Start-Up; Maintenance; Frost Protection; Service - Grundfos CR Serie Montage- Und Betriebsanleitung

7. Start-up

Note: Do not start the pump until it has been filled with liquid and
vented. If the pump runs dry, the pump bearings and the shaft
seal may be damaged.
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.
In hot-water installations, special attention should be
paid to the risk of injury caused by scalding hot water.
Follow the instructions on page 4.
CR, CRI, CRN 1s to 5:
For these pumps, it is advisable to open the bypass valve during
start-up. The bypass valve connects the suction and discharge
sides of the pump, thus making the filling procedure easier. When
the operation is stable, the bypass valve can be closed.
When pumping liquids containing air, it is advisable to leave the
bypass valve open if the operating pressure is lower than 6 bar.
If the operating pressure constantly exceeds 6 bar, the bypass
valve must be closed. Otherwise the material at the opening will
be worn because of the high liquid velocity.
Fig. 5

8. Maintenance

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.
Pump bearings and shaft seal are maintenance-free.
If the pump is to be drained for a long period of inactivity, remove
one of the coupling guards to inject a few drops of silicone oil on
the shaft between the pump head and the coupling. This will pre-
vent the shaft seal faces from sticking.
Motor bearings:
Motors which are 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), it is recommended to grease the motor
when the pump is taken out of operation.
Drain plug
Bypass valve

9. Frost protection

Pumps which are not being used during periods of frost should be
drained to avoid damage.
Drain the pump by loosening the vent screw in the pump head
and by removing the drain plug from the base.
Care must be taken to ensure that the escaping water
does not cause injury to persons or damage to the
motor or other components.
In hot-water installations, special attention should be
paid to the risk of injury caused by scalding hot water.
Do not tighten the vent screw and replace the drain plug until the
pump is to be used again.
CR, CRI, CRN 1s to 5:
Before replacing the drain plug in the base, screw the bypass
valve out against the stop, see fig. 5.
Fit the drain plug by tightening the large union nut followed by the
bypass valve.

10. Service

Note: If a pump has been used for a liquid which is injurious to
health or toxic, the pump will be classified as contaminated.
If Grundfos is requested to service the pump, Grundfos must be
contacted with details about the pumped liquid, etc. before the
pump is returned for service. Otherwise Grundfos can refuse to
accept the pump for service.
Possible costs of returning the pump are paid by the customer.
However, any application for service (no matter to whom it may
be made) must include details about the pumped liquid if the
pump has been used for liquids which are injurious to health or
toxic.

10.1 Service kits

Service kits for CR, CRI and CRN, see www.grundfos.com
(WebGOLD), WinCAPS or Service Kit Catalogue.
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