Mitsubishi Electric City Multi PUMY-P250YBM Installation Manual page 12

4. Installing the refrigerant piping
4.1.3. Mixing system (City Multi indoor units and M series indoor units (Connection with Branch box)) (Fig. 4-6)
4.1.3-1 In case of using 1-Branch box
A
L1
e1
B
d2
C
d1
a2 a3
a1
E E
E
en Total piping length
Farthest piping length (L1)
Farthest piping length. Via Branch box (L2)
Permissible length
Piping length between outdoor unit and branch box
(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)*1
Permissible height
difference
In branch box/indoor unit section (h1)
(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.
4.1.3-2 In case of using 2-Branch boxes
A
L1
d1
B
c1
C
c2
a2 a3
a1
E E
E
Total piping length
Farthest piping length (L1)
Farthest piping length. Via branch box (L2)
Permissible length
(One-way) Piping length between outdoor unit and branch boxes
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)*1
Permissible height
difference In branch box/indoor unit section
(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.
11
L2
c1 b1
D
c2 b2
a4 a5 a6
E E F
F F
Fig. 4-6 (a)
L2
b2
b1
D
D
a4 a5 a6 a7 a8 a9
F
F
F F F
F
Fig. 4-6 (b)
A Outdoor unit
B First joint
C Branch header
D Branch box
E City Multi Indoor unit
F M series Indoor unit
a7 a8
F
F
e1 + d1 + d2 + c1 + c2 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 [ 310 m
e1 + d2 + a1 or e1 + d1 + c1 + b2 [ 85 m
e1 + d1 + c1 + b1 + a8 [ 80 m
e1 + d1 + c1 + b1 [ 80 m
d1 + c1 + b1 or d1 + c1 + b2 [ 30 m
a8 [ 25 m
a4 + a5 + a6 + a7 + a8 [ 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 [ 15 m
h3 [ 12 m
|e1 + d2 + a1|, |e1 + d2 + a2|, |e1 + d2 + a3|, |e1 + d1 + c2|, |e1 + d1 + c1 + b2|,
|e1 + d1 + c1 + b1 + a4|, |e1 + d1 + c1 + b1 + a5|, |e1 + d1 + c1 + b1 + a6|,
|e1 + d1 + c1 + b1 + a7|, |e1 + d1 + c1 + b1 + a8| [ 23
A Outdoor unit
B First joint
C Branch header
D Branch box
E City Multi Indoor unit
F M series Indoor unit
a10 a11
F
F
d1 + c1 + c2 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 [
310 m
d1 + c1 + a1 [ 85 m
d1 + c2 + b2 + a11 [ 80 m
d1 + c2 + b1 + b2 [ 95 m
c2 + b2 or c1 + a1 [ 30 m
a11 [ 25 m
a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 [ 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
|d1 + c1 + a1|, |d1 + c1 + a2|, |d1 + c1 + a3|, |d1 + c2 + b1 + a4|, |d1 + c2 + b1 + a5|,
|d1 + c2 + b1 + a6|, |d1 + c2 + b1 + a7|, |d1 + c2 + b1 + a8|, |d1 + c2 + b2 + a9|,
|d1 + c2 + b2 + a10|, |d1 + c2 + b2 + a11| [ 23