10.15 Checking The Product For Leak-Tightness; Checking The Admission Pressure Of The Expansion Vessel; Completing Inspection And Maintenance Work; 11 Decommissioning - Vaillant ecoTEC sustain 24 Installation And Maintenance Instructions Manual

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Tightening torque: 6 Nm
3. Reconnect the plugs (1) to (4) and (8).
4. Connect the gas pipe 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.
10. Check the gas flow pressure.

10.15 Checking the product for leak-tightness

▶
Check that the product is leak-tight. (→ Page 22)
10.16 Checking the admission pressure of the
expansion vessel
1. Drain the product. (→ Page 30)
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)
▶
Fill the expansion vessel in accordance with the static
height of the heating installation; ideally with nitrogen,
otherwise with air.
▶
Ensure that the drain valve is open when filling.
3. If water escapes from the valve of the expansion ves-
sel, replace the expansion vessel (→ Page 27).
4. Fill and purge the heating installation. (→ Page 19)
10.17 Completing inspection and maintenance
work
Once you have completed all maintenance work:
▶
Check the CO₂ content. (→ Page 29)
▶
If required, reset (→ Page 23)the maintenance interval.

11 Decommissioning

11.1

Permanently 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 30)

12 Recycling and disposal

Disposing of the packaging
▶
Dispose of the packaging correctly.
▶
Observe all relevant regulations.
0020253094_01 ecoTEC sustain Installation and maintenance instructions
Decommissioning 11

13 Customer service

To ensure regular servicing, it is strongly recommended
that arrangements are made for a Maintenance Agreement.
Please contact Vaillant Service Solutions for further details:
Telephone: 0330 100 3461
33