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
Frost protection function
The frost protection is generally active
when the boiler is in 'Stand-by' mode.
G
F
E
D
C
B
5 0 -5 -10 -15 -20
If the boiler temperature is less than 8C
the circulating pump is ON and at a boiler
temperature of 12C the pump is OFF.
The burner will be switched on at a boiler
temperature of 5°C and switched off at
15°C.
A

Control unit

39