Grundfos CRK Series, Installation And Operating Instructions Manual

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8. Start-up
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.
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.
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
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.
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Caution
Do not run the pump against closed
discharge valve for more than approx. 5
minutes as this will cause an increase in
temperature/formation of steam in the
pump which may cause damage to the
pump.
Air vent valve
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.
Motor
size
[kW]
Bearing replacement interval
[operating hours]
40 °C 45 °C 50 °C 55 °C 60 °C
0.37 - 0.75 18000 - - - -
1.1 - 7.5 20000 15500 12500 10000 7500
Motor
size
[kW]
Lubrication interval
[operating hours]
40 °C 45 °C 50 °C 55 °C 60 °C
11 - 18.5 4500 3400 2500 1700 1100
22 4000 3100 2300 1500 1000
30-55 4000 3000 2000 1500 -
75 2000 1500 1000 500 -