Maintenance and checks / Shutdown
Shutdown
If the boiler is not in operation for several weeks, follow
the procedures described below:
• Clean the boiler.
• If there is a risk of frost, empty the system in ac-
cordance with the instructions from the heating
installer.
Maintenance and checks
The following tasks are usually carried out by
the heating engineer as part of the yearly main-
tenance. You should nevertheless conduct the
following checks throughout the year and per-
form the described procedures, if necessary.
Controlling the water level
If the water level in the system is too low (check
pressure gauge), inform your installer or top up
the water.
Refilling the heating system
• The boiler must be tension free! (disconnected from
the power supply).
• Open the shut-off valves in the flow and return
lines.
• Connect a hose filled with water (no air should
be introduced into the heating system) between
the boiler filling/draining cock and the water tap.
Unscrew the hose again after filling to break the
connection securely.
• Water quality: The heating system can normally be
topped up with mains water. No chemical additives
should be added to the water. The water quality can
vary strongly in different parts of the country (you
can obtain information about the water quality from
your local water) and it might not always be suitable
for filling the heating system (highly corrosive or
hard water).
Please contact your heating engineer in those
cases.
• Introduce the water slowly while controlling the
water level on the pressure gauge (the installer will
tell you the fill pressure for your system).
• Leave the bleed valves on the radiators open until
you can see only water flowing out.
The complete filling and emptying of the system must
be carried out by the heating engineer.
Caution:
Never fill the hot system with cold water.
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