Start-Up; Adjustment Of Float Switch; Operation; Periods Of Inactivity - Grundfos SPO Series Installation And Operating Instructions Manual

1. Start the pump and measure the quantity of wa-
ter.
2. Stop the pump, switch off the electricity supply
and interchange any two of the incoming supply
wires.
3. Restart the pump and measure the quantity of
water.
4. Stop the pump.
5. Compare the results taken under points 1 and 3.
The connection which gave the larger quantity of
water is the correct direction of rotation.

7. Start-up

• The SPO pump with base plate must be primed
before starting.
Remove the priming plug at the top of the pump
and prime the pump.
Make sure that both the pump and the suction
pipe are filled with liquid.
• Switch on the electricity supply and wait until the
liquid starts running out of the discharge pipe.
• If the pump does not operate satisfactorily, switch
off the electricity supply and see section 10. Fault
finding chart.

7.1 Adjustment of float switch

The pump stop level is set by changing the free ca-
ble length between the float switch and the fixing
point (clamp on the pump handle), see fig. 7, pos. B.
It must be ensured,
• that the float switch can move freely.
• that the stop level does not fall below the pump
suction strainer.
Fig. 7
Min.
150 mm

8. Operation

Note: During operation, the pump suction strainer
must always be completely submerged in the liquid
to be pumped.
If the pump has been used for liquids other than
clean water, it should be flushed through with clean
water immediately after use.

8.1 Periods of inactivity

If the pump is taken out of operation for a long pe-
riod, it should be drained.
Pumps with base plate can be drained via the drain
plug.

8.2 Frequency of starts and stops

Maximum 30 per hour.

9. Maintenance and cleaning

During normal operation, the pump is maintenance-
free.

9.1 Cleaning the pump suction strainer

To clean the suction strainer, proceed as follows:
1. Place the pump in horizontal position.
2. Remove the suction strainer cover by slackening
3. Clean the inside of the suction strainer.
4. Check that the slots of the suction strainer are
5. Refit the suction strainer cover and reinstall the

9.2 Checking the motor shaft

If the motor does not operate and the shaft does not
rotate when the electricity supply is switched on or
the float is activated, it must be checked whether all
rotating parts can rotate freely.
Proceed as follows:
1. Place the pump in horizontal position.
2. Remove the suction strainer cover by slackening
3. Slacken the self-locking nut and turn the motor
4. Refit the suction strainer cover and reinstall the
B
Before starting work on the pump/motor,
make sure that the electricity supply has
been switched off and that it cannot be ac-
cidentally switched on.
the three screws with a screwdriver.
free from foreign bodies.
pump.
the three screws with a screwdriver.
shaft clockwise.
pump.
9