Technical data

INSTALLATION & SERVICING INSTRUCTIONS
Page 17
7.0 INITIAL LIGHTING
See
Figure 12
a Check that the electricity supply and gas service cock are OFF.
b Remove the screw from the gas control valve inlet pressure test point.
c Turn on the gas supply and open the gas service cock to purge air from the appliance supply pipe.
d Replace the gas control valve inlet pressure test point screw and allow the purged gas to disperse.
e Check that the gas control knob is turned fully clockwise to the OFF position
and that the boiler
thermostat knob is turned fully anti-clockwise to the OFF position.
f Remove the burner pressure test screw and connect a pressure gauge.
g Turn qas control knob anti-clockwise to the PILOT position
, push in and hold it depressed.Push
in and release the piezo igniter button repeatedly until the pilot flame can be seen through the sight
window. When the pilot has lit, continue to press in the gas control knob for a further fifteen seconds,
then release. The pilot should stay alight.
h SHOULD THE PILOT GO OUT AT THIS OR ANY OTHER STAGE, TURN GAS CONTROL KNOB
CLOCKWISE TO THE OFF POSITION
AND WAIT FOR THREE MINUTES. Then repeat
instruction "g."
i Check that the pilot flame envelopes the thermocouple tip by 6-8mm (see
Figure 14). Refer to the
fault finding section if the pilot flame is not satisfactory. Remove the combustion chamber door (see
Section 9.1.2) and check for gas soundness at the pilot tube nut on the pilot assembly. Replace the
door, ensuring all screws are fully tightened.
j Push in and turn gas control knob anti-clockwise to the ON position(
). Set the boiler thermostat to
Setting 5, and ensure all external controls are calling for heat.
k Switch on the electricity supply and check that the main burner lights smoothly from the pilot. Test for
gas soundness around all boiler gas components using leak detection fluid.
l Allow the boiler to operate for approximately 10 minutes, then check the burner gas pressure. Note
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