Wilo Drain TM 25_6 - Manual (Page 11)

English
10 WILO AG 10/2006
6 Description and function
6.1 Description of the pump (Fig. 2)
The pump can be completely immersed in the liq-
uid to be pumped. The pump housing is made of
plastic. The electric motor is protected from the
pump cavity by a shaft seal ring sealing the oil
cavity and by a mechanical seal which seals the oil
cavity from the water. To ensure that the
mechanical seal is always lubricated and cooled,
even when running dry, the mechanical seal
chamber is filled with oil.
The motor is cooled by the surrounding fluid.
The motor is equipped with integrated motor pro-
tection, which switches off on overload and auto-
matically switches on again after cooling down.
The pump is installed on the base of a shaft. When
in a fixed installation it is screwed to a fixed pres-
sure line. For a mobile installation it is connected
to a hose.
The pump is operated by plugging in the power
supply plug.
If the waste water line does not allow any inter-
ruptions, then a 2nd pump (automatic standby
pump) in conjunction with the necessary switch-
gear (accessories) increases the reliability in case
of a fault with the 1st pump.
6.2 The pump functions
Pump with a float switch:
The „TM...-A“ (Fig. 1) pumps work automatically
in that a float switch turns the pump on, via the
free cable length, once the water reaches a certain
level and turns it off again when it reaches a min-
imum water level.
Pump without a float switch:
The versions without a float switch are suitable for
use with external switching, for example using
switchgear (accessories). Level suction to 5 mm
(Fig. 1).
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 deigned 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 on the pipe / hose connection.
The installation site and shaft for the pump must
be frost-free. The shaft must be such that the
float switch („TM...-A“) is guaranteed free move-
ment. The diameter of the pressure pipe (pipe /
hose connection) may not be less than the diame-
ter of the pump's pressure port. To avoid loss of
pressure, make the pipe connection one size
larger.
Connection of the pressure pipe
• Pipe connection: For a fixed pump installation, we
recommend the use of the coupling supplied (Rp
1 / Rp 1¼) with an integrated non-return valve.
Seal the pipe connections to the pump pressure
port with Teflon tape. Constant leaks in this area
lead to the destruction of the non-return valve
and the screwed connection.
To prevent any flow back from the public sewer,
the pressure pipe should be arched so as to pass
above the locally determined backflow level (usu-
ally street level).
• Hose connection: The hose nozzle enables a hose
(Ø 20 or 25 mm) to be connected. The diameter of
the hose nozzle may have to be adapted by cut-
ting off the upper part to correspond to the diam-
eter of the hose.
With a mobile installation, the pump should be
secured in the shaft concerned to prevent it from
falling over or wandering off. (e.g. fix the chain
with a small amount of tension).
NOTE: When used in a pit without a firm base, the
pump must be put on a sufficiently large plate or
hung from a rope or a chain in a suitable position.
Pos. Description of component
1 housing
2 stator (winding)
3 handle
4 sheet metal screw
5 O-ring
6 sheet metal screw
7 radial shaft sealing ring
8 mechanical seal
9 O-ring
10 cover plate
11 seal housing
12 screw
13 seal
14 O-ring
15 shaft seal ring
16 O-ring
17 pump housing
18 spacing ring
19 impeller
20 suction basket
21 washer
22 spring washer
23 nut
25 connection cable
26 hose nozzle Ø 20, 25 mm
27 seal
28 float switch
29 coupling
30 non-return valve
31 fixing for non-return valve