Grundfos UNILIFT AP35B User manual

Unilift AP35B, AP50B
Installation and operating instructions
GRUNDFOS INSTRUCTIONS

English (GB)
2
English (GB) Installation and operating instructions
Original installation and operating instructions
CONTENTS
Page
1. Symbols used in this document
2. General description
Fig. 1 Unilift AP35B, AP50B
1. Symbols used in this document 2
2. General description 2
2.1 Applications 3
2.2 Storage and operating conditions 3
2.3 Sound pressure level 3
3. Safety 4
4. Electrical connection 4
4.1 Checking the direction of rotation 4
5. Installation 5
5.1 Pipe connection 5
5.2 Pump location 5
5.3 Installation on auto coupling 6
5.4 Free-standing installation 6
5.5 Setting of level switch 6
6. Startup 7
7. Maintenance and service 7
7.1 Oil 7
7.2 Construction 7
7.3 Service kits 7
7.4 Contaminated pumps 7
8. Fault finding the product 8
9. Disposal 9
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.
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.
TM03 4189 1806
Handle
with clamp
Outlet
Inlet
Level
switch

English (GB)
3
2.1 Applications
The Grundfos Unilift AP pump is are single-stage
submersible pumps designed for the pumping of
wastewater.
The pump is capable of pumping water which
contains a limited quantity of solids, however not
stones and similar materials, without being blocked
or damaged.
The pump is available for automatic as well as
manual operation and can be installed in a
permanent installation (on auto coupling or as a free-
standing pump) or used as a portable pump.
The pump is suitable for these applications:
Incorrect application of the pump (e.g. resulting in
blocking of the pump) and wear are not covered by
the warranty.
2.2 Storage and operating conditions
2.3 Sound pressure level
The sound pressure level of the pump is lower than
the limiting values stated in the EC Council Directive
2006/42/EC relating to machinery.
Applications Unilift
AP35B
Unilift
AP50B
Groundwater lowering 
Pumping in drainage pits 
Pumping in surface water pits
with inflow from roof gutters,
shafts, tunnels, etc. 
Emptying of ponds, tanks, etc. 
Pumping of fibre-containing
wastewater from laundries
and industries 
Pumping of domestic
wastewater from septic tanks
and sludge treating systems 
Pumping of domestic
wastewater without discharge
from water closets 
Pumping of domestic
wastewater with discharge
from water closets 
Maximum particle size [mm] 35 50
Warning
The pump must not be used in or at
swimming pools, garden ponds, etc. when
there are persons in the water.
Storage temperature Down to -30 °C
Minimum liquid
temperature 0 °C
Maximum liquid
temperature 40 °C
Installation depth Maximum 7 metres below
liquid level
pH value 4-10
Density Maximum 1100 kg/m3
Viscosity Maximum 10 mm2/s
Technical data See pump nameplate.
Caution
Always have at least 3 m free cable above
liquid level. This limits installation depth to
7 m for pumps with 10 m cable and to 2 m
for pumps with 5 m cable.
Caution
Pumps with 3 m cable are for industrial
applications only.

English (GB)
4
3. Safety
4. Electrical connection
Note: Depending on local regulations, a pump with
10 metres of mains cable must be used if the pump
is used as a portable pump for different applications.
The electrical connection must be carried out in
accordance with local regulations.
The operating voltage and frequency are marked on
the pump nameplate. Make sure that the motor is
suitable for the power supply on which it will be used.
Three-phase pumps must be connected to an
external motor-protective circuit breaker with
differential release. The rated current of the motor-
protective circuit breaker must correspond to the
electrical data marked on the pump nameplate.
If a level 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.
Note: If the motor is overloaded, it will stop
automatically. When the motor has cooled to normal
temperature, it restarts automatically.
4.1 Checking the direction of rotation
Three-phase pumps only
Check the direction of rotation every time the pump
is connected to a new installation.
1. Position the pump so that you can observe the
impeller.
2. Start the pump for a short period.
3. Observe the rotation of the impeller. The correct
direction of rotation is indicated by an arrow on
the top of the motor (clockwise when seen from
the bottom). 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:
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 connection which gives the larger quantity of
water or the higher pressure is the correct
direction of rotation.
Warning
Pump installation in wells must be carried
out by specially trained persons.
Warning
As a precaution, the pump must be
connected to a socket with earth
connection. The installation must be fitted
with an earth leakage circuit breaker
(ELCB) with a tripping current less then 30
mA.
The pump must be connected to an
external mains switch with a minimum
contact gap of 3 mm in all poles. If the
pump is not installed close to the switch,
the switch must be of a lockable type.

