Viessmann Vitopend 100-W Installation And Service Instructions Manual page 84

Control unit
Control and display elements
A
A Display
B MODE key, to call up the menu.
C Arrow keys to scroll through the
menu or set values
Function description
Heating mode
If the room thermostat issues a
demand, the set boiler water tempera-
ture selected at the control unit is main-
tained.
If there is no demand, the boiler water
temperature is held at the default frost
protection temperature.
DHW heating
Gas system boiler
The burner, circulation pump and 3-way
valve are started or changed over if the
cylinder temperature lies 3 K below the
set cylinder temperature.
If the actual cylinder temperature
exceeds the set cylinder temperature
by 3 K, the burner shuts down and the
cylinder loading pump run-on time
begins.
84
B C D
MODE OK
D OK key, to confirm the selection or
E ON/OFF switch
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.
Gas combi boiler
If the flow switch recognises that DHW
is being drawn (> 3 l/min), the burner
and circulation pump are switched on
and the 3-way valve changes over to
DHW heating.
The burner modulates to reach the
DHW outlet temperature and is limited
on the boiler side by the temperature
limiter (84 °C).
E
l
Â
0
save the setting made