Product Settings; Switching The Product To Standby Mode; Frost Protection - Vaillant HOME SYSTEM 12 -A Operating Instructions Manual

4 Operation
Conditions: Temperature controlled by the control-
ler, with heating mode activated
▶
Set the maximum heating flow temper-
ature on the boiler (→ Page 12).
▶
Set the room temperature on the con-
troller.
◁
The actual heating flow temperature
is set automatically by the controller.
Conditions: Outside temperature sensor connected
to the boiler, with heating mode activated
▶
When you press the
ton.
◁
The display shows the heating flow
temperature calculated by the boiler.
◁
The actual heating flow temperature
is set automatically by the boiler.

4.8 Product settings

Note
The sequence in which the avail-
able settings are shown depends
on the operating mode selected.
If the Domestic hot water + Heat-
ing operating mode is selected,
the hot water temperature must be
confirmed in order to set the flow
temperature of the heating.
1. Press the or
perature.
2. Press the button to confirm.
4.9 Switching the product to
standby mode
▶
Press the button for less than three
seconds.
◁
Once the requirement currently in
use has finished, the display will
show OFF and go out.
◁
The product is now in standby mode.
◁
The product's frost protection func-
tion is activated.
12
, or but-
button to set the tem-
◁
The main power supply is not inter-
rupted. The product continues to be
supplied with power.

4.10 Frost protection

4.10.1 The product's frost
protection function
The frost protection function switches on
the boiler and the pump as soon as the
protection temperature in the heating cir-
cuit is reached.
– Protection temperature: 12 ℃
The pump stops once the minimum wa-
ter temperature in the heating circuit is
reached.
– Minimum water temperature: 15 ℃
If the burner ignition temperature in the
heating circuit is reached, the burner
switch is switched on and continues
to operate until the burner anti-cycling
temperature is reached.
– Burner ignition temperature: 7 ℃
– Burner anti-cycling temperature: 35 ℃
The hot water circuit (cold and hot water)
is not protected by the boiler.
Frost protection for the system can only be
guaranteed by the boiler.
A controller is required to control the tem-
perature of the system.
4.10.2 Frost protection for the
system
Note
Ensure that the product's power
and gas supply are working cor-
rectly.
Conditions: If you are away from home for several
days, Without controller
▶
Switch the product to standby mode.
(→ Page 12)
Operating instructions HOME 0020224356_00