Cleaning The Air Separation System; Installing The Compact Thermal Module; Draining The Product - Vaillant ecoTEC plus VU GB 656/4-5 A Installation And Maintenance Instructions Manual

8 Inspection and maintenance
–
Tightening torque: 6 Nm
8.8

Cleaning the air separation system

8.8.1 Cleaning or replacing the filter in the air
separator
1. Unscrew the brass cover (1) on the steel casing (3).
2. Pull the filter (2) up and out.
3. Use hot water to clean the filter, or replace the filter.
4. Insert the filter into the air separator.
5. Screw in the brass cover tightly.
8.8.2 Cleaning the air separator
1
2
3
4
1. Unscrew the nut (4).
2. Unscrew the cap nut (1).
3. Remove the cable harness.
4. Slide the casing (3) forwards and pull the entire air sep-
arator forwards and out.
5. If required, remove the pipe (2).
6. Remove the filter.
7. Use hot water to clean the air separator and the filter.
8. Replace all of the O-rings.
9. Reinstall the air separator.
28
8.9

Installing the compact thermal module

1
2
3
10
1. Connect the compact thermal module (6) to the heat
exchanger (1).
2. Tighten the six nuts (4), including the retainer for the
air intake pipe, in a cross-wise pattern until the burner
flange fits closely and uniformly onto the mating sur-
faces.
3. Check that the blue sealing ring in the air intake pipe is
positioned correctly in the seal seat.
4. Place the air intake pipe (2) on the intake manifold, and
tighten the screw (3).
5. Connect the ignition line and the ground connection to
the ignition electrode (5).
6. Insert the cable (7) from the fan motor, the PWM signal
cable on the underside of the fan (8) and the cable to
the gas valve (10).
7. Connect the gas line (9) using a new seal. In the pro-
cess, secure the gas pipe against twisting.
8. Open the gas isolator cock.
9. Make sure that there are no leaks.
8.10

Draining the product

1. Close the service valves of the product.
2. Open the drain valves on the service valves.
3. Ensure that the automatic air vent cap on the air separ-
ator is open so that the product can be drained fully.
Installation and maintenance instructions ecoTEC plus 0020214491_01
9 8
1
2
3
4
5
6
7