Electrical Connection; Operation And Maintenance; Lubrication And Maintenance; Filters - Grundfos CRK 2 Serie Instrucciones De Instalación Y Funcionamiento

5. Electrical connection

The electrical connection should be carried out in ac-
cordance with local regulations.
Never make any connections in the pump
terminal box unless the electricity supply
has been switched off.
If the pump is not connected to an electric
installation, it must be connected to an ex-
ternal mains switch.
The operating voltage and frequency are marked on
the pump nameplate. Please make sure that the mo-
tor is suitable for the electricity supply on which it will
be used.
Single-phase GRUNDFOS motors incorporate a
thermal overload switch and require no additional
motor protection.
Three-phase motors must be connected to a motor
starter.
The terminal box can be turned to four positions, in
90° steps. See fig. 6.
Proceed as follows:
1. Remove the coupling guards (CRK, SPK and
MTR). Do not remove the coupling.
2. Remove the four bolts securing the motor to the
motor stool.
3. Turn the motor to the required position.
4. Replace and tighten the four bolts.
5. Replace the coupling guards.
The electric motor should be connected to the supply
as shown in the diagram inside the terminal box
cover.
Fig. 6
0˚
270˚
180˚
6. Start-up
Pay attention to the direction of the vent
hole and take care to ensure that the esca-
ping water does not cause injury to per-
sons or damage to the motor or other
components.
Before starting the pump, make sure:
• that all pipe connections are tight.
• that the pump body is partly filled with liquid
(partly submerged).
• that the strainer is not blocked by impurities.
6
Start the pump as follows:
1. Close the isolating valve on the discharge side of
the pump.
2. If the pump is fitted with a vent valve, this valve
must be opened, see fig. 7.
Fig. 7
3. See the correct direction of rotation of the pump
on the motor fan cover. When seen from the top,
the pump should rotate counter-clockwise.
4. Start the pump and check the direction of rota-
tion.
5. Open the discharge isolating valve a little.
6. If the pump is fitted with a vent valve, this valve
must be closed when a steady stream of liquid
runs out of it.
7. Completely open the discharge isolating valve.
The pump has now been vented and is ready for op-
eration.

6. Operation and maintenance

Note: The pump is not allowed to run against a
closed discharge valve for more than approx. 5 min-
utes as this will cause an increase in temperature/
formation of steam in the pump which may cause
damage to the pump.
90˚

6.1 Lubrication and maintenance

Pumps installed in accordance with these instruc-
tions require very little maintenance.
The mechanical shaft seal is self-adjusting and has
wear-resistant seal rings which are lubricated and
cooled by the pumped liquid.
The pump bearings are also lubricated by the
pumped liquid. The motor ball bearings are grease
packed and sealed for life. No further lubrication is
necessary.
Pumps from 4 kW and up have angular contact bear-
ings.

6.2 Filters

Chip trays, filters, etc. should be cleaned at regular
intervals to ensure a correct flow of liquid.
Vent valve
Vent valve