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