Startup; Non-Self-Priming Pumps; Self-Priming Pumps - Grundfos CM 1 Manual De Instrucciones

8. Startup

8.1 Non-self-priming pumps

Do not start the pump until it has been
Caution
filled with liquid.
8.1.1 Liquid filling
Warning
Pay attention to the direction of the
vent hole, and make sure that the
escaping hot or cold liquid does not
cause injury to persons or damage to
the equipment.
1. Close the isolating valve on the discharge side of
the pump.
2. Open the isolating valve in the suction pipe
completely before starting the pump.
3. Remove the filling plug. See fig. 8.
4. Fill the pump housing and the suction pipe
completely with liquid until a steady stream of
liquid runs out of the filling hole.
5. Fit and tighten the filling plug.
6. Start the pump and slowly open the discharge
isolating valve while the pump is running. This
ensures venting and pressure build-up during
start-up.
The discharge isolating valve must be
opened immediately after start-up of
the pump. Otherwise the temperature
Caution
of the pumped liquid may become too
high and cause damage to the
equipment.
Drain hole
Fig. 8 Position of filling hole and drain hole
If it is difficult for the pump to build up
Note
pressure, it may be necessary to repeat
steps 1 to 6.
14
Filling hole

8.2 Self-priming pumps

Do not start the pump until it has been
Caution
filled with liquid.
8.2.1 Liquid filling
Warning
Pay attention to the direction of the
vent hole, and make sure that the
escaping hot or cold liquid does not
cause injury to persons or damage to
the equipment.
1. Make sure that the discharge pipe is empty and
that the height from the centre of the suction port
to the first tapping point (H
requirements. See section 6.2.2 Pipe connection
(self-priming pumps).
2. Open the isolating valves in the suction and
discharge pipes.
3. Open a tap close to the pump so that air can
escape.
4. Remove the filling plug in the pump. See fig. 9.
5. If a filling plug has been installed in the discharge
pipe, remove this plug and use this hole for filling.
Otherwise use the filling hole in the pump.
6. Fill the pump housing and the suction pipe
completely with liquid until a steady stream of
liquid runs out of the filling hole.
7. Fit and tighten the filling plug(s).
8. Start the pump and wait until liquid is pumped.
If the filling hole in the pump has been used, it
may be necessary to repeat steps 1 to 8 to
ensure that the pump is completely filled with
liquid.
If connected to a frequency converter,
Note
the pump must run at maximum speed
-1
(3450 min ) during start-up.
9. If the pump does not operate properly after
several start-up attempts, see section 12. Fault
finding.
Filling hole
Fig. 9 Position of filling holes and drain hole
The pump is allowed to run for
5 minutes to attempt to suck liquid.
Note
If the pump does not build up pressure
and flow, repeat steps 1 to 8.
) meets the
1
Filling hole
Drain hole