Grundfos Unilift APG User manual

UNILIFT APG
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

UNILIFT APG
English (GB)
Installation and operating instructions ..................................5
Български (BG)
Упътване за монтаж и експлоатация.................................23
Čeština (CZ)
Montážní a provozní návod ........................................42
Deutsch (DE)
Montage- und Betriebsanleitung .....................................60
Dansk (DK)
Monterings- og driftsinstruktion ......................................78
Eesti (EE)
Paigaldus- ja kasutusjuhend........................................96
Español (ES)
Instrucciones de instalación y funcionamiento...........................114
Suomi (FI)
Asennus- ja käyttöohjeet .........................................133
Français (FR)
Notice d'installation et de fonctionnement..............................151
Ελληνικά (GR)
Οδηγίες εγκατάστασης και λειτουργίας................................170
Hrvatski (HR)
Montažne i pogonske upute .......................................189
Magyar (HU)
Telepítési és üzemeltetési utasítás ..................................207
Italiano (IT)
Istruzioni di installazione e funzionamento .............................225
Lietuviškai (LT)
Įrengimo ir naudojimo instrukcija ....................................244
Latviešu (LV)
Uzstādīšanas un ekspluatācijas instrukcija .............................262
Nederlands (NL)
Installatie- en bedieningsinstructies ..................................280
Polski (PL)
Instrukcja montażu i eksploatacji....................................298
3
Table of contents

Português (PT)
Instruções de instalação e funcionamento .............................316
Română (RO)
Instrucţiuni de instalare şi utilizare...................................334
Srpski (RS)
Uputstvo za instalaciju i rad .......................................352
Svenska (SE)
Monterings- och driftsinstruktion ....................................370
Slovensko (SI)
Navodila za montažo in obratovanje .................................388
Slovenčina (SK)
Návod na montáž a prevádzku .....................................405
Türkçe (TR)
Montaj ve kullanım kılavuzu .......................................423
Українська (UA)
Інструкції з монтажу та експлуатації ................................443
中文 (CN)
安装和使用说明书 ..............................................462
Bahasa Indonesia (ID)
Petunjuk pengoperasian dan pemasangan.............................478
Macedonian (MK)
Упатства за монтирање и ракување ................................496
(AR) ةيبرعلا
    .............................................515
Appendix A..................................................532
4UNILIFT APG
Table of contents

English (GB) Installation and operating instructions
Original installation and operating instructions
Table of contents
1. General information ............. 5
1.1 Hazard statements .............. 5
1.2 Notes ..................... 6
2. Product introduction ............ 6
2.1 Product description .............. 7
2.2 Intended use ................. 7
2.3 Pumped liquids ................ 7
2.4 Identification.................. 7
3. Receiving the product............ 8
4. Installation requirements .......... 8
4.1 Location .................... 8
5. Mechanical installation ........... 9
5.1 Foundation .................. 9
5.2 Lifting the product ............... 9
5.3 Positioning of the product........... 9
5.4 Installation on auto coupling .........10
5.5 Free-standing installation ...........11
5.6 Adjustment of the float switch cable
length .....................11
6. Electrical connection ............12
6.1 Checking the direction of rotation ......13
7. Starting up the product ...........14
8. Servicing the product ............14
8.1 Maintaining the product............15
8.2 Oil .......................15
8.3 Construction..................15
8.4 Service kits ..................16
8.5 Maintenance schedule ............17
8.6 Adjusting the impeller clearance .......17
8.7 Replacing the grinder system.........17
8.8 Changing the oil................18
8.9 Contaminated pumps .............19
9. Fault finding .................20
9.1 The motor does not start ...........20
9.2 The motor protection or thermal relay
trips after a short time of operation ......20
9.3 The pump runs constantly or gives too
little water ...................21
9.4 The pump runs but gives no water ......21
10. Technical data ................22
10.1 Storage temperature .............22
10.2 Operating conditions .............22
10.3 Sound pressure level .............22
11. Disposing of the product ..........22
1. General information
This appliance can be used by children
aged from 8 years and above and persons
with reduced physical, sensory or mental
capabilities or lack of experience and
knowledge if they have been given super-
vision or instruction concerning use of the
appliance in a safe way and understand
the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not
be made by children without supervision.
Read this document before you install the
product. Installation and operation must
comply with local regulations and accepted
codes of good practice.
1.1 Hazard statements
The symbols and hazard statements below may
appear in Grundfos installation and operating
instructions, safety instructions and service
instructions.
DANGER
Indicates a hazardous situation which, if
not avoided, will result in death or serious
personal injury.
WARNING
Indicates a hazardous situation which, if
not avoided, could result in death or seri-
ous personal injury.
CAUTION
Indicates a hazardous situation which, if
not avoided, could result in minor or mod-
erate personal injury.
The hazard statements are structured in the following
way:
SIGNAL WORD
Description of the hazard
Consequence of ignoring the warning
• Action to avoid the hazard.
5
English (GB)

