Wahl Bach 18kW, User Manual, Page: 23 / 28

23
DE GB
The device should be isolated from the electricity supply before any
work is done on live components.
Remove the fuses or isolate the device in another way.
The main water valve should be closed before any work is done on
the water pipe.
If the water supply is interrupted, e.g. due to maintenance on the
mains water supply, then the following steps should be undertaken
before returning the device to operation:
1. Remove the fuses or isolate the device in another way.
2. Open a hot water valve connected to the device until the air is
vented from both the device and the cold water supply pipe.
3. Replace the fuses or reconnect the supply.
4. MAINTENANCE
Maintenance
This device does not require any maintenance by the user. Professional
maintenance may only be carried out by duly authorised technical staff.
Maintenance, e.g. verifying electrical safety, should only be undertaken
by a qualified electrician, observing the relevant regulations (IEEE, etc.).
If faulty, never try to repair the hot water device yourself. Please
contact the nearest service specialist or the party that supplied the
appliance originally.
Care
The enclosure can simply be cleaned with a damp cloth. Do not use aggressive cleaners or
cleaners with a scouring effect!
Descaling
A service inspection should be performed by authorized and qualified technical staff every
year. De-scaling of the device during this inspection is highly recommended, especially when
you live in an area with hard water exceeding 12°dH (German standard of hardness). Higher
water temperature will intensify calcification. It is therefore recommended to set the device
at maximum 55°C (energy-saving setting= „E“ for Hydraulisch in areas with extremely hard
water >16°dH.
Legionella prevention
Do not use heated water as drinking water.
After prolonged shutdown of the device for example due holiday, the device should be fully
heated up to the maximum temperature (tap at minimum flow) before re-using. It is recom-
mended to flush the pipes for one minute.