Description of devices and functions
Operating instructions ecoTEC plus 0020134822_01 7
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3 Description of devices and functions
3.1 Design
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3.1 Front view of the ecoTEC plus
Key
1 Controls
2 Plate with serial number on the rear
2 Front flap
The controls for your boiler are arranged behind the front
flap.
To access the controls, open the front flap as follows:
> Take hold of the recessed handle in the front flap.
> Fold down the front flap.
3.2 Function
Your Vaillant ecoTEC plus is a gas-fired wall-hung high-effi-
ciency boiler, which generates heat for heating and/or hot
water production.
VU boilers can be operated together with a domestic hot
water cylinder, which stores a larger volume of hot water.
3.2.1 Heating mode
In Heating mode, the boiler heats the hot water and sends
it through the radiators or underfloor heating of your home
(heating circuit). The hot water pumped into the heating cir-
cuit exits the boiler at a specific heating flow temperature,
emits its heat into the rooms and flows back into the boiler
once cooled to return temperature. The heating water is
then heated again.
3.3 Hot water production with domestic hot
water cylinder
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3.2 Drawing hot water
When you open a hot water valve (1) (sink, shower, bath,
etc.), the hot water is taken from the domestic hot water
cylinder.
Cold water than flows into the domestic hot water cylinder
in its place. If the hot water temperature in the domestic
hot water cylinder falls below the value set, then the boiler
operates automatically and reheats the domestic hot water
cylinder. As soon as the water in the domestic hot water
cylinder has reached the set temperature, the boiler
switches off.
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