Grundfos LC 221 Series, Installation And Operating Instructions Manual

Page: 13 / 832

English (GB)
13
Nameplate, lifting station
Fig. 3 Nameplate, lifting station
5.1.1 Collecting tank
The gas-, odour- and pressure-tight collecting tank is made of
wastewater resistant polyethylene (PE) and has all necessary
ports for the connection of inlet pipes, discharge pipe, venting
pipe and a manually operated diaphragm pump, which is
available as an accessory.
The collecting tank has a turnable, eccentric disk in the back
allowing adjustment of the inlet to any height between 180 and
315 mm above the floor. The most common heights are marked
beside the inlet. See section
7.3 Procedure for installation of
lifting station .
Furthermore, the collecting tank offers four horizontal inlets in the
sides (2 x DN 100 and 2 x DN 50) and two vertical inlets at the top
of the tank (1 x DN 150 and 1 x DN 50). The centres of the
horizontal inlets are 115 mm (DN 50) and 250 mm (DN 150)
above the floor.
The side and back inlets 180 and 250 mm above the floor are for
direct connection to wall-hung or floor-standing toilet according to
EN 33 and EN 37. Further sanitary appliances can be connected
to the other ports.
The tank volume and effective volume (volume between start and
stop) for Multilift MOG and MDG lifting stations appear from the
following table:
Setting to the relevant start inlet level must be made during
start-up phase via the setup menu. See section
6.2 Setup menu .
The first step after power supply connection is a start-up phase
with level setting.
To minimise sedimentation, the tank bottom is chamfered to lead
the wastewater to the pump.
5.1.2 Pump
The pump impellers are designed as free-flow vortex impellers
ensuring almost unchanged performance throughout the entire
life of the pump. See the pump curves in section
12.5 Performance curves .
The stator housing of the motor is made of cast iron with a
150 µm epoxy coating. The pump has a mechanical shaft seal.
See more technical data in section
12. Technical data .
Single-phase motors are protected by a thermal switch in the
windings and run via starting and operation capacitors inside the
controller cabinet.
Three-phase motors are protected by a thermal switch in the
windings and an additional thermal circuit breaker in the cabinet
to cut out the motor in case of overload.
If the phase sequence for three-phase pumps is wrong, the
controller will indicate fault and prevent the pump(s) from starting.
For correction of phase sequence, see fig. 17.
5.1.3 Shaft seal
The grinder pump incorporates two shaft seal variants which are
both of the cartridge seal type.
Pumps up to and including 1.5 kW have a silicon carbide/silicon
carbide (SiC/SiC) mechanical shaft seal as primary seal and a lip
seal as secondary seal. In connection with service, the lip seal
and mechanical shaft seal are supplied as one replaceable unit
ready for fitting. The components can be replaced individually.
See service instructions.
Pumps as from 2.6 kW have a double seal consisting of a SiC/SiC
mechanical seal as primary seal and a carbon/aluminium oxide
mechanical shaft seal as secondary seal. The components can
be replaced individually. See service instructions.
TM
04
76
39
22
10
Pos. Description
1 Type designation
2 Product number
3 Production code (year/week)
4 Frequency [Hz]
5 Number of voltage [V]
6 Voltage [V]
7 Full-load current [A]
8 Motor input power P
1
[kW]
9 CE mark
10 Duty type
11 Serial number
12 Maximum flow rate [m
3
/h]
13 Minimum head [m]
14 Maximum head [m]
15 Maximum liquid temperature [°C]
16 Maximum ambient temperature [°C]
17 Weight [kg]
18 Blank
Inlet level [mm] 180 250 315
Tank volume [l] 93 93 93
Effective volume [l] 23 37 50
Note
Multilift MDG lifting stations have two pumps,
thus providing a standby pump in case of pump
failure or additional pump performance if the inlet
exceeds the performance of one pump.
Always install Multilift MDG lifting stations if the
wastewater flow must not be interrupted.
For grinder system, see section 5.1.5 Grinder
system.