Draining The Product; Checking The Pre-Charge Pressure For The Internal Expansion Vessel; Completing Inspection And Maintenance Work; 11 Decommissioning - Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

10.5

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.
10.6 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 29).
4. Fill the heating installation. (→ Page 20)
5. Purge the heating installation. (→ Page 20)
10.7 Completing inspection and maintenance
work
▶
Check the gas flow pressure. (→ Page 21)
▶
Calibrate the heat generator and measure the CO/CO₂
content and the gas flow in heating mode. (→ Page 22)
▶
If required, reset the maintenance interval. (→ Page 30)
▶
Check that the product is leak-tight. (→ Page 23)
▶
Install the front casing.
▶
Fill out the relevant Service Record section in the Bench-
mark Checklist.

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.
0020193966_01 ecoTEC exclusive Installation and maintenance instructions
Decommissioning 11
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 33)

12 Recycling and disposal

Disposing of the packaging
▶
Dispose of the packaging correctly.
▶
Observe all relevant regulations.

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