Wilo Rexa MINI3-S, Installation And Operating Instructions Manual

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8 Installation and operating instructions • Wilo-Rexa MINI3-S • Ed.01/2022-03
• Carry the pump by the handle. Never carry or pull on the con-
nection cable!
• Clean the pump and disinfect if necessary.
• Close the discharge connection.
• Protect the connection cable against kinking and damage.
• Use original packaging for transport and storage.
• Pack the pump when dry. Wet or humid pumps may soften the
packaging.
• Storage conditions:
–
Maximum: -15 ... +60 °C (5 ... 140 °F), max. humidity: 90 %,
non-condensing
–
Recommended: 5 ... 25 °C (41 ... 77 °F), relative humidity:
40 … 50 %
5 Installation and electrical connection
5.1 Installation types
• Vertical stationary wet well installation
• Vertical portable wet well installation
5.2 Installation
• Wear protective equipment!
• Do not install a damaged or defective pump.
• Frost-free location.
• Lay the connection cable properly. During operation there must
be no danger (stumbling, damage, etc.).
• Float switch must be able to move freely!
5.2.1 Stationary wet well installation
A suspension unit must be installed for the stationary wet well in-
stallation. The on-site discharge pipe is connected to the suspen-
sion unit. The pump is connected to the suspension unit via a
coupling connection. Observe and adhere to the following points:
• The connected discharge pipe must be self-supporting. The
dischargee pipe must not be supported by the suspension unit.
• The discharge pipe must not be smaller than the pump’s dis-
charge connection.
• Install all specified valves in accordance with local requirements
(gate valve, non-return valve).
• Lay the discharge pipe frost-proof.
• Air pockets in the pump and in the discharge pipe can lead to
delivery problems.
Installing the ventilation systems:
–
E.g. Air vent valve
–
In the discharge pipe
–
Before the non-return valve
• Install the discharge pipe as a “pipe loop” to avoid backflow
from the main public sewer.
At its highest point, the bottom edge of the pipe loop must be
above the locally determined backflow level!
485 mm
19 in
265 mm 10.5 in
min. 405 mm
min. 16 in
390 mm 15 in
460 mm 18 in
160 mm
6 in
195 mm
8 in
min. 100 mm
min. 4 in
OFF!
S1
S3
DN 40/50, PN 10
ANSI B16.1, Size 2, Class 125
1
2
3
4 5
Fig. 2: Overview of components and installation dimensions
1 Upper holder for the guide pipe
2 Guide pipe 26.9x2 mm (1.06x0.08 in)
3 Foot elbow
4 Coupling connection
5 Pump
Fill level above: Continuous duty (operating mode im-
mersed)
Fill level below: Intermittent periodic duty (operating mode
non-immersed)
OFF Switch-off level
The following accessories are required for installation:
• Suspension unit DN40/50 (article number: 2057179)
Consisting of foot elbow, coupling connection and upper
holder.
• Two guide pipes 26.9x2 mm (1.06x0.08 in), length: 6 m (19.7 ft)
(article number: 6049244)
• Stainless steel lifting chain, length: 6 m (19.7 ft) (article number:
6084893)
• Installation sundries DN40/50/65 (article number: 6076963)
✓ Suspension unit installed.
✓ Pressure pipe properly installed.
✓ Lifting chain installed on the carrying handle.
1. Attach the coupling connection to the discharge connection
of the pump.
2. Lift the pump. Thread the coupling connection onto the guide
pipes.
3. Drain the pump at the guide pipes up to the foot elbow.
4. Attach the lifting chain to the pump chamber opening.