Grundfos Multifit MD Series User manual

Multilift MD, MLD
Installation and operating instructions
GRUNDFOS INSTRUCTIONS
Other languages
http://net.grundfos.com/qr/i/98127059

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
TABLE OF CONTENTS
Page
1. Symbols used in this document
2. Scope of delivery
2.1 MD
Grundfos Multilift MD lifting stations are supplied complete with
collecting tank, butterfly-non-return valves, a sensor unit with
cable and two pumps with cable, both connected to the LC 221
controller. The controller includes a power supply cable with plug.
An accessories bag containing the following items is also
included:
• 1 x installation and operating instructions
• 1 x Quick guide for controller menu
• 1 x discharge adapter flange, DN 80, with connection piece,
DN 100 (outer diameter, 110 mm)
• 1 x flexible hose, DN 100, and two clamps to connect the
discharge pipe
• 1 x flexible hose, DN 70, and two clamps to connect the
venting pipe
• 2 x screw and expansion anchor for tank fixation
• 3 x screw and washer for fastening a pipe plug in the inlet disk,
if required
• 1 x socket seal, DN 100
• 1 x socket seal, DN 50, for diaphragm pump connection or
inlet, DN 50
• 1 x gasket kit, DN 80, 4 bolts M16, nuts and washers
(galvanised).
2.2 MLD
Grundfos Multilift MLD lifting stations are supplied complete with
collecting tank, butterfly-non-return valves, a sensor unit with
cable and two pumps with cable, both connected to the LC 221
controller. The controller includes a power supply cable with plug.
An accessories bag containing the following items is also
included:
• 1 x installation and operating instructions
• 1 x Quick guide for controller menu
• 1 x discharge adapter flange, DN 80, with connection piece,
DN 100 (outer diameter, 110 mm)
• 1 x flexible hose, DN 100, and two clamps to connect
discharge pipe
• 1 x flexible hose, DN 70, and two clamps to connect venting
pipe
• 4 x screw and expansion anchor for tank fixation
• 1 x socket seal, DN 150
• 1 x flexible hose connection with two clamps, DN 50, for
diaphragm pump connection or inlet, DN 50
• 1 x gasket kit, DN 80, 4 bolts M16, nuts and washers
(galvanized).
1. Symbols used in this document 2
2. Scope of delivery 2
2.1 MD 2
2.2 MLD 2
3. General description 3
3.1 Applications 4
4. Transportation and storage 4
5. Product description 4
5.1 Lifting station 4
5.2 LC 221 controller 6
6. Operating LC 221 controller 10
6.1 Description of display 10
6.2 Setup menu 12
6.3 Information menu 13
6.4 Description of fault indications 14
7. Installation of lifting station 16
7.1 General description 16
7.2 Guidelines for installation of lifting station 17
7.3 Procedure for installation of lifting station 17
8. Installation of LC 221 controller 19
8.1 Location 19
8.2 Mechanical installation 19
8.3 Electrical connection 20
8.4 Setting of LC 221 20
8.5 Wiring diagrams 21
9. Startup 22
10. Maintenance and service 22
10.1 Mechanical maintenance 23
10.2 Motor 23
10.3 Electrical maintenance 23
10.4 Cleaning the level sensor 24
10.5 Contaminated lifting station or components 24
11. Fault finding 25
12. Technical data 26
12.1 Lifting station 26
12.2 Collecting tank 26
12.3 Pump 26
12.4 LC 221 controller 26
13. Disposal 26
Warning
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
Warning
The use of this product requires experience with and
knowledge of the product.
Persons with reduced physical, sensory or mental
capabilities must not use this product, unless they
are under supervision or have been instructed in the
use of the product by a person responsible for their
safety.
Children must not use or play with this product.
Warning
If these safety instructions are not observed, it may
result in personal injury.
Warning
These instructions must be observed for
explosion-proof pumps.
Caution
If these safety instructions are not observed, it may
result in malfunction or damage to the equipment.
Note
Notes or instructions that make the job easier and
ensure safe operation.

