Adjusting The Modulating Pump - Wolf CGB-75 Installation And Technical Manual

In heating mode:
The heating circuit pump (accessory) modulates in proportion to the burner output. This means at maximum burner output, the
pump operates at the maximum pump speed for heating mode. At minimum burner output, the pump operates at the minimum
pump speed for heating mode. In other words, the burner output and pump speed are regulated subject to the required heating
load. The power consumption is reduced by the pump modulation.
In DHW mode:
The heating circuit pump will not modulate, but operates constantly at the selected pump speed.
In standby mode:
The heating circuit pump will not modulate, but operates constantly at the selected pump speed.
Standby mode 20%
Setting limits:
The speed limits for heating mode can be changed with the BM programming module.
The settings in column 1 apply to control accessories ART, AWT
The settings in column 2 apply to Wolf control systems with programming module BM
1 2 Parameter
GB16 HG16 Pump rate HK, minimum
GB17 HG17 Heating circuit pump output, maximum
This parameter must be set at least 5% higher than the
parameter
Heating circuit pump output, minimum
For the minimum pump speed for heating mode, only settings in accordance with this table are permissible.
NB
Otherwise, there is a risk that the pump will not start.
In addition, the "Max. pump speed for heating mode" must be at least 5% higher than the "Minimum pump speed
for heating mode", otherwise the pump would run at 100%.
Solution:
Problem
Individual radiators are not getting properly warm.
In the spring and autumn (average outside temperature),
the required room temperature is not achieved.
When the outside temperature is extremely low, the selected
room temperature is not achieved.
28

Adjusting the modulating pump

(accessory)
Solution
Create hydraulic balancing, i.e. reduce the flow rate of
hotter radiators
Increase the set room temperature at the controller
e.g. from 20 °C to 25 °C
Select a steeper heating curve at the controller
e.g. from 1.0 to 1.2
Unit Factory min.
setting
% 20
% 100
max.
20 100
20 100
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