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SERVICING
36
mini HE --- Installation & Servicing
43 BURNER REMOVAL AND CLEANING
1 Disconnect the electrical supply .
2 Remove outer and inner casing (r efer to frame 42).
3 Undo the screws A and remove the fan holder bracket B
and the co mbust ion chamber panel C.
4 Remove the screws D and the plate E.
C
A
A
B
D
E
5 Disconnect the electrodes leads.
6 Undo the four screws F placed at the right and left sides of
the burner and extract it.
F
7 Brush off any deposits that may have collected on the
burner, ensuring that the flame ports are unobstructed.
Note: brushes with metallic bristles MUST NOT be used.
8 Inspect the spark and detection electrodes. Ensure they
are clean and in good condition; replace if necessary.
9 Check the spark electrodes gap is correct.
4 mm (5/32”)
Ignition
Detection
Male
Female
10 mm
Burner blade
(3/8”)
10 Check that the spark and detection electrodes leads are in
good condition and renew as necess ar y.
44 BURNER PRESSURE CHECK
After any servicing, reference should be made to:
--- Table 2 and Table 3 (or the data plate) which quote details
of the burner pressures.
If the burner pressures are incorrect ensure the inlet pressure,
with the appliance running, is correct (refer Table 1).
If the burner pressures require adjustment refer to frame 35
“To adjust pressures”.
If the appliance still does not operate correctly refer to the
appropriate fault finding char t.
45 CLEANING THE HEAT EXCHANGER
1 Open the combustio n chamber as explained in steps 1 to
3 of frame 43.
2 Place a plastic sheet or similar beneath the heat
exchanger and remove all visible loose deposits from the
heat exchanger fins, using a suitable brush.
4 6 R E --- A S S E M B LY
Re---assemble the boiler in the following order:
3 Refit the burner.
4 Reconnect the electrodes to the electronic p.c.b.. See
frame 43 for correct connectors.
5 Refit the combustion c hamber panel and the fan hol der
bracket and plate E.
6 Refittheinnercasecover.
IMPORTANT. Ensure the boiler s e aling panel is correctl y
fitted and that a good seal is made.
7 Refittheboilersideandfrontpanels.
8 Turn on the gas supply at the gas servic e cock.
9 R econnect the electrical supply.
SERVICING