Dhw Heating; Increased Dhw Hygiene - Viessmann Vitodens 200-W B2HE Installation And Service Instructions Manual

Appliance functions
Example
C
60
D
B
50
40
30 30
20
10
A
0
6 7
Time
Fig. 69
Start of operation at standard room temperature or
A
comfort room temperature
B Set flow temperature in accordance with the set
heating curve

DHW heating

The burner, the circulation pump and the 3-way
diverter valve are started or changed over if the cylin-
der temperature lies 2.5 K below the set cylinder tem-
perature.
In the delivered condition, the set boiler water temper-
ature is 20 K higher than the set cylinder temperature.
If the actual cylinder temperature exceeds the set cyl-
inder temperature by 2.5 K, the burner shuts down and
the circulation pump run-on time begins.

Increased DHW hygiene

The DHW can be heated to a specified (higher) set
DHW temperature (approx. 70 °C) for a period of one
hour.
(cont.)
8 9
Set flow temperature in accordance with parame-
C
ter 424.3
D Duration of operation with higher set flow tempera-
ture in accordance with parameter 424.4:
60 min
Danger
Risk of injury due to increased DHW tempera-
ture.
Inform the system user of the risk from the
raised outlet temperature at the draw-off points.
■ Gas condensing system boiler:
If the set DHW temperature is set to over
60 °C
■ Gas condensing combi boiler:
If there are several draw-off events in quick
succession or several appliance calibration
processes
Danger
Risk of injury due to increased DHW tempera-
ture.
Inform the system user of the risk from the
raised outlet temperature at the draw-off points.
If required, provide on-site scald protection
measures.
Function description
113