| 摘要 |
<p>Control unit (7) for a domestic water supply circulation pump (6) comprises: a mass flow sensor (9) that is connected in a supply line so that it can measure a flow and give off a flow signal; a control device (10) with an output, whose level controls whether the circulation pump operates or not; and whereby the control unit changes its output level according to the mass flow measurement signal. The invention also relates to a corresponding control method in which the flow in a supply line is constantly monitored and the pump switched on as soon as the flow exceeds a threshold value. The pump is switched off after a given preset time. The pump cannot be switched on again until a given dead time has elapsed.</p> |
