English
14
WILO AG 05/2008
6 Description and function
6.1 Description of the pump (Fig. 1))
The submersible pumps in the Wilo-Drain STS 65
series consist of:
• Pressure encapsulated, watertight single-phase
or three-phase motor in stainless steel (1.4404 /
AISI 316L)
• Hydraulics in cast iron EN-GJL-250 (GG25)
The fluid penetrates from underneath through a
central opening and emerges from the pressure
port (DN 65) at the side. The sealing chamber
between the seal on the fluid side and the motor
side is filled with white oil when delivered. The oil
filling is used for cooling, lubricating and protect-
ing the two seals against dry running. White oil is
biologically degradable. The oil volume depends
on the type of motor, see 5.2. of the Technical
data.
The motors are equipped with thermal motor pro-
tection (thermal winding contact) against over-
heating.
• Motor 1~:
One winding protection contact (WSK)
on the flex L. After excessive heating, the pump is
switched off and then switched on again auto-
matically after it has cooled down.
• Motor 3~:
Three winding protection contacts
(WSK), one contact in each winding head. The
thermal winding contact must be connected to
the switchgear and evaluated there. The pump is
switched off after excessive heating. The fault
must be acknowledged via the switchgear.
7 Installation and electrical connection
DANGER! Risk of fatal injury!
Incorrect installation and improper electrical
connections can result in a risk of fatal injury.
• The installation and electrical connections
should only be done by properly skilled staff and
in compliance with the applicable regulations!
• Follow all accident prevention regulations!
7.1 Installation
The pumps of the Wilo-Drain STS 65
series are
standard for stationary/portable wet well installa-
tions. They are also suitable for stationary dry well
installation, vertically or horizontally.
CAUTION! Danger of property damage!
Danger of damage due to incorrect handling.
Using a chain or rope, only suspend the pump by
the handle or holder, never by the electric or
float switch cable or pipe/hose connection.
General
• The installation site for the pump must be free of
frost.
• The shaft must be cleared of coarse material such
as rubble before setting up and starting the pump.
• The pressure pipe must have the nominal diameter
of the pump (DN 65; it can be upgraded to DN 80).
• Install the pipes so that they are stress-free. Fix
the pipes so that the pump does not carry the
weight of the pipes.
• To protect against any backflow from the public
drainage system, install the pressure pipe as a
loop. It must be above the established backflow
level (usually street level).
• In the case of a stationary installation, install a
non-return valve and a stop valve with full pas-
sage cross-section in the pressure pipe. In double
pump systems, these fittings must be installed
over each pump.
NOTE: It is best to install the fittings outside in an
additional sump (fittings sump). If this is not fea-
sible, the fittings should not be connected directly
to the pressure port or the pipe bend. A device to
vent the pump must be provided. Otherwise the
air cushion cannot open the non-return valve.
"Original-Wilo-accessories" are recommended to
guarantee perfect functioning of the pump.
7.1.1 Stationary wet well installation (Fig. 2)
• The fixed pipe connections on the pressure side
must be provided on site.
• Mount the foot elbow with the floor fixing acces-
sories on the bottom of the sump and align it.
• Connect the pressure pipe with the necessary fit-
tings (accessories) on the foot elbow.
• Fix the pump bracket, profile joint on the pressure
port of the pump.
• Plug R1 ¼“ guide pipe (to be provided on site) on
to the foot elbow.
• Suspend the pump in the guide tube and lower
carefully on the chain. The pump reaches the cor-
rect operating position automatically and seals
the pressure connection on the foot elbow
through its dead weight.
• Fix the chain on the guide tube bracket with
shackle (provide on site).
Pos. Description of the
component
Pos. Description of the
component
1
Electrical connection
cable
6
Oil chamber
2
Handle/holder
7
Lantern
3
Cooling jacket
8
Mechanical seal
4
Return pipe
9
Pump housing
5
Rotary shaft seal or
mechanical seal
10
Impeller
Pos. Description of the
component
Pos. Description of the
component
1
Foot elbow
4
Bend
2
Non-return valve
5
Installation accessories
3
Gate valve
6
Chain
