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7.3 Performing electrical maintenance
WARNING
Electric shock
Death or serious personal injury
‐
Switch off the power supply before you
start any work on the product.
‐
Make sure that the power supply
cannot be switched on accidentally.
‐
Lock the main switch in off position, or
unplug the power plug. Type and
requirements are specified in EN
60204-1, 5.3.
•
Check the gasket of the cabinet front cover and of
the cable entries.
•
Check the cable connections.
•
Check the controller functions.
•
Check and clean the level sensor.
•
If the controller is installed in a particularly moist
environment in a basement, we recommend
checking the terminals on the PCB in order to
identify possible corrosion. In typical installations,
the terminals will work for several years and do
not require any inspection.
•
Replace the 9 V battery, if fitted, in connection
with the annual service.
The above list is not complete. The
controller may be installed in environments
that require thorough and frequent
maintenance.
Related information
7.2.2 Cleaning the pressure tube and hose
7.3.1 Cleaning the level sensor
1. Switch off the power to the controller and the
pump(s).
2. Loosen the screw cap by turning it
counterclockwise. See the figure below.
3. Lift the sensor carefully out of the collecting tank.
Do not lift it by means of the hose.
4. Check for possible deposits on or in the pressure
tube.
5. Scrape off any deposits. If necessary, remove the
hose from the controller and flush the tube and
hose with clean water at low pressure. Make sure
no water remains in the hose.
6. Refit the pressure tube by screwing the screw cap
onto the tank. Reconnect the hose to the
controller. Check the sensor by test running the
lifting station.
Removing the level sensor
7.4 Contaminated lifting station or
components
WARNING
Biological hazard
Death or serious personal injury
‐
Flush the lifting station thoroughly with
clean water and drain the outlet pipes.
The product will be classified as contaminated if it has
been used for a liquid which is injurious to health or
toxic. If you request Grundfos to service the product,
contact Grundfos with details about the pumped liquid
before returning the product for service. Otherwise,
Grundfos can refuse to accept the product for service.
Clean the product in the best possible way before you
return it. Costs of returning the product are to be paid
by the customer. Any application for service must
include details about the pumped liquid.
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