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The pump speed control can be used to change the delivered quantity - i.e. the volume
flow - of usual commercial circulating pumps in 30 steps. This provides constant levels of
(differential) temperatures in the system.
The speed control is disabled ex works. When active, it receives the signal to control from
the overriding differential switch, i.e. the basic function determined by the diagram and pro-
gram number.
Simple solar controller Solar controller with activated speed control
This simple solar diagram will now be used to show the possibilities of this process:
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