Wilo Rexa CUT, Installation And Operating Instructions Manual

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44 WILO SE 11-2014 V05 DIN A4
English INSTALLATION
Fig. 2.: Wet well installation
1 Suspension unit 6a Min. water level for
immersed operation
2 Non-return valve 6b
Min. water level for
non-immersed oper-
ation
3 Gate valve 7 Impact protection plate
4 Pipe elbow 8 Inlet
5 Guide pipe (to be provided by the customer!)
A Minimum distances in parallel operation
W Minimum distances in alternating operation
Work steps
1. Installation of the suspension unit: about 3-6 h
(please see the operating manual for the suspen-
sion unit).
2. Preparing the pump for operation on a suspension
unit: about 1-3 h
(please see the operating manual for the suspen-
sion unit).
3. Installing the pump: about 3-5 h
• Check that the suspension unit is firmly fixed
and functions properly.
• Secure the lifting equipment to the pump with
the shackle, lift the pump and then lower slowly
on to the guide pipes in the operating space.
• Hold the power supply cables slightly taut
when lowering.
• When the pump is connected to the suspension
unit, make sure that the power supply cables
are secured adequately against falling off and
damage.
• Have the electrical connections made by a
qualified electrician.
• The pressure connection is sealed by its own
weight.
4. Installing optional accessories, such as dry-run -
ning protection or level controls.
5. Commissioning the pump: about 2-4 h
• As described in the “Commissioning” section
• For new installation: Flood the operating space
• Vent the pressure pipe.
5.3.3. Portable wet well installation
In this installation type, the pump has to be
equipped with a pump foot (available as an op-
tion). This is attached to the suction port and en -
sures the minimum ground clearance and a secure
footing if placed on a solid bearing surface. In this
version, the pump can be positioned anywhere in
the operating space. If used in an operating space
with a soft bearing surface, a hard base must be
used to prevent sinking. A pressure hose is con-
nected on the pressure side.
If operated for longer periods of time in this in-
stallation type, the pump must be fastened to the
floor. This prevents vibration and ensures quiet
and low-wearing running.
If the motor emerges during operation, the
following operating parameters must be strictly
observed:
• The max. fluid temperature and ambient tem -
perature is 40 °C .
• Details for "Non-immersed operating mode"
Fig. 3.: Portable installation
1 Lifting gear 5 Storz hose coupling
2 Pump foot 6 Pressure hose
3
Pipe elbow for hose
connection or Storz
pipe coupling
7a Min. water level for im-
mersed operation
4 Storz pipe coupling 7b Min. water level for
non-immersed operation
Work steps
1. Preparing pumps: about 1 h
• Install the pump foot on the suction connec-
tion.
• Install the pipe elbow on the pressure connec-
tion.
• Fasten the pressure hose to the pipe elbow
with a hose clip.
Alternatively, a Storz pipe coupling can be
installed on the pipe elbow and a Storz hose
coupling can be installed on the pressure hose.
2. Installing the pump: about 1-2 h
• Position pump in installation location. If neces-
sary, secure lifting equipment to the pump with
a shackle, lift the pump and then lower to the
intended location (pump chamber, pit).
• Check that the pump is vertical and on a solid
bearing surface. Avoid sinking.
• Route the power supply cable in such a way
that it cannot be damaged.
• Have the electrical connections made by a
qualified electrician.
• Route the pressure hose so that it is not
damaged and fasten it at certain points (e.g.
outflow).
RISK of pressure hose becoming separated!
Uncontrolled separation or movement of the
pressure hose can result in injuries. Secure the
pressure hose appropriately. Prevent buckling
of the pressure hose.
3. Commissioning the pump: about 1-3 h
• As described in the “Commissioning” section
5.3.4. Level control
Fill levels can be determined using the level
control system, meaning the pump is switched on
and off automatically. The fill level can be record -
ed using float switches, pressure and ultrasound
measurements or electrodes.
Note the following information:
• When using float switches, ensure that they can
move freely in the operating area!
• The water level must not fall below the minimum!
• The maximum switching frequency may not be
exceeded!