Preventative Maintenance; Frost Protection; Service; Service Kits And Service Documentation - Grundfos CR-H Série Manuel D'installation Et D'opération

11.4 Preventative maintenance

At regular intervals, depending on the conditions and time of
operation, the following checks should be made:
• Pump meets required performance and is operating smoothly
and quietly.
• There are no leaks, particularly at the shaft seal.
• The motor is not overloading.
• Remove and clean all strainers or filters in the system.
• Verify the tripping of the motor overload protection.
• Check the operation of all controllers. Check unit control
cycling twice and adjust, if necessary.
• If the pump is not operated for unusually long periods, the unit
should be maintained in accordance with these instructions.
In addition, if the pump is not drained, the pump shaft should
be manually rotated or run for short periods of time at monthly
intervals.
• To extend the pump life in severe duty applications, consider
performing one of the following actions:
– Drain the pump after each use.
– Flush the pump, through system, with water or other fluid
that is compatible with the pump materials and process
liquid.
– Disassemble the pump liquid components, and thoroughly
rinse or wash them with water or other fluid that is
compatible with the pump materials and process liquid.
If the pump fails to operate or there is a loss of performance, see
section 15. Troubleshooting.

12. 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.
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.
In hot-water installations, pay special attention to
the risk of injury caused by scalding hot water.
Do not tighten the vent screw and do not replace the drain plug
until the pump is to be used again.
Always replace the drain plug with the original or exact
replacement. Do not replace with a standard plug. Internal
recirculation will occur, reducing the output pressure and flow.

13. Service

If a pump has been used for a liquid which is
toxic or injurious to health, the pump will be
Note
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 to be 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 toxic or injurious to
health.
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13.1 Service kits and service documentation

Service kits, Service instructions and Service videos for CR-H
and CRN-H,
see www.grundfos.com (WebCAPS) or WinCAPS.