Functions And Operating Conditions In Weather-Compensated Mode; Heating Mode; Dhw Heating - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Control unit

Functions and operating conditions in weather-compensated mode

Heating mode

In weather-compensated mode, the boiler water tem-
perature is regulated subject to the outside tempera-
ture.
Heating curve for weather-compensated control
90
80
70
60
50
40
30
20
20 15 10
Outside temperature in °C
Fig. 56
Code for selected heating curve
X
The setting can be made in increments of - - to 35.
Set heating curve
1. Tap / .
The set parameter flashes and
played.
2. Use / to select the parameter.
3. OK to confirm.

DHW heating

Heating the DHW loading cylinder from cold
The heating circuit pump is switched ON and the 3-
way diverter valve will be changed over, if the cylinder
temperature sensor captures a temperature lower than
the defaulted set value.
■ The cylinder loading pump is switched ON if the
boiler water temperature
■ The burner is switched ON if the boiler water temper-
ature set cylinder temperature, and the cylinder
≤
loading pump is switched ON when the required
boiler water temperature is reached.
68
eT eP
-5
5 0
will be dis-
set cylinder temperature.
≥
wT
wP
qT
qP
5
-10 -15
Frost protection function
The frost protection function requires an outside tem-
perature sensor to be connected. Frost protection
function is active at outside temperatures of < 5 °C.
The burner starts and the boiler water temperature is
held at 20 °C.
The loading cylinder is heated up to the set cylinder
temperature. Heating stops when the specified temper-
ature has been reached at the cylinder temperature
sensor.
After loading has stopped, the cylinder loading pump
and the 3-way diverter valve remain on for a further
30 s.
Reheating when DHW is drawn off
When DHW is drawn off, cold water enters the lower
section of the loading cylinder.