Mitsubishi Electric PUMY-P200YKM2 Technical & Service Manual page 24

7-3-2. Connection with Branch box
■ In case of using 1-branch box
Flare connection employed. (No brazing)
L
A
B
■ In case of using 2-branch boxes
2 branches pipe (joint)
: optional parts.
L
A A
A
B B
(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
Note: 3-branch type: only A, B, C unit
A B
Figure 7-2
A (Outside)
Figure 7-3
OCH675D
Branch box
B B B
Branch box #1
B B
Branch box #2
Figure 7-1
ø9.52 mm
ø19.05 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 mm
3/8 F ø9.52 mm
1/2 F ø12.7 mm
5/8 F ø15.88 mm
3/4 F
ø19.05 mm
B (Inside)
Selecting size
A
L [ 20 m ø9.52
Liquid
(mm)
L > 20 m ø12.7
Gas
B
ø19.05
(mm)
L: The farthest piping length for the main pipes from the
outdoor unit to the branch box.
• The line-up of a connectable indoor unit depends on a
district/areas/country.
■ Pipe size (Branch box–Indoor unit) Case of M series or
S series indoor unit
B
Indoor
(kW)
unit type
Liquid
Pipe size
(ømm)
Gas
■ Pipe size (Branch box–Indoor unit) Case of P series indoor unit
Indoor
(kW)
unit type
Liquid
Pipe size
(ømm)
Gas
Note: When using 35 and 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.
Different-diameter joint (optional parts) (Figure 7-2)
Connected pipes
diameter
Model name
MAC-A454JP-E ø9.52 → ø12.7
MAC-A455JP-E ø12.7 → ø9.52
MAC-A456JP-E ø12.7 → ø15.88
PAC-493PI ø6.35 → ø9.52
ø9.52 → ø15.88
PAC-SG76RJ-E
ø15.88 → ø19.05
PAC-SG75RJ-E
Different-diameter (deformed) joint (Figure 7-3)
Connected pipes
diameter
Model name
ø9.52 → ø12.7
PAC-SG78RJB-E
ø12.7 → ø9.52
PAC-SG79RJB-E
ø12.7 → ø15.88
PAC-SG80RJB-E
ø6.35 → ø9.52
PAC-SG77RJB-E
ø9.52 → ø15.88
PAC-SG76RJB-E
ø15.88 → ø19.05
PAC-SJ72RJB-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
■ Installation procedure
Refer to the installation manual of optional parts.
24
B
The piping connection size dif-
fers according to the type and
capacity of indoor units.
Match the piping connection 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 differ-
ent diameter (deformed) joints to
the branch box side. (Connect
deformed joint directly to the
branch box side.)
15 – 42
50 60
ø6.35 ø6.35 ø9.52
ø9.52 ø12.7 ø15.88 ø15.88
35 – 50 60 – 100
ø6.35 ø9.52
ø12.7 ø15.88
Diameter A Diameter B
mm mm
ø9.52 ø12.7
ø12.7 ø9.52
ø12.7 ø15.88
ø6.35 ø9.52
ø9.52 ø15.88
ø15.88 ø19.05
Outside
diameter A diameter B
mm mm
ø9.52
ø12.7
ø12.7
ø6.35
ø9.52
ø15.88
Connection method
flare
brazing
71
mm
Inside
mm
ø12.7
ø9.52
ø15.88
ø9.52
ø15.88
ø19.05