en Maintenance and repair
22 WILO SE 2019-02
WARNING
Hand, foot or eye injuries due to the absence
of protective equipment!
Danger of (serious) injuries during work. Wear the
following protective equipment:
• Safety gloves for protection against cuts
• Safety shoes
• Closed safety goggles
The following pre-requisites must be fulfilled prior to starting
maintenance measures:
ƒ Pump cooled down to the ambient temperature.
ƒ Pump cleaned thoroughly and disinfected (if required).
9.5.1 Visual inspection of the connection cable
Check connection cable for:
ƒ Bubbles
ƒ Cracks
ƒ Scratches
ƒ Abrasion
ƒ Pinch points
If damage is identified on the connection cable, decommission
the pump immediately! Have the connection cable replaced by
Wilo customer service. Only operate the pump up again once the
damage has been properly remedied!
CAUTION!Water may penetrate into the pump due to the
damaged connection cable! Water ingress leads to total failure
of the pump.
9.5.2 Visual inspection of accessories
Accessories must be checked for:
ƒ Correct fixation
ƒ Smooth function
ƒ Signs of wear, e.g. cracks caused by frequencies
Any defects detected must be repaired immediately or the ac-
cessories must be replaced.
9.5.3 Visual inspection of the housing for wear
The housing parts are not allowed to have any apparent damage.
Contact customer service if defects are detected!
9.5.4 Function test of the monitoring device
To test resistances, the pump must be cooled down to the ambi-
ent temperature!
9.5.4.1 Test the resistor of the temperature sensor
Measure the resistor of the temperature sensors with an ohm-
meter. The bimetallic strips must have a measured value of
0Ohm (passage).
9.5.5 Oil change in sealing chamber
WARNING
Operating fluid under high pressure!
A pressure of several bar can build up in the motor!
This pressure escapes when the screw plugs are
opened. If screw plugs are opened without due cau-
tion, they can be ejected at high speed! To avoid in-
juries, observe the following instructions:
• Adhere to the prescribed sequence of work
steps.
• Unscrew the screw plugs slowly, but never un-
screw them completely. As soon as the pressure
escapes (audible whistling or hissing of air), stop
turning the screw plug any further!
• When the pressure has completely dissipated,
fully unscrew the screw plugs.
• Wear closed safety goggles.
WARNING
Scalding from hot operating fluids!
Hot operating fluids can also spray out when pres-
sure is released. This can result in scalding! To avoid
injuries, the following instructions must be observed:
• Allow the motor to cool down to the ambient
temperature before opening the screw plugs.
• Wear closed safety goggles or face protection
and gloves.
Fig.8: Sealing chamber: Oil change
1 Screw plug sealing chamber
‡ Protective equipment has been put on!
‡ Pump has been dismantled and cleaned (decontamin-
ated if required).
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