Deactivating The Storage Tank Mode; Drawing Off The Hot Water; Setting For The Heating Mode; Setting The Flow Temperature (No Controller Connected) - Vaillant ecoTEC SERIES Operating Manual

4 Operation

4.4.2 Deactivating the storage tank mode

In VU units connected to domestic hot water cylinders
you can deactivate the hot water generation or recharg-
ing operation whilst keeping the heating system in
operation.
• Turn the rotary knob for setting the hot water tem-
perature all the way to the left. Only the frost protec-
tion function for the cylinder remains active.

4.4.3 Drawing off the hot water

1
4.7 Drawing off hot water
Hot water is drawn from the connected cylinder when a
hot water tap (1) is opened at a draw-off point (washba-
sin, shower, bathtub, etc.)
If the storage temperature falls below the set tempera-
ture, the VU unit starts up automatically and reheats
the cylinder. The VU unit switches off automatically
when the cylinder reaches the set target temperature.
The pump continues to run for a short while.
12
4.5

Setting for the heating mode

4.5.1 Setting the flow temperature (no controller
connected)
2
1
Fig. 4.8 Setting the flow temperature without a controller
If there is no external controller, set the flow tempera-
ture using the knob (1) according to the outside temper-
ature. We recommend the following settings:
– Left position (but not all the way) in spring and au-
tumn: Outside temperature approx. 10 to 20 °C
– Mid-position setting in reasonably cold weather:
Outside temperature approx. 0 to 10 °C
– Right position in very cold weather:
Outside temperature approx. 0 to –15 °C
When you adjust the temperature, the value specified is
shown in the display (2). This display disappears after
3 seconds and is replaced by the standard display
(current heating feed temperature or water pressure in
the system (optional)).
The settings at the rotary knob (1) are normally infinite-
ly variable up to a feed temperature of 75 °C. However,
if higher temperatures can be set on your appliance,
have your engineer make adjustments so that you can
operate the heating system at higher flow
temperatures.
Operating manual ecoTEC 0020052777_00