Cleaning The Dhw Filters; Cleaning The Heat Exchanger; Re-Assembly - IDEAL istor HE260 Installation And Servicing

60 CLEANING THE DHW FILTERS

The DHW inlet filter is fitted within the Pressure Reducing
Valve, which is fitted externally to the appliance on the DHW
inlet pipe.
1. Close the cold water stop cock to the property or isolate the
PRV using the isolation valves if fitted.
2. Undo the PRV cartridge and remove the assembly from the
brass body.
2

61 CLEANING THE HEAT EXCHANGER

1. Remove ignition and flame detection electrodes. Refer to
Frames 69 & 70.
2. Remove the 3 screws retaining the sump cover and
remove.
3. Using a suitable tool as supplied in the standard
British Gas Flue brush kit, clean between the heat
exchanger fins from the top of the heat exchanger.
4. Access to the base of the heat exchanger is now
possible. Brush clean any deposits from the base of the
heat exchanger and remove any loose deposits from the
sump.
5. Inspect the ignition and detection electrodes. Ensure that
they are clean and in good condition - replace if
necessary.
6. Check the condition of the combustion chamber
insulation. Any cracked or damaged pieces must be
replaced.
Note. Take care not to disturb the ionisation probes at the
front and rear of the combustion chamber.
7. Check that the ignition and detection gaps are correct.

62 RE-ASSEMBLY

Re-assemble the boiler in the following order:
1. Refit the condensate trap.
2. Refit the sump cover.
3. Refit the electrodes. (Check dimensions, see Frames 69
& 70).
4. Refit the burner, renewing any damaged or deteriorating
sealing gaskets.
48
SERVICING
3. Remove the filter from the cartridge body and clean.
4. Re-assemble in reverse order and re-open the cold water
stop cock.
3
Sump cover
2
5. Refit the fan / venturi assembly.
6. Reconnect the fan electrical lead.
7. Refit the boiler sealing panel.
IMPORTANT.
Ensure that the boiler sealing panel is correctly fitted and
that a good seal is made.
8. Turn on the gas supply at the gas service cock.
9. Reconnect the electrical supply.
istor system store -
3
Ionisation
probes
Heat exchanger
Installation and Servicing