53
8.5 Adjusting maximum central heating output
8.6 Adjusting pump capacity
The maximum central heating output is factory-set. If more
or less output is needed for the central heating system, the
maximum central heating output can be modified with
parameter P010. See the table below:
Setting central heating output.
The Xtremehas a modulating pump that modulates that
modulates based on the central heating output provided. The
minimum and maximum capacity of the pump can be adjusted
with the parameters P031 and P032. Also see §8.3.
The set value of parameter P031 (max. pump setting) is the
percentage of the maximum pump capacity and is linked to
the set maximum central heating output which is set with
parameter P010.
The set value of parameter P032 (min. pump setting) is linked
to the minimum central heating output.
The pump capacity must be set such that the temperature
dierence between the supply and return fits with the system.
If the central heating load modulates between the minimum
and maximum value, the pump capacity will modulate along
proportionately.
Pressure loss graph boiler central heating side
A. Xtreme 24
B. Xtreme 30
C. Xtreme 36
8.4 Switching DHW comfort function on and o
It is possible to switch on and o the DHW comfort function
from an OpenTherm room thermostat (provided the
thermostat supports this function). To do this, the boiler must
be set at the ‘eco’ setting and the parameter P074 must be
set to 0. The self-learning character of the control is therefore
switched o.
P010
Desired central heating
output in kW (approx.)
Minimum flow
quantity (l/h)
Xtreme
24 30 36 24 30 36
100 13,8 19,4 25,7 396 557 738
75 10,6 14,6 19,3 304 419 553
50 7,3 9,8 12,8 210 281 369
35 5,4 7,0 9,0 155 201 258
25 - 5,1 6,4 - 146 184
Note:
The output during combustion will be slowly increased and decreased
as soon as the set flow temperature is achieved (modulation on T
flow
).
25%
50%
75%
100%
1
0
2
3
4
5
6
7
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