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3. Operation & Configuration
3.4 Domestic hot water systems - fully pumped system or gravity-fed system
Fully pumped Domestic Hot Water system (PUMPED)
The term for any boiler that uses a pump to move all the heat from the boiler to every part of the
system is "fully pumped". As a rule one pump is used to circulate the water through valves which
divert the flow to the relevant part of the system (central heating or domestic hot water). In this type
of system, both channels of the programmer can work independently.
Gravity-fed Domestic Hot Water system (GRAVITY)
In gravity fed hot water systems,whenever the boiler comes on to service heating, there will
inevitably be some circulation through the hot water storage tank, which will then heat up. In this
case there is no possibility to have heating without hot water, and the times for both are set using
the CH programme.
You can choose the desired system in the INSTALLERS MENU.
1
DHW
DAY/ TIME
OK
3
Press + six times
OK
5
pump/gravity
pumped
Press +/- to change setting.
OK
Press OK.
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Press the SELECT
buttons until
RUN light is lit.
Press and hold + & -
buttons together for
CH
RUN
10 seconds.
Select
2
Press OK.
OK
4
pump/gravity
pumped
Press OK to edit settings.
OK
6
DHW
CH
RUN
DAY/ TIME
Select
Press the + button twice.
The menu will exit and the the
RUN light should remain lit.
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