Wilo Rexa UNI Series, Инструкция по установке и эксплуатации

Страница: 53 / 776

Maintenance and repair en
Installation and operating instructions Wilo-Rexa UNI 53
If damage is identified on the connection cable, decom-
mission 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.
9.5.3 Visual inspection of accessories
Accessories must be checked for:
▪ Correct fixation
▪ Smooth function
▪ Signs of wear, e.g. cracks caused by frequencies
Any defects detected must be repaired immediately or
the accessories must be replaced.
9.5.4 Visual inspection of the housing for wear
The housing parts are not allowed to have any apparent
damage. Contact customer service if defects are detec-
ted!
9.5.5 Function test of the monitoring device
To test resistances, the pump must be cooled down to
the ambient temperature!
9.5.5.1 Test the resistor of the temperature sensor
Measure the resistor of the temperature sensors with an
ohmmeter. The bimetallic strips must have a measured
value of 0 Ohm (passage).
9.5.6 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 inju-
ries, 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 pressure
is released. This can result in scalding! To avoid inju-
ries, 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.
1
Fig. 11: Sealing chamber: Oil change
1 Screw plug sealing chamber
‡
Protective equipment has been put on!
‡
Pump has been dismantled and cleaned (decontaminated
if required).
1. Position the pump horizontally on a firm surface. The
screw plug points upwards. WARNING! Risk of hands
being crushed. Ensure that the pump cannot fall over
or slip away!
2. Unscrew the screw plug slowly, but do not unscrew it
completely. WARNING! Overpressure in the motor!
Stop turning the screw plug further if hissing or whist-
ling is audible! Wait until the pressure has completely
dissipated.
3. After the pressure has dissipated, fully unscrew the
screw plug.
4. Place a suitable tank to collect the operating fluid.
5. Drain the operating fluid: Rotate the pump until the
opening points downwards.
6. Check the operating fluid: Notify customer service if an
operating fluid contains metal chips!