1.2 Notes
The symbols and notes below may appear in
Grundfos installation and operating instructions,
safety instructions and service instructions.
A blue or grey circle with a white graphical
symbol indicates that an action must be
taken.
A red or grey circle with a diagonal bar,
possibly with a black graphical symbol, in-
dicates that an action must not be taken or
must be stopped.
If these instructions are not observed, it
may result in malfunction or damage to the
equipment.
Tips and advice that make the work easier.
2. Product introduction
3
4
5
6
1
2
TM081492
UNILIFT APG
Pos. Description
1 Power cable
2 Float switch
3 Handle with cable clamps
4 Nameplate
5 Outlet
6 Inlet
6
English (GB)

2.1 Product description
The Grundfos UNILIFT APG pump is designed for
pumping wastewater. The compact design makes the
pump suitable for both temporary and permanent
installation. The pump can be installed on an auto-
coupłing system or stand freely on the bottom of the
pit.
2.2 Intended use
The Grundfos UNILIFT APG pump is a single-stage
submersible pump designed for
pumping wastewater. APG pumps are designed with
a grinder system that grinds solid particles into
small pieces so that they can be led away through
pipes of a relatively small diameter. The pumps are
used in pressurised systems, for example, in
hilly areas.
2.3 Pumped liquids
The pump is capable of pumping water containing a
limited quantity of spherical particles.
The pump is not suitable for the following liquids:
• Liquids containing long fibres
• inflammable liquids (oil, petrol, etc.)
• aggressive liquids.
Related information
10.1 Storage temperature
2.4 Identification
2.4.1 Nameplate, UNILIFT APG
DK - 8850 Bjerringbro Denmark
21 0197
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
TM081769
Nameplate, UNILIFT APG
Pos. Description
1 Product type
2 Product number
3 Supply voltage
4 Voltage tolerance
5 Power consumption
6 Max. current
7 Max. flow rate
8 Max. head
9Factory code and production code (year and
week)
10 Insulation class
11 Serial number
12 Max. installation depth [m]
13 Net weight [kg]
14 Enclosure class
15 Cosinus phi
16 Speed of rotation
17 Frequency
18 Marks of approval
19 Max. liquid temperature
7
English (GB)

2.4.2 Type key, UNILIFT APG
Example: UNILIFT APG.40.10.A1. 1x220-240V SCH
Code Explanation Designation
UNILIFT
APG Product name
40 Nominal diameter
of the outlet
10 Power output,
P2 / 100 [W]
[ ]
Manual operation
without float
switch Level control
A
Automatic opera-
tion with float
switch
1 Single-phase Motor type
3 Three-phase
1 x 230 V
Nominal voltage
1 x 220 -
240 V
3 x 220 V
3 x 380 V
3 x 400 V
[ ] No plug
Plug type
SCH Europe - F type
wall plug
ARG
Argentina - IRAM
approved I type
wall plug
AUS
Australia, New
Zealand - I type
wall plug
3. Receiving the product
WARNING
Falling objects
Death or serious personal injury
‐Keep the product in a stable position
during unpacking.
‐Wear personal protective equipment.
• Check that the product received is in accordance
with the order.
• Check that the voltage and frequency of the
product match voltage and frequency of the
installation site.
4. Installation requirements
CAUTION
Toxic material
Minor or moderate personal injury
‐The product will be classified as conta-
minated if it has been used for a liquid
which is injurious to health or toxic.
Wear personal protective equipment.
Installation must be carried out by special-
ly trained persons and according to local
regulations.
4.1 Location
Always have at least 3 m free cable above liquid
level. The installation depth for this product is 7 m.
4.1.1 Minimum space
The pit, basin or tank must be sized according to the
relation between the water flow to the pit, basin or
tank and the pump performance.
When the pump is installed in a permanent
installation with a float switch, the minimum
dimensions of the pit, basin or tank must be as shown
in the figure below to ensure free movability of the
float switch. The float switch is set to the minimum
free cable length.
700 mm x 700 mm
TM081338
Minimum pit dimensions when the float switch is set
to the minimum free cable length
Related information
5.6 Adjustment of the float switch cable length
8
English (GB)

