Mitsubishi Electric City Multi PUMY-P250YBM Installation Manual page 10

4. Installing the refrigerant piping
4.1.1. Connection without Branch box (Fig. 4-1)
A+B+C+D+a+b+c+d+e [ 310 m
A
L = A+B+C+D+e [ 150 m
R= B+C+D+e [ 30 m
H [ 50 m (Outdoor lower H [ 40 m)
h [ 15 m
A
B C
a b c
B
C
C C
A
A+a+b+c+d+e+f [ 310 m
L = A+f [ 150 m, R= f [ 30 m
en
H [ 50 m (Outdoor lower H [ 40 m)
h [ 15 m
A
B
a b c d
C C
C C
4.1.2. Connection with Branch box (Fig. 4-2)
A Outdoor unit
B Branch box
C Indoor unit
c1
c2
E
D
b1
B
H
*1
a1
h1
a2 a3 a4
C C C
h3
Total piping length
Farthest piping length (L)
Permissible
Piping length between outdoor unit and branch boxes
length
(one-way)
Farthest branch box from the first joint
Farthest piping length after branch box (R)
Total piping length between branch boxes and indoor units
In indoor/outdoor section (H) *1
Permissible
In branch box / indoor unit section
height difference
(one-way)
In each branch unit (h2)
In each indoor unit (h3)
Number of bends
*1 Branch box should be placed within the level between the outdoor unit and indoor units.
9
L
R
e
D
d
C
C
L
R
Outdoor Unit
A
First Branch
B
D
Indoor unit
C
e f
Cap
D
C
C
Fig. 4-1
D The first joint
E The second joint
b3
b2
B h2
a11 a12
a5 a6 a7 a8 a9 a10
C C
C C C
Fig. 4-2
A
L [ 90 m
P250
L > 90 m
P300 All
B, C, D
Total down-stream
capacity of indoor
units
– 16.0 kW
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.
a, b, c, d, e, f
Model number
10, 15, 20, 25, 32, 40, 50
63, 71, 80, 100, 125, 140
4-Branching header
CMY-Y64-G-E
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.
L
B
R
C
C
c1 + c2 + b1 + b2 + b3 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 + a12
[ 240 m
c1 + c2 + b3 + a12 [ 80 m
c1 + c2 + b1 + b2 + b3 [ 95 m
c2 + b3 [ 30 m
a12 [ 25 m
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 + a12 [ 145 m
H [ 50 m (In case of outdoor unit is set higher than indoor unit)
H [ 40 m (In case of outdoor unit is set lower than indoor unit)
h1 + h2 [ 15 m
h2 [ 15 m
h3 [ 12 m
| c1 + b1 + a1 |, | c1 + b1 + a2 |, | c1 + b1 + a3 |, | c1 + b1 + a4 |, | c1 + b1 + a5 |, | c1 + c2 +
b2 + a6|, |c1 + c2 + b2 + a7|, |c1 + c2 + b2 + a8|, |c1 + c2 + b2 + a9|, |c1 + c2 + b2 + a10|,
|c1 + c2 + b3 + a11|, |c1 + c2 + b3 + a12| [ 23
Liquid pipe
ø9.52*
ø12.7
ø12.7
Liquid pipe
L [ 90 m ø9.52*
P250
L > 90 m ø12.7
P300 All ø12.7
L [ 90 m ø9.52*
P250
L > 90 m ø12.7
P300 All ø12.7
L [ 90 m ø9.52*
P250
L > 90 m ø12.7
P300 All ø12.7
P300 All ø12.7
Liquid pipe
ø6.35
ø9.52
200 ø9.52
250 ø9.52
Branch kit model
CMY-Y62-G-E
8-Branching header
CMY-Y68-G-E
Gas pipe
ø22.2
ø22.2
ø25.4
Gas pipe
ø15.88
ø19.05
ø22.2
ø25.4
(mm)
Gas pipe
ø12.7
ø15.88
ø19.05
ø22.2