7
2. General
2.3 Functional description:
The pump unit comprises a multi-stage regenerative rotary
pump and the automatic pressure switch. The maintenance-
free automatic pressure switch has an automatic switch
on/off function geared towards demand which absorbs any
pressure blows, integrated dry-run protection and a back-
water flap. The pump unit is located behind the installation
door and is mounted on vibration dampers to guarantee mi-
nimum operating noise.
Rainwater mode:
If there is a drop in pressure in the service water network cau-
sed by a consumer being switched on, the rotary pump is
switched on by the automatic pressure switch. Rainwater is
suctioned out of the cistern and fed into the service water net-
work through the pressure pipe connection of the automatic
pressure switch. If the consumer is turned off, the automatic
pressure switch switches the pump off after a brief run-on
time. This flow-dependent switch-off guarantees constant
pressure.
Mains refill mode with drinking water:
Two different switch units are available for controlling the fully
automatic drinking water feeding.
The
KESSEL-Switch unit
Aqatronic
®
S
controls the
drinking water feeding through a floating switch installed in
the cistern.
With the
KESSEL-Schaltgerät
Aqatronic
®
K
switch unit
Aqatronic
®
K the water level in the cistern is determined by
an ultrasonic sensor and indicated on a digital display on the
switch unit. An optical and acoustic warning is given in the
event of backwater from the sewer (when an alarm point is
set). The system switches automatically to drinking water
mode. Further switching points can be programmed as re-
quired.
Drinking water feeding can also be activated manually with
both switch units.
If the water level in the cistern drops to below a defined mi-
nimum level, the switch unit opens a 3-way switch-over valve
if required. Drinking water is suctioned directly from the drin-
king water feeding tank and pumped into the service water
network. Thanks to the floating switch in the drinking water
feeding tank, only the amount of drinking water required is
fed automatically. As soon as rainwater enters the cistern
again, the
Aqatronic
®
-switch unit switches back to rainwa-
ter mode.
Flow route
feeding mode
Flow route
rain water mode
Rainwater drainage
Rainwater filter
Rainwater feeding with fixtures
drinking water feeding
Pump with automated pressure switch
Emergency overflow with odour trap
Switch unit
Aqatronic S
Water tap (non drinking)
