ROTEX Heating Systems GmbH
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7.3
Setting maximum CH power
The maximum CH power is set to 70% in the factory. If more power is required for
the CH installation, the maximum CH power can be changed by adjusting the rpm of
the fan. See table: Setting CH power.
This table shows the relation between the rpm of the fan and the unit power.
Desired CH power in kW (approx.)
Settings on service display
(in % maximum rpm)
RKOMB*AAV1
22
28
33
17.8
22.6
26.2
± 83
14.8
19.1
22.0
70
12.7
16.4
19.0
60
10.6
13.7
15.9
50
8.3
11.0
12.7
40
6.4
8.3
9.6
30
5.4
6.9
7.0
25
Caution:
The power is slowly increased when the fire is lit and is lowered when the set
leaving water temperature is reached (modulation on Ta).
7.4
Setting pump setting
The switch to set the pump setting is located on the connection box of the CH pump
(Factory setting III).
1.
Set the pump setting depending on the set maximum power and the water side
resistance of the installation. See diagram: Pressure loss of the unit and water
head of the pump, settings I, II and III. The standard setting of the pump is
setting III.
2.
Check the temperature difference between the input and return of the unit: this
should be approximately 20°C.
The minimum feed-through amount
Set power
155 l/h
5.4 kW
240 l/h
8.5 kW
510 l/h
17.8 kW
750 l/h
26.2 kW
Pressure loss graph unit CH side
A.
RKOMB22AAV1
B.
RKOMB28AAV1
C.
RKOMB33AAV1
I
Pump setting I
II
Pump setting II
III
Pump setting III
X
Feed-through amount in l/h
Y
Pressure loss / water head level in mWk
Example: At 500 l/h, the RKOMB28AAV1 has 4 mWk left over in pump setting III.
WILO RS 15/4.1
