Stationary Wet Well Installation - Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento

US English
is to be installed outside potentially explosive areas
in such a way that it is protected from submersion.
• When used in an explosive atmosphere, it must
be ensured that the pump and all accessories are
approved for this purpose.
• Structural components and foundations must be of
sufficient stability in order to allow the product to
be fixed securely and functionally. The end user or
the supplier is responsible for the provision of the
foundations and their suitability in terms of dimen-
sions, stability, and strength.
• If the motor housing is to be taken out of the fluid
during operation, the operating mode for non-im-
mersed operation should be applied.
To keep glanded motors sufficiently cooled in S3
mode, they must be flooded completely before
being switched back on if the motor has been
taken out of the fluid!
• Never let the pump run dry. The water level must
never fall below the minimum. Therefore, we
recommend installing a level control system or a
dry-running protection system where there are
great variations in the level.
• Use guide and deflector plates for the fluid intake.
If the water jet reaches the surface of the water, air
will be introduced into the fluid, which can accumu-
late in the pipe system. This can result in inadmissi-
ble operating conditions and to deactivation of the
entire system.
• Check that the available planning documentation
(installation plans, layout of the operating space,
intake ratios) is complete and correct.
• Also observe all regulations, rules, and legal require-
ments for working with and underneath heavy sus-
pended loads. Wear appropriate protective clothing/
equipment.
• Please also observe the applicable national accident
prevention regulations and trade association safety
provisions.
5.3.1. Maintenance work
After a storage period of more than 6 months, the
following maintenance work must be carried out
before installation:
• Rotate impeller
• Check oil level in the sealing chamber
Rotate impeller
1. Position the pump horizontally on a firm surface.
Make sure that the pump cannot fall over and/or
slip.
2. Carefully and slowly reach into the hydraulics hous-
ing from below and rotate the impeller.
16
WARNING: sharp edges!
Sharp edges can form on the impellers and
hydraulic opening. There is a risk of injury! Wear
the necessary protective clothing, such as pro-
tective gloves.
Check oil level in sealing chamber
The sealing chamber has a hole for draining and
filling the chamber.
1. Position the pump horizontally on a firm surface
with the screw plug facing upward.
Make sure that the pump cannot fall over and/or
slip.
2. Unscrew the screw plug (see Fig. 8).
3. The oil should reach up to about 0.4 in (1 cm) below
the hole for the screw plug.
4. If there is not enough oil in the sealing chamber, top
it up. To do so, follow the instructions under "Oil
change" in the "Maintenance and repair" section.
5. Clean the screw plug, replace the joint ring if neces-
sary, and screw it back in.

5.3.2. Stationary wet well installation

A guide system must be installed for wet well instal-
lation. This must be ordered from the manufacturer
separately. The pipe system on the pressure side is
connected to this.
The connected pipe system must be self-sup-
porting, i.e. it must not be supported by the guide
system.
The operating space must be laid out so that the
guide system can be installed and operated without
difficulty.
If the motor emerges from immersion during oper-
ation, the following operating parameters must be
strictly observed:
• The max. fluid temperature and ambient tempera-
ture is 104 °F (40 °C).
• Specifications for "non-immersed operating mode"
Fig. 2.: Wet well installation
1 Guide system
2 Non-return valve
3 Gate valve
4 Pipe elbow
Guide pipe
5 (to be provided by the
customer)
A Minimum distances in parallel operation
B Minimum distances in alternating operation
INSTALLATION
6 Lifting gear
Min. water level for im-
7a
mersed operation
Min. water level for
7b non-immersed opera-
tion*
8 Impact protection plate
9 Inlet
WILO SE 2014-11 V05 Letter