122
OCH634C
Header-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Outdoor Unit
First Branch
Indoor unit
A
B
C
B
A
A
a
b
c
C
c
C
C
d
H
h
L
r
Permissible
Length
Total Piping Length
A+a+b+c+d
[
150 m
Farthest Piping Length (L) A+d
[
80 m
Farthest Piping Length
After First Branch
(
R
) d is 30 meters or less
Permissible
High/Low
Difference
High/Low Difference in
Indoor/Outdoor Section
(H) 50 meters or less (If the outdoor unit is lower, 40 meters or less)
High/Low Difference in
Indoor/Indoor Section
(h) 15 meters or less
■ Selecting the Refrigerant Branch Kit
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)
Branch header (8 branches)
CMY-Y64-G-E
CMY-Y68-G-E
■ Select Each Section of Refrigerant
Piping
(1) Section From Outdoor Unit
to First Branch (A)
Each
Section of
Piping
(2) Sections From Branch to
Indoor Unit (a,b,c,d)
Select the size from the table to the
right.
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch (Out-
door Unit Piping Diameter)
Note:
When connecting the CONNECTION KIT (PAC-
LV11M-J) and an M-series indoor unit, refer to
the installation manual for the CONNECTION KIT
when selecting the pipe size and piping length.
(2) Refrigerant Piping Diameter In Section
From Branch to Indoor Unit (Indoor Unit
Piping Diameter)
Model number
Piping Diameter (mm)
50 or lower
Liquid Line
ø6.35
Gas Line
ø12.7
63 to 140
Liquid Line
ø9.52
Gas Line
ø15.88
200
Liquid Line
ø9.52
Gas Line
ø19.05
■ Additional refrigerant charge
Refer to the same section in the previous page.
Model
Piping Diameter (mm)
Liquid pipe Gas pipe
L
[
60m
ø9.52
ø19.05
L > 60m
ø12.7
