6 720 610 576 GB (02.05)
Maintenance
35
B
Loosen any deposits in the heat exchanger from top
to bottom using the cleaning blade. Refer to fig. 51.
Fig. 51
B
Clean the heat exchanger from top to bottom using
the brush. Refer to fig. 52.
Fig. 52
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. 53
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. 54.
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. 54
B
Remove burner and clean components. Do not use a
wire brush. Refer to fig. 55.
Fig. 55
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
O
H
2
1.
2.
6 720 610 332-75.1R
1.
2.
4.
7 181 465 330-04.1R
3.
7 181 465 330-08.1R
