Accessories; Description And Function - Wilo -Drain STS 40/10 3-400-50-2-10M KA Einbau- Und Betriebsanleitung

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5.4 Accessories

Accessories must be ordered separately:
• Switchgear for 1 or 2-pump operation
• external monitoring devices / tripping units
• level controller (level sensor / float switch)
• Accessories for transportable wet-well installa-
tion
• Accessories for stationary wet-well installation

6 Description and function

6.1 Description of the pump (Fig. 1)
Pos. Description of component
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, encapsu-
lated motor. The pump and the motor have a
shared shaft. The fluid comes up through the cen-
tral 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
10
switching it on again after cooling down. The sin-
gle-phase motor has a capacitor to generate the
rotating magnetic field.
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! Danger of material damage!
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)
Wilo AG 01/2007