Section 12: Servicing
Page 55
12.4 Flue System
12.4.1 Flue terminal
Failure to maintain a clean flue can result in the emission of
flue gases into the dwelling or damage from potential fire in the
flue.
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Check the flue terminal and ensure that it is not blocked or damaged.
12.4.2 Flue
To access the flue inspection hatch, remove the circular outer cover.
To do this, turn the knob in the centre of the outer cover approximately
one turn anticlockwise and pull the cover away from the inspection
pipe.
Remove the flue inspection hatch. Turn the knurled knob (in the centre
of the hatch) approximately one turn anticlockwise, pull the hatch out
of the flue and inspect the inside of the flue system.
Clean the flue by sweeping as required.
Replace the inspection hatch using the reverse procedure turning the
knurled knob approximately one turn clockwise to secure it in the flue.
Replace the circular outer cover using the reverse procedure, turning
the knob approximately one turn clockwise to secure the cover in
place.
12.4.3 Smoke test
Following inspection and cleaning of the flue system, carry out
a smoke test as specified in The Building Regulations Approved
Document J, Appendix E, Section E15 – Smoke Test II.
12.5 Combustion Ventilation
Check that the combustion air inlet to the boiler along the lower front
edge of the boiler front door is unobstructed. If necessary remove any
obstructions, e.g. leaves, etc.
Check that the combustion air inlet to the burner, located in the font of
the boiler, is unobstructed.
12.6 Boiler
12.6.1 Overheat thermostat and temperature probe
With the hinged hopper lid open and top access cover removed:
Check the following:
•
That both the overheat thermostat probe and thermistor bulb are
fully inserted in the boiler waterway pocket (on the upper left side
of the boiler), and the retaining clip is fitted. Refer to Figure 11-3.
•
The condition of thermistor cable and thermostat capillary, i.e.
not damaged, broken or kinked.
12.6.2 Primary heat exchanger
With the hinged hopper lid open and top access cover removed (as
Section 12.3 above):
•
Shut off the cold water supply to wash system.
•
Disconnect the water supply hose from the wash system. Refer
to Figure 12-2.
Figure 12-2:
Wash system connection
•
Unscrew and remove the five nuts (and washers) securing the
heat exchanger cover and remove it from the top of the heat
exchangers. Refer to Figures 12-3.
Figure 12-3:
Heat exchanger cover
Clean primary heat exchanger as follows:
•
Remove all eight mild steel spiral baffles by lifting them vertically
up and out from the primary heat exchanger tubes. Refer to
Figure 12-4.
Figure 12-4:
Primary heat exchanger spirals
•
Clean down any ash inside tubes, using a suitable pipe brush,
into the combustion chamber and ash pan below.
•
Carefully clean the Lambda sensor - located on the left side in
the top chamber of the primary heat exchanger. Remove any ash
deposits using a soft bristle brush (e.g. a small paint brush) and