7
Control, maintenance
and cleaning
4
When commissioning – as well as at least once a year – the correct function of the safety
valve has to be tested. If the safety valve is constantly dripping, this is probably caused by
contamination, the pressure in the water pipe exceeds the permitted value or the safety
valve is defect. If the pressure in the water pipe exceeds the permitted value, a pressure
reducer has to be installed.
IMPORTANT: During the heating, expansion water visibly leaks from the safety valve.
Do not close!
Safety valve
4.1
The storage tanks are enamelled on the drinking water side in accordance with DIN 4753 Part
3 and are supplied, depending on their size, including one or two pre-assembled magnesium
protective anodes. According to DIN 4753, Part 6, magnesium protective anodes must be te-
sted yearly and replaced every two years.
Optionally, maintenance-free impressed-current anodes of different makes can be
retrofitted. It is of utmost importance that all magnesium protective anodes integrated
in the storage tank are removed to prevent a disruption or malfunction of the impressed-
current anode. The impressed-current anodes may only be connected by qualified personnel
and according to the installation instructions of the manufacturer. The impressed-current
anodes are subject to the warranty conditions of the manufacturer.
Corrosion protection
4.2
Flanged aperture
4.3
Enamelled domestic water storage tanks
GB
Art. 516 005 211
Storage tank flange seal EPDM
for service hatch
If storage tanks are fitted with service hatches, the flange seal has to be checked in
regular intervals. A yearly interval is recommended.
After opening the flange, a new seal must be installed.
The nuts have to be tightened by hand first and then fastened diagonally with
a torque between 18 and 22 Nm.
