Filling The Heating System; Venting The Appliance - STIEBEL ELTRON HSBB 3 S Bedienung Und Installation

INSTALLATION
Installation

11.5.1 Filling the heating system

Material losses
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Never switch on the power before filling the system.
In the delivered condition, the diverter valve of the MFG is po-
sitioned at the centre, enabling the heating and DHW circuits to
be filled evenly. When power is switched on, the diverter valve
automatically moves into the central heating position.
To fill or drain the system later, you must first place the diverter
valve into its centre position.
For this, enable controller parameterDRAIN HYDin the DIAGNO-
SIS°/ RELAY TEST SYSTEM menu.
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1 Diaphragm expansion vessel (heating system)
2 Cap shut-off valve
3 Drain valve (heating system)
f Fill the heating system via the drain valve. f
f After filling the heating system, check the cap shut-off valve f
at the diaphragm expansion vessel for tightness.
f Vent the pipework. f
11.5.2 Filling the DHW cylinder
1 Drain valve (DHW cylinder)
f Fill the DHW cylinder via the drain valve. f
f Open all downstream draw-off valves/taps until the appli- f
ance is full and the pipework is free of air.
f Carry out a tightness check. f
f Check the safety valve. f
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11.6 Venting the appliance

Multi-function assembly (MFG)
f To vent, temporarily open the quick-action air vent valve in f
the multi-function assembly (MFG).
1 Quick-action air vent valve
2 PCB
Material losses
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The air vent in the knurled cap of the quick-action air vent
valve must not point towards the MFG PCB.
f Turn the air vent in the direction shown in the fol- f
lowing diagram.
Material losses
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Close the quick-action air vent valve again after venting.
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HSBB 3 | 33