5. Mechanical installation
CAUTION
Sharp element
Minor or moderate personal injury
‐Wear personal protective equipment.
‐Make sure that persons cannot come
into contact with the pump impeller.
Do not install the pump hanging from the
electric cable or the outlet pipe.
5.1 Foundation
Before installation, check that the bottom of the tank
is flat and uniform. We recommend to create a
support surface that is as solid as possible.
TM081415
Foundation of the product
5.2 Lifting the product
Do not pull or lift the product by the power
cable or by the outlet pipe or hose.
• Lift the pump using the pump handle.
• If the pump is installed in a well or tank, lower and
lift it by means of a wire or chain fastened to the
pump handle. The handle is provided with two
lateral holes which may be used to lift the pump.
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TM081445
Lifting the product
5.3 Positioning of the product
The pump can only be used in a vertical position. See
the figure below.
TM081576
Position of the pump
When the pipe or hose has been connected, place
the pump in its operating position.
In case of a permanent installation, the pit must be
cleared of pebbles and other hard materials before
the pump is installed in order to prolong the operating
time of the knife inside the pump.
Related information
5.6 Adjustment of the float switch cable length
9
English (GB)

5.4 Installation on auto coupling
See the appendix for drawing of auto-coupling
dimensions.
Pumps for permanent installation can be mounted on
a stationary auto-coupling guide-rail system or a
hookup auto-coupling system.
Both auto-coupling systems facilitate maintenance
and service as the pump can easily be lifted out of the
pit.
DANGER
Toxic material
Death or serious personal injury
‐Before installation, make sure that the
atmosphere in the pit is not toxic or in
lack of oxygen.
Use loose flanges to ease the installation and to
avoid pipe tension at flanges and bolts.
Make sure that the pipes are installed with-
out undue force. No loads from the weight
of the pipes must be carried by the pump.
Do not use elastic elements or bellows in
the pipes. Never use these elements to
align the pipes.
5.4.1 Installing an auto-coupling guide-rail system
Proceed as follows:
1. Drill mounting holes for the guide-rail bracket on
the inside of the pit, and fasten the guide-rail
bracket provisionally with two anchor bolts.
2. Place the auto-coupling base unit on the bottom
of the pit. Use a plumb line to establish the correct
positioning. Fasten the auto coupling with heavy-
duty anchor bolts. If the bottom of the pit is
uneven, the auto-coupling base unit must be
supported.
3. Connect the outlet pipe in accordance with the
generally accepted procedures. Avoid exposing
the pipe to distortion or tension.
4. Place the guide rails in the auto-coupling base
unit, and adjust the length of the rails accurately to
the guide-rail bracket at the top of the pit.
5. Unscrew the fastened guide-rail bracket, fit it on
top of the guide rails and finally fasten it firmly to
the pit wall.
The guide rails must not have any axial
play as this may cause noise during
pump operation.
6. Clean out debris from the pit before lowering the
pump into the pit.
7. Fit the guide claw to the pump outlet. Grease the
gasket of the guide claw before lowering the pump
into the pit.
8. Mount the lifting shackle and the lifting chain to
the handle of the pump on the opposite side of the
auto coupling.
TM081587
Attachment of chain to pump handle.
9. Slide the guide claw between the guide rails and
lower the pump into the pit by the chain. When the
pump reaches the auto-coupling base unit, the
pump will automatically connect tightly. When the
pump has reached the auto-coupling base unit,
shake the pump by the chain to make sure that it
is placed in the correct position.
10. Hang up the end of the chain on a suitable hook
at the top of the pit so the chain cannot touch the
pump housing.
11. Adjust the length of the power cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation. Fasten the relief fitting
to a suitable hook at the top of the pit. Make sure
that the cable is not sharply bent or pinched.
12. Connect the power cable and the control cable, if
any.
The free end of the cable must not be sub-
merged as water may penetrate through
the cable into the motor.
10
English (GB)

