Bedienungsanleitung Vaillant ecoTEC plus 937 (Seite 8 von 16) (Englisch)

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Operating instructions ecoTEC plus 937 / 0020031573_028

When you switch the unit on the display (2) shows the

current heating feed temperature.

To adjust the appliance according to your requirements,

read sections 4.4, and 4.6, which describe the setting

options for hot water supply and heating.

Caution!

Risk of damage!

The frost protection and monitoring systems

are only active when the main switch of the ap-

pliance is in the "I” position and it is not dis-

connected from the mains power supply.

To ensure that these protection devices remain active,

switch your gas wall boiler on and off using the controller

(see the corresponding operating manual). Section 4.9 de-

scribes how to put your gas wall boiler out of operation.

4.4 Domestic hot water operation

The boiler can only be used if the heating system has

water in it (see Section 4.2.2).

4.4.1 Setting the hot water temperature

Fig. 4.6 Setting the water temperature

• Switch on the appliance as described in section 4.3.

• Turn the knob (1) for setting the hot water temperatu-

re to the temperature you require.

• In order to increase the temperature turn the knob in

a clockwise direction, and to reduce the temperature

turn the knob in an anticlockwise direction. In doing

this:

- left-hand stop approx. 35 °C

- right-hand stop max. 65 °C

Note

This knob is used to set the maximum hot

water temperature. If turning the knob all the

way to the right has no effect on the tempera-

ture then the hot water preparation system is

running at full output for the selected through-

put.

The set value is shown in the display during the setting

process (2).

After approx. 3 seconds the display returns to standard

mode (the current heating flow temperature).

Caution!

If you live in an area with hard water, please do

not turn the knob (1) further than the mid-posi-

tion (12 o'clock position) to prevent excessive

scale build up.

Danger!

Health danger from formation of Legionella!

If the unit is used to provide heat support in a

solar-supported drinking water heating installa-

tion the hot water draw-off temperature must

be set to at least 60 °C using the knob (1).

4.4.2 Switching on/off the warmstart function

The warmstart function of the ecoTEC combination boiler

immediately provides hot water at the required tempera-

ture without having to wait for it to heat up. To do this, the

hot water heat exchanger of the ecoTEC is kept at a pre-

selected temperature level. This level is maintained by the

hot water preparation system switching on at intervals.

Fig. 4.7 Switching on/off the warmstart function

• The warmstart function is activated by turning the

knob (1) in a clockwise direction to the end stop briefly

(setting a).

The "

" symbol is displayed.

• Then select the desired hot water draw-off temperatu-

re e.g. setting b, see Section 4.4.1.

The unit automatically matches the warmstart tempera-

ture to the set hot water temperature. The heated water

is then immediately available when you draw it off.

The "

" symbol is displayed.

• The warmstart function is de-activated by turning the

knob (1) in an anti-clockwise direction to the end stop

briefly (setting c).

The symbol "

"disappears.

• Then select the required hot water outlet tempera-

ture again, e.g. setting b.

4 Operation

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