7
5.4
Checking of liquid in motor
The level of the liquid in the motor should be checked before the pump is installed.
1. Place the pump and motor in a vertical position with the discharge port pointing
downwards (i.e. the bottom of the motor is uppermost), and remove the filling
screw. See fig. 4.
2. If the water stands up to the edge of the threaded hole, no filling is required.
If not, fill demineralised water into the motor.
To enable all air to escape, insert your finger in the pump discharge port and
lift the shaft a few times.
Recheck the liquid level.
3. Replace and tighten the filling screw.
The pump is now ready for installation.
5.5
Pipe connection
Pump discharge port: Rp 3/4.
A pipe or a hose can be connected to the pump.
Whenever a hose is fitted, a compression coupling must be used.
See fig. 5.
Tighten the union nut using fingers only and then give it 1 1/4 turns with a tool.
If PTFE pipes or hoses or unarmoured hoses are used, a stainless-steel straining
wire is required for lowering and lifting the pump.
Secure the straining wire to the pump with a wire holder. See fig. 6.
5.6
Lowering the pump
Lower the pump into the borehole, taking care not to damage the motor cable.
Do not lower or lift the pump by the motor cable.
5.7
Installation depth
During operation, the pump and motor must be completely submerged to
ensure the necessary lubrication of the shaft seal and cooling of the motor.
If the pump pumps more water that the borehole can yield, there is a risk that the water level falls below the
level of the pump inlet and that air is therefore sucked into the pump.
Long time of operation with water containing air may damage the pump and cause insufficient
cooling of the motor.
If a non-return valve is installed in the discharge pipe, it must be installed
at least 0.5 metres
above the
pump. This is necessary to ensure that the air in the pump is compressed so much that the pump contains
water when it is being submerged.
Fig. 4 Removal of filling screw
Fig. 5 Use of compression coupling
Fig. 6 Fitting the straining wire
