Grundfos Unilift KP 250 User manual

Unilift KP 150, KP 250, KP 350

Installation and operating instructions

GRUNDFOS INSTRUCTIONS

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http://net.grundfos.com/qr/i/96894217

English (GB)

2

English (GB) Installation and operating instructions

Original installation and operating instructions

CONTENTS Page

1. Symbols used in this document

2. Unilift KP pumps

Grundfos Unilift KP pumps are available in these

versions:

Fig. 1 Pumps with level switch

1. Symbols used in this document 2

2. Unilift KP pumps 2

3. Applications 3

3.1 Pumped liquids 3

4. Functions 3

5. Operating conditions 3

5.1 Sound pressure level 3

6. Installation 4

6.1 Space requirements 4

6.2 Pump positions 4

6.3 Pipe connection 4

6.4 Start/stop level 5

6.5 Electrical connection 5

7. Operation 6

7.1 Unilift KP-A 6

7.2 Unilift KP-AV 6

7.3 Unilift KP-M 6

8. Maintenance 7

8.1 Cleaning the pump 7

8.2 Service 8

9. Fault finding the product 9

10. 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.

• Unilift KP-A with float switch (automatic

operation)

• Unilift KP-AV with vertical level switch

(automatic operation)

• Unilift KP-M without level switch (manual

operation).

TM01 1107 1205

Pos. Description

1 Outlet, Rp 1 1/4

2 Handle

3 Cable clamp

4 Inlet strainer

5 Pump sleeve

6 Float switch

7 Vertical level switch

Unilift KP-A with

float switch

Unilift KP-AV with

vertical level switch

English (GB)

3

3. Applications

Unilift KP 150, KP 250 and KP 350 are single-stage

submersible pumps designed for the pumping of

grey wastewater.

The pump can pump water with a limited content of

solid particles up to 10 mm diameter without being

clogged or damaged.

The pump can be used for automatic as well as

manual operation and is suitable for both permanent

and temporary use.

The pump is suitable for these applications:

• pumping in drain tanks

• pumping of wastewater from washing machines,

baths, sinks, etc. from low-lying parts of buildings

up to sewer level

• drainage of flooded cellars or buildings

• pumping in surface water drain tanks with inlets

from roof gutters, tanks, tunnels, etc.

• emptying of swimming pools, ponds or fountains.

3.1 Pumped liquids

The pump is not suitable for these liquids:

• liquids containing long fibres

• flammable liquids (oil, petrol, etc.)

• aggressive liquids.

4. Functions

Unilift KP-A

Automatic on/off operation via a float switch.

Unilift KP-AV

Automatic start/stop operation via vertical level

switch.

Unilift KP-M

Manual operation via external on/off switch.

5. Operating conditions

Liquid temperature

Minimum 0 °C.

The maximum liquid temperature depends on the

rated voltage of the pump. See the table below.

1) Voltage variant for Unilift KP 350.

2) KP 350: 45.

Storage temperature

-20 - +70 °C.

Installation depth

Maximum 10 m below liquid level.

5.1 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.

Warning

Do not use the pump in or at swimming

pools, garden ponds, etc. when there are

persons in the water.

Note

The pump contains approx. 70 ml of non-

toxic rotor liquid which will be mixed with

the pumped liquid in case of a leak.

Voltage Maximum liquid

temperature

[°C]

1 x 100 V, 50 Hz

1 x 110 V, 50 Hz

1 x 100-110 V, 50 Hz1)

1 x 220-230 V, 50 Hz

1 x 220-240 V, 50 Hz, 50 Hz1)

1 x 230-240 V, 50 Hz

35

40

50

1 x 100 V, 60 Hz

1 x 115 V, 60 Hz

1 x 220 V, 60 Hz

35

502)

40

3 x 200 V, 50 Hz

3 x 380-400 V, 50 Hz1)

3 x 380-415 V, 50 Hz

35

50

3 x 200 V, 60 Hz 35

At intervals of at least 30 minutes, the pumps may,

however, run at maximum 70 °C for periods not

exceeding 2 minutes.

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

6. Installation

6.1 Space requirements

6.1.1 Unilift KP-A

If the pump is installed in a tank, the minimum

dimensions of the tank must be as shown in fig. 2to

ensure free movability of the float switch. Figure 3

shows a pump with vertical level switch.

Fig. 2 Minimum tank dimensions, Unilift KP-A

Fig. 3 Minimum tank dimensions, Unilift KP-AV

6.1.2 Unilift KP-M

The pump requires no more space than the physical

dimensions of the pump. See page 10.

6.2 Pump positions

Unilift KP-A and Unilift KP-M can be used in vertical

position with the outlet pointing upwards. The pumps

may also be used in horizontal or tilted position with

the outlet as the highest point. See fig. 4.

Fig. 4 How to place Unilift KP-A and Unilift KP-

M

Place the pump so that the inlet strainer is not

covered in sludge, mud or similar materials. You can

ensure this by placing the pump on bricks, an iron

plate, or similar. See fig. 5.

