*****INTERNAL*****30 R_D proof- 26.10.2022 / 09:15:46- VaillantGroup\DOC-agt\Brand\VIH_QW_190_6\ENG\OI-II_GB_0020291525
44 Installation and maintenance instructions 0020291525_04
11.7 Cleaning the domestic hot water cylinder
1. Drain the domestic hot water cylinder.
2. Remove the protection anode from the cylinder.
3. Use a jet of water through the anode opening on the
cylinder to clean the cylinder interior.
4. Rinse sufficiently and allow the water used for cleaning
to flow out via the cylinder drain cock.
5. Close the draining cock.
6. Refit the protection anode to the cylinder.
7. Fill the cylinder with water and check whether it is leak-
tight.
8. Actuate the draining device on the domestic hot water
safety assembly regularly in order to remove any scale
deposition, and ensure that the device is not blocked.
12 Draining
12.1 Draining the product's heating circuit
1. Close the service valves in the heating flow and in the
heating return.
2. Remove the front casing. (→ Section 4.10.1)
3. Remove the side casing. (→ Section 4.10.2)
4. Connect a hose to each of the draining cocks (1) and
(2), and guide the ends of the hoses to a suitable drain-
age point.
5. Use manual actuation to move the prioritising diverter
valve to the "Heating circuit/domestic hot water cylin-
der" position. (→ Section 8.1)
6. Open the automatic air vent (red wheel).
7. After five minutes, open the air vent (3). If required,
close it again if water is escaping.
8. Open the two stopcock in order to fully drain the heat-
ing circuit, including the heating coil for the domestic
hot water cylinder.
12.2 Draining the product's domestic hot water
circuit
1. Unlock the cold water connection.
2. Remove the front casing. (→ Section 4.10.1)
3. Connect a hose to the connection on the draining cock
(1) and route the free end of the hose to a suitable
drainage point.
4. Open the draining cock (1) to fully drain the product's
domestic hot water circuit.
5. Open one of the 3/4 connections on the rear of the
product on the domestic hot water cylinder.
13 Decommissioning
13.1 Decommissioning the product
▶ Disconnect the product from the power grid.
▶ Close the cold-water stopcock.
▶ Close the heating stopcock (flow and return).
▶ Drain the product.
14 Recycling and disposal
Disposing of the packaging
▶ Dispose of the packaging correctly.
▶ Observe all relevant regulations.
Disposing of the product and accessories
▶ Do not dispose of the product or the accessories with
household waste.
▶ Dispose of the product and all accessories correctly.
▶ Observe all relevant regulations.
15 Customer service
Validity: Great Britain AND Vaillant
For contact details for our customer service department, you
can write to the address that is provided on the back page,
or you can visit www.vaillant.co.uk.
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