Operating and display functions 8
15
–
You can use this function to define whether the Anti-le-
gionella function is carried out daily or on a specific day.
When the Anti-legionella function is activated, the respective
cylinder and the corresponding hot water pipes are heated
up to a temperature of over 60 °C on the set day or block of
days. For this, the value of the target cylinder temperature
is automatically raised to 70 °C (with 5 K hysteresis). The
circulation pump is activated.
The function is terminated automatically when the cylinder
temperature sensor measures a temperature of > 60 °C for
longer than 60 minutes or after a period of 120 minutes has
elapsed (to avoid getting "stuck" in this function if water is
drawn simultaneously).
Factory setting =
Off
means there is no Anti-legionella func-
tion.
If
Days away from home
are scheduled, the Anti-legionella
function is not active during these days. It is activated dir-
ectly on the first day after the
Day Away
have elapsed and
is carried out on the defined weekday/block of days at the
defined Time (
→
Page 15).
If a heat pump is installed in the heating system, the control-
ler activates the auxiliary heater for the Anti-legionella func-
tion.
8.8.8
Defining the time for the Anti-legionella
function
Menu
→
Installer level
→
System configuration
[
Domestic
hot water
----]
→
Anti-legionella time
–
You can use this function to define the time for executing
the Anti-legionella function.
When the time is reached on the defined day, the function
starts automatically if "
Day Away
" (holidays) are not
planned.
8.8.9
Setting the hysteresis for cylinder charging
Menu
→
Installer level
→
System configuration
[
Domestic
hot water
----]
→
Cyl. boost hysteresis
–
If a heat pump is connected, you can use this function to
set a hysteresis for the cylinder charging.
For example: If the desired temperature is set to 55 °C and
the temperature difference for cylinder charging is set to 10
K, cylinder charging begins as soon as the cylinder temper-
ature drops to 45 °C.
8.8.10 Defining the offset for charging the
domestic hot water cylinder
Menu
→
Installer level
→
System configuration
[
Domestic
hot water
----]
→
Cylinder boost offset
–
If a heat pump is connected, you can use this function to
specify an offset value (K) for the
desired temperature
of the
hot water
. The domestic hot water cylinder is then
charged to the flow temperature, which equates to the
total of the
Desired temperature Hot water
and this
offset value.
8.8.11 Setting the maximum cylinder charging
time
Menu
→
Installer level
→
System configuration
[
Domestic
hot water
----]
→
Max. cyl. charg. time
–
If a heat pump is connected, you can use this function
to set the maximum charge time for which the cylinder is
charged without interruption.
The
Off
setting means that there is no time limit for the cylin-
der charge time.
8.8.12 Setting the anti-cycling time for the hot
water demand
Menu
→
Installer level
→
System configuration
[
Domestic
hot water
----]
→
DHW req. anti-cy time
–
If a heat pump is connected, you can use this function to
set a time period in which cylinder charging is blocked.
If the maximum cylinder charging time is reached but the do-
mestic hot water cylinder connected has not yet reached its
set target temperature, the
DHW req. anti-cy time
function
takes effect.
8.8.13 Defining the run-on time for the cylinder
charging pump
Menu
→
Installer level
→
System configuration
[
Domestic
hot water
----]
→
Ch. pump overrun time
–
You can use this function to define a run-on time for the
cylinder charging pump. The high flow temperature re-
quired for cylinder charging continues to be delivered to
the cylinder as far as possible by means of the charge
pump overrun before the heating circuits (in particular,
the burner circuit) are enabled again for the heating func-
tion.
When cylinder charging ends (
desired temperature
of the
hot water
reached), the controller switches the heat gen-
erator off. The run-on time for the cylinder charging pump
starts. The controller automatically deactivates the cylinder
charge pump after the run-on time has elapsed.
8.8.14 Activating parallel cylinder charging
(domestic hot water cylinder and mixer
circuit)
Menu
→
Installer level
→
System configuration
[
Domestic
hot water
----]
→
Parallel cyl. charging
–
You can use this function to define, for the connected
mixer circuit, that the mixer circuit should continue to be
heated during charging of the domestic hot water cylin-
der.
When the function
Parallel cyl. charging
is enabled, the
mixer circuit continues to be supplied while the cylinder is
being charged. Provided there is a heat demand in the mixer
circuit, the controller does not deactivate the heating pump
in the mixer circuit. The non-mixed heating circuit is always
switched off during cylinder charging.
0020200781_01
VR
C
700/2
Installation instructions
