Start-Up And Operation; Start-Up; Operation; Minimum Flow Rate - Grundfos SP Serie Montage- Und Betriebsanleitung

For pumps fitted with plastic pipes, the
expansion of the pipes when loaded should be
Note
taken into consideration, when deciding on the
installation depth of the pump.

7. Start-up and operation

7.1 Start-up

When the pump has been connected correctly and it is
submerged in the liquid to be pumped, it should be started with
the discharge valve closed off to approx. 1/3 of its maximum
volume of water.
Check the direction of rotation as described in section
5.7.1 Checking of direction of rotation.
If there are impurities in the water, the valve should be opened
gradually as the water becomes clearer. The pump should not be
stopped until the water is completely clean, as otherwise the
pump parts and the non-return valve may choke up.
As the valve is being opened, the drawdown of the water level
should be checked to ensure that the pump always remains
submerged.
The dynamic water level should always be above the suction
interconnector of the pump, see section 4.2 Positional
requirements and fig. 22.
L3
L2
L1
Fig. 22 Comparison of various water levels
L1: Minimum installation depth below dynamic water level.
Minimum 1 metre is recommended.
L2: Depth to dynamic water level.
L3: Depth to static water level.
L4: Drawdown. This is the difference between the dynamic and
the static water levels.
L5: Installation depth.
If the pump can pump more than yielded by the well, it is
recommended to fit the Grundfos MP 204 motor protector, or
some other type of dry-running protection.
If no water level electrodes or level switches are installed, the
water level may be drawn down to the suction interconnector of
the pump and the pump will then draw in air.
Long time operation with water containing air
may damage the pump and cause insufficient
Caution
cooling of the motor.
16
L4
L5

7.2 Operation

7.2.1 Minimum flow rate

To ensure the necessary cooling of the motor, the pump should
never be set so low that the cooling requirements specified in
section 4.4 Liquid temperatures/cooling cannot be met.

7.2.2 Frequency of starts and stops

Motor type Number of starts
Minimum 1 per year is recommended.
MS 402 Maximum 100 per hour.
Maximum 300 per day.
Minimum 1 per year is recommended.
MS 4000 Maximum 100 per hour.
Maximum 300 per day.
Minimum 1 per year is recommended.
MS6 Maximum 30 per hour.
Maximum 300 per day.
Minimum 1 per year is recommended.
MS 6000 Maximum 30 per hour.
Maximum 300 per day.
Minimum 1 per year is recommended.
MMS 6000 Maximum 15 per hour.
Maximum 360 per day.
Minimum 1 per year is recommended.
MMS 8000 Maximum 10 per hour.
Maximum 240 per day.
Minimum 1 per year is recommended.
MMS 10000 Maximum 8 per hour.
Maximum 190 per day.
Minimum 1 per year is recommended.
MMS 12000 Maximum 5 per hour.
Maximum 120 per day.
Minimum 1 per year is recommended.
Franklin
Maximum 100 per day.

8. Maintenance and service

The pumps are maintenance-free.
All pumps are easy to service.
Service kits and service tools are available from Grundfos.
The pumps can be serviced at a Grundfos service centre.
Warning
If a pump has been used for a liquid which is
injurious to health or toxic, the pump will be
classified as contaminated.
If Grundfos is requested to service the pump, Grundfos must be
contacted with details about the pumped liquid, etc. before the
pump is returned for service. Otherwise Grundfos can refuse to
accept the pump for service.
Possible costs of returning the pump are paid by the customer.