English (GB)
5
5. Installation
5.1 Pipe connection
For permanent installation, we recommend that you
fit a union, a non-return valve and an isolating valve
in the outlet pipe.
If the pump is installed in a pit with a minimum free
cable length of 100 mm, see fig. 5, the minimum pit
dimensions must be as shown in fig. 2.
Furthermore, the pit must be dimensioned according
to the relation between the water flow to the pit and
the pump performance.
Fig. 2 Minimum pit dimensions in pit if
minimum free cable length is 100 mm
5.2 Pump location
The pump can be used in vertical or horizontal
position. See fig. 3.
During continuous operation, the motor and the
pump inlet must always be completely covered by
the pumped liquid.
Fig. 3 Position of pump
When the pipe/hose has been connected, place the
pump in its operating position.
Note: Never lift the pump by the power supply cable.
Position the pump so that the pump inlet will not be
blocked or partly blocked by sludge, mud or similar
materials.
We recommend that you place the pump on a solid
base. See fig. 4.
Fig. 4 Place pump on a solid base
In the case of permanent installation, the pit must be
cleared of sludge, pebbles, etc. before the pump is
installed.
Warning
The installation of the pump must be
carried out by specially trained persons.
Care must be taken to ensure that persons
cannot come into contact with the pump
impeller.
Note
According to EN 60335-2-41/A2:2010, this
product with 5 metres of mains cable may
be used only for indoor applications.
TM03 4190 1806
550 mm
600 mm
TM03 4191 1806TM01 3597 4998
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English (GB)
6
5.3 Installation on auto coupling
See figs A and B, pages 10 and 11.
Pumps for permanent installation can be installed on
a stationary auto coupling and operated completely
or partially submerged in the pumped liquid.
1. Drill mounting holes for guide rail bracket on the
inside of the pit and fasten the guide rail bracket
provisionally with two screws.
2. Place the auto coupling base unit on the bottom
of the pit. Use a plumb line to establish the
correct positioning. Fasten with heavy-duty
expansion bolts. If the bottom of the pit is
uneven, the auto coupling base unit must be
supported so that it is level when being fastened.
3. Assemble the outlet line in accordance with the
generally accepted procedures and without
exposing the line to distortion or tension.
4. Knock the guide rails on to the spigots of the
bottom part of the auto coupling. Bevel the inside
of the guide rails to facilitate installation. The
guide rails must fit tightly on the spigots. We
recommend 3/4" medium size pipes as guide
rails.
5. Adapt the length of the guide rails to fit precisely
the bracket at the top.
6. Unscrew the provisionally fastened guide rail
bracket, fit it on top of the guide rails and finally
fasten it firmly to the pit wall.
Note: The guide rails must not have any axial play
as this would cause noise during pump operation.
7. Clean out debris from the pit before lowering the
pump into the pit.
8. Fit the auto-coupling half on to the outlet of the
pump. Then slide the guide bar of this coupling
half between the guide rails and lower the pump
into the pit by means of a chain. When the pump
reaches the auto-coupling base unit, the pump
will automatically connect tightly.
9. Hang up the end of the chain on a suitable hook
at the top of the pit.
10. Adjust the length of the motor cable by coiling it
up on a relief fitting, so the cable is not damaged
during operation. Fasten the relief fitting to a
suitable bracket at the top of the pit. Make sure
that the cables are not sharply bent or pinched.
Note: The end of the cable must not be submerged,
as water may penetrate through the cable into the
motor.
5.4 Free-standing installation
See fig. C, page 12.
For free-standing installation of the pumps, fit a 90 °
elbow to the outlet. The pump can be installed with a
hose or rigid pipe and valves.
In order to facilitate service of the pump, fit a flexible
union or coupling to the outlet pipe for easy
separation.
If a hose is used, make sure that the hose does not
buckle and that the inside diameter of the hose
matches that of the outlet.
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.
Lower the pump into the liquid.
If the pump is installed in muddy conditions or on
uneven ground, we recommend that you support the
pump on bricks.
5.5 Setting of level switch
Intermittent operation
For pumps supplied with a level switch, the
difference in level between start and stop can be set
by adjusting the free cable between the level switch
and the pump handle.
The longer the length of free cable, the larger the
difference in level between start and stop.
The pump is allowed to run for maximum 5 minutes
per 30 minutes without the motor being submerged
in the liquid.
Fig. 5 Setting of level switch
Continuous operation
During continuous operation, the pump must always
be completely covered by the pumped liquid.
TM03 4192 1806
270 mm
Stop

