Cleaning The Expansion Relief Valve; Procuring Spare Parts - Vaillant 305827 Installation Instructions Manual

¯ If water continuously escapes, the non-return
valve (10) is defective. In this case, replace the
safety assembly.
6. Each time the domestic hot water cylinder is
started up again, open the isolation valves (6)
and (7) fully.
7. Each time maintenance work is carried out on
the domestic hot water cylinder (at least every
two years), check that the safety assembly is
working correctly.
6.3

Cleaning the expansion relief valve

i
Note
The expansion relief valve can be cleaned
without changing the operating pressure.
1. Use the handwheel (7) to close the isolation
valve.
2. Drain the domestic hot water cylinder.
Installation instructions 0020230764_00
Care and maintenance
A
B
3. Remove the upper section (1) of the expansion
relief valve.
4. Remove the valve insert (2).
5. Clean the seal (3) and the valve seat (4). Replace
any defective seals.
6. Reinstall the valve insert and upper section.
7. Open the isolation valve and check that the
expansion relief valve is leak-tight.
6.4

Procuring spare parts

The original components of the product were also
certified by the manufacturer as part of the declara-
tion of conformity. If you use other, non-certified or
unauthorised parts during maintenance or repair
work, this may void the conformity of the product
and it will therefore no longer comply with the appli-
cable standards.
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