5 Before installation
Combi 2
25
5.3 Flow rate/head at the plate characteristics
Fig.11 Graph of flow rate/head at the plate
BO-0000226
Tab.17 Description of graph of flow rate/head at the plate
Q Flow volume
h Dynamic head
85 % Minimum modulation value in heating mode
100% Maximum value in heating mode
To prevent flow noise, you must pay attention to the hydraulic design of
the heating installation.
The system uses a high-head, modulating pump that is suitable for use on
any type of one- or two-pipe heating system. The automatic air vent valve
built into the pump body enables fast venting of the heating system.
Operation of the pump in DHW mode —> 100% fixed.
Operation of the pump in heating mode —> modulating by 85% to 100% .
Important
The relief valve must never be used to drain the system.
A remote relief valve kit is available to enable the boiler to be installed in
cellars or similar locations below outside ground level.
A boiler discharge pump is available which will dispose of both condensate
& high temperature water from the relief valve. It has a maximum head of
5 metres.
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