Viessmann Vitopend 100-W Installation And Service Instructions For Contractors page 46

Function description
Control and display elements
2
1 3
0 4
bar
A Pressure gauge
B Display
C Rotary selector for DHW tempera-
ture
Heating mode
If the room thermostat issues a demand,
the boiler water temperature is held at
the set temperature selected with rotary
selector "tr".
Note
The boiler water temperature must be
set sufficiently high for the required room
temperature to be reached.
DHW heating
Gas system boiler
If the cylinder temperature drops 2.5 K
below the set cylinder temperature, the
burner and circulation pump start and the
3-way valve changes over to DHW heat-
ing.
46
D Rotary selector for heating water
temperature
E ON/OFF switch
If there is no demand, the boiler water
temperature is held at the default frost
protection temperature.
The boiler water temperature is limited
by the electronic temperature limiter
inside the burner control unit to 84 °C.
Flow temperature setting range: 40 to
76 °C.
The set boiler water temperature is up to
20 K higher than the set cylinder tem-
perature. If the actual cylinder tempera-
ture exceeds the set cylinder tempera-
ture by 2.5 K, the burner shuts down and
the circulation pump run-on time
begins.