27
OCH675E
7-3-2. Connection with Branch box
■ When using 1-branch box
Flare connection employed. (No brazing)
■ When using 2-branch boxes
(1) Valve size of branch box for outdoor unit
For liquid
ø9.52 mm
For gas
ø15.88 mm
(2) Valve size of branch box for indoor unit
A
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
B
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
C
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
D
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
E
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø12.7 mm
Note: 3-branch type: only
A
,
B
,
C
unit
A
B
B
B
B
B
Branch box
L
A
A
A
B
B
B
B
B
Branch box #1
2 branches pipe (joint)
: optional parts.
Branch box #2
L
Figure 7-1
A
B
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
Figure 7-2
Selecting size
A
B
Liquid
(mm)
L
[
20 m ø9.52 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.)
L > 20 m
ø12.7
Gas
(mm)
ø19.05
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
Indoor
unit type
(kW)
– 42
50
60
71 –
Pipe size
(ømm)
Liquid
ø6.35
ø6.35
ø9.52
Gas
ø9.52
ø12.7 ø15.88 ø15.88
■ Pipe size (Branch box–Indoor unit) Case of P series indoor unit
Indoor
unit type
(kW)
– 50
60 –
Pipe size
(ømm)
Liquid
ø6.35
ø9.52
Gas
ø12.7
ø15.88
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)
Model name
Connected pipes
diameter
Diameter A Diameter B
mm
mm
mm
MAC-A454JP-E ø9.52 → ø12.7
ø9.52
ø12.7
MAC-A455JP-E ø12.7 → ø9.52
ø12.7
ø9.52
MAC-A456JP-E ø12.7 → ø15.88
ø12.7
ø15.88
PAC-493PI
ø6.35 → ø9.52
ø6.35
ø9.52
PAC-SG76RJ-E ø9.52 → ø15.88
ø9.52
ø15.88
PAC-SG75RJ-E ø15.88 → ø19.05
ø15.88
ø19.05
2-branch pipe (Joint): Optional parts (According to the
connection method, you can choose the favorite one.)
Model name
Connection method
MSDD-50AR-E
flare
MSDD-50BR-E
brazing
■ Installation procedure
Refer to the installation manual of optional parts.
