Startup Instructions; Operating The Product; Operating Parameters - Grundfos CR Installation And Operating Instructions Manual

10.2 Startup instructions

1. Gradually open the isolating valve in the inlet line until a
steady stream of airless water runs out of the priming hole.
2. Close the plug and tighten securely.
3. Completely open the isolating valves.
®
For pumps with Cool-Top , see section
®
air-cooled top (Cool-Top ).
Follow these steps:
1. Switch off the power supply.
2. Check to make sure the pump has been filled and vented.
3. Remove the coupling guard and rotate the pump shaft by
hand to make sure it turns freely.
4. Verify that the electrical connections are in accordance with
the wiring diagram on the motor.
5. Switch on the power and observe the direction of rotation.
When viewed from above, the pump should rotate counter-
clockwise (clockwise for CRN-SF).
6. To reverse the direction of rotation, first switch off the power
supply.
7. On three-phase motors, interchange any two phases of the
power supply.
On single-phase motors, see wiring diagram on the
nameplate. Change wiring as required.
8. Switch on the power again and check for proper direction of
rotation. Once direction of rotation has been verified, switch
off the power again. Do not attempt to reinstall the coupling
guards while the motor is on. Replace the coupling guard if
the direction of rotation is correct. When the guards are in
place, the power can be switched on again.
Motors should not be run unloaded or uncoupled
from the pump at any time; damage to the motor
bearings will occur.
Do not start the pump before priming or venting the
pump. See fig. 15. Never let the pump run dry.
For CR, CRI, CRN 1s to 5 it is advisable to open the
bypass valve during start-up. See fig. 13. The bypass
valve connects the inlet and outlet sides of the pump,
thus making the filling procedure easier. Close the
bypass valve when operation is stable.
18. Startup of pump with

11. Operating the product

WARNING
Contamination when pumping drinking water
Death or serious personal injury
- Do not use the pump for drinking water if the
internal parts have been in contact with particles or
substances not suitable for water intended for
human consumption
WARNING
Airborne noise
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Too high pressure and leakage
Death or serious personal injury
- Do not run the pump against a closed outlet valve.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally come into
contact with hot or cold surfaces.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.

11.1 Operating parameters

CR multi-stage centrifugal pumps installed in accordance with
these instructions and sized for correct performance will operate
efficiently and provide years of service. The pumps are water-
lubricated and do not require any external lubrication or
inspection. The motors may require periodic lubrication as
described in section
14. Maintaining the
Under no circumstances should the pump be operated for any
prolonged periods of time without flow through the pump. This
can result in motor and pump damage due to overheating. A
properly sized relief valve should be installed to allow sufficient
liquid to circulate through the pump to provide adequate cooling
and lubrication of the pump bearings and seals.
motor.
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