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Vaillant ecoTEC plus 937 Manual

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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.
a
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
2
1
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
h
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).
a
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.
d
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.
b
a
b
c
1
1
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
… 8 …


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