Protecting The Heating Installation Against Frost - Vaillant ecoFIT sustain 835 Operating Instructions Manual

▶
Fill the heating installation.
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◁
If you have topped up the install-
ation with sufficient heating wa-
ter, the display automatically dis-
appears after 20 seconds.
4.12.2 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.
1. Ask a competent person where the
filling cock is located.
2. Connect the filling tap to a heating wa-
ter supply in the way you were told by
the competent person.
3. Open all radiator valves (thermostatic
radiator valves) of the heating installa-
tion.
4. Open the heating water supply.
5. Turn the filling cock on slowly and al-
low water to flow in until the required
filling pressure has been reached.
6. Close the heating water supply.
7. Purge all radiators.
8. Check the filling pressure in the
display.
9. Top up with more water if necessary.
10. Close the filling cock.
11. Return to the basic display.
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0020230530_01 ecoFIT sustain Operating instructions
4.13 Protecting the heating
installation against frost
4.13.1 Frost protection function
Caution.
Risk of material damage due
to frost.
The frost protection function
cannot guarantee flow through
the entire heating installation,
which means that parts of the
heating installation may freeze
and therefore become dam-
aged.
▶
During a period of frost, en-
sure that the heating installa-
tion remains in operation and
that all rooms are sufficiently
heated, even when you are
away.
Note
To keep the frost protection
devices active, you should switch
your product on and off using the
controller, if one is provided.
If the heating flow temperature falls be-
low 5 °C when the on/off button is on, the
product comes into operation and heats
the circulating water to approx. 30 °C on
both the heating side and the hot water
side (if available).
4.13.2 Draining the heating
installation
When the unit is switched off for an exten-
ded period, frost protection can be guar-
anteed by completely draining the heating
installation and the product.
▶
Consult a competent person about this.
Operation 4
13