5.5 Free-standing installation
See the appendix for dimensional drawing.
For free-standing installation of the pumps, fit a 90°
elbow to the outlet. The pump can be installed with a
rigid pipe and valves.
In order to facilitate service of the pump, fit a flexible
connection or coupling to the outlet pipe for easy
separation.
If a rigid pipe is used, the union or coupling, non-
return valve and isolating valve must be fitted in the
sequence mentioned, as seen from the pump side.
A flexible element in the tubing is also needed in
order to separate the pipe vibration and sound from
the system.
If the pump is installed in muddy conditions or on
uneven ground, we recommend that you support the
pump on some solid platforms.
5.6 Adjustment of the float switch cable
length
For pumps with a float switch, the difference in level
between start and stop can be adjusted by changing
the free cable length between the float switch and the
pump handle.
• An increased free cable length will result in fewer
starts and stops and a large difference in level.
• A reduced free cable length will result in more
frequent starts and stops and a small difference in
level.
The stop level must be above the pump inlet to
prevent the pump from taking in air.
The start level must be below the liquid in-
let of the pit to avoid backflow into the sys-
tem.
32
1
TM081336
Start and stop levels
Pos. Description
1 Stop
2 Start
3 Cable length (L)
The start and stop levels vary according to the cable
length.
Cable length (L)
[mm]
Start
[mm]
Stop
[mm]
100 (minimum
length) 560 360
260 (maximum
length) 580 250 (only intermit- tent operation)
Intermittent operation
During intermittent operation, the motor must
always have a minimum liquid level of 250 mm from
the bottom.
Continuous operation
During continuous operation, the motor and the pump
inlet must always have a minimum liquid level of 360
mm from the bottom.
Related information
4.1.1 Minimum space
5.3 Positioning of the product
9.4 The pump runs but gives no water
11
English (GB)

6. Electrical connection
DANGER
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product.Make
sure that the power supply cannot be
switched on accidentally.
DANGER
Electric shock
Death or serious personal injury
‐The installation must be fitted with a re-
sidual-current device (RCD) with a trip-
ping current less than 30 mA.
DANGER
Electric shock
Death or serious personal injury
‐Make sure that the power supply plug
delivered with the product is in compli-
ance with local regulations.
‐The plug must have the same protec-
tive earth (PE) connection system as
the power outlet. If not, use a suitable
adapter if allowed by local regulations.
DANGER
Electric shock
Death or serious personal injury
‐Power cables without a plug must be
connected to a supply disconnecting
device incorporated in the fixed wiring
according to the local wiring rules.
All electrical connections must be carried
out by a qualified electrician in accordance
with local regulations.
Depending on local regulations, a pump
with minimum 10 m of mains cable must
be used if the pump is used as a portable
pump for different applications.
Make sure that the product is suitable for the supply
voltage and frequency available at the installation
site. Voltage and frequency are marked on the pump
nameplate.
The pump must be connected to an external main
switch. If the pump is not installed close to the switch,
the switch must be of a lockable type.
Three-phase pumps must be connected to an
external motor-protective circuit breaker with a
differential release. The rated current of the motor-
protective circuit breaker must correspond to the
electrical data marked on the pump nameplate.
If a float switch is connected to a three-phase pump,
the motor-protective circuit breaker must be
magnetically operated.
Single-phase pumps incorporate thermal overload
protection and require no additional motor protection.
If the single-phase motor is overloaded, it
stops automatically. When the motor has
cooled to normal temperature, it restarts
automatically.
MAIN
AUX.
T
YELLOW-GREEN
BROWN
BLUE
RED
BLACK
BLUE
Capacitor
LN
1
TM081330
Electrical wiring, single-phase.
L1 L2 L3
15
313
A1
T1 T2 T3
26
4
26
414
F2
A2
I
F1
OReset/Off
W2 W1
98NO
12
TM082186
Electrical wiring with control box, three-phase.
12
English (GB)

