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Selecting the pump stage
In the delivered condition, the three-stage pump is set to stage
2 (centre position).
You can select the pump stage manually.
• Check with the diagram „Residual boiler head“ in chapter
„Specification“, whether this setting is correct for your sy-
stem.
The gas fired condensing boiler is either equipped with a three-stage pump or with a modulating pump.
If a modulating pump is installed, see chapter „Modulating pump“.
- Shut down the boiler at the ON/OFF switch.
- Remove the cover lid.
- Unlock the control unit housing and pivot it out.
- At the switch, select the required pump stage.
Fig.: Switching stages at the three-stage heating circuit
pump
stage 1
stage 2
stage 3
Pump stage selector
Fig.: Selector at the three-stage heating circuit pump
The following settings are recommended:
Ensure that the switch correctly clicks into place and
does not remain in an intermediate position.
Select the next lower pump stage when flow noise
is excessive.
Select the next higher pump stage, if individual
radiators remain cold, even though their valves
are open.
NB
NB
NB
Boiler
Pump stage
Central heating boiler
1, 2, 3
Central heating boiler with
cyl.
1, 2, 3
Combi boiler
2, 3