Functional description
Installation instructions VRC 470 0020116690_00
33
8
8.5
System configuration: Domestic hot water
8.5.1
Setting the target temperature for domestic
hot water (desired hot water temperature)
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Cylinder temp. target
This function allows you to define the target tempera-
ture for a connected domestic hot water cylinder
("desired hot water temperature").
To do this, the temperature for the domestic hot water
cylinder must be set to the maximum value in the heat
generator.
You must select the temperature in such a way that the
heat requirement of the operator is just covered.
8.5.2 Reading the current temperature of the
domestic hot water cylinder
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Cyl. temp. current
This function allows you to read the current measured
value of the SP1 cylinder sensor.
8.5.3 Reading the status of the cylinder charge
pump
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Cylinder charge pump
This function allows you to read the status of the cylin-
der charge pump (On, Off).
8.5.4 Reading the status of the circulation pump
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Circulation pump
This function allows you to read the status of the circu-
lation pump (On, Off).
8.5.5 Defining the day for executing the anti-
Legionella function
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Anti-legionella day
With this function, you can define a day or a block of
days for execution of the anti-Legionella function.
When the anti-Legionella function is enabled, 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. To this end the value of the
target cylinder temperature is automatically raised to
70 °C (with 5 K hysteresis). The circulation pump is acti-
vated.
The function is terminated automatically when the cylin-
der sensor SP1 measures a temperature of
60 °C for
more 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 no anti-Legionella function
(due to risk of scalding)!
If "Days away from home" have been planned, the anti-
Legionella function is not active during these days. It
is activated directly on the first day after the "Days
away from home" have elapsed and is executed on the
defined weekday/block of days at the defined time
(
¬
Section 8.5.6)
.
Example:
The anti-Legionella function should be executed weekly
on Tuesday at 08:00 a.m. The planned "Days away from
home" end on Sunday at 24:00 hours. The anti-
Legionella function is activated on Monday at 00:00
hours and executed on Tuesday at 08:00 hours.
8.5.6
Defining the time for executing the anti-
Legionella function
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Anti-legionella time
With this function, you can define the time for executing
the anti-Legionella function.
When the time is reached on the defined day or block of
days, the function starts automatically if "Days away
from home" (holidays) are not planned.
8.5.7 Defining the offset for charging the domestic
hot water cylinder
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Cylinder boost offset
Only with a connected VR 61/2 or VR 68/2
With this function, you can define an offset value ( K) for
the desired hot water temperature. The domestic hot
water cylinder is then charged with the temperature that
results from the total of the desired hot water tempera-
ture and this offset value.
8.5.8 Defining the run-on time for the cylinder
charge pump
Menu ¬ Installer level ¬ System configuration
[Domestic hot water ----] ¬ Load pump
With this function, you can define a run-on time for the
cylinder charge pump. The high flow temperature
required for cylinder charging continues to be delivered
to the cylinder as far as possible by means of the load-
pump overrun before the heating circuits, the generator
circuit in particular, are enabled again.