English (GB)
3
3. General description
Grundfos Multilift MD and MLD lifting stations are supplied
complete with collecting tank, pumps, level sensor, LC 221
controller and connection accessories.
The following gives a description of the components.
Fig. 1 Multilift MD front and rear view Fig. 2 Multilift MLD front and rear view
TM05 1521 2911
Pos. Description
1Pump
2 Lifting eye for pumps
3Nameplate
4 Venting port, DN 70 (outer diameter, 75 mm), open
5 Screw cap for pressure tube and tank inspection opening
6 Vertical inlet, DN 150 (seal is accessory)
7 Fixing point
8Non-return butterfly valve, DN 80, with inspection cover
and drain screw to lift up the valve flap
9Discharge adapter flange, DN 80, to pipe ∅110 with
flexible connection piece and 2 clamps
10 Side or top inlet, DN 50 (seals are accessory).
Socket for MD; connecting piece for MLD
11 Collecting tank with carrying handle moulded into tank
body
12
Port for manually operated diaphragm pump, 1 1/2".
Socket with seal for MD; connecting piece with flexible
connection hose and clamps for MLD
13 Horizontal inlet, DN 100 (seal is accessory)
14 Adjustable inlet disk, DN 100
(DN 150 optional as accessory)
15 Separate inspection cover
TM05 1522 2911

English (GB)
4
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 must 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 must 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, P2 / 100 (W)
1 = single-phase motor
3 = three-phase motor
2 = 2-pole motor
4 = 4-pole motor
TM04 7639 2210
Pos. Description
1 Type designation
2 Product number
3 Production code (year/week)
4 Frequency [Hz]
5 Number of phases + voltage [V]
6 Voltage [V]
7 Full-load current [A]
8 Motor input power P1[kW]
9 EAC and CE mark
10 Duty type
11 Serial number
12 Maximum flow rate [m3/h]
13 Minimum head [m]
14 Maximum head [m]
15 Maximum liquid temperature [°C]
16 Maximum ambient temperature [°C]
17 Weight [kg]
18 European norm identification code
19 Notified Body
20 Reference number for the Declaration of Performance
Typ
Prod.-Nr.
P. c.
fHz
Serial no.
Phases
UV
A
kW
Gkg
m
m
98127055
0197
I1/1
P1
Qmax
Hmin
Hmax
TMed
max
TAmb
max
m /h
3
C
C
Made in Germany
96075419
DK - 8850 Bjerringbro, Denmark
1
2
3
4
5
6
10
11
12
13
14
15
16
17
18
20
19
7
8
9

English (GB)
5
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 MD 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 MD collecting tank offers four horizontal inlets in
the sides (2 x DN 100 and 2 x DN 50) and three vertical inlets at
the top of the tank (2 x DN 150 and 1 x DN 50). The centres of the
horizontal inlets are 120 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 MLD collecting tank offers one vertical inlet, DN 50, at the
top of the tank and one vertical inlet, DN 150, in the stepped part
of the tank.
The tank volume and effective volume (volume between start and
stop) for Multilift MD and MLD lifting stations appear from the
following table:
Setting to the relevant start inlet level must be made during the
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 Pumps
The pump impellers are designed as free-flow vortex impellers,
ensuring almost unchanged performance throughout the entire
life of the pump. The stator housing of the motor is made of cast
iron. 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 a capacitor 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
of Multilift MD/MLD22, 24, 32 and 38 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. 14. For direction of
rotation, see section 10.2 Motor.
Performance curves are available in the databooklet, which you
can download via the QR code or link below:
5.1.3 Shaft seal
The pumps have three shaft seals, the oil chambers in between are
filled for life and therefore require no maintenance.
For replacement in case of service, please see service
instructions.
5.1.4 Motor cable
The motor cable is fitted to the motor via a cable entry.
The enclosure class is IP68. The length of the cable is either 4 m
or 10 m.
Nameplate, motor
Fig. 4 Nameplate, motor
MD
Inlet level [mm] 180 250 315
Total tank volume [l] 130
Effective tank volume [l] 49 69 86
MLD
Inlet level [mm] 560
Total tank volume [l] 270
Effective tank volume [l] 190
Note
If the motor is overloaded, it will stop automatically.
When it has cooled to normal temperature, it will
restart automatically.
http://net.grundfos.com/qr/i/98288126
TM03 3618 0506
Pos. Description
1 Product number and model
2 Production code (year/week)
3 Frequency
4 Number of phases
5 Rated voltage
6 Rated current
7 Input power
8 Shaft power
9 Serial number
10 Operating mode
11 Power factor
12 Rated speed
13 Insulation class
14 Weight
15 Production country
DK - 8850 Bjerringbro, Denmark
1217 001
98189706 - A
0.77
S3-40%-1min
1405
F
24
50
3
400
5.3
2.8
2.2
Phases
f
U
P. c .
Prod.-Nr.
I1/1
P1
P2
kg
IP68
98189706 Made in Germany
kW
A
V
Hz
n
G
Serial no.
min
-1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

