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Fig. 1: Description of the unit
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6 Description and function
6.1 Description of the unit
The Liftson M-2V-208 sewage lifting unit (Fig. 1) is a ready-to-connect, fully submersible
sewage lifting unit (overflow level: 2 mWS, overflow time: 7 days) with a collection tank
that is impermeable to gas and water and that is equipped with a buoyancy safeguard. Due
to the special tank geometry, settling sediments are also fed to the pump so that deposits
in the tank are prevented.
The built-in centrifugal pumps with clog-free vortex impellers are equipped with single-
phase or three-phase AC motors. For automatic operation, with switchgear with main
switch, potential-free contact, integrated alarm; independent of the mains via built-in
rechargeable battery (accessory).
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6.2 Function
The introduced sewage is collected in the collection tank of the lifting unit. This is done via
sewage inlet pipes, which can be connected to the marked tank areas as desired.
If the water level rises to the switch-on level, a contact is closed in the integrated rod float
switch. One of the pumps mounted to the tank is switched on via the switchgear and the
collected sewage is automatically pumped into the connected external sewage line. If the
water level continues to rise, the second pump is activated. A pump alteration occurs after
every pump operation. If one of the pumps should fail, the other pump takes over all the
pumping work.
The pump(s) is/are switched off via a time relay in the switchgear. By setting the pump run
time on this relay, the operating mode of the unit can be optimised according to the res-
pective in-house pressure pipeline. For example, by setting the run-on time up to the slur-
ping operation, knocking of the non-return valve can be prevented.
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.
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Pump
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Non-return valve
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Low inlet, DN 50
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Buoyancy safeguard
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Level switching with rod float switch
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Combination inlet/venting connection, DN 50/
DN 70
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Freely selectable inlet surfaces for main inlet,
DN 100/DN 150
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Inspection opening
Salmson 04/2011
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