Selecting The Pump Stage - Wolf CGB-11 Installation Instructions Manual

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".
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 following settings are recommended:
Boiler
Central heating boiler
Central heating boiler with
cyl.
Combi boiler
- 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.
Ensure that the switch correctly clicks into place and
NB
does not remain in an intermediate position.
Select the next lower pump stage when flow noise
NB
is excessive.
Select the next higher pump stage, if individual
NB
radiators remain cold, even though their valves
are open.
30

Selecting the pump stage

Pump stage
1, 2, 3
1, 2, 3
2, 3
Pump stage selector
Fig.: Selector at the three-stage heating circuit pump
Fig.: Switching stages at the three-stage heating circuit
pump
stage 1
stage 2
stage 3
3061344_201509