Wilo T 12 Notice De Montage Et De Mise En Service page 72

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4.1.1 Hydraulics
4.1.2 Motor
Leakage chamber for condensate (condensa-
tion water)*
Roller bearing: permanently lubricated
Roller bearing: regular re-greasing
72
Product description
Centrifugal hydraulics with different impeller shapes, horizontal flange connection on
the pressure side, inspection cover as well as casing and impeller wear rings.
The hydraulics are not self-priming, in other words, the fluid must flow in either auto-
matically or with supply pressure.
Impeller shapes
The individual impeller shapes depend on the size of the hydraulics and not every im-
peller shape is available for every hydraulic system. The following is an overview of the
different impeller shapes:
▪ Vortex impeller
▪ Single-channel impeller
▪ Two-channel impeller
▪ Three-channel impeller
▪ Four-channel impeller
▪ SOLID impeller, closed or half open
Inspection cover (depending on the hydraulics)
Additional opening on the hydraulics housing. This opening is used to remove clogging
in the hydraulics.
Casing and impeller wear rings (depending on the hydraulics)
The suction port and impeller are subjected to the most stress when pumping. In the
case of channel impellers, the gap between the impeller and the suction port is an im-
portant factor for a constant efficiency. The larger the gap between the impeller and
the suction port, the higher the losses in the delivery rate. The efficiency decreases and
the danger of clogging increases. In order to ensure long and efficient operation of the
hydraulics, an impeller wear ring and/or casing wear ring is installed depending on the
impeller and the hydraulics.
▪ Impeller wear ring
The impeller wear ring is attached to the channel impellers and protects the incoming
flow edge of the impeller.
▪ Casing wear ring
The casing wear ring is installed in the suction port of the hydraulics and protects the
incoming flow edge in the centrifugal chamber.
The two components can be replaced easily when worn.
The system is driven by surface-cooled motors in three-phase current version. The mo-
tor is cooled by the fluid around it. The waste heat is transferred directly to the fluid or
the ambient air via the motor housing. The motor may emerge during operation. Opera-
tion is possible in dry well installation depending on the motor power.
The motors are provided with different fittings depending on the motor size:
▪ Roller bearing: permanently lubricated and maintenance-free or regular re-greasing
▪ Condensate (condensation water) in motor: can be drained off
Overview of motor fittings
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• •
− −
• = standard-equipped , − = not available
* NOTICE! In the case of Ex-rated motors, the condensation water cannot be drained
off from all motors. Depending on the motor, the drainage screw would be placed in
a spark-proof area!
The connection cable is longitudinally watertight and has bare cable ends.
• •
• •
− −
• •
− −
• •
WILO SE 2019-01