Level Control; Dry-Running Protection - Wilo EMU FA Serie Instrucciones De Instalación Y Funcionamiento

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BEWARE of the pressure hose being pulled off!
Injuries may result from the pressure hose
being pulled or knocked off accidentally.
The pressure hose must be secured appropri-
ately. Avoid kinks in the pressure hose.
3. Starting up the pump: about 1 h
• As described in the "Commissioning" section
5.3.4. Stationary dry well installation
There is a divided operating area when the ma-
chine is installed in this manner: Collector tank
and machine area. The fluid is captured in the
collector tank, and the pump is fitted in the ma-
chine area. The operating area must be prepared
according to the design or the manufacturer's
planning guide. The pump is connected with the
suction- and pressure-side of the pipe system in
the machine room at the place listed. The pump
itself is not immersed in the fluid.
The suction- and pressure-side pipe system must
be self-supporting, i.e. it may not be support-
ed by the pump. In addition, the pump must be
connected to the pipe system without vibration
or tension. We therefore recommend the use of
elastic connection plugs (expansion joints).
The following temperatures must be complied
with for dry well installation:
• Max. fluid temperature: see rating plate or data
sheet.
• Max. ambient temperature: 25 °C.
The pump is not self-priming, which means that
the hydraulics housing must be filled complete-
ly with the fluid. The min. liquid level in the
collector tank must be the same height as the
top edge of the hydraulics housing.
BEWARE of burns!
The housing components can heat up to well
above 40°C. There is a risk of burns! After
switching it off, let the pump cool down to
ambient temperature.
Fig. 6.: Stationary dry well installation
1 Collector tank
2 Machine area
3 Gate valve
4 Non-return valve
Work steps
1. Installing the pump: about 1-2 h
• Check that the pipe system is firmly fixed.
• Secure the lifting equipment to the pump with
the shackle, lift the pump and lower slowly on
to the pipe system.
• When lowering, pay attention to the electric
power cables.
• If the pump is mounted on the pipeline, secure
it to the pipe system on the suction- and pres-
sure-sides.
54
5 Expansion joint
6 Pump
7 Min. water level
8

Dry-running protection

• Run the power supply cables in accordance
with the local regulations.
• Have the electrical connections carried out by
a qualified electrician.
2. Installing optional accessories, such as dry-run-
ning protection or level controllers.
3. Starting up the pump: about 1 h
• As described in the "Commissioning" section
• Open the slide valves on the suction- and
pressure-sides.
• Bleed the pressure pipe.

5.3.5. Level control

DANGER - explosive atmosphere!
If the level controller is located within a po-
tentially explosive area, the signal transmitter
must be connected via an Ex cut-off relay or
a Zener barrier! These are available as acces-
sories.
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 level sensors.
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 starts per hour may not be exceed-
ed!
• If the fill levels fluctuate strongly, then a level
control should be made on two test points as
standard. This means larger differential gaps are
reached.
Installation
For correct installation, please see the installation
and operation manual for the level control device.
Observe the information on the maximum starts
per hour and the minimum water level!
5.4. Dry-running protection
Make sure that no air enters the hydraulics
housing. The pump must therefore always be
immersed in the fluid up to the top edge of the
hydraulic housing. For optimum reliability, we
recommend installing a dry-running protection
system.
Correct running is ensured by float switches or
level sensors. The float switch or sensor is fixed
in the shaft and switches off the pump when
the water level falls below the minimum cover-
age level. If dry-running protection is only put
into effect with one float when fill levels deviate
significantly, then the pump may turn on and
off constantly! This can result in the maximum
number of motor activations (switching cycles)
being exceeded.
INSTALLATION
WILO SE 05/2014 v05 DIN A4