0020193968_05 ecoTEC exclusive Installation and maintenance instructions
37
1
2
3
5.
Unscrew the retaining screw
(2)
and remove the air
intake pipe
(1)
from the intake stub.
6.
Unscrew the cap nut from the gas valve
(3)
.
1
2
3
7
5
6
4
7.
Remove the ignition line plug
(6)
and the earth line plug
(5)
from the ignition electrode.
8.
Remove all plugs from the fan motor
(3)
by pushing in
the latching lug.
9.
Remove the two plugs from the gas valve
(4)
.
10.
Unscrew the four nuts
(7)
.
11.
Remove the entire compact thermal module
(2)
from
the heat exchanger
(1)
.
12.
Check the burner and the heat exchanger for damage
and dirt.
13.
If necessary, clean or replace the components accord-
ing to the following sections.
14.
Fit a new burner flange seal.
15.
Check the insulating mat on the burner flange and on
the back wall of the heat exchanger. If you notice any
signs of damage, replace the relevant insulating mat.
12.8.2 Cleaning the heat exchanger
1.
Protect the folded down electronics box against
sprayed water.
1
2
3
2.
Never undo the four nuts on the stud bolt
(1)
or tighten
them.
3.
Clean the heating coil
(2)
of the heat exchanger
(3)
us-
ing water or, if required, vinegar (to a maximum of 5%
acid). Allow the vinegar to act on the heat exchanger
for 20 minutes.
4.
Rinse away any loose dirt with a sharp jet of water or
use a plastic brush. Do not point the water jet directly
at the insulating mat on the rear of the heat exchanger.
◁
The water flows out of the heat exchanger through
the condensate trap.
12.8.3 Checking the burner
2
3
1
1.
Check the surface of the burner
(1)
for damage. If you
see any damage, replace the burner.
2.
Fit a new burner flange seal
(3)
.
3.
Check the insulating mat
(2)
on the burner flange. If
you notice any signs of damage, replace the insulating
mat.
