17
a)
Check that the gas supply is tur
ned ON and the gas service cock
is OPEN.
b)
Slacken the scr
ew in the gas cock inlet pressure test point and
connect a suitable manometer. Refer to Fig. 20.
c)
T
urn both control knobs fully anticlockwise to the standby position
SSSS
.
d)
Switch on the electrical supply
. The display reads ‘
IIII
’, followed by
the current CH temperature.
e)
T
urn the CH and DHW control knobs to the desired temperature
position and fully open any DHW tap. The fan should start and after
a few seconds ignition will commence.
f)
If the bur
ner fails to light the fan will stop. Initially this may be due
to air in the gas supply line. The boiler will automatically have five
attempts at ignition. It may be necessary to press the reset button and
repeat. (See section 5.5).
g)
When the boiler has lit the display will show the boiler
temperature and the flame light will come on. Check that the gas
supply pressure measured at the appliance inlet pressure test point is
20 ± 1 mbar for natural gas. (See Fig.20).
5.2
COMMISSIONING THE APPLIANCE
Refer to Figur
es 19 & 20
If, at any time during the commissioning procedure, it
is required to prevent the appliance from modulating,
set the CH control knob to the Service position (fully
clockwise).
THIS BOILER IS F
ACTORY SET SO THAT NO
COMBUSTION OR GAS BURNER PRESSURE
CHECKS ARE REQUIRED. HOWEVER, IF THE
APPLIANCE FAILS TO OPERATE CORRECTLY,
REFER TO SECTION 8.5. FAULT FINDING.
IF A COMBUSTION & GAS INLET CHECK IS TO BE CARRIED
OUT, REFER TO SECTION 6.1.
!
If the gas inlet pressure is outside the required value check
that the gas pipe is of the correct diameter or contact the
gas provider to adjust the gas meter governor.
Please note that the appliance incorporates advanced
DICOM (Digitally Controlled Combustion) electronics
which means that there is no requirement for manual gas
valve adjustment or checks. DICOM makes it possible to
control the gas valve completely by the electronic board.
Close the DHW tap and ensur
e that the burner goes out (the display
reads the current CH temperature) and the pump stops after an over-
run period of 2 minutes.
NOTE
: The bur
ner may run on for a few
seconds (keep-hot function - see section 5.8)
h)
Ensur
e that the room thermostat (if fitted) or timeclock is calling for
heat. Turn the clock override switch to the ‘
I
’ position. The ignition
sequence will commence and when flame is detected the display will
show the CH set temperature in °C, the CH demand light will be
lit and the flame light will light.
i)
Set the clock to the desir
ed times by setting the tabs as shown.
j)
Slide the clock over
ride switch to the ‘timed’ position and check
the operation of the clock and room thermostat (if fitted).
19
20
