Maintenance; Frost Protection; Service; Service Kits And Manuals - Grundfos CRT Serie Montage- Und Betriebsanleitung

9. Maintenance

Warning
Before starting work on the pump, make sure that the
power supply has been switched off and that it
cannot be accidentally switched on.
Pump bearings and shaft seal are maintenance-free.
Motor bearings
Motors without grease nipples are maintenance-free.
Motors 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 six
months of the year), we recommend you 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 is a guideline only.
Bearing replacement interval [operating hours]
Motor size
[kW]
40 °C 45 °C
0.37 - 0.55 18,000 -
0.75 - 7.5 20,000 15,500
Lubrication interval [operating hours]
Motor size
[kW]
40 °C 45 °C
11 - 18.5 4,500 3,400
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.
12
50 °C 55 °C 60 °C
- - -
12,500 10,000 7,500
50 °C 55 °C 60 °C
2,500 1,700 1,100

10. 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 replace the drain plug until the
pump is to be used again.
CRT 2 and 4
Before replacing the drain plug in the base, screw the bypass
valve out against the stop. See fig. 19.
Fig. 19 Location of drain plug and bypass valve
Fit the drain plug by tightening the large union nut followed by the
bypass valve.
CRT 8 and 16
Fit the drain plug in the base.

11. Service

We recommend you to repair pumps with motors of 7.5 kW and
up at pump site. Necessary lifting equipment must be available.
If a pump has been used for a liquid which is toxic or
Note injurious to health, 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 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.

11.1 Service kits and manuals

See www.grundfos.com (WebCAPS), WinCAPS or Service Kit
Catalogue.
Drain plug
Bypass valve