Wilo Rexa CUT GI Instrucciones De Instalación Y Funcionamiento página 31

9.5.2 Visual inspection of the connec-
tion cable
9.5.3 Visual inspection of accessories
9.5.4 Visual inspection of coatings and
housing for wear
9.5.5 Function test of the monitoring
devices
9.5.5.1 Checking resistor in the tempera-
ture sensor
9.5.5.2 Testing the resistor of the exter-
nal electrode for sealing chamber
control
9.5.6 Oil change in sealing chamber
Installation and operating instructions Wilo-Rexa CUT GI
Maintenance and repair
Check the connection cable for:
▪ Bubbles
▪ Cracks
▪ Scratches
▪ Abrasion
▪ Pinch points
If damage is identified on the connection cable, decommission the pump immediately! Have
the connection cable replaced by Wilo customer service. Only start the pump up again once
the damage has been properly remedied!
CAUTION! Due to damaged connection cables, water can penetrate into the pump! Water
ingress causes total breakdown of the pump.
The accessories must be checked for:
▪ Correct attachment
▪ Proper function
▪ Signs of wear, e.g. cracks caused by vibrations
Any detected defects must be repaired immediately or the accessories must be replaced.
The coatings and housing parts must not show any signs of damage. If deficiencies are iden-
tified, the following points must be observed:
▪ If the coating is damaged, the coating must be repaired.
▪ Contact customer service if housing components are worn!
To check the resistors, the pump must be cooled down to ambient temperature!
Check the resistor in the temperature sensor with an ohmmeter. The bimetallic strip must
have a measured value of 0 ohm (conductivity).
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, there is water in the oil – change the oil!
WARNING
Operating fluid under high pressure!
A pressure of several bar can build up inside the motor! This pressure escapes when
opening the screw plugs. Screw plugs opened carelessly can be ejected at high speed! To
avoid injuries, observe the following instructions:
• Adhere to the prescribed sequence of work steps.
• Unscrew screw plugs slowly but never fully. As soon as the pressure escapes (audible
whistling or hissing of air), do not turn any further!
• When the pressure has fully dissipated, fully unscrew screw plugs.
• Wear closed safety goggles.
WARNING
Scalding due to hot operating fluids!
When the pressure escapes, hot operating fluid can also be ejected. This can result in
scalding! To avoid injuries, the following instructions must be observed:
• Allow the mixer to cool to ambient temperature, then open the screw plugs.
• Wear closed safety goggles or face protection as well as gloves.
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