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34. Commissioning / maintenance
Commissioning
Installation and commissioning must only be carried out by a recognised
installation company.
After installation, thoroughly flush the pipes and cylinder, fill the cylinder with
water. Open the hot water tap until water flows out and check the safety valve
by venting.
Before commissioning, the cylinder must be filled and vented.
Caution
:
Do not exceed the maximum operating pressure of 10 bar for DHW
cylinders. A buffer cylinder on the heating circuit side may be subjected
to a max. pressure of 3 bar.
Exceeding the permissible operating pressure may result in leaks and
could destroy the cylinder.
Frost protection
Frost protection must be guaranteed on site.
After removing the flange, ensure a new gasket is fitted before reinstalling it;
tighten the nuts with a torque of 20-25 Nm.
Please note
Service flange
The system must be checked by a licensed installer at least
every 2 years.
If corrosion inhibitors are used in the process water (e.g. in underfloor
heating systems where the process water contains oxygen in low
concentrations), the corrosion protection must be checked.
Please note
Maintenance
Magnesium anode
When a magnesium anode is installed, the protective effect is based on the
electrochemical reaction, which results in the magnesium breaking down.
If the
magnesium anode has been used up, the cylinder is no longer protected
against corrosion. Consequence: Perforation corrosion, water leaks. The
anode must therefore be checked every 2 years by a qualified installer,
and replaced if used up by more than ⅔.
Release the cylinder pressure before replacing the anode.
Close the cold water connection, switch off the DHW circulation pump and open
any hot water tap in the house.
When draining the system, hot water may run out and cause injury, in
particular scalding.
To check the protective anode, connect an amp meter between earth and anode.
If the value measured is below 0.1 mA, replace the protective anode. Before
doing so, depressurise the cylinder, switch off the DHW circulation pump and
open a hot water tap in the house.
No maintenance is required if an impressed current anode is installed.
