Installation and electrical connection
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Installation and operating instructions Wilo-Rexa PRO
19
6.4.2.1
Rotate impeller
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction port. There is danger of limbs be-
ing severed! Protective gloves must be worn to protect from cuts.
‡
Pump is
not
connected to the mains!
‡
Protective equipment has been put on!
1. Place the pump horizontally on a firm surface.
WARNING! Risk of hands being
crushed. Ensure that the pump cannot fall over or slip away!
2. Reach into the hydraulics housing carefully and slowly from below and turn the im-
peller.
6.4.2.2
Check oil in the sealing chamber
+/-
Fig. 4:
Sealing chamber: Check the oil
+/-
Fill/drain the oil in the sealing chamber
‡
Pump is
not
installed.
‡
Pump is
not
connected to the mains.
‡
Protective equipment has been put on!
1. Place the pump horizontally on a firm surface. The screw plug points upwards.
WARNING! Risk of hands being crushed. Ensure that the pump cannot fall over
or slip away!
2. Unscrew the screw plug.
3. Place a suitable tank to collect the operating fluid.
4. Drain the operating fluid: Rotate the pump until the opening points downwards.
5. Check the operating fluid:
⇒ If the operating fluid is clear, reuse operating fluid.
⇒ If the operating fluid is contaminated (black), fill with new operating fluid. Dis-
pose of operating fluid in accordance with the local regulations!
⇒ Notify customer service if an operating fluid contains metal chips!
6. Pour in operating fluid: Rotate the pump until the opening points upwards. Fill-in
the operating fluid into the opening.
⇒ Comply with the specifications for operating fluid locations and quantity!
When recycling the operating fluid, check the quantity and if required adjust
it!
7. Clean the screw plug, replace the seal ring and screw it back in.
Max. tightening
torque: 8 Nm (5.9 ft lb)!
6.4.3
Stationary wet well installation
NOTICE
Delivery problems due to water level being too low
The hydraulics are self-venting. As a result, smaller air cushions are dissolved during
the pumping process. If the level of the fluid is lowered too much, the volume flow
can be interrupted. The minimum permissible water level must reach the upper edge
of the hydraulics housing!
The pump is installed in the fluid for the wet well installation. For this, a suspension unit
must be installed in the chamber. On the pressure side, the on-site pipe system is con-
nected to the suspension unit and on the suction side to the pump. The connected pipe
system must be self-supporting. The suspension unit must
not
support the pipe sys-
tem!
Note on non-immersed operation
▪ P 13 motor: The motor can be run non-immersed in “non-immersed” operating mode
(S1, S2-30, S3 25 %*).
▪ P 17 motor: The motor can be run non-immersed for short periods.
