Selecting The Pump Stage / Bypass - Wolf CGU-2-18 Installation And Maintenance Instructions Manual

Selecting the pump stage / bypass

The boiler is equipped with a three-stage pump that is
set to stage 2 in the delivered condition.
Stage 1
Stage 2
Stage 3
Fig.: Pump rate stages at the heating circuit pump
The minimum circulation volume is ensured by a
connection line between the flow and return. An
automatic overflow valve and a manually adjustable
bypass valve are integrated into the connection line.
In the delivered condition, the bypass valve is fully
opened to "MAX".
Closing the valve can increase the residual head.
(see "Selecting the pump stage / bypass").
Bypass valve
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