Viessmann VITOTRONIC 300 Operating Instructions Manual page 34

DHW heating
Time program
Further information can be found in chapter
"Terminology" in the Appendix.
Setting a time program
Factory setting: "Automatic"
During operation with standard room temperature,
DHW in the DHW cylinder is heated to the set DHW
temperature (see page 33).
The time phase for DHW heating automatically starts
half an hour earlier than the time phase for central
heating with standard room temperature. DHW heating
will start, for example, at 05:30 h if the start time for
central heating is 06:00 h. This means hot water is
already available when your system starts operating at
standard room temperature.
You can change this time program individually in
accordance with your requirements.
Tap the following buttons:
1. "Menu"
2. "DHW"
Increased DHW hygiene
This function can be used to heat the water in the
DHW cylinder to a higher set DHW temperature.
Your heating contractor can enable this function by
specifying a second set DHW temperature.
Set time phase 4 for this. During this time, DHW will be
heated to the second set DHW temperature value.
DHW heating once, outside the time program
Note
The operating program "Heating and DHW" or "DHW
only" must be set for at least one system heating cir-
cuit.
Setting the time program for the DHW circulation pump
Factory setting: "Automatic"
The DHW circulation pump operates in parallel to the
DHW heating time program.
You can change this time program individually in
accordance with your requirements.
Tap the following buttons:
1. "Menu"
2. "DHW"
34
3. "Time prog DHW"
4. "Individual"
5. Press OK to confirm
For how to set a time program, see page 19.
Note
■ The DHW is not heated between the time phases.
Frost protection for the DHW cylinder is active.
When setting time programs, bear in mind that your
■
heating system requires some time to heat the DHW
cylinder to the required temperature.
■ Any started water heating process continues until the
set DHW temperature is reached, even if the stop
time has been reached.
Note
A start and stop time must be set for the 2nd and 3rd
time phase.
Enable "Comfort mode" (see page 25 or 30) and
immediately disable it again. This prevents unintention-
ally running the central heating at standard room tem-
perature.
3. "DHW circulation time program"
4. "Individual"
5. Press OK to confirm
For how to set a time program, see page 19.
Note
The DHW circulation pump remains off between the
time phases.