Cold Water Inlet Pressure; Filling And Purging The Product; Handing The Product Over To The End User; Troubleshooting - Vaillant uniSTOR VIH RW GB 500 BES Installation And Maintenance Instructions Manual

7 Handing the product over to the end user

6.2

Cold water inlet pressure

The product's efficiency depends on the cold water inlet
pressure.
To achieve optimum efficiency, we recommend a pressure of
at least 2 bar.
6.3

Filling and purging the product

Note
It is not permitted to use valves or expansion relief
valves for the purging.
1. Check whether the drain valve is closed.
2. Check whether the inspection flap has been closed
correctly (800 l only).
3. Open the domestic hot water draw-off valves.
4. Open the water supply valve.
5. Open the manual air separator at the top of the cylinder.
6. Let the water flow in order to remove any air bubbles.
7. Close the manual air separator as soon as all of the air
has escaped.
8. Close the domestic hot water draw-off valves.
9. Check whether there are any leaks. Check the immer-
sion heater in particular.
10. Open the highest hot water supply valve, and then the
lowest hot water supply valve, and let the water flow.
– Water running time: ≥ 5 min
11. Close all of the draw-off valves.
7 Handing the product over to the end
user
▶
Once the installation is complete, show the user the loca-
tion and function of the safety devices.
▶
Inform the end user how to handle the product.
▶
In particular, draw attention to the safety warnings which
the end user must follow.
▶
Inform the end user of the necessity to have the product
maintained according to the specified intervals.
8

Troubleshooting

8.1

Detecting and eliminating faults

▶
If problems occur whilst operating the product, check
certain points with the aid of the table in the appendix.
Detecting and eliminating faults (→ Page 16)
14
8.2

Procuring spare parts

The original components of the product were also certified
by the manufacturer as part of the declaration of conformity.
If you use other, non-certified or unauthorised parts during
maintenance or repair work, this may void the conformity of
the product and it will therefore no longer comply with the
applicable standards.
We strongly recommend that you use original spare parts
from the manufacturer as this guarantees fault-free and safe
operation of the product. To receive information about the
available original spare parts, contact the contact address
provided on the back page of these instructions.
▶
If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
9

Inspection and maintenance

9.1 Observing inspection and maintenance
intervals
Adhere to the minimum inspection and maintenance inter-
vals. The inspection may require maintenance to be carried
out earlier, depending on the results.
Inspection and maintenance work – Overview (→ Page 16)
The immersion heater can be removed in order to inspect
the inside of the cylinder.
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 14)
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.
Installation and maintenance instructions uniSTOR 0020235300_03