Start-Up; Before Starting The Pump; Starting The Pump; Maintenance - Grundfos CRK Serie Instrucciones De Instalación Y Funcionamiento

8. Start-up

Warning
Pay attention to the direction of the vent
hole and take care to ensure that the
escaping water does not cause injury to
persons or damage to the motor or other
components.

8.1 Before starting the pump

• Make sure that all pipe connections are tight.
• Make sure that the pump is partly filled with liquid
(partly submerged).
• Make sure that the strainer is not blocked by
impurities.

8.2 Starting the pump

1. Close the isolating valve on the discharge side of
the pump.
2. If the pump is fitted with an air vent valve, this
valve must be opened. See fig. 13.
Fig. 13 Position of the air vent valve
3. See the correct direction of rotation of the pump
on the motor fan cover or on the coupling guard.
When seen from the top, the pump should rotate
counter-clockwise.
4. Start the pump and check the direction of
rotation.
5. Open the discharge pipe isolating valve a little.
6. If the pump is fitted with an air vent valve, this
valve must be closed when a steady flow of liquid
runs out of it.
7. Completely open the discharge pipe isolating
valve.
The pump has now been vented and is ready for
operation.
Do not run the pump against closed
discharge valve for more than approx. 5
minutes as this will cause an increase in
Caution
temperature/formation of steam in the
pump which may cause damage to the
pump.
12

9. Maintenance

Pump bearings and shaft seal are maintenance-free.
Motor bearings
Motors not fitted with grease nipples are
maintenance-free.
Motors fitted with grease nipples should be
lubricated with a high-temperature, lithium-based
grease. See the instructions on the fan cover.
In the case of seasonal operation (motor is idle for
more than 6 months of the year), we recommend to
grease the motor when the pump is taken out of
operation.
Depending on the ambient temperature, the motor
bearings must be replaced or lubricated according to
the table below. The table applies to 2-pole motors.
The number of operating hours stated for bearing
replacement are guidelines only.
Air vent valve
Intervals for 4-pole motors are twice as long as those
for 2-pole motors.
If the ambient temperature is lower than 40 °C,
bearings must be replaced/lubricated at the intervals
mentioned under 40 °C.
Warning
Before starting work on the pump, make
sure that all power supplies to the pump
have been switched off and that they
cannot be accidentally switched on.
Bearing replacement interval
Motor
[operating hours]
size
[kW]
40 °C 45 °C
0.37 - 0.75 18000 -
1.1 - 7.5 20000 15500 12500 10000
Lubrication interval
Motor
[operating hours]
size
[kW]
40 °C 45 °C
11 - 18.5 4500 3400
22 4000 3100
30-55 4000 3000
75 2000 1500
50 °C 55 °C 60 °C
- - -
7500
50 °C 55 °C 60 °C
2500 1700 1100
2300 1500 1000
2000 1500 -
1000 500 -