Startup - Grundfos CR 1s Manual Del Usuario

9. Startup

Do not start the pump until it has been filled with liquid and vented.
Note
Warning
Pay attention to the direction of the vent hole, and take care to ensure that the escaping liquid does not cause injury
to persons or damage to the motor or other components.
In hot-liquid installations, pay special attention to the risk of personal injury caused by scalding hot liquid.
It is advisable to connect a drain pipe to the air vent (1/2") in order to lead the hot water/steam to a safe place.
Step
1
Open
2
3
4
Open
5
8
Closed
Open
Action
Close the isolating valve on the discharge side, and open the
isolating valve on the inlet side.
Note: At startup, the temperature of the pumped liquid should be
lower than the ambient temperature.
Remove the priming plug from the pump head (1), and slowly fill
the pump with liquid.
When the pump is completely filled with liquid, replace the priming
plug and tighten securely.
Remove the priming plug from the air-cooled chamber (2), and
slowly fill the chamber with liquid.
When the chamber is completely filled with liquid, replace the
priming plug and tighten securely.
Open the isolating valve on the discharge side.
Start the pump, and check the direction of rotation.
See the correct direction of rotation on the motor fan cover.
If the direction of rotation is wrong, interchange any two of the
incoming supply wires.
After 3 to 5 minutes, the air vent has been filled with liquid.
Note: The sleeve may leak a little at startup if the temperature of
pumped liquid is much higher than that of the liquid in the air-
cooled top.