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Connections
Pipework
Central heating boiler
Filling the heating system
Draining the heating system
8
Installation / maintenance
Venting
Safety flow
Flue pipe connection
Draining, filling
Connect the heating flow and return to the respective boiler fittings. For connections,
see above.
Install a check valve behind the boiler circuit pump(s) to prevent incorrect circulation.
Install a safety equipment assembly.
Please note:
The pipework between the boiler and the safety valve must not be able to be shut off.
Connect underfloor heating via a four-way mixer.
Provide system separation by means of a heat exchanger, when using pipes which are
not impermeable to oxygen.
The boiler and central heating system may only be filled, if a type-tested safety valve
(opening pressure max. 3 bar) has been installed at the "ventilation" connection of the
boiler.
Install a filling/drain valve to fill the central heating system at the "drain, filling"
connection, and connect a water hose.
Observe the pressure gauge in the safety equipment assembly when filling the system
with water.
Check the safety valve function.
Ventilate the boiler (automatic air-vent valve).
Shut down the heating system and let it cool down.
Open the drain valve on the boiler.
Open the radiator bleed valves.
Boiler flow
Boiler return
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