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Fig.19 . Burner body.
Fan Connector
Mixing Tube
Air Flow Tube
Fig. 20. Burner plate position.
Heat Exchanger
Body
Flame Sense
Gas
Electrode
Front of Appliance
seal
7mm
Burner Flame
Strip
Fan Assembly
Sight Glass
Remove the cabinet . Refer to Fig. 12.
Check that the condensate trap and syphon are clear and clean,
if necessary, by draining and refilling. Remove the yellow cap at
the base of the siphon to drain. See Fig. 30.
Ensure that the system is full, vented and pressurised.
Check the inlet gas pressure and the maximum heat input. Refer
to Table 1 and Section 7. If the gas rate has dropped by more
than 5% from the specified figure then check the combustion
performance of the appliance.
Connect a combustion test meter (to read CO
on the flue turret and operate the appliance at maximum input
for 10 minutes. See Section 11. A CO
0.3% should be achieved.
If the figures for the gas rate and the CO
then it will be necessary for the appliance flueways to be
cleaned.
Turn off the gas and electricity supplies. Remove the inner casing
cover. Release the fan assembly by unscrewing the two extended
screws. Unscrew the rear fixing screw, remove the split pins and
unscrew and remove the front fixings. Remove burner casing. Lift
out the burner skin and seal. Refer to Fig.20.
Lightly brush the exposed flueways.
Remove the yellow siphon trap drain plug and the grey
condensate drain cap. Refer to Fig.31. Pour clean water through
the heat exchanger and into the condensate trap drain until the
water coming from the heat exchanger is clear.
Replace the cap and plug.
Refill the siphon.
When replacing the burner flame strip do not forget the new
gasket. Refit the fan assembly in the reverse order. Refer to
Fig.20. Tighten the nuts evenly by hand plus sufficient extra
force to allow the fitting of new split pins. Tighten the rear
fixing - do not over tighten.
23
Fan Assembly
Fixing Screws
Burner Body
Fixing Screw
Burner Body
Split
Pin
Burner Body
Fixing
Spark
Electrode
Assembly
%)to the test point
2
reading of about 8.7 +/-
2
are not satisfactory
2
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