Description And Function; Description Of The Unit - Wilo -DrainLift XL Einbau- Und Betriebsanleitung

English
Fig. 1: Description of the unit
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6 Description and function

6.1 Description of the unit

The DrainLift XL sewage lifting unit (Fig. 1) is a connection-ready, fully submersible sewage
lifting unit (flooding height: 2 mwc, flooding time: 7 days) with a gas and watertight col-
lection tank and buoyancy safeguards.
The integrated centrifugal pumps are equipped with clogging-free vortex impellers. The
level sensor (Fig. 1, no. 5) registers the level in the tank and sends this value to the switch-
gear, which switches the pumps on or off automatically. Refer to the operating instructions
of the switchgear for a detailed description of the functions.
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6.2 Function
The discharged sewage is collected in the collection tank of the lifting unit. The inlet is
from a sewage inlet pipe which can be connected as required to the horizontal surface
(rear of the tank).
The DrainLift XL sewage lifting unit is delivered with switchgear and pre-installed CEE plug
with phase inverter, breakdown barrier and level sensor supplied in the same package. The
water level in the tank is registered by means of the integrated level sensor. If the water
level rises as far as the set activation point then one of the pumps mounted on the tank is
switched on and the collected sewage is automatically pumped into the connected exter-
nal sewage line. If the water level continues to rise, the second pump is activated. When
the high water level is reached, an optical and audible signal is issued, the alarm signal con-
tact is actuated and there is additionally a forced switch-on of the pump(s). In order for
both pumps to be loaded evenly, pump cycling occurs after each pump cycle. If one of the
pumps fails, the other pump takes over the entire pumping work.
The pump(s) are deactivated once the deactivation level is reached. To avoid sudden valve
closures, a follow-up time can be set in the switchgear in order for the base-load pump to
be operated up to slurping operation. The follow-up time is understood to be the time that
elapses after the level drops below the deactivation point until the base-load pump
switches off.
A dual non-return valve is built into the unit so that a non-return valve required in acc. with
EN 12056 no longer has to be installed in the pressure pipeline. The pressure channels of
both pumps are joined in the non-return valve. A venting mechanism allows the pressure
pipe to be drained into the tank, if necessary.
1 Pump
2 Non-return valve
3 Inlet DN 150
4 Buoyancy safeguards
5 Level sensor
6 Ventilation connection piece DN 70
7 Maintenance aperture
WILO SE 03/2011