mundoclima MAXI MVD V6X Engineering Data Book page 231

4.5 Refrigerant Piping Selection Example
The example below illustrates the piping selection procedure for a system consisting of three outdoor units (32HP + 22HP +
12HP) and 17 indoor units. The system's equivalent length of all liquid pipes is in excess of 90m; the piping between the
farthest indoor unit and the first indoor branch joint is less than 40m in length; and each indoor auxiliary pipe (from each
indoor unit to its nearest branch joint) is less than 10m in length.
Figure 3-4.4: Refrigerant piping selection example
W3
W2
(12)
(22)
g1 g2
M
Legend
L Main pipe
1
L to L Indoor main pipes
2 16
a to q Indoor auxiliary pipes
A to P Indoor branch joints
L, M Outdoor branch joints
g1 to g3, G Outdoor connection pipes
1
Figures in parentheses indicate indoor unit
capacity indexes.
Step 1: Select indoor auxiliary pipes
 Indoor units N
to N
1
less than 10m in length. Refer to Table 3-4.8. Indoor auxiliary pipes a to f, h to k, and m to q are Φ15.9 / Φ9.53.
 Indoor units N
and N
7
Refer to Table 3-4.8. Indoor auxiliary pipes g and l are Φ12.7 / Φ6.35.
Step 2: Select indoor main pipes and indoor branch joints B to P
 The indoor units (N
3
Table 3-4.4. Indoor main pipe L
 The indoor units (N
1
91.1kW. Refer to Table 3-4.4. Indoor main pipe L
 The other indoor main pipes and indoor branch joints are selected in the same fashion.
Step 3: Select main pipe and indoor branch joint A
 The indoor units (N
1
x 2 + 2.8 x 2 = 179.4kW. The system's equivalent length of all liquid pipes is in excess of 90m. The total capacity of the
outdoor units is 32 + 22 + 12 = 66HP. Refer to Tables 3-4.4 and 3-4.5. Main pipe L
Φ44.5 / Φ22.2, hence Φ44.5 / Φ22.2. Indoor branch joint A is FQZHN-05D.
Step 4: Select outdoor connection pipes and outdoor branch joints
 The master unit is 32HP and the slave units are 22HP and 12HP. Refer to Table 3-4.6. Outdoor connection pipes g1 is
Φ25.4 / Φ12.7, g2 is Φ31.8 / Φ15.9 and g3 is Φ38.1 / Φ19.1.
 Refer to Table 3-4.6. Outdoor connection pipe G
 There are three outdoor units in the system. Refer to Table 3-4.7. Outdoor branch joints L and M are FQZHW-03N1E.
230
W1
(32)
g3
L
2
A
L
L
1
G1
L
9
I
, N to N and N to N
6 8 11 13 17
are of capacity less than 4.5kW and their indoor auxiliary pipes are less than 10m in length.
12
and N ) downstream of indoor branch joint E have total capacity of 14 + 7.1 = 21.1kW. Refer to
4
is Φ19.1 / Φ9.53. Indoor branch joint E is FQZHN-01D.
5
to N ) downstream of indoor branch joint B have total capacity of 14 x 5 + 11.2 + 7.1 + 2.8 =
8
to N ) downstream of indoor branch joint A have total capacity of 14 x 9 + 11.2 x 2 + 7.1 x 2 + 5.6
17
C
L
3
B
F
L
6
N
9
(112)
i
L
10
L
J 11
K
L
L
15
14
O
N
n
N
15
(140)
are of capacity 5.6kW or greater and their indoor auxiliary pipes are
is Φ31.8 / Φ19.1. Indoor branch joint B is FQZHN-03D.
2
is Φ41.3 / Φ22.2.
1
N
2
N (140)
1
b
(140)
a
D
L
5
E
L
4
L
8
L
H
7
G
e
f
N
6
N
5
(140)
(112)
N
10
L
(140)
13
M
j
L
12
m
L
L
16
P
o
N
16
(56)
is the larger of Φ41.3 / Φ19.1 and
1
N
3(71)
c
d N
4(140)
g
N
7(28)
h
N
8(140)
N
11
(71)
k
N
12
l
(28)
N
13
(140)
p
N
14
(56)
q
N
17
(140)