Connecting The Heating/Dhw Circuit; Observe The Following Points For The Heating/Dhw Circuit; Air Vent Valve; Flushing The Heating System - Wolf BWL-1S-05 Installation And Operating Instructions Manual

17 Connecting the heating/DHW circuit
17.1 Observe the following points for the heating/DHW circuit
Return, heating / DHW 28 x 1
Flow, heating 28 x 1
Hose, safety valve DN 25
Flow, DHW 28 x 1
17.1.1 Air vent valve
17.1.2 Flushing the heating system
17.1.3 Filling the heating system
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Connecting the heating/DHW circuit
Connection for the
ventilation hose
An air vent valve must be installed at the highest point in the system.
The following points must be observed for the heating side:
− To prevent any existing dirt in the heating system from causing malfunctions in the
heat pump, the heating system must be thoroughly cleaned and flushed before
the heat pump is connected. This applies to new systems and in particular when
replacing an appliance.
− The flow and return on the heat pump side must be equipped with shut-off systems
and 2 BDF valves so that the condenser can be flushed when required.
Before commissioning, the system must be filled and vented.
− Open the locking cap on the air vent valve in the indoor module by one revolution.
− Open all heating circuits.
− Slowly fill the entire heating system while cold via the BDF valve at the return, up to
approx. 2 bar pressure (observe pressure gauge).
− Move the 3-way diverter valve manually from heating mode to DHW mode and
back again.
− Check the entire system for water leaks.
− Slowly open the expansion vessel.
− Switch the heat pump ON.
− Vent the heating circuits completely by going to the contractor level and selecting
the required pump under "Relay test". Then switch the pump ON for 5 seconds and
OFF for 5 seconds, five times in succession.
− When the system pressure drops below 1.5 bar, top up the water.
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