Pos. Description
1 Float switch
2 Motor
6.1 Checking the direction of rotation
Three-phase pumps only
CAUTION
Sharp element
Minor or moderate personal injury
‐Do not touch the sharp edges of the
impeller, grinder head and grinder ring
without wearing protective gloves.
The impeller rotates counterclockwise.
When started, the pump jerks clockwise.
Check the direction of rotation every time the pump is
connected to a new installation.
1. Let the pump hang from a lifting device, such as
the hoist used for lowering the pump into the pit.
DANGER
Rotating parts
Death or serious personal injury
‐Keep hands away from the bottom
of the pump while checking the di-
rection of the rotation.
2. Start and stop the pump while observing the
movement (jerk) of the pump.
3. If connected correctly, the pump will jerk
clockwise.
The correct direction of rotation is indicated by an
arrow on the bottom pump base
(counterclockwise when seen from the bottom).
TM081442
Check the direction
4. If the impeller rotates in the wrong direction,
reverse the direction of rotation by interchanging
two of the phases to the motor.
If the pump is connected to a pipe system, check the
direction of rotation in this way:
13
English (GB)

1. Start the pump and check the quantity of water or
the pressure.
2. Stop the pump and interchange two of the phases
to the motor.
3. Start the pump and check the quantity of water or
the pressure.
4. Stop the pump.
5. Compare the results taken under points 1 and 3.
The largest quantity of water indicates the correct
direction of rotation.
Related information
9.2 The motor protection or thermal relay trips after
a short time of operation
9.3 The pump runs constantly or gives too little
water
7. Starting up the product
DANGER
Electric shock
Death or serious personal injury
‐Do not use the pump in swimming
pools, garden ponds or similar places if
there are people in the water.
The pump may be run briefly to check the
direction of rotation without being sub-
merged in the pumped liquid.
1. Before starting the pump, submerge the pump
inlet in the pumped liquid.
2. Open the isolating valve, if fitted, and check the
float switch setting.
8. Servicing the product
DANGER
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product.Make
sure that the power supply cannot be
switched on accidentally.
CAUTION
Sharp element
Minor or moderate personal injury
‐Wear personal protective equipment.
CAUTION
Toxic material
Minor or moderate personal injury
‐Wear personal protective equipment.
CAUTION
Biological hazard
Minor or moderate personal injury
‐Flush the product thoroughly with clean
water and rinse the parts in water after
dismantling.
‐Wear personal protective equipment.
If the power cable or the float switch is
damaged, it must be replaced by a service
workshop authorised by Grundfos.
Service must be carried out by specially
trained persons.
Furthermore, all rules and regulations cov-
ering safety, health and environment must
be observed.
1. If the pump has been used for liquids other than
clean water, flush the pump thoroughly with clean
water before carrying out maintenance and
service.
2. Rinse the pump parts in water after dismantling.
For detailed service information, see http://
net.grundfos.com/qr/i/92678389.
QR92678389
14
English (GB)

8.1 Maintaining the product
• Check the pump and replace the oil once a year. If
the pump is used for pumping liquids containing
abrasive particles or it is operating continuously,
the pump must be checked at shorter intervals.
• If the drained oil contains water or other
impurities, we recommend that you replace the
shaft seal. Contact Grundfos Service.
8.2 Oil
In the case of long operating time or continuous
operation, the oil must be replaced as follows:
Liquid tempera-
ture The oil must be replaced after
20 °C 4500 operating hours
40 °C 3000 operating hours
The pump contains 140 ml of non-poisonous oil. Use
MARCOL 152 ESSO oil or equivalent type.
Used oil must be disposed of in accordance with local
regulations.
Related information
8.8 Changing the oil
8.3 Construction
The construction of the pump will appear from the
table below and the sectional drawing in the
appendix.
Pos. Description
9a Spline
12c Set screw
26 Screw
31 Plate
34 Screw
37 O-ring
44 Grinder ring
44a Screw
45 Grinder head
49 Impeller
50 Pump housing
66 Washer
67a Plug, power cable
67b Plug, float switch cable
84 Base
86 Cable gland plate
150 Motor with flange
157 O-ring
160 Top compartment
161 Capacitor
169 Guide
181 Power cable
182 Float switch
184b Screw
188a Screw
190 Pump handle
193 Screw
194 O-ring
970 Nameplate
15
English (GB)

