Samsung RVMC060GDM0 Technical Manual page 269

Equivalent length calculation method
equivalent length = actual pipe length + number of elbows + number of elbows X equivalent length of each elbows
+ number of oil traps X equivalent length of each oil trap
Piping diameter (mm)
9.52
12.70
15.88
19.05
22.02
25.40
28.58
31.80
Examples of equivalent length calculation : When 10 horse power outdoor unit's actual length is 80 meters,
Application of equivalent length
1. When the equivalent length is more than 90% of the actually allowed piping length (more than
63 meters in five/six horse powers, 90 meters in seven/eight/ten horse powers, the gas pipe
diameter of the main piping (piping from the outdoor unit to the first bypass) is expanded a level.
For instance, when the equivalent length of 10 horse power outdoor unit is more than 100 meters,
the gas pipe diameter is changed to 31.80 from 28.58.
2. When the diameter of gas pipes is uplifted one level, the effective equivalent length is
recalculated, and the piping length is calculated based on the effective equivalent length
when looking into the graph to calculate the performance reduction by the long piping.
Effective equivalent length = equivalent length of main piping X 0.5 + equivalent length after the by path
Examples of effective equivalent length calculation : When the actual length of 10 horse power outdoor unit is 80
Type
Elbow
0.18
0.20
0.25
0.35
0.40
0.45
0.50
0.55
the piping diameter is 25.40mm, twelve elbows and two traps are used,
the equivalent length is 80+0.45X12+3.4X2 = 92.2(m)
(when the diameter of gas pipe of the main piping is uplifted a level)
meters, piping after bypass 20 meters), the diameter of gas pipe
of the main piping is 25.40 mm, twelve elbows and two oil traps
are used (elbows and oil traps are used only in main piping).
Equivalent length = 80+0.45X12+3.4X2=92.2(m)
As the equivalent length is more than 90 meters, the
diameter of gas pipe in the main piping is uplifted one level.
Effective equivalent length = (60+0.45X12+3.4X2)X0.5+20=56.1(m)
The performance loss due to the long piping is the same with
equivalent length of 56.1 meters when the diameter of gas pipes
of the main piping is not uplifted one level.
45
Oil Trap
1.3
1.5
2.0
2.4
3.0
3.4
3.7
4.0