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justment procedure is given in the Gas
Valve section of the service manual. If
maximum and/or minimum gas pres-
sures are adjusted 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 pro-
tection cap.
7.9
Checking the burner ignition
• Turn the boiler OFF.
• Open the gas valve outlet pressure test
point 32 (Fig. 7.8) and connect the gauge.
• Turn the boiler ON positioning the control
selectors 8 in the positions as shown in as
in Fig. 7.9 and ensure that the timer selec-
tor switch and room thermostat, if fitted,
are set to "heat demand".
10
Fig. 7.9
• 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 8 to the OFF
position and then back to that indicated in
Fig. 7.9.
• Repeat this process two to three times
leaving 30 second intervals between each
ignition. Check the ignition pressures and
visually check that the burner lights uni-
formly and in a controlled manner.
• If the burner ignition is not uniformly con-
COMMISSIONING
trolled then checks should be made to:
- the flue installation and termination.
- that the flue gasket as shown in Fig. 6.5
- that the burner and injectors are clean.
- that the boiler is set for the correct gas
• If the ignition pressure recorded is not as
indicated in the Technical Data then refer
to section "Ignition gas pressure adjust-
ment" of the Service Manual for the nec-
essary adjustment 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.
7.10 Checking the ignition device
With the burner on high flame close the gas
cock.
After three ignition attempts (within about
three minutes), the lock-out signal lamp 6on
page 8 must appear.
To reset the boiler press and release the
boiler reset button 7on page 8.
7.11 Checking the flue system
8
The flue system should be visually checked
for soundness. Check all clamps, gaskets
and fixing are secure and tight.
Ensure that the flue terminal is sited cor-
rectly in accordance with the flue fitting in-
structions and Fig. 5.1 on page 39 of this
manual.
To carry out a combustion check refer to the
instructions given in the section "Combus-
tion analysis check" to page 60.
Reference figures are given in the "Techni-
cal Data" section page 30 of this manual
(Flue gas figures).
on page 45 is in place.
used (see "GAS CONVERSION" to
page 57).
- 55 -
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