Wilo-Rexa FIT

Design

Submersible sewage pump for intermittent operation for stationary and portable wet well installation, as well as for the stationary dry well installation.

Application

Pumping of

• Sewage containing faeces in accordance with EN 12050-1
• Wastewater

Type key

Technical data

• Mains connection: 1~230 V, 50 Hz or 3~400 V, 50 Hz
• Immersed operating mode: S1
• Non-immersed operating mode: S2-15 min; S3 10%
• Protection class: IP 68
• Insulation class: F
• Fluid temperature: 3 - 40°C, max. 60°C for 3 min
• Free passage: 50 / 65 / 80 mm
• Cable length: 10 m

Equipment/function

• Winding temperature monitoring with bimetal strip
• Optional external pencil electrode for sealing chamber control

Description/design

Submersible sewage pump as submersible monobloc unit for stationary and portable wet well installation, as well as stationary dry well installation in intermittent operation.

Hydraulics

The outlet on the pressure side is designed as horizontal flange connection. The maximum possible dry matter is 8 % (depending on the hydraulics) Vortex impellers are used as the impeller shape.

Motor

The motors available are surface-cooled motors in single-phase version (with built-in operating capacitor) and three-phase version for the direct starting. The waste heat is given off directly to the surrounding fluid via the motor housing. These motors can operated immersed in continuous duty (S1) and non-immersed in short-time duty (S2) or intermittent operation (S3).

Furthermore the motors are equipped with thermal motor monitoring. This protects the motor windings against overheating. For units with single-phase AC motors this is built-in and switches automatically. I.e. if the motor is switched off due to overheating and then cools down it is automatically switched on again. Bimetallic strips are used for this as standard.

In addition the motor can be equipped with an external sealing chamber electrode for monitoring the oil barrier chamber. This signals if there is water ingress into the oil barrier chamber through the mechanical seal on the fluid side.

The connection cable has a length of 10 m as standard and is available in following versions:

• With bare cable ends
• With plug
• With float switch and plug

Seal

There is a sealing chamber between the motor and hydraulics. This is filled with medicinal white oil. The fluid-side and motor-side seals are provided by two mechanical seals which rotate independently of each other.

Materials

• Motor housing: 1.4301
• Hydraulic housing: EN-GJL250
• Impeller: EN-GJL250
• Static seals: NBR
• Sealing on pump side: SiC/SiC
• Sealing on motor side: C/MgSiO₄
• Shaft end: Stainless steel 1.4021

Scope of delivery

• Submersible sewage pump with 10 m cable
• Cable version depending on the variant:
  • With bare cable ends (O)
  • With plug (P)
  • With float switch and plug (A)
• Operating and maintenance manual

Accessories

• Suspension unit or pump base
• External sealing chamber monitoring for monitoring the oil barrier chamber
• Chains
• Switchgears, relays and plugs
• Fixation sets with anchor bolts