8 [ø9.52]
24 to 54
Gas Line 5/8 [ø15.88]