11 Inspection and maintenance
30
Installation and maintenance instructions ecoTEC exclusive 0020186710_06
11.3.2 Cleaning the heat exchanger
1.
Protect the folded down electronics box against sprayed
water.
1
2
3
4
2.
Never undo the four nuts on the stud bolt
(1)
or tighten
them.
3.
Clean the heating coil
(3)
of the heat exchanger
(4)
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
(2)
on the back of the heat ex-
changer.
◁
The water flows out of the heat exchanger through
the condensate siphon.
11.3.3 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.
11.3.4 Installing the compact thermal module
1
3
2
4
5
7
6
1.
Connect the compact thermal module
(5)
to the heat
exchanger
(4)
.
2.
Tighten the four nuts
(1)
in a cross-wise pattern until the
burner flange fits closely and uniformly onto the mating
surfaces.
–
Tightening torque: 6 Nm
3.
Reconnect the plug
(2)
for the ignition line and the plug
(3)
for the earth wire.
4.
Reconnect the plug
(6)
to the gas valve assembly.
5.
Reconnect the plug
(7)
to the fan motor.
6.
Connect the gas pipe using a new seal. In the process,
secure the gas pipe against twisting.
7.
Open the gas isolator cock.
8.
Make sure that there are no leaks.
9.
Check that the sealing ring in the air intake pipe is posi-
tioned correctly in the seal seat.
10. Reconnect the air intake pipe to the intake nozzle.
11. Secure the air intake pipe with the retaining screw.
12. Check the gas flow pressure. (
→
Page 20)
11.4
Cleaning the condensate siphon
1.
Remove the lower section of the siphon.
2.
Flush out the lower section of the siphon with water.
3.
Fill the lower section of the siphon with water up to
about 10 mm below the upper edge.
4.
Re-fit the lower section of the siphon onto the condens-
ate siphon.
