Checking Of Direction Of Rotation; Installation; Connection - Grundfos AP12 Installation And Operating Instructions Manual

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.

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.
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Fig. 2
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