Dry-Running Protection - Wilo Rexa FIT Serie Notice De Montage Et De Mise En Service

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For portable installation, the pump must be equipped
with a pump support foot. The pump support foot en-
sures minimum ground clearance in the suction area and
enables secure footing if placed on a solid bearing sur-
face. In this installation type, the pump can be installed
anywhere in the operating space/installation site. A hard
base must be used at the installation location to prevent
sinking in case of soft bearing surfaces. A pressure hose
is connected on the pressure side. If operated for longer
periods of time, fix the pump firmly to the floor. This
prevents vibration and ensures quiet and low-wearing
running.
CAUTION! If the motor emerges during operation, ob-
serve the operating mode for non-immersed operation
(S2-15, S3 10 %*)!
* Operating mode S3 25 % is permitted if the necessary
motor cooling is guaranteed before the motor is
switched on again! To ensure the required cooling, the
motor must be completely immersed for at least 1 min.
Work steps
4
2
Fig. 6: Portable wet well installation
1 Pump support foot
2 Pipe elbow with hose connection or Storz pipe coupling
3 Storz hose coupling
4 Pressure hose
5 Lifting equipment
6 Attachment point
‡
Pump support foot mounted.
‡
Pressure connection prepared: Pipe elbow with hose
connection or pipe elbow with Storz coupling mounted.
1. Use a shackle to attach the lifting equipment to the at-
tachment point of the pump.
44
5
6
S1
3
S2 / S3
1
Installation and electrical connection
2. Lift the pump and lower it at the intended location
(chamber, pit).
3. Place the pump on a solid bearing surface. CAU-
TION! Sinking must be prevented!
4. Lay the pressure hose and fasten it to a certain point
(e.g. drainage). DANGER! Separation or movement of
the pressure hose can lead to (serious) injuries! Se-
curely attach the pressure hose to the outlet.
5. Lay the power supply cable properly. CAUTION! Do not
damage the power supply cable!
▶ The pump is installed, the qualified electrician can make
the electrical connection.
6.4.5 Level control
With a level control device, the current fill levels are de-
termined and the pump is switched on and off automati-
cally depending on the fill levels. Fill levels are recorded
by using different sensor types (float switches, pressure
and ultrasound measurements or electrodes). The fol-
lowing must be observed when using a level control
device:
▪ Float switches can move freely!
▪ The water level must not fall below the minimum per-
missible!
▪ The maximum switching frequency must not be ex-
ceeded!
▪ If the fill levels fluctuate strongly, a level control with
two measuring points is recommended. This makes it
possible to achieve larger differential gaps.
Use of attached float switch
The "A" version is equipped with a float switch. The
pump is switched on and off depending on the fill level.
The switching level is determined by the cable length of
the float switch.
Use of on-site level controls
When using an on-site level control device, refer to the
manufacturer's own installation and operating instruc-
tions for specifications on the installation.
6.4.6

Dry-running protection

Dry-running protection must prevent the pump from
operating without fluid and air from entering the hy-
draulics. The minimum permissible fill level must be de-
termined with the help of a signal transmitter. Once the
specified limit value is reached, the pump must be deac-
tivated with an appropriate signal. Dry-running protec-
tion can expand the available level controls by an addi-
tional measuring point or function as an independent
WILO SE 2019-02