Mitsubishi Electric CITY MULTI PUMY-SP125VKM Installationshandbuch Seite 11

4. Installing the refrigerant piping
4.1.3-3 Selecting pipe size
System pipe size
A
A
E
C
B
L1 L3
b c
a
E E
E
Branch box pipe size
(1) Valve size for outdoor unit
Branch box
For liquid
Port A
For gas
Port B
(2) Valve size for branch box
Port C
Port D
A UNIT
Port E
B UNIT
C UNIT
D UNIT
E UNIT
* 3-branch type : only
A
Fig. 4-6
A (outside)
Fig. 4-7
A Outdoor Unit
B First joint (CMY, MSDD)
C Branch header (CMY)
·
D Branch box (PAC-MK BC(B))
E City Multi Indoor unit
F M/S/P series Indoor unit
L2
C D
D
d e
f g h i
E E F
F F F
F
ø9.52 mm
ø15.88 mm
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
Liquid pipe ø6.35 mm
Gas pipe ø9.52 mm
Liquid pipe ø6.35 mm
Gas pipe ø12.7 mm
, , unit
A B C
Conversion formula
1/4 F ø6.35
3/8 F ø9.52
1/2 F ø12.7
B
5/8 F ø15.88
3/4 F ø19.05
B (inside)
Pipe size
A, B, C, D, E
A Liquid pipe
ø9.52
L1: The farthest piping length from the outdoor unit to an indoor unit.
L2: The farthest piping length for the main pipes from the outdoor unit to the branch
box.
L3: The farthest piping length from the first joint.
a, b, c – j
Indoor unit series
City Multi
j
M series or S series
P series
* If the pipe size of indoor unit is different, use a different-diameter joint.
*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.
2-branch joint
4-branch header
8-branch header
Different-diameter joint (optional parts) (Fig. 4-6)
Connected pipes diameter
Model name
MAC-A454JP
MAC-A455JP
MAC-A456JP
PAC-493PI
PAC-SG76RJ-E
Different-diameter joint (optional parts) (Fig. 4-7)
Model name
PAC-SG78RJB-E
PAC-SG79RJB-E
PAC-SG80RJB-E
PAC-SG77RJB-E
PAC-SG76RJB-E
2-branch pipe (Joint): Optional parts (According to the connection method,
you can choose the favorite one.)
Model name
MSDD-50AR-E
MSDD-50BR-E
Branch box
Model name
PAC-MK3 BC(B)
✽
PAC-MK5 BC(B)
✽
Note: = 0, 1, 2, ....
✽
The PAC-MK31/32BC(B) and PAC-MK51/52BC(B) cannot be connected.
B Gas pipe
ø15.88
Model number A Liquid pipe
L3 [ 30m ø6.35
15 – 50
L3 ˃ 30m ø9.52*1
63 – 140 ø9.52
15 – 42 ø6.35
50 ø6.35
60 ø6.35
71, 80 ø9.52
35 – 50 ø6.35
60 – 100 ø9.52
CMY-Y62-G-E
CMY-Y64-G-E
CMY-Y68-G-E
Diameter A
mm mm
ø9.52 → ø12.7 ø9.52
ø12.7 → ø9.52 ø12.7
ø12.7 → ø15.88 ø12.7
ø6.35 → ø9.52 ø6.35
ø9.52 → ø15.88 ø9.52
Outside
Connected pipes diameter
Diameter A
mm mm
ø9.52
ø9.52 → ø12.7
ø12.7
ø12.7 → ø9.52
ø12.7
ø12.7 → ø15.88
ø6.35
ø6.35 → ø9.52
ø9.52
ø9.52 → ø15.88
Connection method
flare
brazing
Number of connected units
3-branches (Max. 3 units)
5-branches (Max. 5 units)
B Gas pipe
ø12.7
ø15.88
ø9.52
ø12.7
ø15.88
ø15.88
ø12.7
ø15.88
Diameter B
mm
ø12.7
ø9.52
ø15.88
ø9.52
ø15.88
Inside
Diameter B
mm
ø12.7
ø9.52
ø15.88
ø9.52
ø15.88
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