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Fig. 13: Dry well installation
6.4.7
Level control
6.4.8
Dry-running protection
Installation and operating instructions Wilo Motor T 12 ... 72 + EMU FA, Rexa SUPRA, Rexa SOLID
Installation and electrical connection
▪ Connect the pump to the pipe system ensuring that it is free of stress and vibrations. The
use of elastic connection pieces (compensators) is recommended.
▪ The pump is not self-priming, in other words, the fluid must flow in either automatically or
with supply pressure. The minimum level in the collecting space must be at the same height
as the upper edge of the hydraulics housing!
▪ Max. ambient temperature: 40 °C (104 °F)
Work steps
1
Gate valve
1
2
Non-return valve
2
3
Expansion joint
4
Attachment point for lifting equipment
5
Minimum water level in collecting space
‡
Machine room/installation location is prepared for the installation.
‡
Pipe system has been properly installed and is self-supporting.
1. Attach lifting equipment to the attachment point of the pump with a shackle.
2. Lift the pump and position it in the machine room.CAUTION! Hold the power supply
cables slightly taut when positioning the pump!
3. Fasten pump to the foundation properly.
4. Connect pump to the pipe system. NOTICE! Ensure the connection is free of stress
and vibrations. If required, use plastic connection pieces (compensators).
5. Loosen the lifting gear from the pump.
6. Have the power supply cables installed in the machine room by a qualified electrician.
▶ Pump is installed, the qualified electrician can carry out the electrical connection.
DANGER
Risk of explosion due to incorrect installation!
If the level control is installed within a potentially explosive area, the signal transmitter
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.
Using a level control device the current fluid levels can be determined and the pump auto-
matically switched on and off depending on the fluid level. The recording of the fluid level is
made here by various sensor types (float switches, pressure and ultrasound measurements
or electrodes). When using a level control device observe the following points:
▪ Float switches can move freely!
▪ The minimal permissible water level must not be undercut!
▪ The maximum switching frequency must not be exceeded!
▪ For strongly fluctuating fluid levels, a level control device with two measuring points is rec-
ommended. This means larger differential gaps are reached.
Dry-running protection must prevent the pump from being operated without fluid and air
from penetrating into the hydraulics. To do this the minimum permissible fluid level must be
determined using a sensor. As soon as the given limit value is reached, the pump must be
deactivated with a corresponding signal. Dry-running protection can expand existing level
control devices by an additional measuring point or work as a sole switch-off device. The
reactivation of the pump can take place automatically or manually depending on the system
security. For optimum operational reliability, the installation of a dry-running protection
system is recommended.
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