Fig. 5 Pump placed on a plate

6.3 Pipe connection

Fit the outlet pipe or hose in the Rp 1 1/4 outlet.

Steel pipes can be screwed directly into the pump

outlet.

In a permanent installation, fit a union to the outlet

pipe to facilitate mounting and removal. If a hose is

used, fit a hose union.

In a permanent installation with level switch, fit a

non-return valve to the outlet pipe or hose.

Caution

Do not install the pump hanging from the

electric cable or the outlet pipe.

Never lift the pump by the power supply

cable. Lift the pump using the pipe/hose or

a rope secured to the pump handle.

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 4445 2106TM01 1109 1098

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400 mm

350 mm

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ø 250 mm

400 mm

∅250 mm

400 mm

TM00 1548 0493

Caution

Always place Unillift KP-AV in vertical

position.

TM00 1549 0493

Caution

The pump must not be installed hanging

from the outlet pipe.

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English (GB)

5

6.4 Start/stop level

6.4.1 Unilift KP-A

The level difference between start and stop can be

adjusted by changing the free cable length between

the pump handle and the float switch.

• A long free cable length gives fewer starts/stops

and a large level difference.

• A short free cable length gives frequent starts/

stops and a small level difference.

To enable the float switch to start and stop the pump,

the free cable length (L) must be minimum 70 mm

and maximum 150 mm. See fig. 6.

Fig. 6 Start/stop levels, Unilift KP-A

6.4.2 Unilift KP-AV

The level difference for pumps with vertical level

switch cannot be adjusted. Start/stop levels appear

from fig. 7.

Fig. 7 Start/stop levels KP-AV

* Unilift KP 350.

6.5 Electrical connection

The electrical connection must be carried out in

accordance with local regulations and standards.

Check that the mains voltage and frequency

correspond to the values stated on the pump

nameplate.

The pump motor incorporates thermal overload

protection and requires no additional motor

protection.

If the motor is overloaded, it will stop automatically.

Motors for Unilift KP 350, 3 x 200 V, 50 Hz, must be

connected to a motor-protective circuit breaker.

Three-phase pumps with float switch (Unilift KP-A)

must be connected to the mains supply by means of

a contactor. See fig. 8.

Fig. 8 Wiring diagram

TM03 4446 2106

Pump type

Cable length

(L)

min. 70 mm

Cable length

(L)

max. 150 mm

Start

[mm] Stop

[mm] Start

[mm] Stop

[mm]

Unilift KP 150 A

Unilift KP 250 A 290 140 335 100

Unilift KP 350 A 300 150 345 110

TM01 1108 3797

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L

Start

Stop

Start

Stop

80 mm

100 mm

Start

80 mm

100 mm (110 mm)*

Stop

Warning

The pump must be connected to an

external mains switch with a minimum

contact gap of 3 mm in all poles.

As a precaution, all pumps must be

connected to a socket with earth

connection.

Warning

The protective earth of the socket outlet

must be connected to the protective earth

of the pump. The plug must therefore have

the same PE connection system as that of

the socket outlet. If not, use a suitable

adapter.

Warning

The installation must be fitted with an earth

leakage circuit breaker (ELCB) with a

tripping current less than 30 mA.

Note

When the motor has cooled to normal

temperature, it restarts automatically.

TM00 2011 3793

Yellow and green

Blue

Brown

Black

English (GB)

6

6.5.1 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. Place the pump on a plane surface.

2. Start and stop the pump.

3. Observe the pump when started. If the pump

gives a slight clockwise jerk, see fig. 9, the

direction of rotation of the motor is correct. If the

jerk is counter-clockwise, interchange two

phases in the mains connection.

Fig. 9 Direction of rotation

If the pump is connected to a pipe system, check the

of direction of rotation in this way:

1. Start the pump and check the quantity of water.

2. Stop the pump and interchange two phases in the

mains connection.

3. Start the pump and check the quantity of water.

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.

7. Operation

7.1 Unilift KP-A

The pump will start and stop automatically,

depending on the liquid level and the cable length of

the float switch.

Forced operation

If the pump is used for draining liquid below the stop

level of the float switch, the float switch can be held

in a higher position by fastening it to the outlet pipe.

During forced operation, check the liquid level

regularly to avoid dry running.

7.2 Unilift KP-AV

The pump starts and stops automatically depending

on the liquid level.

7.3 Unilift KP-M

The pump is started and stopped via an external

switch.

To avoid dry running, check the liquid level regularly

during operation, for instance via external level

monitoring.

To enable the pump to self-prime during startup, the

liquid level must be at least 30 mm.

The pump can pump down to a liquid level of 15 mm.

TM03 4482 2206

A

R

56

DIN EN 12050-2

10m

IP68

Ins cl X

Hmax xx mP1 XXXX XXXX

Omax XX m /h

Tmax XX° C

U XXXXXXXXXX 50 Hz

XXXXX

Serial no XXXXXXXXXXXX

TYPE UNILIFT KP XXX

Made in XXXXXX

3

English (GB)

7

8. Maintenance

Under normal operating conditions, the pump is

maintenance-free.

