Mixed System; Branch Box Pipe Size; Brazing; Different-Diameter Joint - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

7-2-3. Mixed system (CITY MULTI indoor units and M series indoor units [Via Branch box])
A
A
E
C
B
b c
d
a
E E
E
E

Branch box pipe size

(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
Branch box
Port A
Port B
Port C
Port D
Port E
OCH760
A Outdoor unit
B First joint
C Branch header
D Branch box
E CITY MULTI Indoor unit
F M series Indoor unit
C D
D
e
f g h i j
E F
F F F
F
Fig. 7-4
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
A
Model Liquid pipe
P250 ø9.52*
P300 ø12.7
B, C, D, E
Total down-stream capacity
of indoor units
– 16.0 kW
16.1 kW – 22.4 kW
22.5 kW – 36.4 kW
36.5 kW –
* ø12.7 when connecting the indoor unit for PEFY-P200 or P250
a, b, c – j
Indoor unit series
CITY MULTI
M series
2-branch joint CMY-Y62-G-E
4-branch header CMY-Y64-G-E
8-branch header CMY-Y68-G-E
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
PAC-SG75RJ-E ø15.88 → ø19.05
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
27
Gas pipe
ø22.2
ø25.4
Model Liquid pipe Gas pipe
P250 ø9.52*
P300 ø12.7
P250 ø9.52*
P300 ø12.7
P250 ø9.52*
P300 ø12.7
P300 ø12.7
Model number A Liquid pipe
10 – 50 ø6.35
63 – 140 ø9.52
200 ø9.52
250 ø9.52
15 – 42 ø6.35
50 ø6.35
Diameter A
mm mm
→ ø12.7 ø9.52
→ ø9.52 ø12.7
→ ø15.88 ø12.7
→ ø9.52 ø6.35
→ ø15.88 ø9.52
ø15.88
ø15.88 *1
ø15.88 *1
the pipes on-site.
Connection method
brazing
ø15.88
ø19.05
ø22.2
ø25.4
B Gas pipe
ø12.7
ø15.88
ø19.05
ø22.2
ø9.52
ø12.7
Diameter B
mm
ø12.7
ø9.52
ø15.88
ø9.52
ø15.88
ø19.05
ø22.2 *2
ø25.4 *2