Installing The Compact Thermal Module; Draining The Product; Checking The Pre-Charge Pressure For The Internal Expansion Vessel; Completing Inspection And Maintenance Work - Vaillant ecoTEC plus Installation And Maintenance Instructions Manual

3. Unscrew the cap nut (2) and the lock nut (1) from the
product's casing.
4. Tilt the electronics box forward.
5. Remove the clamp (2).
6. Remove the pipe (1) from the product.
7. Rinse the filter under a jet of water, holding it against
the direction of flow.
8. If the filter is damaged or it can no longer be cleaned
sufficiently, you must replace the filter.
9. Refit the pipe.
10. Reinsert the clamp.
11. Always use new seals and retighten the cap nuts and
the lock nut.
12. Open the cold water stop valve.
10.8

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 nuts (8) in a cross-wise pattern until the
burner flange fits closely and uniformly onto the mating
surfaces (if a torque spanner is available, set at 6 Nm).
3. Reconnect the plugs (3) to (7).
4. Connect the gas line using a new seal. In the process,
secure the gas pipe against twisting.
5. Open the gas isolator cock.
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 nozzle.
9. Secure the air intake pipe with the retaining screw.
0020209591_01 ecoTEC plus Installation and maintenance instructions
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Decommissioning 11
10. Check the gas flow pressure.
10.9

Draining the product

1. Close the service valves of the product.
2. Start the check programme P.06 (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.
10.10 Checking the pre-charge pressure for the
internal expansion vessel
1. Close the service valves and drain the product.
2. Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Conditions: 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 33)
4. Fill the heating installation. (→ Page 23)
5. Purge the heating installation. (→ Page 24)
10.11 Completing inspection and maintenance
work
Once you have completed all maintenance work:
▶
Check the gas flow pressure. (→ Page 25)
▶
Check the CO₂ content and, if necessary, adjust it (air
index setting). (→ Page 26)
▶
If required, reset the maintenance interval. (→ Page 28)

11 Decommissioning

11.1

Temporarily decommissioning the product

▶
Press the on/off button.
◁
The display goes out.
▶
Close the gas isolator cock.
▶
For products with hot water generation and products with
a connected domestic hot water cylinder, you must also
close the cold water stop valve.
11.2

Decommissioning the product

▶
Press the on/off button.
◁
The display goes out.
▶
Disconnect the product from the power mains.
▶
Close the gas isolator cock.
▶
Close the cold water stop valve.
▶
Drain the product. (→ Page 37)
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