Mitsubishi Electric PUMY-P250YBM Technical & Service Manual page 119

Method of Combined Branching of
Lines and Headers
Connection Examples
(Connecting to 5 Indoor Units)
Permissible Total Piping Length
Length
Farthest Piping Length
Farthest Piping Length
After First Branch
Permissible High/Low Difference in
Indoor/Outdoor Section
High/Low
Difference
High/Low Difference in
Indoor/Indoor Section
■ Selecting the Refrigerant Branch Kit
■ Select Each Section of Refrigerant
Piping
(1) Section From Outdoor
Unit to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d,e)
(3) Section From Branch to
Branch (B,C)
Select the size from the table to the
right.
■ Additional refrigerant charge
OCH760
A+B+C+a+b+c+d+e [ 310m
(L) A+B+b [ 150m
B+b [ 30m
(R)
H [ 50 m (If the outdoor unit is lower, H [ 40 m)
(H)
h [ 15 m
(h)
Please select branching kit, which is sold separately, from the table below.
(The kit comprises sets for use with liquid pipes and for use with gas pipes.)
Branch Joint
CMY-Y62-G-E
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
A
Each
Model
Section of
L [ 90 m
Piping
P250
L > 90 m
P300 All
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
B, C, D
Total down-stream capacity of indoor units Liquid pipe
– 16.0kW
16.1 – 22.4 kW
22.5 – 36.4 kW
36.5 kW –
L: The farthest piping length from the outdoor unit to an indoor unit.
* ø12.7 when connecting the indoor unit for PEFY-P200 or P250.
Note: When connecting the CONNECTION KIT (PAC-LV11M-J) and an M-series indoor unit,
refer to the installation manual for the CONNECTION KIT when selecting the pipe size and
piping length.
Refer to the same section in the previous page.
A
Note: Pipe re-branching after the header branching
is not possible.
A
C
B
c d
3 4
B
D D
L
R
b
a 2
C
D
1
Branch header (4 branches)
CMY-Y64-G-E
(2) Refrigerant Piping Diameter In Section
(mm)
Liquid pipe Gas pipe
ø9.52* ø22.2
ø12.7 ø22.2
ø12.7 ø25.4
L [ 90 m ø9.52*
P250
L > 90m ø12.7
All
P300 ø12.7
L [ 90 m ø9.52*
P250
L > 90m ø12.7
All
P300 ø12.7
L [ 90 m ø9.52*
P250
L > 90m ø12.7
All
P300 ø12.7
All
P300 ø12.7
119
E
F
A Outdoor unit
e
B First branching (branching joint)
5
D
C Branching joint
D Indoor unit
E Branching header
F Blind caps
D
Branch header (8 branches)
CMY-Y68-G-E
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
a, b, c, d, e
Model number Liquid pipe
10 – 50 ø6.35
63 – 140 ø9.52
200 ø9.52
250 ø9.52
(mm)
Gas pipe
ø15.88
ø19.05
ø22.2
ø25.4
(mm)
Gas pipe
ø12.7
ø15.88
ø19.05
ø22.2