Checking Of Direction Of Rotation; Installation; Connection - Grundfos Unilift AP12 Instrucciones De Instalación Y Funcionamiento

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Warning

As a precaution, the pump must be

connected to a socket with earth

connection. The permanent installation

must be fitted with an earth leakage

circuit breaker (ELCB) with a tripping

current < 30 mA.

Three-phase pumps must be connected to an

external motor starter with differential release and

with a minimum contact gap of 3 mm. The set

nominal current of the motor starter must correspond

to the electrical data marked on the pump

nameplate.

If a level switch is connected to a three-phase pump,

the motor starter must be magnetically operated.

Single-phase pumps incorporate thermal overload

protection and require no additional motor

protection.

Warning

If the motor is overloaded, it will stop

automatically. When it has cooled to

normal temperature, it will restart

automatically.

4.1 Checking of direction of rotation

(Three-phase pumps only)

The direction of rotation should be checked every

time the pump is connected to a new installation.

Check the direction of rotation as follows:

1. Position the pump so that the impeller can be

observed.

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 suction strainer (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 piping system, the

direction of rotation can be checked as follows:

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

the discharge 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 discharge pressure.

4. Stop the pump.

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.

5. Installation

Warning

The installation of the pump must be

carried out by specially trained

persons.

Unilift AP35 and AP50: Care must be

taken to ensure that persons cannot

come into contact with the pump

impeller.

According to EN 60335-2-41/A2:2010,

this product with 5 metres of mains

Note

cable may be used only for indoor

applications.

5.1 Connection

For permanent installation, it is recommended to fit a

union, a non-return valve and an isolating valve in

the discharge pipe.

If the pump is installed in a pit with a minimum free

cable length of 100 mm, see fig. 6, the minimum pit

dimensions must be as shown in fig. 2.

Furthermore, the pit should be dimensioned

according to the relation between the water flow to

the pit and the pump capacity.

‹

550 mm

Fig. 2

‹

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Este manual también es adecuado para:

Unilift ap35 Unilift ap50

Checking Of Direction Of Rotation; Installation; Connection - Grundfos Unilift AP12 Instrucciones De Instalación Y Funcionamiento

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4.1 Checking of direction of rotation

5. Installation

5.1 Connection

Capítulos

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