Wilo Rexa UNI Series, Installation And Operating Instructions Manual

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en Application/use
36 WILO SE 2019-02
▪ Ensure minimum water submersion through dry-running
protection.
▪ Under normal operating conditions, the sound pressure
level of the device is below 85 dB(A). However, the actual
sound-pressure level depends on several factors:
– Installation depth
– Installation
– Fixation of accessories and pipe
– Duty point
– Immersion depth
▪ If the device is operated under normal operating condi-
tions, the operator must measure the sound pressure. Ear
protection must be worn for sound pressure levels of
85 dB(A) and above and this must be noted in the work
regulations!
2.9 Maintenance tasks
▪ Wear the following protective equipment:
– Closed safety goggles
– Safety shoes
– Safety gloves for protection against cuts
▪ Always carry out maintenance tasks outside the operat-
ing space/installation site.
▪ Only carry out maintenance tasks mentioned in these in-
stallation and operating instructions.
▪ Only original parts from the manufacturer may be used
for maintenance and repairs. Use of parts other than the
original parts releases the manufacturer from any liabil-
ity.
▪ Collect any leakage of fluid and operating fluid immedi-
ately and dispose of it according to the locally applicable
guidelines.
▪ Store tools at the designated locations.
▪ After completing work, reattach all safety and monitor-
ing devices and check that they function properly.
Changing operating fluid
In case of a defect, 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
caution, 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 unscrew them
completely. As soon as the pressure escapes (audible
whistling or hissing of air), stop turning the screw plug
any further.
WARNING! Hot operating fluids can also spray out
when the pressure is escaping. This can result in scald-
ing! To avoid injuries, allow the motor to cool down to
the ambient temperature before carrying out any
work!
▪ When the pressure has completely dissipated, fully un-
screw the screw plug.
2.10 Operating fluid
In the sealing chamber, the motor is filled with white oil.
Operating fluid must be replaced during regular main-
tenance work and disposed off according to the local
guidelines.
2.11 Operator responsibilities
▪ Installation and operating instructions must be in a lan-
guage which the personnel can understand.
▪ Make sure that the personnel is relevantly trained for the
specified work.
▪ Provide the necessary protective equipment and make
sure that the personnel wears it.
▪ Safety and information signs mounted on the device
must be always legible.
▪ Train the personnel pertaining to the functioning of the
system.
▪ Eliminate risk from electrical current.
▪ Equip hazardous components inside the system with an
on-site guard.
▪ Identify and cordon off the work area.
▪ To ensure safe working practice, define the responsibilit-
ies of the employees.
Children and persons younger than 16 years or with re-
duced physical, sensory or mental capacities or limited
experience are prohibited from handling the product! A
technician must supervise persons younger than
18 years!
3 Application/use
3.1 Intended use
The submersible pumps are suitable for pumping:
▪ Sewage containing faeces
▪ Wastewater (with small amounts of sand and gravel)
▪ Fluids with up to max. 8 % dry matter
▪ Fluids with a pH value of > 4.5
The submersible pumps in material version “B” are addi-
tionally suitable for pumping:
▪ Lake- and seawater with a temperature of max. 20 °C
▪ Swimming pool water with a chloride content of max.
400 mg/l
▪ Aggressive fluids (condensate, distilled water) with a
pH value of > 3.5