Exiting Diagnostics Mode; Setting The Maximum Flow Temperature; Setting The Burner Anti-Cycling Time; Setting The Partial Heating Load - Vaillant ecoVIT exclusiv Installation And Maintenance Instructions Manual

8.2

Exiting diagnostics mode

▶
Press the i and + buttons simultaneously or wait 4
minutes before pressing any buttons.
◁
The current heating flow temperature or (if this option
has been selected) heating installation filling pressure
will reappear on the display.
8.3

Setting the maximum flow temperature

1. Set the maximum flow temperature for heating mode
under D.71.
2. Set the maximum flow temperature for cylinder charging
mode under D.78.
8.4

Setting the burner anti-cycling time

▶
Set the maximum burner anti-cycling time under D.02.
Note
To prevent frequent switching on and off of
the burner and thus prevent energy losses, an
electronic restart lockout is activated for a spe-
cific period each time the burner is switched
off. The burner anti-cycling time is only active
for the heating mode.
8.5

Setting the partial heating load

▶
Set the partial heat load under D.00.
Note
If the diagnostics code is at the maximum
value, the partial load is continuously optim-
ised by the automatic partial heat load control
based on the current burner load. After an in-
terruption in the mains voltage supply or after
the reset button is pressed, the value that is
currently determined is reset to the maximum
output. If you set a value that is smaller than
the maximum value, the automatic function will
not activate.
8.6

Setting cylinder charging partial load

▶
Set cylinder charging partial load under D.77.
Note
If the diagnostics code is at the maximum
value, the partial load is continuously optim-
ised by the automatic cylinder charging partial
load control based on the current burner load.
After an interruption in the mains voltage sup-
ply or after the reset button is pressed, the
value that is currently determined is reset to
the maximum output. If you set a value that
is smaller than the maximum value, the auto-
matic function will not activate.
0020258610_00 ecoVIT exclusiv Installation and maintenance instructions
Adapting the unit to the installation 8
8.7

Setting the pump overrun and pump mode

You can set the pump overrun under D.01.
You can set the pump overrun for a cylinder charging pump
that is directly connected to the product under D.72.
If the cylinder charging pump is connected to a VRC 630 or
auroMATIC 620 control, set the overrun time on the control.
You can set the Eco (intermittent) or Comfort (continuous)
pump modes under D.18.
In Comfort mode, the external heating pump is switched on
if:
–
The room temperature control requests heat via terminal
3-4-5 and
–
The room temperature control or built-in control specify
a target value for the flow temperature via terminal 7-8-9
that is greater than 30 °C or via eBUS that is greater than
20 °C and
–
The product is in winter mode (the rotary knob for the
heating flow temperature is not at the anti-clockwise end
stop) and
–
The surface-mounted thermostat is closed.
The pump is switched off if:
–
One of the above-mentioned conditions is no longer be-
ing met and
–
The pump overrun has ended.
The burner anti-cycling time has no effect on the pump. If
one of these conditions is missing during the overrun time,
this time ends regardless.
Eco is useful for removing residual heat after domestic hot
water generation when the heat demand is extremely low
and there are large target temperature spreads between the
domestic hot water generation target value and the heating
mode target value. This prevents living rooms from being un-
der-supplied. If there is a heat demand, the pump is switched
on for five minutes within 30 minutes in each case once the
overrun time has elapsed .
If a temperature sensor is connected in the return:
If the return temperature for the heating water drops rapidly,
the pump runs (within those 30 minutes) for longer than the
minimum running time of five minutes. The "intermittent"
operating mode can be interrupted at any time by starting
the burner, and the pump runs in the normal heating mode.
8.8

Start-up behaviour

When there is a heat requirement, the product goes into the
status S.02 (pump prerun) for approx. 15 seconds and then
the fan is started (S.01).
After reaching the start-up speed, the gas valve is opened
and the burner starts (S.04).
The product is now operated at minimum output for 30 to 60
seconds, depending on the boiler temperature. Depending
on the target value deviation, the calculated target speed is
then set.
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