Control Unit; Functions And Operating Conditions In Weather-Compensated Mode - 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 temperature is regulated
subject to the outside temperature.
Heating curve for weather-compensated control
90
80
70
60
50
40
30
20
10
0
20 15
Outside temperature in °C
Setting of rotary selector "tr"
A = 1
B = 2
C = 3
D = 4
E = delivered condition
F = 5
G = 6
70
G
F
E
10 5 0 -5 -10 -15 -20
D
C
B
A
Frost protection function
The frost protection function requires an
outside temperature sensor to be con-
nected. Frost protection function is
active at outside temperatures of < 5°C.
The burner starts and the boiler water
temperature is held at 20 °C.