The hydro-mechanical controls combine the “traditional” controls by means of automatic switches with the use of mechanical flow effects. This achieves a great deal of functional safety. The Optima system from WISY basically works with two pressure pumps.
The loading pump of Optima is fitted in the storage tank as a submersible pump and fitted with a fine floating suction filter and a float switch. The loading pump brings the rainwater to the normal suction rotary pump in the Optima. The admission pressure has the effect that this only has to pump and that the inlet pipe from the potable water feed is closed.
Normal rainwater units with only one suction pump, long suction paths and large differences in height always lead to problems in operating safety. Not with Optima: if a user valve is opened, both pumps start through the automatic switch. The maximum flow volume of the Optima then lies at about 70 l/min.
Because of the two-pump system, the Optima can also be used in unfavourable conditions (e.g. long suction length or large difference in height between cistern floor and pump location in the rainwater unit). If required the Optima can be flexibly fitted with more powerful pumps and loading pumps.
Switching over to potable water feed is made automatically. If the cistern is empty, the float switch switches off the loading pump. As there is now no admission pressure, potable water is drawn out of the feed tank of the Optima. The lowering water level in the feed tank causes the floating valve at the outlet of the potable water pipe to open. The valve closes again when the feed tank is full. But manual switching to potable water feed is easily possible at any time through network discoupling of the loading pump. The feed tank is fitted with an extra emergency overflow. The potable water feed is fitted as an open outlet according to DIN 1988/4. A continuous exchange of water in the feed tank follows automatically.
The Optima is fitted with a level indicator for the storage tank or cistern. The measuring appliance works on the basis of a pneumatic measuring process. Each pipework pressure that the rainwater unit works with is displayed by a manometer.
Sizes b x h x d (mm): 465 x 500 x 310 |