Riddell's Water Pumps
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Pump 1: Typically (i) draws from the Small Main House Tank (also known as the RO Tank) and (ii) supplies toilets and outside taps. Pump 2: Typically (i) draws from the Large Main House Tank and (ii) supplies the main house kitchens and bathrooms. Pump 3: Typically (i) draws from the Cottage Tank and (ii) supplies the cottage kitchens and bathrooms (and toilet).
The red arrows are the water supply pipes from the tanks. Each has a Tap A and Tap B. These Taps determine from where the water is drawn, The Standard Option is Tap A open and Tap B closed.  In this case, the pump draws from its gerenally intended tank and supplies its specified desitantions. If a Pump's generally intedned tank is empty or has issues, the backup option is Tap A closed and Tap B open. In this case, the relevant pump will draw for both of the other tanks.
When changing Pump draw configuration, simultaneous press the up and down arrows on pump control panel to prime pump.
Pump 3 can draw from either the Large Main House tank or the Cottage tank. Pump 2 (see bleow) can also draw from either the Large Main House tank or the Cottage tank. Pump 3 can only draw from the Small Main House Tank (also known as the RO Tank).