Ferroli Optima 901 Installation Instructions Manual page 20

8.5 To Light the Boiler (fig. 21)
a. Open controls panel door.
b. Switch on electricity supply.
c. Adjust room thermostat and all external controls to «ON». Check operation of pump.
d. Turn the boiler thermostat to maximum. Fan will run (A waiting time of max 3 minutes before fan will run is
possible!). Wait
e. Depress the gas control knob fully (this should operate the electronic ignitor). When the pilot flame is seen
to light through the pilot viewing window, keep the control knob fully depressed for a further 15 seconds, then
release.
Should the pilot fail to remain alight (or goes out on any other occasion i.e. if electricity supply
as been
turned off) wait 3 minutes and repeat. Should the pilot still fail to remain alight, refer to the fault finding
section.
f. With the pilot burner established, observe that the main burners cross-light smoothly.
g. Temporarily turn off by switching off electricity supply.
Important Note: If the burner stops for C.H. only after a waiting time of 3 minutes will the boiler will light again!
20
Gas valve
control knob
C.H./D.H.W. selector switch
20 seconds after fan starts to run at full speed.
901
Pilot viewing
opening
C.H. pressure gauge
C.H. boiler
thermostat
AUTO P
AUTO
12: 31
4
x
x
OVERR IDE
+ -
P
R
Time clock
fig. 21