Mitsubishi Electric PUMY-P250YBM Technical & Service Manual page 122

Mixed Method
Connection Examples
(Connecting to 2 Branch boxes)
Total piping length
Farthest piping length (L1)
Farthest piping length. Via Branch box
Permissible Piping length between outdoor unit and branch
length boxes
(One-way)
Farthest piping length from the first joint
Farthest piping length after branch box
Total piping length between branch boxes and
indoor units
In indoor/outdoor section (H)*
Permissible
height
In branch box/indoor unit section (h1)
difference
In each branch unit (h2)
(One-way)
In each indoor unit (h3)
Number of bends
1
* Branch box should be placed within the level between the outdoor unit and indoor units.
■ Selecting the Refrigerant Branch Kit
■ Select Each Section of Refrigerant
Piping
(1) Section From Outdoor
Unit to Branch box or
Branch header (A to E)
(2) Sections From Branch
box or Branch header to
Indoor Unit (a to k)
Select the size from the table to the
right.
■ Additional refrigerant charge
OCH760
1
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 Branch box or Branch header
(Outdoor Unit Piping Diameter)
A
Model
P250
Each
Section of P300
Piping
B to E
Total down-stream capacity of indoor units
– 16.0kW
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.
(2) Refrigerant Piping Diameter In Section From Branch box or Branch header to Indoor Unit
(Indoor Unit Piping Diameter)
Indoor unit series
CITY MULTI
M series
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 Outdoor Unit
B First joint
A
C Branch header
D Branch box
L1
E CITY MULTI Indoor unit
A A
F M series Indoor unit
B
C
E
L2
B B
C C
D
D
b b c c
d e f g h
a
E E
F
F F F
E
F
A+B+C+D+E+a+b+c+d+e+f+g+h+i+j+k [ 310 m
A+E+a [ 85 m
A+B+C+k [ 80 m
A+B+C+D [ 95 m
B+C or E+a [ 30 m
k [ 25 m
d+e+f+g+h+i+j+k [ 145 m
H [ 50 m (In the case of outdoor unit is set higher than indoor unit)
H [ 40 m (In the case of outdoor unit is set lower than indoor unit)
h1+h2 [ 15 m
h2 [ 15 m
h3 [ 12 m
[ 23
Branch header (4 branches)
CMY-Y64-G-E
Liquid pipe Gas pipe
ø9.52* ø22.2
ø12.7 ø25.4
Model number Liquid pipe
10 – 50 ø6.35
63 – 140 ø9.52
200 ø9.52
250 ø9.52
15 – 42 ø6.35
50 ø6.35
122
D
i j k
F F
F
Branch header (8 branches)
CMY-Y68-G-E
(mm)
Model Liquid pipe Gas pipe
P250 ø9.52*
ø15.88
P300 ø12.7
P250 ø9.52*
ø19.05
P300 ø12.7
P250 ø9.52*
P300 ø12.7
P300 ø12.7
(mm)
Gas pipe
ø12.7
ø15.88
ø19.05
ø22.2
ø9.52
ø12.7
(mm)
ø22.2
ø25.4