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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.)
RKOMB*AAV1H
22
28
17.8
22.6
26.2
14.8
19.1
22.0
12.7
16.4
19.0
10.6
13.7
15.9
8.3
11.0
12.7
6.4
8.3
9.6
5.4
6.9
7.0
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 RKOMB*AAV1H CH boilers are fitted with a modulating A-class pump which
modulates on the basis fo the CH power provided. The minimum and maximum
capacity of the pump can be adjusted with the parameters 3 and c. Also see par.
7.2.
The set value of parameter 3. (max. pump setting) is the percentage of the
maximum pump capacity and is linked to the set maximum CH power as set with
parameter 3
The set value of parameter c. (min. pump setting) is linked to the minimum CH-
power as set with parameter c
If the CH load modulates between the minimum and maximum value, the pump
capacity will modulate along proportionately.
Pressure loss graph unit CH side
A.
RKOMB22AAV1H
B.
RKOMB28AAV1H
C.
RKOMB33AAV1H
ROTEX Heating Systems GmbH
Settings on service display
(in % maximum rpm)
33
± 83
70
60
50
40
30
25
41
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