. Installation
Λ
8. Piping and refnet joint selection
42
ΛΛ
Outdoor unit
8-3. Limitation when piping is installed by using only Refnet joint
(during six rooms installation)
Max.
allowable
length
Distance of the
remotest indoor unit
from the outdoor unit
Actual length
(m)
Equivalent
length (m)
✻
1)
Max.
allowable
height
difference
Height difference between outdoor unit
and indoor unit (m) = H1(the figures in the
parenthesis is applied when the outdoor
unit is installed below the indoor unit)
Height difference between indoor unit = H2
Allowable length after branching
The distance from the first refnet joint to the indoor unit :
shorter than 30m ex) b+c+d+e+f ≤ 30m, b+c+i ≤ 30m
The distance between the max piping and min piping length
from 1 refnet joint ≤ 20m
ex) In case of 10 horse power a+b+c+d+e+f ≤ 100m
ex) In case of 10 horse power ≤ 125m
15m
70
87
30 (30)
100
125
50 (40)
6.0HP5.0HP
Item
Outdoor unit
7.0/7.5HP 8.0/10.0HP
✻ 1) Equivalent length means a calculated value of the actual length plus pressure loss caused by piping curve.
For instance, the equivalent in the case of 10 horse power should be 125 meters (The detailed calculation
of equivalent length should be referenced in page V-43).
DVM TM(chapter5-2)_E<03759 6/14/02 2:22 PM Page 42
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