Protecting The Heating Installation Against Frost - Vaillant VU GB 806/5-5 Operating Instructions Manual

4 Operation
4.11 Protecting the heating installation against
frost
Caution.
b
Risk of damage caused by frost.
Frost protection and monitoring devices are
only active while the boiler is connected up
to the power supply and the on/off switch is
on.
> Do not isolate the boiler from the power
supply.
> Leave your boiler switched on at the on/
off switch.
Caution.
b
Tap water that is extremely calciferous
or corrosive or contaminated by chemi-
cals can cause damage to the boiler.
Unsuitable tap water damages the seals
and diaphragms, blocks components in the
boiler and heating installation through
which the water flows and causes noise.
> The boiler must be equipped with a sys-
tem separation device (plate heat
exchanger). Due to the low water con-
tent, special water treatment for the pri-
mary circuit is no longer necessary.
The heating installation and water pipes are sufficiently
protected against frost if the heating system remains on
and the rooms are sufficiently heated while you are away.
4.11.1 Activating the frost protection function
Your QQQQVaillant ecoTEC plus boiler is equipped with a
frost protection function:
If the heating flow temperature falls below 5 °C when the
main switch is on, the boiler comes into operation and
heats the circulating water to approx. 30 °C.
Caution.
b
Risk of damage caused by frost.
The frost protection function cannot guar-
antee flow through the entire heating
installation, which means that parts of the
heating installation may freeze and become
damaged.
> Make sure that the boiler remains on
whilst you are away.
> Make sure that the rooms are heated suf-
ficiently.
16
4.11.2 Draining the heating installation
Another way to protect the heating installation and the
boiler from frost when they are switched off for a very long
time is to drain them. You must ensure that the heating
installation and boiler are completely drained.
All the cold and hot water pipes in the house and in the
boiler must also be drained.
> Ask your competent person to drain the heating installa-
tion.
Operating instructions ecoTEC plus 0020134822_01