Start-Up (Air-Cooled Top) - Grundfos CR-H Serie Instrucciones De Instalación Y Funcionamiento

14. Start-up (air-cooled top)

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, special attention should be paid to the risk of injury caused by scalding hot liquid.
It is recommended to connect a drain pipe to the 1/2" air vent in order to lead the hot water/steam to a safe place.
Step
1
Closed
Open
2
Closed
1
Open
3
Open
Open
4
Action
Close the isolation valve on the discharge side, and open the
isolation valve on the suction side of the pump.
Note: The air-cooled top should only be started up with cold liquid.
Remove the air vent pipe (2) from the air-cooled chamber (1) by
2
loosening the lock nut and unscrewing the pipe. Slowly fill the
chamber with liquid.
When the chamber is completely filled with liquid, replace the air
vent pipe, and tighten the lock nut securely.
It may be necessary to apply new PTFE tape to the pipe threads
and pipe dope to the chamber threads to seal.
Open the isolation valve on the discharge side of the pump.
Start the pump, and check the direction of rotation.
See the correct direction of rotation of the pump 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: During start-up of a cold pump with hot liquid, it is normal
that a few drops of liquid are leaking from the sleeve.
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