Cleaning The Condensate Trap - Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

10 Inspection and maintenance
10.3.2 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 trap.
10.3.3 Checking the burner
1
2
3
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.
32
10.3.4 Installing the compact thermal module
1 2
3
4
5
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 line.
4. Reconnect the plug (6) to the gas valve.
5. Reconnect the plug (7) to the fan motor.
6. Connect the gas line 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 21)
10.4

Cleaning the condensate trap

1. Remove the lower section from the condensate trap.
2. Flush out the lower section with water.
3. Fill the lower section with water up to about 10 mm be-
low the upper edge.
4. Attach the lower section to the condensate trap.
Installation and maintenance instructions ecoTEC exclusive 0020193966_01
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