Mitsubishi Electric CITY MULTI PUMY-SP125VKM Installationshandbuch Seite 9

4. Installing the refrigerant piping
■ In case of using 1-branch box
Flare connection employed. (No. brazing)
A
B
■ In case of using 2-branch boxes
L
2 branches pipe (joint) (MSDD)
: optional parts.
A A
A
B B
Branch box #2 (PAC-MK∙BC(B))
Fig. 4-3
(1) Valve size for outdoor unit
For liquid
For gas
(2) Valve size for branch box
Liquid pipe
A UNIT
Gas pipe
Liquid pipe
B UNIT
Gas pipe
Liquid pipe
C UNIT
Gas pipe
Liquid pipe
D UNIT
Gas pipe
Liquid pipe
E UNIT
Gas pipe
* 3-branch type : only , , unit
A B C
A
Fig. 4-4
A (outside)
Fig. 4-5
L
Branch box (PAC-MK∙BC(B))
B B B
Branch box #1 (PAC-MK∙BC(B))
B B
ø9.52 mm
ø15.88 mm
ø6.35 mm
ø9.52 mm
ø6.35 mm
ø9.52 mm
ø6.35 mm
ø9.52 mm
ø6.35 mm
ø9.52 mm
ø6.35 mm
ø12.7 mm
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)
Selecting pipe size (Fig. 4-3)
A
The piping connection size differs according to the type
and capacity of indoor units. Match the piping connec-
Liquid (mm) ø9.52
tion size of branch box with indoor unit.
If the piping connection size of branch box does not
match the piping connection size of indoor unit, use
optional different-diameter (deformed) joints to the
Gas (mm) ø15.88
branch box side. (Connect deformed joint directly to
the branch box side.)
B
L: The farthest piping length for the main pipes from the outdoor unit to the branch
box.
Different-diameter joint (optional parts) (Fig. 4-4)
Connected pipes diameter
Model name
MAC-A454JP ø9.52 → ø12.7
MAC-A455JP ø12.7 → ø9.52
MAC-A456JP ø12.7 → ø15.88
PAC-493PI ø6.35 → ø9.52
PAC-SG76RJ-E ø9.52 → ø15.88
Different-diameter joint (optional parts) (Fig. 4-5)
B
Connected pipes diameter
Model name
PAC-SG78RJB-E
ø9.52 → ø12.7
PAC-SG79RJB-E
ø12.7 → ø9.52
PAC-SG80RJB-E
ø12.7 → ø15.88
PAC-SG77RJB-E
ø6.35 → ø9.52
PAC-SG76RJB-E
ø9.52 → ø15.88
2-branches pipe (Joint) : Optional parts (According to the connection method,
you can choose the favorite one.)
Model name
MSDD-50AR-E
MSDD-50BR-E
■ Installation procedure (2 branches pipe (Joint))
Refer to the installation manuals of MSDD-50AR-E.
■ Pipe size (Outdoor unit-Branch box)
Liquid
Pipe size
(ømm)
Gas
The lineup of a connectable indoor unit depends on a district/areas/
country.
■ Branch box
Model name Number of connected units
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.
■ Pipe size (Branch box–Indoor unit) Case of M series or S series indoor unit
Indoor
(kW)
unit type
Liquid
Pipe size
(ømm)
Gas
* If the pipe size of indoor unit is different, use a different-diameter joint.
■ Pipe size (Branch box–Indoor unit) Case of P series indoor unit
Indoor
(kW)
unit type
Liquid
Pipe size
(ømm)
Gas
*1 The lineup of a connectable indoor unit depends on a district/areas/
country.
*2 When using 35, 50 type indoor unit of P series, use the flare nut attached
to the indoor unit.
Do not use the flare nut in the indoor unit accessory. If it is used, a gas
leakage or even a pipe extraction may occur.
B
Diameter A
mm mm
ø9.52
ø12.7
ø12.7
ø6.35
ø9.52
Outside
Diameter A
mm mm
ø9.52
ø12.7
ø12.7
ø6.35
ø9.52
Connection method
flare
brazing
ø9.52
ø15.88
3-branches (Max. 3 units)
5-branches (Max. 5 units)
15 – 42 50 60
ø6.35 ø6.35
ø9.52 ø12.7 ø15.88
35 – 50 60 – 100
ø6.35 ø9.52
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
71 – 80
ø9.52
ø15.88
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