Wilo Padus UNI - Faults, Causes and Remedies

Faults, causes and remedies en
Installation and operating instructions Wilo-Padus UNI 23
1. Position 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 slowly, but do not unscrew it
completely. WARNING!Overpressure in the motor!
Stop turning the screw plug further if hissing or whist-
ling is audible! Wait until the pressure has completely
dissipated.
3. After the pressure has dissipated, fully unscrew the
screw plug.
4. Place a suitable tank to collect the operating fluid.
5. Drain the operating fluid: Rotate the pump until the
opening points downwards.
6. Check the operating fluid: Notify customer service if an
operating fluid contains metal chips!
7. Pour in operating fluid: Rotate the pump until the open-
ing points upwards. Fill-in the operating fluid into the
opening.
⇒ Comply with the specifications for operating fluid
locations and quantity!
8. Clean the screw plug, replace the seal ring and screw it
back in. Max. tightening torque: 8Nm (5.9ftlb)!
9.5.6 Adjusting the impeller clearance
When pumping wastewater and sewage, wear can occur at the
impeller. This lowers the pump’s output. The clearance between
the impeller and suction port can be adjusted to compensate for
impeller wear.
+-
1
3
4
1
1
2
Fig.9: Adjusting the impeller clearance (strainer removed)
1 Safety screws for fixing the clearance adjustment
2 Clearance adjustment
3 Dial
4 Pointer (▲)
+ Increase clearance
- Decrease clearance
‡ Strainer removed. See “Cleaning the strainer [}20]”
‡ Baseplate cleaned. The dial and pointer are discernible.
1. Loosen the safety screws until the clearance adjustment
can be turned. NOTICE!Do not completely unscrew the
screws!
2. Turn the clearance adjustment anti-clockwise(-) until
the counterplate rests against the impeller.
3. Increase the clearance by 3division marks: Turn the
clearance adjustment clockwise(+). Observe the pointer
when setting!
4. Tighten the safety screws. Max. tightening torque:
4Nm (3ft·lb)!
▶ Impeller clearance corrected. Refit the strainer.
9.5.7 General overhaul
During the general overhaul, the motor bearings, shaft sealings,
O-rings and power supply cables are checked for wear and dam-
age. Damaged components are replaced with original parts. This
will ensure correct operation.
The general overhaul is performed by the manufacturer or an au-
thorised service centre.
10 Faults, causes and remedies
DANGER
Danger due to fluids hazardous to health!
Danger of death in case of pumps with fluids hazard-
ous to health! Wear the following protective equip-
ment while performing the work:
• Closed safety goggles
• Breathing mask
• Protective gloves
⇒ The equipment listed here is the minimum re-
quirement, observe the specifications of the
work regulations! The operator must make sure
that the personnel have received and read the
work regulations!
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work
can lead to death due to electric shock! Electrical
work must be carried out by a qualified electrician in
accordance with the locally applicable regulations.