Installation and electrical connection
en
Installation and operating instructions Wilo-Rexa CUT GE
19
Work steps
1
6
5
3
4
2
S1
S*
Fig. 6: Wet well installation, portable
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
S*
Non-immersed operating mode: Observe information on the rating plate!
‡
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 attachment point of the pump.
2. Lift the pump and lower it at the intended location (chamber, pit).
3. Place the pump on a solid bearing surface.
CAUTION! 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) in-
juries! Securely 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
DANGER
Risk of explosion due to incorrect installation!
If the level control is installed within a potentially explosive area, the signal trans-
mitter must be connected via an Ex cut-off relay or a Zener barrier. There is a risk of
explosion if connected incorrectly! Connection must be carried out by a qualified
electrician.
With a level control device, the current fill levels are determined and the pump is
switched on and off automatically depending on the fill levels. Fill levels are recorded by
using different sensor types (float switches, pressure and ultrasound measurements or
electrodes). The following must be observed when using a level control device:
▪ Float switches can move freely!
▪ The water level must
not fall below
the minimum permissible!
▪ The maximum switching frequency
must not be exceeded
!
▪ If the fill levels fluctuate strongly, a level control with two measuring points is recom-
mended. This makes it possible to achieve larger differential gaps.
6.4.6
Dry-running protection
Dry-running protection must prevent the pump from operating without fluid and air
from entering the hydraulics. The minimum permissible fill level must be determined
with the help of a signal transmitter. Once the specified limit value is reached, the pump
must be deactivated with an appropriate signal. Dry-running protection can expand the
available level controls by an additional measuring point or function as an independent
switch-off device. Depending on the system security, the pump can be restarted auto-
matically or manually. Installation of dry-running protection is recommended for op-
timum operational reliability.
6.5
Electrical connection
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.