12.11 Cleaning The Condensate Trap; 12.12 Cleaning The Strainer In The Cold Water Inlet; 12.13 Installing The Compact Thermal Module; 12.14 Draining The Product - Vaillant ecoTEC plus Installation And Maintenance Instructions Manual

12.11 Cleaning the condensate trap

1. Remove the lower section from the condensate trap (1).
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.

12.12 Cleaning the strainer in the cold water inlet

1. Close the cold-water isolation valve.
2. Drain the product on the domestic hot water side (3).
3. Unscrew the union nut (1) from the cold water pipe.
4. Undo the nut (2) on the connector (5).
5. Unscrew the union nut (4).
6. Remove the connector, including the connection pipe
(6).
7. Rinse the connector out under a jet of water in the op-
posite direction to the normal flow.
8. Refit the connector with the cleaned strainer.
9. Always use new seals and retighten the nut and the two
union nuts.
10. Open the cold-water isolation valve.
0020244998_04 ecoTEC plus Installation and maintenance instructions
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12.13 Installing the compact thermal module

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1. Connect the compact thermal module (2) to the heat
exchanger (1).
2. Tighten the four new nuts (8) across the diagonal until
the burner flange fits closely and uniformly onto the
mating surfaces.
–
Tightening torque:6 Nm, if a torque spanner is avail-
able
3. Reconnect the plugs (3) to (7).
4. Connect the gas pipe using a new seal. In the process,
secure the gas pipe against twisting.
5. Open the gas stopcock.
6. Make sure that there are no leaks.
7. Check that the sealing ring in the air intake pipe is posi-
tioned correctly in the seal seat.
8. Reconnect the air intake pipe to the intake stub.
9. Secure the air intake pipe with the retaining screw.
10. Check the gas flow pressure.

12.14 Draining the product

1. Close the service valves of the product.
2. Start the check programme P.06 (prioritising diverter
valve mid-position).
3. Open the drain valves.
4. Make sure that the cap of the automatic air vent on
the internal pump is open so that the product can be
drained fully.
12.15 Checking the pre-charge pressure for
the internal expansion vessel on the heat
generator
1. Close the service valves and drain the product.
2. Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Condition: Pre-charge pressure < 0.075 MPa (0.75 bar)
▶
Ideally, you should top up the expansion vessel with
nitrogen. Otherwise, top it up with air. Ensure that the
drain valve is open when topping up.
3. If water escapes from the valve of the expansion
vessel, you must replace the expansion vessel.
(→ Page 44)
4. Fill the heating installation. (→ Page 31)
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