Mitsubishi Electric CITY MULTI PUMY-P Series Installation Manual page 10

4. Installing the refrigerant piping
4.2.3. Mixed system (City Multi indoor units and M, S, P series indoor units via Branch box) (Fig. 4-3)
1. In case of using 1-Branch boxes
A
L1
B
d2
C
a2 a3
a1
E E
E
Permissible
Total piping length
length (One-way)
Farthest piping length (L1)
Farthest piping length. Via Branch box (L2)
Piping length between outdoor unit and branch box
Farthest piping length from the first joint
Farthest piping length after branch box
Total piping length between branch boxes and indoor units
Permissible
In indoor/outdoor section (H) *2
height difference
(One-way)
In branch box/indoor unit section (h1)
In each indoor unit (h3)
Number of bends
*2: Branch box should be placed within the level between the outdoor unit and indoor units.
*3: When a Cylinder unit or Hydrobox unit is connected, the maximum piping length is 150 m.
2. In case of using 2-Branch boxes
A
L1
d1
B
c1
C
c2
a2 a3
a1
E E
E
Permissible
Total piping length
length (One-way)
Farthest piping length (L1)
Farthest piping length. Via Branch box (L2)
Piping length between outdoor unit and branch boxes
Farthest piping length from the first joint
Farthest piping length after branch box
Farthest branch box from outdoor unit
en
Total piping length between branch boxes and indoor units a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 [ 95 m
Permissible
In indoor/outdoor section (H) *2
height difference
(One-way)
In branch box/indoor unit section (h1+h2)
In each branch unit (h1)
In each indoor unit (h3)
Number of bends
*2: Branch box should be placed within the level between the outdoor unit and indoor units.
*3: When a Cylinder unit or Hydrobox unit is connected, the maximum piping length is 150 m.
8
L2
e1
d1
c1 b1
D
c2 b2
a4 a5 a6
E E F
F F
Fig. 4-3 (a)
L2
b2
b1
D
D
a4 a5 a6 a7 a8 a9
F
F
F F F
F
Fig. 4-3 (b)
A Outdoor Unit
B First joint
C Branch header
D Branch box
E CityMulti Indoor unit*
a7 a8
F M, S, P series Indoor unit, Cylinder unit or Hydrobox unit
* PKFY-P·VBM, PKFY-P10 – 32VLM, PFFY-P·VKM, PFFY-P·VCM, and PFFY-P·VL8 type indoor
F
F
units cannot be used in a mixed system.
e1 + d1 + d2 + c1 + c2 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 [ 300 m *3
e1 + d2 + a1 or e1 + d1 + c1 + b2 [ 85 m
e1 + d1 + c1 + b1 + a8 [ 80 m
e1 + d1 + c1 + b1 [ 55 m
d1 + c1 + b1, d1 + c1 + b2, d1 + c2 or d2 + a1 [ 30 m
a8 [ 25 m
a4 + a5 + a6 + a7 + a8 [ 95 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| [ 15
A Outdoor Unit
B First joint
C Branch header
D Branch box
a10 a11
E CityMulti Indoor unit*
F
F M, S, P series Indoor unit, Cylinder unit or Hydrobox unit
* PKFY-P·VBM, PKFY-P10 – 32VLM, PFFY-P·VKM, PFFY-P·VCM, and PFFY-P·VL8 type indoor
F
units cannot be used in a mixed system.
d1 + c1 + c2 + b1 + b2 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 [ 240 m *3
d1 + c1 + a1 [ 85 m
d1 + c2 + b2 + a11 [ 80 m
d1 + c2 + b1 + b2 [ 55 m
c2 + b2 or c1 + a1 [ 30 m
a11 [ 25 m
d1 + c2 + b2 [ 55 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| [ 15