SiEN34-705 Appendix
General Information 143
∗Note 2
3. Indoor unit to the nearest branch kit ≤
40 m
2. For calculation of Total extension
length, the actual length of above
pipes must be doubled. (except
main pipe and the pipes that are
not increased)
1. It is necessary to increase the pipe
size between the first branch kit and
the final branch kit. (Reducers must be
procured on site)
However, the pipes that are same pipe
size with main pipe must not be
increased.
Allowable length after the first refrigerant branch kit to indoor units is 40 m or less, however it can be extended up to 90 m
if all the following conditions are satisfied. (In case of “ Branch with REFNET joint ”)
∗Note 3
If the pipe size above the REFNET header is φ34.9 or more, KHRP26M73HP is required.
*If available on the site, use this size. Otherwise it can not be increased.
Required Conditions Example Drawings
4. The difference between
[Outdoor unit to the farthest indoor
unit] and [Outdoor unit to the
nearest indoor unit]
≤ 40 m
a+b×2+c×2+d×2+e×2+f×2
+g×2
+h+i+j+k+l+m+n+p≤ 1000
m
h, i, j....... p ≤ 40 m
8 b+c+d+e+f+g+p≤ 90 m
increase the pipe size of b, c, d,
e, f, g
The farthest indoor unit 8
The nearest indoor unit 1
(a+b+c+d+e+f+g+p)-(a+h)
≤ 40 m
Increase the pipe size as follows
φ 9.5 → φ12.7
φ12.7 → φ15.9
φ15.9 → φ19.1
φ19.1 → φ22.2
φ22.2 → φ25.4*
φ28.6 → φ31.8*
φ34.9 → φ38.1*
a
ABCDEFG
bcdef
g
hi j kl mn
1234567
8
H1
p
Outdoor unit
REFNET joint (A-G)
Indoor units ( 1 - 8 )
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