English (GB)
6
5.1.5 Non-return valve
The DN 80 non-return valve includes a drain screw to lift up the
internal flap in order to drain the discharge pipe in case of
maintenance or service. The valve is designed and tested
according to EN12050-4. See fig. 5.
Fig. 5 Butterfly (double) non-return valve, DN 80
5.1.6 Level sensor
The piezoresistive pressure sensor placed in the controller is
connected via a hose to a pressure tube in the tank. The screw
cap where the hose is connected includes a connection for a DN
100 tube. This tube, the pressure tube, extends down into the
tank. The rising liquid level compresses the air inside the
pressure tube and hose, and the piezoresistive sensor transforms
the changing pressure into an analogue signal. The control box
uses the analogue signal to start and stop the pump and to
indicate high water-level alarm. The pressure tube is fixed
underneath the screw cap and can be taken out for maintenance,
service and for cleaning the inside of the tube. An O-ring ensures
tightness.
The hose is supplied in lengths of 4 or 10 m. The hose must be
connected to the controller.
Fig. 6 Screw cap with hose, DN 100 tube
5.2 LC 221 controller
The LC 221 is a level controller specially designed for controlling
and monitoring the Grundfos lifting stations, Multilift MD and
MLD. The basis for the control is the signal received continuously
from the piezoresistive, analogue level sensor.
The level controller switches the MD and MLD Multilift pumps on
and off according to the liquid level measured by the level sensor.
When the first start level is reached, the first pump will start, and
when the liquid level has been lowered to the stop level, the pump
will be stopped by the controller. If the liquid level rises up to the
second start level, the second pump will also start, and when the
liquid level has been lowered to the stop level, the pumps will be
stopped by the controller.
Starts alternate between the two pumps.
In case of pump failure in one pump, the other pump will take
over (automatic pump changeover).
An alarm will be indicated in case of high water-level in the tank,
pump failure, etc.
Furthermore, the level controller has many more functions as
described below.
Fig. 7 LC 221 level controller for Multilift MD and MLD
The LC 221 controller has the following functions:
• on/off control of two wastewater pumps based on a continuous
signal from a piezoresistive level sensor with alternating
operation and automatic changeover in case of pump failure
• motor protection with motor-protective circuit breaker and/or
current measurement as well as connection of thermal
switches
• motor protection via operating-time limitation with subsequent
emergency operation. Normal operating times are max.
25 seconds (MD) and 55 seconds (MLD), and the operating
time is limited to three minutes (see section 6.4 Description of
fault indications, fault code F011).
• automatic test runs (2 seconds) during long periods of
inactivity (24 hours after last operation)
• re-starting delay up to 45 seconds after returning from power
cut-off to mains operation (in order to even out the mains load
when several appliances are started up at the same time)
Note
Loosen the lock nut a little before turning the drain
screw.
TM051530 2911
TM05 0332 1011
TM05 1859 3811

