Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 45

3. Use a plastic brush or sufficiently strong jet of water to
remove the loosened dirt. In doing so, ensure that no
spraying water reaches the other components. Do not
point the jet of water directly at the insulating mat (3)
on the back of the heat exchanger.
◁
The water flows via the condensate siphon and out
of the heat exchanger.
4. Check the insulating mat on the heat exchanger for
damage.
▽
Insulating mat is damaged:
▶
Replace the insulating mat.
12.7.4 Checking the burner
1. Check the surface of the burner (1) for damage. If you
see any damage, replace the burner.
2. Check the burner's insulation (2). If required, replace
the burner's insulation.
3. Fit a new burner flange seal (3).
12.7.5 Installing the compact thermal module
5
4 3
2
1. Fit the compact thermal module (8) onto the heat ex-
changer.
2. Attach the fixing tab (7) for the air intake pipe.
3. Tighten the four new nuts (6) across the diagonal until
the burner flange fits closely and uniformly onto the
mating surfaces.
0020261389_03 ecoTEC plus Installation and maintenance instructions
1
2
3
6
7
8
1
–
Tightening torque: 6 Nm
4. Reconnect the plugs (1), (2), (3), (4) and (5).
2
4
5. Connect the gas pipe (4) using a new seal.
6. Open the gas stopcock.
7. Make sure that there are no leaks.
8. Check that the sealing ring in the air intake pipe (3) is
positioned correctly in the seal seat.
9. Reconnect the air intake pipe to the intake stub.
10. Secure the air intake pipe using the retaining screw (2).
11. Reconnect the test system's silicone pipe for checking
the airflow rate (1).
12.7.6 Cleaning the rainwater collector's draining
circuit
A
B
1. Ensure that the rainwater collector is not dirty or
blocked and, if required, clean it.
2. Pour water into the rainwater collector (A).
3
1
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