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Gas orifice
Burner
Burner
manifold
tube
Fig. 18
Installing burner tubes – side view
Burner screw
Fig. 19
Burner tube installed
8.3
Heat exchanger cleaning (see Fig. 20)
While the main burner tubes are removed from the
appliance, the flueway should be cleaned.
a)
Remove the main front panel and the top cover by
pulling upwards to expose the draft hood.
Disconnect wiring to Vitotronic control and remove
sensors from boiler well. Remove the upper front
panel with the Vitotronic control. Be careful not to
kink any capillary tubes or strain any wiring.
b)
Remove the four screws retaining the upper mid
panel and remove the upper mid panel.
c)
Remove all screws fixing the front inspection and
cleaning cover to the draft hood.
Boiler casting
Locating hole
Support pin
Guide
Boiler casting
Fig. 20
Cleaning heat exchanger
d)
Remove the front inspection and cleaning cover to
get access to the heat exchanger.
e)
Remove self tapping screw from lower side rear
panel which is located through rear panel.
f)
Remove lower side rear panel by using the two
finger holes and pulling away from the upper side
rear panel and lifting away from casing frame.
g)
Remove the heat exchanger lower clean-out door
by removing the four brass retaining nuts and lifting
away.
h)
Remove clean-out door gasket to expose flueways.
Remove flue gas baffles (one per flueway).
i)
Repeat e) – h) for opposite side.
Clean flue gas passageway as per Fig. 20 using the
clean-out brush supplied.
8.4
Pilot burner assembly removal (see Figs. 17, 21, 22)
The pilot assembly may be removed either while the
main burners are in the boiler or after the main burners
have been removed, as previously described in
Section 8.2.
Diagonal passes
with brush
Second passes
with brush
15
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