English (GB)
7
• setting of delay times:
– stopping delay (time from the stop level is reached till the
pump is stopped) - reduces water hammer if pipes are long
– starting delay (time from the start level is reached till the
pump is started)
– alarm delay (time from a fault appears till an alarm is
indicated). This prevents short-time high-level alarm in case
of temporary high inflow to the tank.
• automatic current measurement for alarm indications
• setting of current values:
– overcurrent (preset)
– rated current (preset)
– dry running current (preset).
• operating indication of:
– operating mode (auto, manual)
– operating hours
– impulses (number of starts)
– highest measured motor current.
• alarm indication of:
– pump status (running, fault)
– phase sequence failure and missing phase
– thermal-switch failure
– high-water alarm (5 seconds delay)
– time for service/maintenance (selectable).
• selection of automatic alarm resetting
• fault log of up to 20 alarms
• selection between different start levels
• selection of maintenance interval (0, 3, 6 or 12 months).
As standard, the LC 221 has four potential-free outputs for:
– pump running
– pump failure
– high water-level alarm
– common fault.
Furthermore, LC 221 has six digital inputs for the following
functions:
– connecting an analogue sensor (4-20 mA or 0-5 V)
– connecting up to four level switches and pressure sensors
instead of analogue sensor. An additional float switch can
be connected to the alarm input as backup for the analogue
sensor.
– connecting a separate level switch to be used for flood
detection outside Multilift MD or MLD. Lifting stations are
often installed in a sump inside the basement - the lowest
point in the building. In case of e.g. groundwater inflow or
water pipe burst, an alarm will be indicated by the controller.
– connecting a piezoresistive pressure sensor PCB
(pre-assembled)
– connecting an external alarm reset
– connecting the thermal switch of the motor.
For updates and further adjustments, a PC Tool can be
connected. See service instructions.
To allow for the situation that the normal power supply should fail,
a battery (accessory) can be installed which activates an acoustic
alarm (buzzer). The buzzer is activated as long as the fault exists.
It cannot be reset.
In case of sectional power failure, the common alarm output
which is a potential-free changeover contact can be used to
forward the alarm signal to a control room by means of an
external power source.
Type key, LC 221 controller
Nameplate, LC 221 controller
The controller type, voltage variant, etc. are stated in the type
designation on the nameplate situated on the side of the
controller cabinet.
Fig. 8 Example of an LC 221 nameplate
Example LC 221 .2 .230 .1 .10 .30
LC 221 = controller type
1 = one-pump controller
2 = two-pump controller
Voltage [V]
1 = single-phase
3 = three-phase
Max. operating current [A]
Capacitors [μF]
Starting method:
[ ] = DOL
SD = Star-delta
TM054782 3311
Pos. Description
1 Type designation
2 Product number
3 Production code (year, week)
4 Number of phases
5 Maximum pump input current
6 Maximum voltage at potential-free contact
7 Maximum backup fuse
8 Minimum ambient temperature
9Version
10 Serial number
11 Rated voltage
12 Power consumption
13 Maximum current at potential-free contact
14 Weight
15 Maximum ambient temperature
16 Frequency
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Type
Prod.-No.
P.c.
f
Phases U
G
Serial no.
Pmax
TAmb max
IPump max
V
A
Hz
C
O
kg
98189707
LC 221.1.230.1.10.30/150 MPU
98189707
1221
1
10
250
16
0
V01
0012
220-240
3
2
5.2
40
50
Ucontact max
IFuse max
TAmb min
A
C
O
Icontact max
V
W
A
Ic < 10 kA
IP55
Made in Germany

English (GB)
8
5.2.1 Design
The LC 221 level controller incorporates the necessary
components to control and protect the pumps, such as relays and
capacitors for single-phase motors, contactors for three-phase
motors and additional motor-protective circuit breaker
(> Multilift MD22 or MLD22).
The control panel offers a user interface with operating buttons
and a display for indication of operating conditions and fault
indications.
Furthermore, it has an integrated piezoresistive pressure sensor
which is activated by compressed air directly via the pressure
tube inside the collecting tank. Finally, it has terminals for power
supply, connection to the pump and the inputs and outputs
mentioned in section 5.2 LC 221 controller.
The front cover is closed by four bayonet fastenings with quarter
turn locks. On the left side, the locks are extended and connected
to the cabinet bottom with hinge strings. The cabinet offers the
possibility of being mounted on a wall without opening it first.
A drilling template and six screws with rubber guides are
enclosed.
5.2.2 Control panel
Fig. 9 Control panel
Display (pos. 1)
The display shows all relevant operating data and fault indications.
The operation and fault indications are described in section
6.1 Description of display.
Operating buttons (pos. 2)
The level controller is operated by the operating buttons placed
under the display. The functions of the operating buttons are
described in the table below:
Status LEDs (pos. 3)
The upper LED (green) is on when the power supply is on.
The lower LED flashes (red) in case of fault to make the fault
visible from a long distance and is thus an addition to the display
symbols and fault codes.
Selector switch (pos. 4)
TM05 1860 3811
Pos. Description
1 Display
2 Operating buttons
3StatusLEDs
4 ON-OFF-AUTO selector switch
1
2
34
Operating
button Description
• go left in the main menu.
• go up in the submenus.
• decrease values in the submenus.
• confirm a selection.
• activate the submenus.
• reset the buzzer.
• go right in the main menu.
• go down in the submenus.
• increase values in the submenus.
Switch Description of function
The operating mode is selected by the
ON-OFF-AUTO selector switch which has three
different positions:
POS I:
Starts the pump manually. The operating time
protection is active and indicates alarm after three
minutes. Normal operating times are up to max.
25 seconds (MD) and 55 seconds (MLD).
POS O:
• Stops the pump when running and cuts off the
power supply to the pump. The three symbols
"Settings locked", "Information" and "Setup" will
be visible.
• Resets fault indications.
POS AUTO:
Automatic operation. The pump will start and stop
according to the signal from the level sensor.

