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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 total piping length 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
N
1
(140)
N
4(140)
N
9
(112)
N
10
(140)
N
12
(28)
N
13
(140)
N
16
(56)
N
15
(140)
N
3(71)
N
7(28)
N
6
(140)
N
8(140)
N
14
(56)
N
17
(140)
A
B
I
J
N
K
O
C
F
H
E
L
1
L
2
L
3
L
5
L
7
L
8
L
11
L
12
L
13
L
15
L
14
L
16
L
9
a
c
d
f
g
h
j
l
m
n
o
p
q
k
M
L
g1 g2
g3
G1
D
N
2
(140)
b
L
4
N
5
(112)
G
L
6
e
N
11
(71)
i
L
L
10
M
P
W3
(12)
W2
(22)
W1
(32)
Step 1: Select indoor auxiliary pipes
▪ Indoor units N
1
to N
6
, N
8
to N
11
and N
13
to N
17
are of capacity 5.6kW or greater and their indoor auxiliary pipesare less
than 10m in length. Refer to Table 3-4.8. Indoor auxiliary pipes a to KS(E)F, h to k, and m to q are Φ15.9 / Φ9.53.
▪ Indoor units N
7
and N
12
are of capacity less than 4.5kW and their indoor auxiliary pipesare less than 10m in length.
Refer to Table 3-4.8. Indoor auxiliary pipes KAYF 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
and N
4
) downstream of indoor branch joint E have total capacity of 14 + 7.1 = 21.1kW. Refer to
Table 3-4.4. Indoor main pipe L
5
is Φ19.1 / Φ9.53. Indoor branch joint E is KCMI112.
▪ The indoor units (N
1
to N
8
) downstream of indoor branch joint B have total capacity of 14 x 5 + 11.2 + 7.1 + 2.8 =
91.1kW. Refer to Table 3-4.4. Indoor main pipe L
2
is Φ41.3 / Φ19.1. Indoor branch joint B is KCMI412.
▪ 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 (N1 to N17) downstream of indoor branch joint A have total capacity of 14 x 9 + 11.2 x 2 + 7.1
x 2 + 5.6 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 L1 is the larger of
Φ41.3 / Φ19.1 and Φ44.5 / Φ22.2, hence Φ44.5 / Φ22.2. Indoor branch joint A is KCMI512.
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 G1 is Φ41.3 / Φ22.2.
▪ There are three outdoor units in the system. Refer to Table 3-4.7. Outdoor branch joints L and M are KCME-13.6.
Legend
L
1
Main pipe
L
2
to L
16
Indoor main pipes
a to q Indoor auxiliary pipes
A to P Indoor branch joints
L, M Outdoor branch joints
g1 to g3, G
1
Outdoor connection pipes
Figures in parentheses indicate indoor unit
capacity indexes.