Filling The Heating Installation; Selecting The Operating Mode; Setting The Hot Water Temperature; Setting The Heating Flow Temperature - Vaillant HOME SYSTEM 12 -A Operating Instructions Manual

4.4 Filling the heating installation

Caution.
Risk of material damage due
to heating water that is ex-
tremely calciferous or corros-
ive or contaminated by chem-
icals.
Unsuitable tap water damages
the seals and diaphragms,
blocks components in the
product and heating installation
through which the water flows
and causes noise.
▶
Only fill the heating install-
ation with suitable heating
water.
▶
In case of doubt, ask a com-
petent person for details.
Note
The competent person is respons-
ible for filling the heating installa-
tion the first time, any subsequent
top-ups and the water quality.
The operator alone is respons-
ible for topping up the water in the
heating installation.
1. Open all radiator valves (thermostatic
radiator valves) of the heating installa-
tion.
2. Slowly open the filling cock, as shown
to you by the competent person.
3. Fill with water until the required filling
pressure is reached.
4. Check the filling pressure in the
display.
5. Close the filling cock after filling.
0020224356_00 HOME Operating instructions

4.5 Selecting the operating mode

Note
The unit is always activated with
the preselected operating mode.
▶
Press repeatedly until the display
shows the required operating mode.
Symbol Operating mode
Heating + hot water
+
Heating only
Hot water only
‒
No requirement
4.6 Setting the hot water
temperature
Conditions: The temperature is controlled via the
domestic hot water cylinder's thermostat.
▶
Set the hot water temperature on the
controller.
Note
If you press the
the display shows the
bol.
Conditions: The temperature is controlled via the
domestic hot water cylinder's temperature sensor.
▶
Set the hot water temperature on the
controller.
4.7 Setting the heating flow
temperature
Conditions: Temperature controlled by the boiler,
with heating mode activated
▶
Set the heating flow temperature on the
boiler (→ Page 12).
Note
The competent person may
have adjusted the maximum
possible temperature.
Operation 4
or button,
sym-
11