8.4 Service kits
The following service kits are available for all pumps.
Service kit Contents Pos. O-ring mate-
rial
Product num-
ber
Impeller 49, 9a, 66,
188a 92693611
Grinder parts 45, 44, 44a,
66, 188a 92693612
Set of screws 5 × M8, 3 × M6 26, 12c 92693631
O-ring kit NBR 194, 157, 37 92693638
Motor kit
Complete motor, single-phase, 220-240 V, 50
Hz
150, 190, 34,
86, 193, 194,
157, 37, 184b
NBR
92693542
Complete motor, single-phase, 220-240 V, 50
Hz, without hole for float switch 92701743
Complete motor, single-phase, 230 V, 50 Hz 92693544
Complete motor, single-phase, 230 V, 50
Hz, without hole for float switch 92701745
Complete motor, three-phase, 220 V 50 Hz 92701748
Complete motor, three-phase, 220 V 50
Hz, without hole for float switch 92701747
Complete motor, three-phase, 380V 50 Hz 92701760
Complete motor, three-phase, 380 V 50
Hz, without hole for float switch 92701746
Complete motor, three-phase, 400 V 50 Hz 92701761
Complete motor, three-phase, 400 V 50
Hz, without hole for float switch 92693545
Capacitor (230 V) 161, 194, 157 92695572
Cables
Cable, single-phase without a plug
181, 34, 86,
194, 157 NBR
92693615
Cable, single-phase with AU plug 92697765
Cable, single-phase with ARG plug 92697766
Cable, single-phase with SCHUKO plug 92697767
Cable, three-phase 92693617
Float switch 92695571
16
English (GB)

8.5 Maintenance schedule
Inspect pumps running normal operation every 3000
operating hours or at least once a year. If the dry-
solids content of the pumped liquid is very high or
sandy, check the pump at shorter intervals.
Check the following:
•Power consumption
See the nameplate.
•Oil level and oil condition
When the pump is new or after replacement of the
shaft seal, check the oil level after one week of
operation.
Use MARCOL 152 ESSO oil or equivalent type.
Oil auto-ignition temperature must be above 180
°C.
•Cable entry
Make sure that the cable entry is wa-
tertight and that the cables are not
sharply bent and/or pinched.
•Pump parts
Check the wearing parts, for example, impeller
and pump housing. Replace defective parts.
•Grinder system and parts
In case of frequent choke-ups, check the grinder
system for visible wearing. If necessary, replace
the grinder system.
8.6 Adjusting the impeller clearance
For position numbers in brackets, see exploded
drawing in the appendix.
Proceed as follows:
1. Loosen the set screws fully (12c).
2. Gently tighten the screws (26).
3. Gently tighten the set screws (12c).
4. Loosen the screws (26) with at least three turns.
5. Tighten the set screw (12c) by 180°.
6. Tighten the screws (26) with a torque of 7 Nm.
Related information
8.8 Changing the oil
8.7 Replacing the grinder system
CAUTION
Sharp element
Minor or moderate personal injury
‐Wear protective gloves when touching
the sharp edges of the impeller, grinder
head and grinder ring.
For position numbers in brackets, see the exploded
drawing in the appendix.
Proceed as follows:
Dismantling
1. Loosen the screw (44a) that holds the grinder ring
in place.
2. Loosen the grinder ring (44) and open the
bayonet socket by knocking or turning the grinder
ring 15 to 20° clockwise. See the figure below.
TM081555
Removing the grinder ring
3. Gently prise the grinder ring (44) out of the pump
housing with a screwdriver.
Make sure that the grinder ring does
not get stuck against the grinder head.
4. Use a plier to hold the grinder head.
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English (GB)

