Vaillant electronicVED plus - 9 Inspection and Maintenance

18 Installation instructions for the electronicVED plus electric instantaneous water heater 0020149585_00
9 Inspection and maintenance
e
Danger!
Risk of death from electric shock from live
lines and connections!
> Isolate all electrical supplies and connec-
tions from the power supply before carry-
ing out maintenance or repair work.
> Check that there is no voltage in the supply
lines and connections.
> Ensure that the power cannot be restored
inadvertently to any of the supply lines and
connections while you are working on the
unit.
– A functional and visual inspection of the unit must be
carried out every three years by a competent person.
– If the water is very hard, more regular de-scaling may
be necessary.
– If the water has a large volume of suspended matter,
the water filter in the cold water flow must be
replaced more often. At the same time, the water fil-
ter has a sealing function.
Carry out the following actions:
> Replace the water filter in the cold water flow.
> Check for deposits in the hot water pipe between the
heating block and the hot water connection.
> When re-assembling the unit, insert a new flat seal
into the hot water connection.
> Check whether the unit needs to be de-scaled and do
so if required.
i
If the unit needs to be completely de-scaled,
attach a decalcification pump between the
cold and hot water connection.
> After de-scaling the unit, flush it thoroughly with
water.
> After de-scaling the unit, purge it (see section 5).
b
Caution.
Risk of damage caused by leaks.
After changing the water filter in the cold
water flow, leaks may occur due to the new
filter being incorrectly fitted.
> When fitting a new water filter in the cold
water flow, make sure that the filter is cor-
rectly positioned in the pipe and that the
connection is sealed.
9 Inspection and maintenance