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• Reassemble the sealed chamber lid and the
front panel of the case (see "Dismantling the
external panels" to page 50).
If the maximum and minimum gas pres-
sures measured above are not in accord-
ance with the technical data (sections
"Technical Data" section pag. 18 or pag.
21) then adjustment will be necessary. A
full explanation of the gas pressure adjust-
ment procedure is given in the Gas Valve
section of the service manual. If maximum
and/or minimum gas pressures are adjust-
ed then the ignition gas pressure must be
checked and adjusted if necessary.
Important: after the gas pressure checks
and any adjustment operations, all of the
test points and adjustment devices must
be sealed. Replace the adjustment protec-
tion cap.
7.8
Checking the burner ignition
• Turn the boiler OFF.
• Open the gas valve outlet pressure test
point 35 (Fig. 7.8) and connect the gauge.
• Turn the boiler ON positioning the control
selectors 7 in the positions as shown in as
in Fig. 7.9 and ensure that the timer selector
switch and room thermostat, if fitted, are set
to "heat demand".
9
Fig. 7.9
- 46 -
COMMISSIONING
• Watch the gauge and check to see if the
ignition pressure registered corresponds to
the values as given in the Technical Data.
Turn off the boiler and reignite it by turning
the function selector 7 to the OFF position
and then back to that indicated in Fig. 7.9.
• Repeat this process two to three times leav-
ing 30 second intervals between each igni-
tion. Check the ignition pressures and visu-
ally check that the burner lights uniformly
and in a controlled manner.
• If the burner ignition is not uniformly con-
trolled then checks should be made to:
- the flue installation and termination;
- that the flue gasket as shown in Fig. 6.5 on
- that the burner and injectors are clean;
- that the boiler is set for the correct gas
• If the ignition pressure recorded is not as in-
dicated in the Technical Data then refer to
section "Ignition gas pressure adjustment"
of the Service Manual for the necessary ad-
justment procedures.
Important: after the gas pressure checks
and any adjustment operations, all of the
test points must be sealed and replace the
adjustment protection cap.
7.9
With the burner on high flame close the gas
cock.
After three ignition attempts (within about
three minutes), the lock-out signal lamp 5on
page 8 must appear.
To reset the boiler press and release the boiler
7
reset button 6on page 8.
page 33 is in place;
used (see "GAS CONVERSION" to page
48).
Checking the ignition device
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