Wilo -Atmos BST Instrucciones De Instalación Y Funcionamiento página 53

12 Spare parts
12.1 Recommended stocking of spare
parts for two-year continuous op-
eration
Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
Faults Causes
•
•
Pump runs but provides
•
no water
•
•
•
Pump runs backwards
•
when switched off
Mechanical seal is defective
Mechanical seal leakage
•
•
Noise
•
•
Table 7: Mechanical faults
Obtain original spare parts only from a qualified specialist or Wilo customer service. To
avoid queries and order errors, please provide all pump and drive rating plate data with
every order.
It is recommended that maintenance and repair work on the pump is only carried out by
Wilo or authorised specialists!
CAUTION
Risk of material damage!
Trouble-free pump operation can only be guaranteed when original
spare parts are used.
Use only original Wilo spare parts!
Information to be provided when ordering spare parts: Spare part num-
bers, spare part designations, all data from pump and drive rating plate.
This helps prevent return queries and incorrect orders.
Specify the number of spare parts required!
Part no. Designation
4 Impeller
- Ball bearing
6/3 Mechanical seal
2/8 Flat gasket/O-ring
(set)
Remedy
Suction pipe/pump •
clogged by impurities •
Foot or non-return valve
blocked in closed position
•
Leakage in suction pipe •
Air in suction pipe or
pump •
Incorrect direction of ro-
tation of the motor
Leakage in suction pipe •
Foot or non-return valve •
is defective
Replace mechanical seal (contact
service)
Cavitation occurs in the •
pump •
Pump does not rotate •
freely (friction resistance)
because of the incorrect
•
pump shaft position
Ratio of system pressure
to pump pressure is too
low
Frequency converter not
running
Number of pumps (including standby pumps)
2 3 4 5
Number of spare parts
1 1 1 2
2 2 4 4
2 2 4 4
4 6 8 8
en
Clean pump and suction pipe
Repair the foot or non-return
valve
Repair the suction pipe
Check the suction conditions,
vent the system
Change motor wiring (3 phase
motor: swap phases)
Remove leakage
Repair the foot or non-return
valve
Check the suction conditions
Realign pump shaft
Improve system or choose a
suitable pump
Check the frequency con-
verter operation
6 and 7 8 and 9 10 and
more
2 3 30%
6 8 100%
6 8 100%
9 12 150%
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