Filling / Draining The Heating System - Wolf MGK-2-390 Installation Instructions Manual

Filling the heating system
Draining the heating system
52

28. Filling / draining the heating system

Fill the system correctly in line with the information on water treatment and
the system and operator's log, and vent it completely to ensure the smooth
running of the condensing boiler.
Before connecting the gas condensing boiler, flush the heating
Caution
system to remove residues such as welding pearls, hemp, putty,
etc. from the pipework.
• The gas tap must be shut.
• Open the air vent valves.
• Open all heating circuits.
• Open all radiator or mixer valves.
• Slowly fill the entire heating system and boiler when cold, for example via
the BDF valve at the return, to approx. 2 bar pressure.
Inhibitors are not permissible.
Caution
• Open the flow valves on the condensing boiler.
• Fill the heating system to 2 bar pressure. In operation, the pressure must be
between 1.5 and 2.5 bar.
• Check the entire system for water leaks.
• Fill both siphons with water.
• Vent the heating circuit; to do this, switch the gas condensing boiler ON and
OFF again several times.
• Top up with water when the system pressure falls substantially.
• Open the gas ball valve.
• Press the reset button on the AM or BM2.
Note: In constant mode, the heating circuit is automatically vented via the
air vent valve (accessory).
• Switch off system (see operating instructions) and allow it cool to at least
40 °C, otherwise there is a risk of scalding.
• Safeguard the heating system against accidental reconnection of the
power supply.
• Open drain valve (BDF valve), for example, on the boiler.
• Open the air vent valves on the radiators.
• Drain heating water.
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