Application
In addition to the drinking water supply, rainwater takes an increasing part in domestic water supply systems, thus saving money and helping to protect the environment. For example, rainwater can be used for the following needs:
Washing clothes
Watering the garden
Watering indoor plants
Washing the car
Flushing the toilet
Rainwater can be collected in a suitable system to be used instead of drinking water.
Description of the system
The rainwater is collected in a reservoir. From the reservoir, it is pumped into a respective water supply system. From there it can be tapped in the same way as drinking water. The system functions can be upheld by supplying drinking water if the reservoir runs out of service water.
A control circuit is to be created that suits the requirements for such an installation.
The sketch below illustrates how such a service water system works:
Requirements on the control system
Service water must be available at all times. An emergency control system must change over to drinking water supply, for example, if service water runs low.
The ingress of service water into the drinking water network must be prevented when switching over to drinking water supply.
The pump must be disabled if the service water reservoir runs low of water (dry-run protection).