46
WILO SE 10/2022 V05 DIN A4
English
MAINTENANCE AND REPAIR
Also note the maintenance intervals and maintenance
work for the motor. See the operating and maintenance
manual for the motor!
8.2.1. Intervals for normal operating conditions
2 years
• Visual inspection of the coating and housing for wear
• Functional check of pencil electrode (available as an
option) for sealing chamber monitoring
• Oil change in the sealing chamber
• Check the leakage chamber for leaks
NOTICE
If sealing chamber monitoring is installed, the
maintenance interval corresponds to the indica-
tor!
15,000 operating hours or after 10 years at the latest
• Complete overhaul
8.2.2. Intervals for harsh operating conditions
Under harsh operating conditions, the specified maintenance
intervals must be shortened accordingly. In this case, contact
Wilo customer service. When using the hydraulics under
harsh conditions, we also recommend signing a maintenance
contract.
Harsh operating conditions include:
•
A large proportion of fibrous material or sand in the fluid
• Strongly corrosive media
•
Strongly gassing fluids
• Unfavourable duty points
• Operation at risk from water hammers
8.2.3. Recommended maintenance measures to ensure
smooth operation
We recommend regular inspections of the current con-
sumption and the operating voltage in all phases. In normal
operation, these values remain constant. Slight fluctuations
depend on the characteristics of the fluid. Current con
-
sumption can provide an early indication of damage and/or
malfunctions in the impeller, bearings and/or motor, which
can be rectified. Larger voltage fluctuations strain the motor
winding and can cause the motor to break down. Regular
inspections can therefore largely prevent major secondary
damage and reduce the risk of total breakdown. We recom-
mend the use of remote monitoring for regular inspections.
Please contact Wilo customer service.
8.3.
Maintenance work
Before carrying out maintenance work:
• Disconnect the motor from the power and secure it
against being switched on inadvertently.
• Allow the hydraulics to cool down and clean them thor-
oughly.
• Make sure that all the operationally relevant parts are in
good condition.
8.3.1. Visual inspection of coating and housing for wear
The coatings and housing parts must not show any signs of
damage. If there is visible damage to the coatings, repair the
coating accordingly. If there is visible damage to the housing
parts, contact Wilo customer service.
8.3.2.
Functional check of pencil electrode (available as
an option) for sealing chamber monitoring
To check the pencil electrode, the hydraulics has to be cooled
to the ambient temperature and the electrical connection for
the pencil electrode has to be disconnected in the switch-
gear. The monitoring device can then be checked with an
ohmmeter. The following values should be measured:
•
This value must approach “infinity”. If the values are
low, there is water in the oil. Please also observe the
instructions of the optional evaluation relay.
If there are larger deviations, please consult Wilo customer
service!
8.3.3. Oil change in the sealing chamber
The sealing chamber has separate openings for draining and
filling the chamber.
WARNING! Risk of injury from hot and/or
pressurised operating fluid!
After the hydraulics are switched off, the oil
is still hot and pressurised. This can cause the
screw plug to be ejected and hot oil to escape.
There is a risk of injury or burns! First allow
the oil to cool down to ambient temperature.
NOTICE
For vertical installation, the unit must first be
brought into a horizontal position!
Fig. 4.: Screw plugs
D- Drain hole screw plug
D+ Filler hole screw plug
1. If you can place a tank beneath the hydraulics to collect
the operating fluids, you do not need to remove the
hydraulics.
2. Carefully and slowly unscrew the screw plug (D+).
Caution: The operating fluid may be pressurised! This can
cause the screw to be ejected at speed.
3. Place a suitable tank beneath the screw plug (D-) to
collect the operating fluid.
4. Carefully and slowly unscrew the screw plug (D-) and
allow the operating fluid to drain out. Dispose of the
operating fluid in accordance with the requirements in
the “Disposal” section.
5. Clean the screw plug (D-), renew the seal ring and screw
it back in.
6.
Pour the new operating fluid in through the hole for the
screw plug (D+). Note the recommended operating fluids
and filling quantities!
7. Clean the screw plug (D+), renew the seal ring and screw
it back in.
8.3.4. Check the leakage chamber for leaks
The leakage chamber is a self-contained chamber and
receives the leakage from the sealing chamber in the event
of faults. If there are large quantities of water in the leakage
chamber, please contact Wilo customer service.
