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4. Dimensions and required servicing space of Branch Box
Optional different-diameter (deformed) joints
A
A (outside)
Connected pipes diameter
Model name
3/8, ø9.52 → 1/2, ø12.7
MAC-A454JP-E
1/2, ø12.7 → 3/8, ø9.52
MAC-A455JP-E
1/2, ø12.7 → 5/8, ø15.88
MAC-A456JP-E
1/4, ø6.35 → 3/8, ø9.52
PAC-493PI
3/8, ø9.52 → 5/8, ø15.88
PAC-SG76RJ-E
5/8, ø15.88 → 3/4, ø19.05
PAC-SG75RJ-E
PAC-MKA53BC (5-branches type)
17-23/32
2-9/16
E
D
C
B
E
D
C
B
1
1
1
1
1
2-3/4
2-3/4 2-3/4 2-3/4
en
3
B
Fig. 4-1
B (inside)
Fig. 4-2
Diameter A
in, mm
in, mm
3/8, ø9.52
1/2, ø12.7
1/2, ø12.7
1/4, ø6.35
3/8, ø9.52
5/8, ø15.88
A
12-19/32
B
C
3-17/32
3-25/32
11-1/32
2-27/32
3-9/32
3-7/16 2-3/4
A
A
D
Fig. 4-3
* Please connect 2 indoor units or more with 1 system.
* Up to 2 branch boxes may be connected to 1 outdoor unit.
* Suspension bolt : W3/8 (M10)
* Refrigerant pipe flared connection
* The piping connection size differs according to the type and capacity of
indoor units. Match the piping connection size for indoor unit and branch
box. If the piping connection size of branch box does not match the
piping connection size of indoor unit, use optional different-diameter (de-
formed) joints to the branch box side. (Connect deformed joint directly to
the branch box side.)
Caution:
Be sure to use the insulation of specified thickness. Excessive thickness
may cause incorrect installation of the indoor unit and branch box, and lack
of thickness may cause dew drippage.
2-branch pipe (Joint) : Optional parts (According to the connection method,
Diameter B
you can choose the favorite one.)
in, mm
Model name
1/2, ø12.7
MSDD-50AR-E
3/8, ø9.52
MSDD-50BR-E
5/8, ø15.88
3/8, ø9.52
Installation procedure (2 branch pipe (Joint))
5/8, ø15.88
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.
3/4, ø19.05
A Suspension bolt pitch
B To indoor unit
C To outdoor unit
D Service panel
E Electric cover
F Conduit plate
G Terminal block (to indoor unit on Controller board)
H Terminal block (to outdoor unit)
J Terminal block (for comunication cable)
PAC-MKA53BC (Fig. 4-3)
(in)
Suspension bolt: W3/8 (M10)
Refrigerant pipe flared connection
Liquid pipe 1/4, ø6.35 1/4, ø6.35 1/4, ø6.35 1/4, ø6.35 1/4, ø6.35
Gas pipe 3/8, ø9.52 3/8, ø9.52 3/8, ø9.52 3/8, ø9.52 1/2, ø12.7
1/2
1-17/32
J
G
F
H
E
To indoor unit
A
B
C
D
Conversion formula
1/4 F
ø6.35
3/8 F
ø9.52
1/2 F
ø12.7
5/8 F
ø15.88
3/4 F
ø19.05
Connection method
flare
brazing
in, mm
To outdoor unit
E
3/8, ø9.52
5/8, ø15.88
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