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CAUTION
If the indoor unit capacity exceeds the range
in the table above, select the pipe diameter
according to the manual of the indoor unit.
The size of indoor side branch pipe shall not
be larger than that of main pipe. If the size of
main pipe selected according to the above
table is larger than that of main pipe, the size
of branch pipe shall be reduced to make it the
same as that of main pipe.
Select the indoor auxiliary connection pipes (a to n)
The capacity of indoor units N1, N6, N7, N10 is
larger than 5.6kW, so indoor auxiliary connection
pipe a, f, g, j is Φ15.9/Φ9.52.
The capacity of indoor units N2 to N4 is equal or less
than 5.6kW, so indoor auxiliary connection pipe b to
d is Φ12.7/Φ6.35.
The capacity of indoor units N8 to N9 and N11 to
N13 are equal or less than 5.6kW, so indoor
auxiliary connection pipe h, i, k, l, m is Φ12.7/Φ6.35.
Select indoor main pipes L2 to L9 and indoor branch
joints B to H
The indoor units (N1 to N4) downstream of indoor
branch
joint
B
have
11.2+5.6+2.8*2=22.4kW. Refer to Table 4.7. Indoor
main pipe L2 is Φ22.2 / Φ9.52. Indoor branch joint B is
EVRI-BP2.
The indoor units (N2 to N4) downstream of indoor
branch
joint
C
have
5.6+2.8*2=11.2kW. Refer to Table 4.7. Indoor main
pipe L3 is Φ15.9 / Φ9.52. Indoor branch joint C is
EVRI-BP1.
The indoor units (N3 to N4) downstream of indoor
branch joint D have total capacity of 2.8*2 = 5.6kW.
Refer to Table 4.7. Indoor main pipe L4 is Φ15.9 / Φ
9.52. Indoor branch joint D is EVRI-BP1.
4) An Example of Refrigerant Piping Selection
The example below illustrates the piping selection
procedure for a system consisting of one outdoor unit
(22HP) and 12 indoor units. The system's equivalent
length between the farthest indoor unit and the outdoor
unit 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.
total
capacity
of
total
capacity
of
Select main pipe and indoor branch joint A
21
The indoor units (N6 and N13) downstream of indoor
branch
joint
E
have
total
14+9+7.1+5.6*3+2.8*2= 52.5kW. Refer to Table 4.7.
Indoor main pipe L5 is Φ28.6 / Φ15.9. Indoor branch
joint E is EVRI-BP3.
The indoor units (N10 to N13) downstream of indoor
branch
joint
F
have
total
7.1+5.6+2.8*2= 18.3kW. Refer to Table 4.7. Indoor main
pipe L6 is Φ19.1 / Φ9.52. Indoor branch joint F is EVRI-
BP1.
The indoor units (N11 to N13) downstream of indoor
branch
joint
G
have
total
+2.8=11.2kW. Refer to Table 4.7. Indoor main pipe L7
is Φ15.9 / Φ9.52. Indoor branch joint G is EVRI-BP1.
The indoor units (N12 to N13) downstream of indoor
branch joint H have total capacity of 2.8*2= 5.6kW. Refer
to Table 4.7. Indoor main pipe L8 is Φ15.9 / Φ 9.52.
Indoor branch joint H is EVRI-BP1.
The indoor units (N6 to N9) downstream of indoor
branch
header
have
total
+5.6*2= 34.2kW. Refer to Table 4.7. Indoor main pipe L9
is Φ28.6 / Φ12.7. Indoor branch header is 1 to 4.
The indoor units (N1 to N13) downstream of indoor
branch
joint
A
have
total
11.2+5.6+2.8*2+14+9+5.6*3+7.1+2.8*2=74.9kW.
The system's equivalent length between the farthest
indoor unit and the outdoor unit is in excess of 90m.
The total capacity of the outdoor units is 22HP. Refer
to Table 4.6 and 4.7. Main pipe L1 Refer to Table 4.6
is Φ31.8 / Φ15.9. Indoor branch joint A Refer to
Table 4.7 is EVRI-BP3.
Fig. 4.12
capacity
of
capacity
of
capacity
of
5.6+2.8
capacity
of
14
9
capacity
of
V.1
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