Operating instructions

Description of devices and functions
8 Operating instructions ecoTEC plus 0020116701_00
3
3 Description of devices and functions
3.1 Design
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2
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3.1 Front view of the ecoTEC plus (VU and VUW boiler)
Key
1 Controls
2 Plate with serial number on the rear
3 Front flap
The controls for your boiler are arranged behind the front
flap.
To access the controls, open the front flap as follows:
> Reach into the recessed grip 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.
VUI boilers are fitted with internal hot water production and
a domestic hot water cylinder to achieve increased hot
water convenience.
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.
3.2.2 Hot water production with domestic hot
water cylinder (VU boiler)
When you open a hot water tap (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 received the set temperature, the boiler
switches off.
3.2.3 Hot water production with VUW boiler
When you open a hot water tap (sink, shower, bath, etc.),
the boiler operates automatically and supplies hot water at
a temperature set by you.
When you close the hot water tap. the boiler automatically
stops producing hot water.
If you have activated Comfort mode, the boiler supplies you
with hot water at the requested temperature without you
having to wait for the water to heat up.
i
To prevent unnecessary energy loss, do not set
the temperature higher than is required.