8
GB
B
A
H
B
C
L
r
D
e
a
h
b
c
d
C
C
B
A
A
A
a
b
c
d
C
D
e
f
H
h
L
r
C
C
C
C
C
C
C
C
4. Installing the refrigerant piping
A
Outdoor unit
B
First branch (CMY)
C
Indoor unit
D
Cap
A+B+C+D+a+b+c+d+e
[
120 m
L = A+B+C+D+e
[
70 m
ℓ = B+C+D+e
[
50 m
H
[
50 m (Outdoor lower H
[
30 m)
h
[
15 m
A+a+b+c+d+e+f
[
120 m
L = A+f
[
70 m, ℓ = f
[
50 m
H
[
50 m (Outdoor lower H
[
30 m)
h
[
15 m
Fig. 4-1
4.1.2. Connection with Branch box (Fig. 4-2)
Flared connections
• This unit has flared connections on each indoor unit and branch box and outdoor
unit sides.
• Remove the valve cover of the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the branch box and outdoor unit.
Fig. 4-2
B
C
B
C
C
C
C
C
C
C
L
I
h2
b2
b1
c1
a6
a5
a4
a3
a2
h3
h1
H
a1
a7 a8
D
A
A
Outdoor unit
B
Branch box (PAC-MK
∙
BC(B))
C
Indoor unit
D
First branch (MSDD)
Permissible
length
(one-way)
Total piping length
c1 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8
[
120 m
Farthest piping length (L)
c1 + b2 + a8
[
80 m (b2
[
55 m, a8
[
25 m)
Piping length between outdoor unit and branch boxes
c1 + b1 + b2
[
55 m
Farthest branch box from the first joint (b2)
b2
[
50 m
Farthest piping length after branch box (l)
a8
[
25 m
Total piping length between branch boxes and indoor units
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8
[
95 m
Permissible
height
difference
(one-way)
In indoor/outdoor section (H)*1
H
[
50 m (In case of outdoor unit is set higher than indoor unit)
H
[
30 m (In case of outdoor unit is set lower than indoor unit)
In branch box/indoor unit section (h1)
h1 + h2
[
15 m
In each branch unit (h2)
h2
[
15 m
In each indoor unit (h3)
h3
[
12 m
Number of bends
| c1 + b1 + a1 |, | c1 + b1 + a2 |, | c1 + b1 + a3 |, | c1 + b1 + a4 |, | c1 + b1 + a5 |, | c1 +
b2 + a6 |, | c1 + b2 + a7 |, | c1 + b2 + a8 |
[
15
*1 Branch box should be placed within the level between the outdoor unit and indoor units.
A
(mm)
A
Liquid pipe
B
Gas pipe
ø9.52
ø15.88
L: The farthest piping length from the outdoor unit to an indoor unit.
B, C, D
(mm)
A
Liquid pipe
B
Gas pipe
ø9.52
ø15.88
L: The farthest piping length from the outdoor unit to an indoor unit.
a, b, c, d, e, f
(mm)
D
Model number
A
Liquid pipe
B
Gas pipe
15, 20, 25, 32, 40, 50
a, b, c, d, e, f
[
30 m
ø6.35
ø12.7
a, b, c, d, e, f ˃ 30 m
ø9.52*1
63, 71, 80, 100, 125, 140
ø9.52
ø15.88
*1 If the piping length after the first joint exceeds 30 m, use a pipe size of ø9.52 for
the pipes of the system that exceeds 30 m.
E
Branch kit model
CMY-Y62-G-E
F
4-Branching header
G
8-Branching header
CMY-Y64-G-E
CMY-Y68-G-E
* 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.
4.1.1. Connection without Branch box (Fig. 4-1)
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