Starting Up The Product; Liquid Filling - Grundfos CM-L Instrucciones De Instalación Y Funcionamiento

4. Starting up the product

Do not start the pump until it has been
filled with liquid. See section
filling.
Do not start the pump until you have filled the system
with liquid and vented it. Furthermore, the required
minimum inlet pressure must be available at the
pump inlet. See section 10.4 Minimum inlet
pressure.
CAUTION
Pressurised system
Minor or moderate personal injury
- If the inspection screw is to be
loosened, make sure that the escaping,
scalding hot liquid does not cause
personal injury or damage to
components.
Fig. 7 Loosening the inspection screw

4.1 Liquid filling

CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
- Pay attention to the direction of the vent
hole when you fill the pump with liquid
and vent it.
- Make sure that no persons are hurt by
the escaping liquid.
Pay attention to the direction of the vent
hole when you fill the pump with liquid and
vent it. Make sure that the escaping liquid
does not cause damage to the motor or
other components.
8
4.1 Liquid
Inspection screw
1. Close the isolating valve on the outlet side of the
pump.
2. Open the isolating valve in the inlet pipe
completely before starting the pump.
3. Remove the filling plug. See fig. 8.
4. Fill the pump housing and the inlet 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 outlet
isolating valve while the pump is running. This
ensures venting and pressure buildup during
startup.
The outlet isolating valve must be opened
immediately after startup of the pump.
Otherwise the temperature of the pumped
liquid may become too high and cause
damage to the equipment.
Fig. 8 Position of filling hole and drain hole
If it is difficult for the pump to build up
pressure, it may be necessary to repeat
steps 1 to 6.
Filling hole
Drain hole