Control Unit; Functions And Operating Conditions In Weather-Compensated Mode - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Functions and operating conditions in weather-compensated mode

In weather-compensated mode, the
boiler water temperature is regulated
subject to the outside temperature.
Heating curve of weather-compensated control unit
90
80
70
60
50
40
30
20
10
0
20 15 10
Outside temperature in °C
Rotary selector setting "tr"
A = 1
B = 2
C = 3
D = 4
E = delivered condition
F = 5
G = 6
Note
Y-plan and S-plan systems cannot be
operated in weather-compensated
mode.
For further information, see separate ter-
minal box cylinder demand (accessory)
installation instructions.
G
F
E
D
C
B
5 0 -5 -10 -15 -20
Frost protection function
Frost protection function is only possible
when an outside temperature sensor is
connected.
At an outside temperature < 5°C, the
frost protection function is enabled. The
burner is switched on and the boiler
water temperature is held at 20 °C.
A

Control unit

47