Venting the boiler
1. Cl ose the shut-off v alves on the
heating water side.
2. Connect the drain hose on the
upper valve B withadrainoutlet.
3. Open valves A and B,andvent
at mains pressure, until no sound of
escaping air can be heard.
4. Cl ose valves A an d B, and open
the primary s hut-off valves.
Further details regarding the individual steps (cont.)
9
Initial start-up, inspection, maintenance
5692 537 GB
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