Indications For Double Pump Operation - Wilo Rexa PRO Instrucciones De Instalación Y Funcionamiento

6.4.1 Indications for double pump oper-
ation
Fig. 3: Minimum distances
Installation and operating instructions Wilo-Rexa PRO
Installation and electrical connection
NOTICE
Use only properly functioning lifting equipment!
Use only properly functioning lifting equipment to lift and lower the pump. Ensure
that the pump does not become jammed during lifting and lowering. Do not exceed
the maximum bearing capacity of the lifting equipment! Check that lifting equip-
ment is functioning properly before use!
NOTICE
Emerging of the motor during operation
If the motor emerges during operation, observe the instructions for "non-immersed
operating mode"!
Motor P 17: To protect the motor winding from overheating, the motor must be
equipped with a temperature controller! If only one temperature limiter is installed,
the motor must not emerge during operation!
▪ Prepare operating space/installation location as follows:
– Clean, free of coarse solids
– Dry well
– Frost-free
– Decontaminated
▪ Take immediate countermeasures if there is a build-up of toxic or suffocating gases!
▪ Use the handle for lifting, lowering and transporting the pump. Never carry or drag the
pump by the power supply cable!
▪ It must be possible to attach lifting equipment safely. The storage place and the oper-
ating space/installation site must be accessible with the lifting equipment. The set-
down location must have a solid bearing surface.
▪ Attach the lifting gear to the handle using a shackle. Only use lifting gear which has
been technically approved.
▪ The routed power supply cables must allow safe operation. Check whether the cable
cross-section and the cable length are sufficient for the selected installation type.
▪ The corresponding IP class must be observed when using switchgear. Install the
switchgear overflow-proof and outside potentially explosive areas!
▪ Avoid air intake into the fluid, use baffles or deflector plates for the inlet. Air which has
entered the system can collect in the pipe system and lead to impermissible operating
conditions. Air pockets must be removed via ventilation systems!
▪ A dry run of the pump is prohibited! Avoid air pockets in the hydraulics housing or in the
pipe system. Ensure the water level never falls below the minimum. The installation of a
dry-running protection is recommended!
If several pumps are used in an operating space, minimum distances between the
pumps and the wall must be complied with. Here there is a difference in the distances
depending on the type of system: Alternating operation or parallel operation.
d Diameter hydraulics housing
Minimum distance from the wall:
A - alternating operation: min. 0.3 × d
1
- parallel operation: min. 1 × d
Distance to pressure pipes
A - alternating operation: min. 1.5 × d
2
- parallel operation: min. 2 × d
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