6 720 610 576 GB (03.02)
Maintenance
35
B Loosen any deposits in the heat exchanger from top
to bottom using the cleaning blade. Refer to fig. 52.
Fig. 52
B Clean the heat exchanger from top to bottom using
the brush. Refer to fig. 53.
Fig. 53
B Remove the fan and the burner (see section headed
“Burner”) and flush the heat exchanger from the top.
B Clean out the condensate collector and trap connec-
tion (with other end of brush).
Fig. 54
B Refit the clean-out cover using a new seal and
tighten screws to torque of approx. 5 Nm.
Burner
B Check that the gas cock is turned off and the master
switch is in the OFF position.
B Remove the clips (1) and unscrew the two bolts (2).
Refer to fig. 55.
B Unscrew and remove the two hexagon screws secur-
ing the fan (3).
B Slacken fully the rear securing bolt (4).
B Remove the burner coverplate.
Fig. 55
B Remove burner and clean components. Do not use a
wire brush. Refer to fig. 56.
Fig. 56
B Re-assemble burner in reverse order using a new
seal.
B Adjust gas/air ratio. Refer to section 7.2.
6 720 610 332-73.1R
6 720 610 332-74.1R
6 720 610 332-75.2R
1.
2.
4.
7 181 465 330-04.1R
3.
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