23
Refit the protective caps on the fill valves.
Determine the fill pressure
Volume of the diaphragm expansion vessels integrated into the
appliance
l 15
Expansion vessel pre-charge pressure ( P0 ) bar 0.75
If the height difference ∆h between the highest point of the heating
system and the diaphragm expansion vessel is no more than 6m,
the diaphragm expansion vessel can be used without any changes
being required.
Fill the heating system to a pressure of at least 1.1bar
(P0+0.3bar). Observe the safety valve‘s response pressure
of 3bar.
If the height difference between the highest point of the heating
system and the diaphragm expansion vessel is more than 6m, the
pre-charge pressure needs to be adapted.
Calculate the pre-charge pressure:
P0 =
∆h
10
+ 0,2 bar
D0000081230
Note that the heating system fill pressure increases
accordingly.
Check whether a further external diaphragm expansion ves-
sel needs to be installed.
Fill the heating system to the appropriate pressure
(P0+0.3bar). Observe the safety valve‘s response pressure
of 3bar.
Filling the heating system
!
Material losses
High flow rates or water hammer can damage the ap-
pliance.
Fill the appliance at a low flow rate.
1
D0000039056
1 Drain connection for filling and draining the heating circuit
Undo the cap from the drain connection.
Connect the fill hose with a quick-action hose coupling.
Open the drain connection by turning the star grip.
1
D0000038979
1 Air vent valve on the multifunction assembly
Open the air vent valve of the multifunction 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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