34
the presence of voltage.The burner
will start.
3.2.2 Boiler stat (fig. 8)
Turn the boiler stat knob to a tempera-
ture no lower than 60°C.
The set temperature value can be
checked on the thermometer.
3.2.3 Safety stat (fig. 9)
The manually reset safety stat trips to
switch-off the burners immediately when
the boiler temperature exceeds 100°C.
To restart the boiler, unscrew the black
cover and press the button underneath.
If the problem occurs frequently, call an
authorised technical assistance centre
for the necessary checks to be carried
out.
3.2.4 System filling
Periodically check the pressure values
of the hydrometer mounted onto the
system, when the system is cold, should
range between 1 and 1.2 bar (98 and
117.6 kPa).
If the pressure is less than 1 bar (98 kPa),
reset the system.
3.2.5 Turnig OFF boiler (fig. 7)
To temporarily turn off the boiler turn
off the electricity supply by pressing the
main switch.
The following operations must be carried
out if the plant will not be in use for a
lengthy period of time:
– position the main switch of the plant on off;
– turn the fuel and water taps of the cen-
tral heating plant off;
– empty the central heating plant if there
is danger of frost:
3.2.6
Second stage modulation
thermostat (fig. 10)
The thermostat (TC2) is factory set at 50°C.
To access calibration, remove the protecti-
ve plug and act with a suitable screwdriver.
The purpose of the thermostat is to switch
the burner to minimum power (second
stage).
3.3
REGULAR CLEANING
Maintenance of the boiler should be
carried out annually by an authorised
service engineer.
Disconnect the boiler from the electri-
cal supply before servicing or mainte-
nance is carried out.
Fig. 8
Fig. 9
60°C
60°C
TC2
Fig. 10
