Product Description; Proper Use And Fields Of Application; Operating Modes; Technical Data - Wilo Sub TWI 4 Serie Einbau- Und Betriebsanleitung

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4 Product description

The product has been manufactured with great care
and is subject to constant quality controls. Trouble-
free operation is guaranteed if it is installed and main-
tained correctly.

4.1 Proper use and fields of application

The submersible motor pumps are suitable for:
• Potable and non-potable water supplies from drilled
holes and cisterns
• Domestic water supplies
• Communal water supplies, sprinkler and flood irrigation
• Booster stations
• Lowering the water table
• Pumping water for industrial uses
• Pumping water without long-fibered and abrasive
components
The submersible motor pumps must not be used for
pumping the following:
• Waste water
• Sewage/feces
• Raw sewage
Beware of electrical current
When using the product in swimming pools or
other accessible pools, there is a risk of fatal
injury due to electrical current. Note the follow-
ing information:
Use is strictly forbidden if any persons are in the
pool!
If the pool is unoccupied, protective measures
must be taken according to DIN VDE 0100-
702.46 (or the appropriate national regulations).
Proper use also includes observation of these instruc-
tions. Any other use is regarded as improper.
4.1.1 Pumping of drinking water
When using to pump drinking water, the locally appli-
cable guidelines/laws/regulations should be reviewed
as to whether the product is suitable for this purpose.
4.2 Construction
The Wilo-Sub TWI... is a water-proof submersible
motor pump which can be operated vertically and hori-
zontally in a stationary position.
Fig. 1: Description
1 Cable
2 Intake port
3 Motor housing
4.2.1 Hydraulics
Multistage hydraulics with radial or semi-radial rotors in
a sectional design. The hydraulic housing, the pump
shafts and the rotors are made of stainless steel. The
discharge side connection is designed as a vertical
32
4 Hydraulic housing
5 Discharge port
threaded flange with inner thread and integrated back-
flow preventer.
The product is not self-priming, in other words,
the pump medium must flow with primary pres-
sure or taper automatically and a minimum level
of submergence must always be ensured.
4.2.2 Motor
AC or three-phase motors filled with a water-glycol
mixture are used for direct start-up. The motor hous-
ing is made of stainless steel. The motors have a 4"
Nema connector.
The motor is cooled by the pumped medium. The
motor must therefore always be submerged when
operated. The thresholds for max. liquid temperature
and minimum flow speed may not be exceeded.
The connection cable is longitudinally water-proof and
fixedly connected to the motor. The version will
depend on the particular type:
• TWI 4- ...: with free cable ends
• TWI 4-... QC: Connection cable with QuickConnect
linkage for fast and easy installation of QuickConnect
cable assembly kits; cables with free ends
Note the IP protection class of the switching
device.
4.2.3 Sealing
The seal between motor and hydraulics is made by a
rotary shaft seal, or a floating ring seal (for motors of
2.5 kW or greater).

4.3 Operating modes

4.3.1 Operating mode "S1" (continuous operation)
The pump can operate continuously at the rated load
without exceeding the maximum permissible tempera-
ture.

4.4 Technical data

General data
• Mains supply: see type plate
• Rated motor capacity P
• Max. pump head: see type plate
• Max. pump flow: see type plate
• Activation type: direct
• Liquid temperature: 3 to 30 °C
• Protection class: IP 68
• Isolation class: B
• Speed: see type plate
• Max. submersion: 350 m
• Starts per hour: max. 20
• Max. sand content: 50 mg/m³
• Discharge port:
• TWI 4-01...: Rp 1¼
• TWI 4-02... : Rp 1¼
• TWI 4-03... : Rp 1¼
• TWI 4-05... : Rp 1½
• TWI 4-09... : Rp 2
• TWI 4-14... : Rp 2
• Min. flow at the motor: 0.1 m/s
• Operating modes
• Submerged: S1
: see type plate
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WILO SE 10/2011 V4.1WE