INsTALLATIoN
Commissioning
66
| WWK 221-301 electronic
www.stiebel-eltron.com
Standard system with 5 m air duct (DN 200) and two 90° bends
Length or
pce
Pressure drop per
m or per pce [Pa]
Pressure
drop [Pa]
Folded spiral-seam tube
5
0.67
3.35
90° bend (r = 1 * d)
2
2.3
4.6
Intake grille
2
6.2
12.4
Total
20.35
f
f
Set the fan output to 44 % in the controller menu.
Note
If the air duct is longer or there are more bends, perform
the following individual system calculation.
Individual system calculation
f
f
Calculate the system pressure drop as the sum of all compo-
nents installed in the air duct.
f
f
Enter the calculated pressure drop on the X-axis of the dia-
gram. Read off the fan output from the Y-axis and adjust the
fan output parameter in the appliance menu.
Example 1 : Air duct diameter DN 160
Length or
pce
Pressure drop per
m or per pce [Pa]
Pressure
drop [Pa]
Folded spiral-seam tube
10
2
20
90° bend (r = 1.5 * d)
0
4.5
0
90° bend (r = 1 * d)
3
5.5
16.5
Intake grille
2
6.2
12.4
Total
48.9
Example 2 : Air duct diameter DN 200
Length or
pce
Pressure drop per
m or per pce [Pa]
Pressure
drop [Pa]
Folded spiral-seam tube
20
0.67
13.4
90° bend (r = 1.5 * d)
0
2.0
0
90° bend (r = 1 * d)
2
2.3
4.6
Intake grille
2
6.2
12.4
Intake expansion
1
5
5
Discharge reduction
1
2.8
2.8
Total
38.2
Table for your system
Length or
pce
Pressure drop per
m or per pce [Pa]
Pressure
drop [Pa]
Fan graph with examples showing how to calculate the necessary fan setting with a duct connection
35
40
45
50
55
60
65
0
10
20
30
40
50
60
70
80
90
100
D
00000
45
29
4
1
Example 2
Example 1
X Pressure drop [Pa]
Y Fan setting [%]
1 Fan curve