Changing the Membrane
1. Turn off the electricity and water supply. If necessary, release the water from the piping sys-
tem.
2. Disconnect the vessel from the piping system and expel the air via the pre-charge valve.
3. Loosen the counter-flange screws and remove the flange.
4. Exchange the rubber membrane.
5. Mount the counter-flange back into place and tighten the screws again.
6. The pre-charge needs to be installed again.
7. Check the counter-flange area for leaks.
8. Connect the vessel back to the piping system.
9. Repeat the previously stated installation steps.
Maintenance and care instructions
The pressure vessel should be checked annually by a specialist who is able to carry out main-
tenance work.
Before any maintenance work is carried out, the vessel needs to be taken out of operation,
thus remove the vessel from the electricity and let it cool down.
Ensure that the pre-charge pressure matches the one stated on the type label. The max. toler -
ance of the pressure is ±20 %.
The pre-charge pressure should be lower than the start-up pressure of the pressure switch
and 0.1–0.2 bar below the start-up pressure of the pump.
Never demount the vessel if it is not entirely empty and without pressure.
Check the pre-charge and working pressure several times a year.
Before buying a replacement EPDM rubber membrane, the diameter of the opening needs to
be determined. The membrane diameter is the same as the vessel opening. You can find suit-
able membranes and other wearing parts at www.wiltec.de.
Important notice:
The reprint or reproduction, even of excerpts, and any commercial use, even in part of this instructions
manual require the written permission of WilTec Wildanger Technik GmbH.
© by WilTec Wildanger Technik GmbH Item 50600, 50602, 50640–50643, 50645–50648
Page 6
http://www.WilTec.de
http://www.aoyue.eu
01 2021
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