English (GB)
7
6. Startup
Before starting the pump, submerge the pump inlet
in the pumped liquid.
Open the isolating valve, if fitted, and check the level
switch setting.
7. Maintenance and service
Before carrying out maintenance and service, it must
be ensured that the pump has been thoroughly
flushed with clean water. Rinse the pump parts in
water after dismantling.
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.
7.1 Oil
The pump contains approx. 60 ml non-poisonous oil.
Used oil must be disposed of in accordance with
local regulations.
If the drained oil contains water or other impurities,
we recommend that you replace the shaft seal.
7.2 Construction
The construction of the pump will appear from the
table below and fig. D, page 13.
7.3 Service kits
7.4 Contaminated pumps
If you request Grundfos to service the pump, contact
Grundfos with details about the pumped liquid, etc.
before you return the pump for service. Otherwise
Grundfos can refuse to accept the pump for service.
Possible costs of returning the pump are paid by the
customer.
However, any application for service (no matter to
whom it may be made) must include details about
the pumped liquid if the pump has been used for
liquids which are injurious to health or toxic.
Note
The pump may be run briefly to check the
direction of rotation without being
submerged in the pumped liquid.
Warning
Before starting any work on the product,
make sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
Warning
Out of consideration for the personal
safety and health, this work must be
carried out by specially trained persons.
Furthermore, all rules and regulations
covering safety, health and environment
must be observed.
Be careful during dismantling as you will
get access to sharp edges, etc., which
may cause cuts. Wear protective gloves.
A possible replacement of the cable or the
level switch must be carried out by an
authorised Grundfos service workshop.
Pos. Description
50 Pump housing
37a O-ring
49 Impeller
150 Motor with flange
66 Washer
84 Base
67 Lock nut
6Inletpart
105a Shaft seal
182 Level switch
Service kit Part number
Shaft seal, standard 96429307
Shaft seal, FKM 96429308
Oil 96010646
If a pump has been used for a liquid which
is injurious to health or toxic, the pump will
be classified as contaminated.

English (GB)
8
8. Fault finding the product
Warning
Before starting any work on the product,
make sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
Fault Cause Remedy
1. The motor does not
start.
a) No power supply. Connect the power supply.
b) The pump was stopped by the level
switch. Adjust or replace the level switch.
c) The fuses have blown. Replace the fuses.
d) The motor protection/thermal relay has
tripped.
Wait until the motor protection
trips in again/reset the relay.
e) The impeller is blocked by impurities. Clean the impeller.
f) Short circuit in the cable or motor. Replace the defective part.
2. The motor protection/
thermal relay trips
after a short time of
operation.
a) The liquid temperature is too high. Use another pump type.
b) Impeller blocked or partly blocked by
impurities. Clean the pump.
c) Phase failure. Call an electrician.
d) Too low voltage. Call an electrician.
e) Overload setting of the motor-protective
circuit breaker too low. Adjust the setting.
f) Incorrect direction of rotation. See
section 4.1 Checking the direction of
rotation.
Reverse the direction of rotation.
3. The pump runs
constantly or gives
too little water.
a) The pump is partly blocked by
impurities. Clean the pump.
b) The outlet pipe or valve is partly
blocked by impurities. Clean the outlet pipe.
c) The impeller is not properly fixed to the
shaft. Tighten the impeller.
d) Incorrect direction of rotation. See
section 4.1 Checking the direction of
rotation.
Reverse the direction of rotation.
e) Incorrect setting of level switch. Adjust the level switch.
f) The pump is too small for the
application. Replace the pump.
g) The impeller is worn. Replace the impeller.
4. The pump runs but
gives no water.
a) The pump is blocked by impurities. Clean the pump.
b) The outlet pipe or non-return valve is
blocked by impurities. Clean the outlet pipe.
c) The impeller is not properly fixed to the
shaft. Tighten the impeller.
d) Air in pump. Vent the pump and the outlet
pipe.
e) The liquid level is too low. The pump
inlet is not completely submerged in the
pumped liquid.
Submerge the pump in the liquid
or adjust the level switch.
f) The level switch does not move freely. Make the level switch move
freely.

English (GB)
9
9. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
Subject to alterations.

Appendix
10
Appendix 1
1-pump installation on auto-coupling
Fig. A
TM03 4194 1806
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F
C
A
J
G
K L
N O
T
E
S
U
Z
A B C D E F G I J K
∅600 ∅600 304 135 82 85 65 100 63 150
L M N O P R S T U Z
400 200 300 700 500 - R 2 3/4" 130 261