Grundfos SE1 50 Instrucciones De Instalación Y Funcionamiento página 22

9. Start-up
Warning
Before starting work on the pump, make sure that the
fuses have been removed or the mains switch has
been switched off. It must be ensured that the power
supply cannot be accidentally switched on.
Make sure that all protective equipment has been
connected correctly.
The pump must not run dry.
Warning
The pump must not be started if the atmosphere in
the pit is potentially explosive.
Warning
It may lead to personal injuries or death to open the
clamp while the pump is operating.
9.1 SE1
1. Remove the fuses and check that the impeller can rotate
freely. Turn the impeller by hand.
Warning
The impeller can have sharp edges - wear protective
gloves.
2. Check the condition of the oil in the oil chamber. See also
section 10.2.1 Oil change.
3. Check that the system, bolts, gaskets, pipework and valves
etc. are in correct condition.
4. Mount the pump in the system.
5. Switch on the power supply.
6. Check whether the monitoring units, if used, are operating
satisfactorily.
7. For pumps with sensor, switch on the IO 111 and check that
there are no alarms or Warnings. See section
8. Check the setting of air bells, float switches or electrodes.
9. Check the direction of rotation. See section
rotation.
10. Open the isolating valves, if fitted.
11. Check that the liquid level is above the upper edge of the
clamp on the pump. If the level is below the clamp, add liquid
to the pit until the minimum level is obtained.
12. Remove trapped air from the pump housing by tilting the
pump with the lifting chain.
13. Start the pump and let the pump run briefly, and check if the
liquid level is falling. A correctly vented pump will quickly
lower the liquid level.
Trapped air can be removed from the pump housing
by tilting the pump by means of the lifting chain when
Note
the pump is in operation.
In case of abnormal noise or vibrations from the
pump, other pump failure or power supply failure or
Caution
water supply failure, stop the pump immediately. Do
not attempt to restart the pump until the cause of the
fault has been found and the fault corrected.
After one week of operation or after replacement of the shaft seal,
check the condition of the oil in the chamber. For pumps without
sensor, this is done by taking a sample of the oil. See section
10. Maintenance and service for procedure.
22
9.2 SEV
1. Remove the pump from the system.
2. Check that the impeller can rotate freely. Turn the impeller by
hand.
3. Check the condition of the oil in the oil chamber. See also
section
4. Check whether the monitoring units, if used, are operating
satisfactorily.
5. Check the setting of the air bells, float switches or electrodes.
6. Check the direction of rotation. See section
rotation.
7. Submerged pumps:
Start the pump above water level and lower the pump into the
pit to avoid air being trapped in the pump housing.
8. Dry-installed pumps with positive inlet pressure (if the
pump is installed in a pump room next to the pit):
• Open the isolating valve on the suction side.
• Loosen the vent screw until water comes out of the vent hole;
then tighten the vent screw again.
• Open the isolating valve on the discharge side and start the
pump.
9. Dry-installed pumps with inlet pipe and foot valve:
• Open the isolating valve on the discharge side to let the water
above the valve run backwards to prime the inlet pipe.
• Loosen the vent screw until water comes out of the vent hole;
then tighten the vent screw again.
• Start the pump.
10. Dry-installed pumps with inlet pipe and foot valve,
without or with short discharge pipe (we recommend the
use of a vacuum system):
• Keep the isolating valve on the discharge side closed.
8.7 IO 111.
• Start the vacuum system until liquid has been sucked in and
the pump has been vented.
9.3 Direction of
• Open the isolating valve on the discharge side and start the
pump.
Fig. 16 Position of the air vent screw
Warning
The impeller can have sharp edges - wear protective
gloves.
10.2.1 Oil change.
Air vent screw
9.3 Direction of