11.13 Draining The Product; Checking The Admission Pressure Of The Expansion Vessel; Completing Inspection And Maintenance Work; 12 Decommissioning The Product - Vaillant ecoFIT sustain 825 Installation And Maintenance Instructions Manual

12 Decommissioning the product

11.13 Draining the product

1. Close the service valves of the product.
2. Start check programme P.05.
Overview of the check programmes (→ Page 15)
3. Open the drain valves.
11.14 Checking the admission pressure of the
expansion vessel
1. Drain the product. (→ Page 28)
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)
Top up the expansion vessel in accordance with the
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static height of the heating installation, ideally with ni-
trogen, otherwise 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 23).
4. Fill and purge the heating installation. (→ Page 17)
11.15 Completing inspection and maintenance
work
Check the gas flow pressure. (→ Page 18)
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Check the CO₂ content. (→ Page 19)
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If required, reset the maintenance interval.
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(→ Page 38)
Check that the product is leak-tight. (→ Page 19)
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Install the front casing.
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Fill out the relevant Service Record section in the
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Benchmark Checklist located in the rear of this
document.
12 Decommissioning the product
Switch off the product.
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Disconnect the product from the electrical installation.
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Close the gas stopcock.
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Close the cold-water isolation valve.
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Drain the product. (→ Page 28)
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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

14 Recycling and disposal

Disposing of the packaging
Dispose of the packaging correctly.
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Observe all relevant regulations.
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Installation and maintenance instructions ecoFIT sustain 0020230529_04