Description And Function; Description Of The Unit - Wilo -DrainLift M1/8 Einbau- Und Betriebsanleitung

English
Fig. 1: Description of the unit
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• Inlet seal for additional inlet, DNb100 (one is already included in the scope of delivery)
• Connection set for inlet, DNb150 (curve cutter, inlet seal)
• Gate valve (DNb80) for discharge pipe
• Gate valve (DNb100, DNb150) for inlet pipe
• Diaphragm hand pump (R 1½) (without hose)
• 3-way cock for switching over to the manual suctioning from the pump sump/tank
• Alarm switchgear
• Rechargeable battery (NiMH) 9 V/200 mAh
• Horn 230 V/50 Hz
• Flashing light 230 V/50 Hz
• Signal lamp 230 V/50 Hz

6 Description and function

6.1 Description of the unit

The DrainLift M1/8 sewage lifting unit (Fig. 1) is a ready-to-connect, fully submersible
sewage lifting unit (overflow level: 2bmWS, overflow time: 7bdays) 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 integrated centrifugal pump with a clog-free vortex impeller is equipped with a single-
phase or three-phase AC motor. For automatic operation, with switchgear with shock-
proof or CEE plug, 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. The pump mounted to the tank is switched on via the switchgear and the collected
sewage is automatically pumped into the connected external sewage line.
The pump is 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 respective
in-house pressure pipeline. For example, by setting the run-on time up to the slurping
operation, knocking of the non-return valve can be prevented.
A non-return valve (necessary accessory), which is to be installed directly after the unit in
accordance with EN 12056, prevents the fluid from flowing back into the unit after the
pump is switched off.
1 Pump
2 Connection for the non-return valve (accessory)
3 Low inlet, DNb50
4 Buoyancy safeguard
5 Combination inlet/venting connection,
DNb50/DNb70
6 Freely selectable inlet surfaces for main inlet,
DNb100/DNb150
7 Inspection opening + Level switching with rod
float switch
WILO SE 02/2011