Description And Operation; Installation And Electrical Connection - Wilo Drain STS 40 A Serie Instrucciones De Instalación Y Funcionamiento

6. Description and operation

6.1 Pump description (Fig. 1)
Pos. Part description
1 Electrical connection cable
2 Cap nut
3 Cover with handle
4 Cover holder
5
Motor housing
6 Oil chamber seal cover
7
Oil chamber seal
8 Shaft seal ring
9 Impeller
10 Screw
11 Washer
13 Screw
14 Feed plate
15 Float switch
16 Cable holder
17
Cable entry seal
18 Screw
19 Motor cover seal
20 Shaft seal ring
21 Snap ring
22 Mechanical seal
23 Screw
24 Pump housing
25 Seal
The pump is made of stainless steel (motor) and
cast iron (hydraulics).
It is driven by a water pressure-tight, encapsulat-
ed motor. The pump and the motor have a shared
shaft. The fluid comes up through the central
suction opening and is pumped out through the
vertical discharge port.
The pumps are equipped with a single-stage
VORTEX impeller. It pumps solids of diameters
up to 40 mm diameter (not fibrous solids such as
grass, leaves and rags).
The pump is either permanently installed and
bolted to a fixed pressure pipe (R 1 ½), or set up
portably and connected to a hose.
The motor chamber is sealed from the pump
chamber using a mechanical seal on the fluid side
and a radial shaft seal on the motor side. To ensure
that the mechanical seal is always lubricated and
cooled, even when running dry, the mechanical
seal chamber is filled with oil.
The motors have thermal protection, switching
off the motor automatically on overheating, and
switching it on again after cooling down. The sin-
gle- phase motor has a capacitor to generate the
rotating magnetic field.
WILO SE 04/2014

7. Installation and electrical connection

DANGER! Risk of fatal injury!
Improper 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 applicable regulations!
• Follow all accident prevention regulations!
7.1 Installation
The pump was designed both for fixed and for
mobile installation.
CAUTION! Risk of damage to the pump!
Danger of damage due to improper handling.
Lift the pump using a chain or a rope attached
to the handle. Never lift using the power / float
switch cable or the pipe / hose connection.
The installation site or pit for the pump must be
free of frost.
The pit must be cleared of coarse material such as
rubble before setting up and starting the pump.
For the installation dimensions see the drawing
(Fig 3), pit dimension (Fig 2a).
The pressure pipe must have the same nominal
width as the pump (R 1½", can be enlarged). It
is essential that the pit allows the float switch to
move freely (Wilo-Drain STS 40)..
7.1.1 Stationary wet installation (Fig. 2a, 2b)
1-Non-return valve
2-Isolating valve
3-Overflow alarm control
4-Switchgear with connected float switch for pump
operation
5-Chain
6-Electrical connection motor cable
Fig. 2a:
Pump (Wilo-Drain STS 40) with single-phase
motor and optional overflow alarm control.
Fig. 2b:
Pump with three-phase motor. Switchgear with
connected float switch for one pump operation
and optional overflow alarm control.
For stationary wet installation with a fixed pres-
sure pipe, the pump must be positioned and fas-
tened to ensure the following:
• The connection to the pressure pipe does not
bear the weight of the pump.
• The load of the pressure pipe does not act on the
connection port.
Provide a 4 mm diameter hole on the discharge
pipe before the check valve for a possible venting
following a draining (Fig. 2a, 2b Pos. B)
English
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