DAB AQUATWIN TOP 132 Instruction For Installation And Maintenance page 36

4. GENERAL DESCRIPTION OF THE SYSTEM
The AQUATWIN TOP unit is used for the management and distribution of rain water. The unit detects the
lack of water in both rain water and mains collection system and corrects it to guarantee that the system
operates correctly (or rather, it never lets the identified users run out of water). Notify in the event of faults
and indicate the type of problem incurred.
The system is generally used for supplying utilities with non-drinking water such as washing machines, toilet
discharge and floor-washing or irrigation systems.
The main aim of the AQUATWIN TOP system is to give priority to the consumption of rain water rather than
mains water. When the rain water in the collection tank is insufficient (where a single tank is used), the
control unit passes to the mains water supply by means of the 150L storage tank, thus ensuring a flow of
water to the water drawing points (N.B: The water supplied by the system is not fit for drinking). The
connection between the rain water tank or tanks (the system may be connected to two independent rain
water tanks) and the mains water tank built into the system is selected by means of three-way valves
installed on the pump intake. If only one of the two rain water tanks does not have sufficient water available,
the system will work in hybrid mode with mains water and rain water.
The operation of the pumps is similar to a traditional pressure-boosting station with two pumps and "start-
stop" system by means of a pressure sensor and alternation of starts at each user request. When the
pressure drops by a predetermined value (set point) the pump starts; if it is not sufficient to bring the
pressure to the desired value the second pump starts. When the utilities are turned off and pressure is
restored the pumps are automatically deactivated. In the event of water lack the pumps stop and the fault is
indicated on the front of the control panel; the system is automatically reenabled when the water returns.
The water storage tank is provided with internal floats for automatically replenishing with mains water and for
indicating an overflow fault in the event of a malfunction of the solenoid valve. The fault is indicated locally by
a buzzer and it is possible to fit an alarm in a manned location.
The system is equipped with:
–
Air-gap system to avoid contamination between the mains water and the water present in the water
storage tank, which by stagnating could favour the proliferation of bacteria; for this purpose it is
recommended the MAN function on the panel to replace the water in the tank (the replacement is
bound to the request of water from the user).
–
Filter placed at the entry to the water storage tank to prevent the access of solid bodies or small
insects that could accelerate the proliferation of bacteria.
–
2" connections for eliminating excess water in the event of overflow, to be connected to a drain.
ENGLISH
34
Fig.2