Mitsubishi Electric CITY MULTI PUMY-SP140YKM Installation Manual page 8

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