Installation Manual

29
Constant temperature control unit
Control and display elements
Heating mode
The selected set boiler water temperature
will be maintained when a demand is
created by the room thermostat and the
heating programme is set to DHW and
central heating . The boiler water
temperature will be maintained at the
default frost protection temperature when
there is no demand.
The boiler water temperature will be
limited:
To 74ºC by the control thermostat
inside the burner control unit.
To 82ºC by the electronic temperature
limiter inside the burner control unit.
To 100ºC by the temperature limiter in
the safety chain (interlocks the burner
control unit).
Pressure gauge
A
Fault display (red)
B
ON indicator (green)
C
Reset button
D
User interface
E
ON/OFF switch
F
5350 485 GB 08/2007
Vitoden 200-W installation 4/9/07 7:27 pm Page 29