Control And Display Elements - Viessmann Vitopend 100-W Installation And Service Instructions Manual

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
The set boiler water temperature adjus-
ted at rotary selector "tr" will be main-
tained when a demand is raised by the
room thermostat.
Note
The heating 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 switch on
and the three-way valve changes over to
DHW heating.
44
D Rotary selector for heating water
temperature
E ON/OFF switch
The boiler water temperature will be
maintained at the default frost protection
temperature when there is no demand.
The electronic temperature limiter inside
the burner control unit limits the boiler
water temperature 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 switches off and
the circulation pump run-on time
begins.