Position of the gas shut-off valve for
Vitodens 333
1.
Check the heating system pressure
on the pressure gauge
A
: The sys-
tem pressure is too low if the nee-
dle indicates below 0.8 bar. In that
case, top up with water or contact
your local heating contractor.
2. For open flue operation:
The combustion air is drawn from
the boiler room.
Check whether the ventilation/
exhaust apertures in the boiler
room are open and unobstructed.
3.
Open the gas shut-off valve
B
.
4.
Switch ON the mains power supply;
e.g. at a separate fuse or a mains
electrical isolator.
5.
ON/OFF switch "
8
"
C
;
standby mode is then shown to be
running by the green indicator (ON
indicator); after a short time the boi-
ler temperature will be displayed.
Your heating system and, if
installed, your remote control unit
are now ready for use.
Heating system shutdown
If you temporarily have no need of your heating system, e.g. during a summer
holiday, switch the system to "
standby mode
"
K
(see page 12).
Note
The circulation pump will be started for short periods at regular intervals to pre-
vent it from seizing up. These intervals can be modified by your heating contrac-
tor.
Heating system start-up
10
Start-up and shutdown
55
92
453
GB