If the pump has been used for liquids other than

clean water, flush it through with clean water

immediately after use.

8.1 Cleaning the pump

If the pump delivers too little water due to deposits or

the like, dismantle and clean the pump:

1. Disconnect the power supply.

2. Drain the pump.

3. Remove the inlet strainer.

– Press a screwdriver in between the pump

sleeve and the strainer and press hard. Do the

same in several places along the strainer until

it is pried loose and can be removed. See fig.

10.

Fig. 10 How to remove the inlet strainer

4. Clean the inlet strainer and fit it.

If the pump still delivers too little water, dismantle the

pump further.

1. Disconnect the power supply.

2. Remove the inlet strainer. See point 3 above.

3. Turn the pump housing 90 ° counter-clockwise

using a screwdriver. See the arrow on the pump

housing.

4. Pull off the pump housing. See fig. 11.

Fig. 11 How to remove the pump housing

5. Clean and flush the inside of the pump to remove

possible impurities between motor and pump

sleeve.

6. Clean the impeller. See fig. 12.

Fig. 12 How to flush the pump

7. Check that the impeller can rotate freely. If not,

remove the impeller. See point 6.

Warning

For safety reasons the inlet strainer must

always be fitted to the pump during

operation.

Never dismantle the pump unless the

power supply has been switched off.

Be careful during dismantling as you will

get access to sharp edges, etc., which

may cause cuts. Wear protective gloves.

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.

TM03 1167 1205

TM03 1168 1205TM03 1169 1205

Pump housing

English (GB)

8

8. Unscrew the nut (cross width 13 mm) from the

motor shaft. Use a screwdriver to prevent the

impeller from turning. See fig. 13.

Fig. 13 How to remove the impeller

9. Clean the impeller and clean around the shaft.

10. Check the impeller, the pump housing and the

sealing part. If necessary, replace defective

parts.

11. Assemble the pump in the reverse order of the

dismantling.

8.2 Service

The impeller, the inlet strainer and the non-return

valve are replaceable.

Order numbers for the ordering of service kits and

contents of service kits appear from the tables below

and fig. 14.

If other pump components are damaged or defective,

contact the pump supplier.

Fig. 14 Service parts

TM03 1170 1205

Caution

Before and during the mounting of the

pump housing, check that the sealing part

is fitted correctly. See fig. 14.

Moisten the sealing part with water to ease

the fitting.

Pump type Part number

Impeller kit

Unilift KP 150

Unilift KP 250

Unilift KP 350

015778

015779

015787

Inlet strainer

Unilift KP 150

Unilift KP 250 96548064

Unilift KP 350 96548066

Non-return valve

Unilift KP 150

Unilift KP 250

Unilift KP 350

15220

Service kits Pos. Designation Quantity

Impeller kit

A Impeller 1

BNut 1

C Sealing part 1

Inlet strainer D Inlet strainer 1

TM03 1166 1205

Note

The cable and level switch must be

replaced by an authorised Grundfos

service workshop.

D

C

B

A

English (GB)

9

9. Fault finding the product

10. 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.

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.

Unilift KP-A: Start the pump by lifting

the float switch. See section 7.1 Unilift

KP-A.

c) The fuses have blown. Replace the fuses.

d) The thermal switch has tripped. Wait until the thermal switch cuts in

again or let the pump cool off. See

section 6.5 Electrical connection.

2. The thermal switch

trips after a short time

of operation.

a) The liquid temperature is too high.

See section 5. Operating

conditions.

The pump starts automatically after

sufficient cooling.

b) The pump is partly blocked by

impurities.

Clean the pump. See section

8. Maintenance.

c) The pump is mechanically

blocked.

Remove the blockage. See section

8. Maintenance.

3. The pump runs but

delivers too little

water.

a) The pump is partly blocked by

impurities.

Clean the pump. See section

8. Maintenance.

b) The outlet pipe/hose is partly

blocked.

Check and clean the non-return valve,

if fitted.

c) Wrong direction of rotation in

three-phase pumps. See section

6.5.1 Checking the direction of

rotation.

Reverse the direction of rotation.

4. The pump runs but

delivers no water.

a) The pump is blocked by

impurities.

Clean the pump. See section

8. Maintenance.

b) The outlet pipe/hose is partly

blocked.

Check and clean the non-return valve,

if fitted.

c) The liquid level is too low. During

normal operation, the inlet strainer

must be covered by the pumped

liquid.

Lower the pump deeper into the liquid

or adjust the level switch.

d) Unilift KP-A: The free cable length

of the float switch is too long.

Reduce the free cable length. See

section 6.4 Start/stop level.

Appendix

10

Appendix 1

Dimensions

Unilift KP-AV Unilift KP-M

* Unilift KP 350

TM01 1523 4502

TM00 1642 1093

31

149

236

214

140215

Rp 1 1/4

148

30

220 (230*)

256 (266*)

148

30

140

Rp 1

220

226

14

226 (236*)

220 (230*)

1 1/4

Grundfos Unilift KP 250 User manual

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