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Installation and operating instructions • Wilo-Rexa MINI3 • Ed.03/2022-05
9
3.
Slide the pressure hose onto the hose connection at the pres-
sure port.
4.
Secure the pressure hose to the hose connection using the
hose clip.
5.
Position the pump at the installation site.
CAUTION! Use a hard surface or underlay at the installation
site to prevent sinking on soft substrate.
6.
Lay the pressure hose and fasten it in the appropriate place
(e.g. drainage).
CAUTION! If the pump is placed in a full
chamber, hold the pump at a slight angle when immersing.
This causes the air to escape from the pump!
7.
Route the connection cable to the socket/power supply.
▶
Pump is installed.
5.3
Electrical connection
•
Mains connection with correctly installed protective earth con-
ductor.
•
Residual-current device (RCD) is installed with 30 mA.
•
Mains connection fuse protection: max. 16 A.
•
Voltage (U) and frequency (f) data on the rating plate corres-
pond to the data of the mains connection.
Do
not
connect the pump if:
•
The connection cable is damaged
Have the connection cable replaced by a qualified electrician or
the customer service.
•
A standalone inverter is in use
Stand-alone inverters are used in autonomous power supplies,
e.g. solar power supply, and can generate overvoltages. Over-
voltages can destroy the pump.
•
A multiple plug socket or power strip is in use
•
An energy-saving plug is in use
This reduces the energy supply to the pump and the pump may
heat up too much.
•
Operation on start-up controls
The pump is not suitable for operation on a frequency converter
or a soft start control.
•
Explosive atmospheres
Do not connect and operate the pump inside potentially ex-
plosive atmospheres!
5.3.1
Connection: Pump with plug
Provide for a socket (type E or type F) with earthing contact. To
connect the pump, insert the plug into the socket.
NOTICE
Pump starts up or is ready for operation!
Once the plug is connected to the socket, the pump
will either start immediately or be ready for opera-
tion:
• Pump
without float switch
: pump switches on
immediately!
• Pump
with float switch
: pump is ready for oper-
ation and will switch on depending on the fill
level!
▶
We recommend switching the socket on and
off using a separate main switch!
5.3.2
Connection: Pump without a plug
DANGER
Risk of fatal injury due to electrical current!
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!
• Observe local regulations!
CAUTION
Irreparable damage as a result of water pen-
etration
Connection cables without plugs feature bare cable
ends. Water may penetrate the connection cable
and pump via these bare cable ends. This will des-
troy both the connection cable and the pump. Never
immerse the bare end of the connection cable in
fluid. Firmly seal it during storage.
The pump has a connection cable with bare cable end. The pump
must be permanently connected to a switchgear. Observe the fol-
lowing points:
•
Earth the device properly!
•
Provide a motor protection switch!
The minimum requirement is a thermal relay/motor protection
switch with temperature compensation, differential trip and re-
activation lock according to local regulations.
•
Install the mains disconnection device!
Minimum requirement: Main switch with all-pole disconnection.
Pump with single-phase AC motor
To connect the pump firmly to the switchgear, cut off the plug.
Carry out connection to a switchgear as follows:
Wire colour
Terminal in switchgear
Brown (bn)
L (phase)
Blue (bl)
N (neutral conductor)
Green/yellow (gn-ye)
Earth (protective earth con-
ductor)
Pump with three-phase AC motor
The pump is suitable for connection to a clockwise rotating field.
Check the rotating field with a rotating-field-testing device before
connection and correct if necessary.
CAUTION! The pump is not
approved for operation with a counter-clockwise rotating field!
Carry out connection to a switchgear as follows:
Wire colour
Terminal in switchgear
Brown (bn)
U
Black (bk)
V
Blue (bl)
W
Green/yellow (gn-ye)
Earth (protective earth con-
ductor)
Adjust the motor protection
Set the motor protection switch to the rated current (see rating
plate).