English (GB)
9
5.2.3 Internal layout of LC 221
Figure 10 shows the internal layout of LC 221.
Fig. 10 Internal layout LC 221 (three-phase PCB as example)
TM05 3597 1612 - TM05 3719 1712
Note: Cable connections for pos. 8-15:
Use a cable tie if leads protrude more than
20 mm from the cable sheath.
20 7
7
>20
X5
Pos. Description Comments Terminal designation
1 Terminals for power supply PE, N, L3, L2, L1
2 Terminals for connecting pump 1 PE, N, W1, V1, U1
3 Terminals for connecting pump 2 PE, N, W2, V2, U2
4 Terminals for thermal switch, pump 1 T1, T2
5 Terminals for thermal switch, pump 2 T1, T2
6 Terminals for external reset 230 V 11, 12
7 Terminals for external alarm (outside the tank) 230 V 13, 14
8 Terminals for common fault
Potential-free changeover NO/NC
contacts with max. 250 V / 2 A.
Attention: Connect these terminals
to supply network potential or low
voltage but do not mix the two.
X11
9 Terminals for high water-level alarm X10
10 Terminals for failure, pump 2 X9
11 Terminals for failure, pump 1 X8
12 Terminals for operation, pump 2 X7
13 Terminals for operation, pump 1 X6
14
Terminals for level switches Digital 81-88
Terminals for additional high water-level alarm
(inside the tank) Digital 81, 82
15 Terminals for analogue sensor 0-5 V or 4-20 mA 91 (GND), 92 (Signal), 93 (12 V)
16 Service connector to PC Tool -
17 Connector for GENIbus interface module Not in use for this application -
18 Control circuit fuse Fine-wire fuse:
100 mAT / 20 mm x ∅5-
19 Piezoresistive pressure sensor module 0-5 V -
20 DIP switches Not in use for this application -
21 Connector for battery, 9 V
Non-rechargeable batteries only.
The controller is not equipped with a
charging device.
-

English (GB)
10
6. Operating LC 221 controller
6.1 Description of display
The display of the LC 221 level controller is shown in fig. 11.
Fig. 11 LC 221 display
The table below describes the symbols shown in the display as well as the corresponding functions and indications.
TM05 1861 3811
Symbol Function Description
Settings locked The symbol is visible when the setup menu is locked. This prevents unauthorised persons from
making changes to the settings. To unlock the buttons, enter the code 1234.
Automatic operating
mode
The symbol is visible when the level controller is in automatic mode, i.e. when the selector switch
is in position AUTO.
Information
The symbol is visible when there is information about faults, operating hours, number of starts,
max. current of pump. The symbol will be visible if the level controller detects a fault and the fault
will be written into the fault log. After you have entered the fault log, the symbol will switch off.
See section 6.3 Information menu.
Setup
The setup menu holds information about setup for start level, rated current, the stop-, start- and alarm
delay, selection of maintenance interval, reset (automatic or manual) and reset back to factory
settings. For the procedure and a description of the settings, see section 6.2 Setup menu.
Alarm The symbol is visible if an alarm situation occurs. The type of alarm will appear from the
information menu. The symbol disappears when the fault has disappeared.
Impulse counter The symbol is visible when the number of starts in the information menu is shown in the display.
Settable times and fault
indication
The symbol is visible when the operating hours in the information menu and the delays set in the
setup menu are shown in the display. The symbol flashes when max. operating time has been
exceeded.