Connection With Branch Box; In Case Of Using 1-Branch Box; In Case Of Using 2-Branch Boxes; In Case Of Using 3-Branch Boxes - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

7-2-2. Connection with Branch box

In case of using 1-branch box

Flare connection employed. (No. brazing)
A
C

In case of using 2-branch boxes

2 branches pipe (joint)
: optional parts.
A B
B
C C

In case of using 3-branch boxes

2 branches pipe (joint)
: optional parts.
A A
B
C C C
Branch box #3
(1) Valve size of branch box for outdoor unit
For liquid
For gas
(2) Valve size of branch box for indoor unit
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 A, B, C unit
A
Fig. 7-2
A (outside)
Fig. 7-3
OCH760
Branch box
C C C
Branch box #1
C C
Branch box #2
Branch box #1
B B
C C C
Branch box #2
Fig. 7-1
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
5/8 F ø15.88
B
3/4 F ø19.05
7/8 F ø22.2
1 F ø25.4
B (inside)
Selecting pipe size (Fig. 7-1)
A
Model Liquid pipe
P250 ø9.52
P300 ø12.7
B
C
Total down-stream capacity
of indoor units
– 16.0 kW
16.1 kW – 22.4 kW
22.5 kW –
C
The piping connection size differs according to the type and capacity of indoor units.
Match the piping connection size of branch box with indoor unit.
C
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 branch
box side.
(Connect deformed joint directly to the branch box side.)
Different-diameter joint (optional parts) (Fig. 7-2, 7-3)
Connected pipes diameter
Model name
MAC-A454JP ø9.52
MAC-A455JP ø12.7
MAC-A456JP ø12.7
PAC-493PI ø6.35
PAC-SG76RJ-E ø9.52
C
PAC-SG75RJ-E ø15.88 →
PAC-SG71RJ-E ø15.88 *1 → ø22.2 *2
PAC-SG77RJ-E ø15.88 *1 → ø25.4 *2
*1 When connecting to MSDD-50AR-E or a branch box,
Use the nuts that are included with the 2-branch pipe and branch box.
*2 Brazing
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 (2 branches pipe (Joint))
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.
The lineup of a connectable indoor unit depends on the
district/area/country.
Pipe size (Branch box-Indoor unit) *Case of M series Indoor unit
Indoor unit
(kW) 15
type
Liquid ø6.35
Pipe size
(mm)
Gas ø9.52
26
Gas pipe
ø22.2
ø25.4
Model Liquid pipe Gas pipe
P250 ø9.52
ø15.88
P300 ø12.7
P250 ø9.52
ø19.05
P300 ø12.7
P250 ø9.52
ø22.2
P300 ø12.7
Diameter A Diameter B
mm mm
→ ø12.7 ø9.52
→ ø9.52 ø12.7
→ ø15.88 ø12.7
→ ø9.52 ø6.35
→ ø15.88 ø9.52
ø19.05 ø15.88
ø15.88 *1
ø15.88 *1
the pipes on-site.
Connection method
brazing
20 22 25 35 42
ø6.35 ø6.35 ø6.35 ø6.35 ø6.35
ø9.52 ø9.52 ø9.52 ø9.52 ø9.52
mm
ø12.7
ø9.52
ø15.88
ø9.52
ø15.88
ø19.05
ø22.2 *2
ø25.4 *2
50
ø6.35
ø12.7