5. Loosen and remove the screw (188a) and the
locking ring (66) in the shaft end.
TM081602
Loosen the grinder head
6. Remove the grinder head (45).
Assembly
1. When fitting the grinder head (45), the projections
on the back of the grinder head must engage with
the holes in the impeller (49).
2. Tighten the screw (188a) for the grinder head with
a torque of 10 Nm. Do not forget the lock washer.
3. Fit the grinder ring (44).
4. Turn the grinder ring (44) 15 to 20°
counterclockwise until it is tightened.
5. Tighten the screw (44a) with a torque of 7 Nm.
6. Check that the grinder rotates freely.
8.8 Changing the oil
1. Loosen and remove 4 screws (26) and lift away
the pump base (84).
2. Use a plier to hold the grinder head and loosen
and remove the screw (188a) and the locking ring
(66) in the shaft end.
3. Remove the grinder head (45).
4. Pull the impeller (49) away from the shaft.
Remember to remove and collect the key (9a).
5. Loosen and remove the screw (184b) and lift
away the pump housing.
6. Raise the pump so the shaft end faces upwards.
7. Unscrew and remove the oil plug.
AB
TM1040045
Oil plug position
Pos. Description
A Oil plug
B O-ring
8. Tilt the pump to let the oil flow out of the oil
drainage hole and catch it in a tray.
Used motor oil must be disposed of in
accordance with local regulations.
9. Analyse the oil: If any particles of abrasive
materials, for example sand, or water are found in
the oil, we recommend you to check the condition
of the mechanical seal and to have it changed if
necessary at a Grundfos Service Center. In this
case also change the oil with about 140 ml of oil,
type MARCOL 152 ESSO.
10. Add oil using a funnel inserted in the drain hole.
The total amount of oil to use is 140 ml.
11. Mount and tighten the oil plug with a torque of
2.5 ± 0.2 Nm.
12. Reassembly the pump in the reverse order of the
dismantling.
13. Adjust the impeller clearance.
Related information
8.2 Oil
8.6 Adjusting the impeller clearance
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English (GB)

8.9 Contaminated pumps
CAUTION
Biological hazard
Minor or moderate personal injury
‐Flush the product thoroughly with clean
water and rinse the parts in water after
dismantling.
‐Wear personal protective equipment.
The product will be classified as contaminated if it has
been used for a liquid which is injurious to health or
toxic. If you request Grundfos to service the product,
contact Grundfos with details about the pumped liquid
before returning the product for service. Otherwise,
Grundfos can refuse to accept the product for service.
Any application for service must include details about
the pumped liquid.
Clean the product in the best possible way before you
return it. Costs of returning the product are to be paid
by the customer.
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English (GB)

9. Fault finding
DANGER
Electric shock
Death or serious personal injury
‐Switch off the power supply before you
start any work on the product.Make
sure that the power supply cannot be
switched on accidentally.
CAUTION
Sharp element
Minor or moderate personal injury
‐Wear personal protective equipment.
CAUTION
Toxic material
Minor or moderate personal injury
‐The product will be classified as conta-
minated if it has been used for a liquid
which is injurious to health or toxic.
‐Wear personal protective equipment.
9.1 The motor does not start
Cause Remedy
No power supply. Connect the power supply.
The pump was stopped by the float switch. Adjust or replace the float switch.
The fuses have blown. Replace the fuses.
The motor protection or thermal relay has tripped. Wait until the motor protection trips in again or reset the
relay.
The impeller is blocked by impurities. Clean the impeller.
Short circuit in the cable or motor. Replace the defective part.
9.2 The motor protection or thermal relay trips after a short time of operation
Cause Remedy
The liquid temperature is too high. Use another pump type. Contact your local Grundfos
supplier or sales support.
The impeller is blocked or partly blocked by
impurities.
Clean the pump.
Phase failure. Call an electrician.
Too low voltage. Call an electrician.
The overload setting of the motor-protective circuit
breaker is too low.
Adjust the setting.
Incorrect direction of rotation. Reverse the direction of rotation.
Related information
6.1 Checking the direction of rotation
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English (GB)