www.stiebel-eltron.com LWZ304-404 SOL | 19
INSTALLATION
Installation
5.7 Filling and venting the heating system
Depending on the heating system, check whether the expansion
vessels in the appliance meet the requirements (see chapter "Spec-
ification") and whether their pre-charge pressure is sufficient.
Checking the expansion vessels
1
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1 Fill valve of the expansion vessel
Remove the protective caps from the fill valves on the expan-
sion vessels.
Check the pre-charge pressure of the expansion vessel using
a pressure gauge. Please note that the system must be
non-pressurised.
Refit the protective caps on the fill valves.
Filling the heating system
1
D0000039056
1 Drain connection for filling and draining the heating circuit
Undo the cap from the drain connection.
Connect the fill hose.
1
D0000038979
1 Air vent valve on the multi function assembly
Open the air vent valve of the multi function assembly by
turning anti-clockwise.
D0000038979
1
1 Air vent valve on the circulation pump
Open the air vent valve on the circulation pump by pulling its
head upwards.
After venting, check whether the air vent valve of the multi
function assembly or circulation pump drips.
1
26_04_01_0556
1 Air vent valve of the DHW heating line
Open the air vent valve of the DHW heating line.
For filling, turn the lever on the drain connection 90°
anti-clockwise.
Switch on the appliance and set the displayed system
pressure at the programming unit ("PRESSURE HTG CIRC"
parameter).
Fill the system.
After filling close the drain connection.
Fit the cap on the drain connection.
You can check the water pressure in the heating circuit on the
programming unit with the "PRESSURE HTG CIRC" value.
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