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18 Installation and operating instructions • Isar BOOST5 • Ed.06/2024-05
7 Maintenance
7.1 Maintenance of flow sensor
Fig.15: Flow sensor
✓ Depressurise the system by closing the gate valves on the suction and discharge sides.
✓ Empty the product through the drainage screw.
1. Remove the refill opening cap.
2. To remove the flow sensor, loosen the fastening screw.
3. Check the flow sensor and clean it if necessary.
4. Reinsert the flow sensor and ensure that it is aligned properly.
5. Put the refill opening cap back on.
7.2 Non-return valve suction connec-
tion maintenance
Fig.16: Non-return valve suction port
✓ Depressurise the system by closing the gate valves on the suction and discharge sides.
✓ Empty the product through the drainage screw.
1. Remove cover and handle grip.
2. Remove suction port.
3. Remove non-return valve.
4. Check the non-return valve and clean it if necessary.
5. Reinstall the non-return valve and make sure it fits properly.
6. Reinstall the suction port.
7. Refit the handle grip and cover.
7.3 Diaphragm expansion tank main-
tenance
CAUTION
Premature damage to the product due to incorrect maintenance!
• at least once a year (Wilo recommends: every 6 months): Check the
filling pressure of the diaphragm expansion tank and fill if necessary.
• Adjust the filling pressure of the diaphragm expansion tank every time
the operating pressure changes.
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