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9.2
Draining the product
1.
Close the cold water draw-off valve.
2.
Secure a hose to the drain valve.
3.
Position the hose at a suitable drain.
4.
Open the highest hot water tap in the installation.
5.
Open the drain valve and drain the product completely.
6.
Close the hot water tap and the drain valve.
7.
Remove the hose.
9.3
Checking the safety group's expansion
relief valve and the cylinder's expansion
relief valve
1.
Open all expansion relief valves by turning the plug.
2.
Check whether the water is flowing into the tundish.
3.
Check that the expansion relief valves are in the correct
position and then check the pressure.
4.
Check and, if required, clean the pressure reducer.
9.4
Checking the pre-charge pressure of the
expansion vessel
1.
Drain the product. (→ Page 15)
2.
Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Condition: Pressure <0.3 MPa (0.3 bar)
▶
Top up the expansion vessel in accordance with the
static height of the heating installation, ideally with ni-
trogen, otherwise with air.
3.
If water escapes from the valve of the expansion ves-
sel, you must replace the expansion vessel.
4.
Fill and purge the product. (→ Page 14)
10 Decommissioning the product
▶
Switch off the heat generator.
▶
Unplug the domestic hot water cylinder's mains plug.
▶
Close the cold-water stopcock.
▶
Drain the product. (→ Page 15)
▶
Remove the hydraulic connections and the temperature
sensor.
▶
Remove the cables for the temperature sensor from the
heat generator, control or multi-functional module.
11 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
0020221297_05 uniSTOR Installation and maintenance instructions
Decommissioning the product 10
15
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