Faults, Causes And Remedies - Wilo Rexa UNI Installation And Operating Instructions Manual

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 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 due to hot operating fluids!
Hot operating fluids can also spray out when the
pressure is escaping. This can result in scalding! To
avoid injuries, the following instructions must be
observed:
• Allow the pump to cool down to the ambient
temperature then open the screw plugs.
• Wear closed safety goggles or face protection
and gloves.
Fig. 11: 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).
Installation and operating instructions Wilo-Rexa UNI

Faults, causes and remedies

1
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
whistling is audible! Wait until the pressure has com-
pletely 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!
7. Pour in operating fluid: Rotate the pump until the
opening points upwards. Fill-in the operating fluid into
the opening.
⇒ Comply with the specifications for operating fluid
locations and quantity!
8. Clean the screw plug, replace the seal ring and screw it
back in. Max. tightening torque: 8 Nm!
10 Faults, causes and remedies
DANGER
Danger due to fluids hazardous to health!
Danger of death in case of pumps with fluids haz-
ardous to health! Wear the following protective
equipment while performing the work:
• Closed safety goggles
• Breathing mask
• Protective gloves
⇒ The equipment listed here is the minimum re-
quirement, observe the specifications of the
work regulations! The operator must make
sure that the personnel has received and read
the work regulations!
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work
can lead to death due to electric shock! Electrical
work must be carried out by a qualified electrician in
accordance with the locally applicable regulations.
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