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9.2
Oil change
Fig. 3: Sealing chamber oil change
1
Sealing chamber screw plug
‡
Wear protective gloves!
‡
Pump is removed, cleaned and if necessary disin-
fected.
‡
Oil-resistant sealable collector tank is accessible.
1. Position the pump horizontally on a firm surface.
The screw plug should be on top. WARNING! Risk
of hands being crushed. Make sure that the pump
cannot fall over or slip!
2. Unscrew the screw plug slowly.
3. Place a collector tank underneath the pump.
4. Draining the oil: rotate the pump until the opening
points downwards.
5. Checking the oil: notify customer service if the oil
contains metal swarf!
6. Rotate the pump until the opening points upwards
again.
7. Filling the oil: pour the oil in through the opening.
⇒ Comply with requirements concerning oil type
and quantity!
8. Clean the screw plug, replace the seal ring with a
new one and fully screw it in.
9.3
General overhaul
Have the customer service team check the pump after
1,500 operating hours. All components will be checked for
wear and damaged components will be replaced.
10
Faults, causes and remedies
Pump not starting or switches off after a short time
1. Interrupted power supply
Installation and operating instructions Wilo-Rexa MINI3
Faults, causes and remedies
1
⇒ Check the electrical connection of the pump.
⇒ Have a qualified electrician check fuses/resid-
ual-current devices.
2. Thermal motor monitoring has been tripped
⇒ Allow the pump to cool down. The pump will
start automatically.
⇒ Pump switches on/off too frequently. Check
the switching cycle of the float switch.
⇒ Excessive fluid temperature. Check the tem-
perature. If necessary, use a different pump.
3. Suction port/strainer/impeller silted/clogged
⇒ Shut down the pump, remove it and clean it.
4. Float switch not operational
⇒ The float switch must be able to move freely.
Pump starts up, but does not supply fluid
1. Pressure pipe/discharge pipe clogged
⇒ Flush out the pressure pipe.
⇒ Flush out the pressure hose.
⇒ Remove any kinks in the pressure hose.
2. Swing check valve contaminated
⇒ Shut down the pump, remove it and clean the
discharge connection.
⇒ Replace faulty swing check valve.
3. Water level too low
⇒ Check inlet.
⇒ Pump is pumping at a too low level. Check the
switching cycle of the float switch.
4. Suction port/strainer silted/clogged
⇒ Shut down the pump, remove it and clean it.
5. Air in the pump/pressure pipe
⇒ Position the pump at a slight angle to allow air
to escape.
⇒ Install a bleed unit in the pressure pipe.
Delivery rate drops while the pump is running
1. Pressure pipe/discharge pipe clogged
⇒ Flush out the pressure pipe.
⇒ Flush out the pressure hose.
⇒ Remove any kinks in the pressure hose.
2. Suction port/strainer silted/clogged
⇒ Shut down the pump, remove it and clean it.
3. Air in the pump/pressure pipe
en
15
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