English
Installation and operating instructions Wilo-MVIS 15, 30, 50
5
6 Description and function
6.1 Product description
See fig. 1
1 - Mounting base
2 - Stages
3 - Impellers
4 - Shaft
5 - Air bleed screw
6 - Drain-priming plug
7 - Companion Flange
8 - Wet rotor motor
9 - Terminal box
10 - Outer casing
See fig. 3:
2 - Pump suction valve
3 - Pump discharge valve
4 - Check valve
5 - Air bleed screw
6 - Drain-priming plug
7 - Pipe supports
8 - Strainer
9 - Storage tank
10 - Town water supply
11 - Motor starter with circuit breaker
12 - Lifting hook
13 - Foundation block
HC: Minimum inlet pressure
6.2 Design of pump and motor
Multiple-stage vertical pump (2 to 8 stages) with a
wet-rotor motor. Inline piping connection.
In the wet-rotor pump all rotating parts are sur-
rounded by the liquid being pumped.
The pumping medium lubricates the bearings and
cools both bearing and rotor.
7 Installation and electrical connection
Installation and electrical work in compliance with
any local codes and by qualified personnel only!
7.1 Installation
• The pump must be installed in a dry, well-ventilated
and frost-free place.
Install the pump in a dry place p
• rotected from frost.
• The installation surface must be level and flat: any
tilting of the pump could cause premature bearing
wear.
• Install the pump on a concrete block (at least 4” /
10 cm high) to avoid any noise and vibration trans-
mission into the installation.
• Place the pump where it will be easy to reach, to
facilitate inspection and removal and/or repair work.
The pump must always be installed perfectly upright
on a sufficiently heavy concrete base.
• The installation and connection dimensions are
shown (see paragraph 5.2).
• For especially heavy pumps, place a hook or a ring of
sufficient capacity (total weight of pump) to allow
the use of a hoist or similar device for the servicing
and repair of the pump.
• When fitting the oval flange, only the screws sup-
plied should be used. The use of longer screws might
damage the base of the pump.
• The flow direction of the fluid is indicated on the
identification label of the pump.
• Pump must be installed in such a way that it is not
stressed by the pipework. The pipes must be
attached so that the pump does not bear their
weight.
• It is recommended that isolation valves be installed
on the suction and discharge side of the pump. This
will save having to drain and refill the system if the
pump needs repair and/or replacement. The valves
are to be installed so that any water that escapes
cannot drip onto the pump motor or terminal box.
• Provide a minimum of three pipes diameters of
straight pipe on the suction side of the pump.
• A check valve should be placed on the discharge
pipe.
WARNING! Bodily injury
Existing regulations for the prevention of acci-
dents must be observed.
WARNING! Electrical shock hazard
Dangers caused by electrical energy must be
excluded.
National Electrical Codes, local codes and regula-
tions must be followed.
CAUTION! Possible damage of the pump
Dirt and foreign material in the pump volute can
effect the pump operation.
It is recommended that any welding and soldering
work be done before installing the pump.
Thoroughly flush the system out before installing
the pump.
WARNING! Risk of scalding!
If the pump is already installed in the system, the
system must be drained or the isolating valves on
both sides of the pump must be closed before the
socket head screws are removed as the pumped
liquid may be scalding hot and/or under pressure.
The pump must be positioned so that someone
cannot come into contact with the hot pump sur-
faces while operation.
