Grundfos LC 221 Series, Installation And Operating Instructions Manual

Page: 12 / 832

English (GB)
12
3.1 Applications
Grundfos Multilift MOG and MDG lifting stations are designed for
the collection and pumping of domestic wastewater with no free
flow to sewer level. The grinder systems allows the use of small
1 1/4" or 1 1/2" discharge pipes which are ideal for long distances
and high-head applications. The Grundfos Multilift MOG and
MDG 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).
The lifting stations are capable of pumping liquids containing
fibres, textiles, faeces, etc., below sewer level from single-family
houses (MOG) or multi-family houses, offices, schools, hotels,
restaurants, public areas and other commercial buildings (MDG).
Do not pump rainwater with the Multilift MOG and MDG 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 MDG.
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 MOG and MDG Multilift lifting stations are described in the
following sections:
• section
5.1 Lifting station describing the lifting station with
collecting tank, pump and level sensor
• section 5.2 LC 221 controller describing the controller as well
as the function 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 MOG and MDG lifting stations are supplied
complete with one or two single- or three-phase submersible
grinder pumps connected to the LC 221 controller incorporating a
level sensor.
Type key, lifting station
Caution
Abrasive particles (e.g. high content of sand) in
the pumped liquid will reduce the life of the pump
and especially the grinder system.
Warning
The motor lifting bracket is only intended for
lifting the pump. Never lift or lower the lifting
station by means of the lifting bracket.
Note Lift the lifting station by the collecting tank.
Example M OG .22 .3 .4
Multilift lifting station
OG = one grinder pump
DG = two grinder pumps
Output power, P
2
/ 100 (W)
1 = single-phase motor
3 = three-phase motor
2 = 2-pole motor
4 = 4-pole motor