39
Installation and Servicing
Section 3 - Servicing
SER
VICING
3.8 CLEANING THE HEAT EXCHANGER
1. Ensure the condensate trap is fully drained before cleaning.
Refer to Section
3.17
2. Remove ignition/detection electrode.
Refer to Section
3.9
3. Replace the sump cover prior to the water flush process.
4. Thoroughly flush the heat exchanger by pouring water into
the top of the combustion chamber ensuring the full top
area is covered.
5. Remove the sump cover and clean loose deposits from the
sump.
Combined Ignition Detection Electrode
6. Inspect the ignition/detection electrode. Ensure that they
are clean and in good condition - replace if necessary.
7. Re-fit the ignition/detection electrode, ensuring that the
earth tab is fitted to the ignition electrode.
8. Check that the ignition gap is correct.
Refer to Section
3.8
2
3 mm
Straight edge
1. Remove the fan.
Refer to Section
3.7
2. Remove the flue manifold.
3. Remove the burner.
Refer to Section
3.13
4. When servicing the boiler inspect the condition of the
electrode and check the dimensions shown. If there is
damage to the electrode continue to follow steps below
for replacment.
5. Unplug the ignition lead from the electrode.
6. Remove the earth lead from the electrode.
7. Remove the 2 screws holding the
electrode to the combustion chamber.
8. Remove the electrode.
9. Fit the new electrode, using the new
gasket supplied. Check dimensions as
shown.
Refer to Section
2.27
Ignition /Detection
Electrode
Spark Gap
3.5 mm
Refer to Section
3.2
3.9 IGNITION / DETECTION ELECTRODE REPLACEMENT / INSPECTION