Grundfos LC 221, Installation And Operating Instructions Manual

Page: 7 / 796

English (GB)
7
3.1 Applications
Grundfos Multilift MD and MLD lifting stations are designed for
the collection and pumping of domestic wastewater with no free
flow to sewer level. Grundfos Multilift MD and MLD lifting stations
are designed for the collection and pumping of the following
liquids:
• domestic wastewater, including grey wastewater without
faeces, black wastewater with faeces (discharge from water
closets)
• sludge-containing water.
The lifting stations are capable of pumping liquids containing
fibres, textiles, faeces, etc., below sewer level from multi-family
houses, offices, schools, hotels, restaurants, public areas and
other commercial buildings and similar industrial applications.
Do not pump rainwater with the Multilift MD and MLD lifting
stations for these two reasons:
• The motors of the lifting stations are not designed for
continuous operation which may be necessary in case of
heavy rainfall.
• Rainwater must not be discharged into a lifting station inside a
building according to EN 12056-4.
If in doubt, please contact Grundfos for advice.
Do not discharge the following substances/types of wastewater
via a lifting station:
• solid matter, tar, high content of sand, cement, ash, cardboard,
debris, garbage etc.
• wastewater from sanitary installations situated above the flood
level (this should be drained away via a free-flow drainage
system according to EN 12056-1).
• wastewater containing hazardous substances such as greasy
wastewater from large-scale catering establishments.
For drainage of greasy wastewater, use a grease separator
according to EN 1825-2 between a canteen or commercial
kitchen and the Multilift MD or MLD.
4. Transportation and storage
For long periods of storage, the LC 221 controller must be
protected against moisture and heat.
After a long period of storage, the pumps should be inspected
before they are started up again. Make sure that the impellers
can rotate freely.
5. Product description
The MD and MLD Multilift lifting stations are described in the
following sections:
• section
5.1 Lifting station describing the lifting station with
collecting tank, pumps, non-return valve and level sensor
• section 5.2 LC 221 controller describing the controller as well
as the functions and operation of the controller.
In section 7. Installation of lifting station and the following
sections, the above components are described as one unit.
5.1 Lifting station
The Grundfos Multilift MD and MLD lifting stations are supplied
complete with two single- or three-phase submersible pumps
connected to the LC 221 controller incorporating a level sensor.
Type key, lifting station
Nameplate, lifting station
Fig. 3 Nameplate, lifting station
Warning
The motor lifting eye is only intended for lifting
the pump. Never lift or lower the lifting station by
means of the lifting eye.
Note
Lift the lifting station by the collecting tank.
Example M L D .22 .3 .4
Multilift lifting station
L = large tank
D = 2 pumps
Output power, P
2
/ 100 (W)
1 = single-phase motor
3 = three-phase motor
2 = 2-pole motor
4 = 4-pole motor
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 P1 [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