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DE GB
4. Maintenance
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 recom-
mended, especially when you live in an area with hard water exceeding 12°dH
(German standard of hardness). Higher water temperature will intensify calcifi-
cation. It is therefore recommended to set the device at maximum 50°C in areas
with extremely hard water >16°dH.
Maintenance
This device does not require any maintenance by the user. Professional mainte-
nance may only be carried out by duly authorized technical staff. Maintenance, e.g.
verifying electrical safety, should only be undertaken by a qualified electrician,
observing the relevant regulations (IEEE, etc.).
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 de-
vice 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.
If faulty, never try to repair the hot water device yourself. Please contact the
nearest service specialist or the party that supplies the appliance originally.
Model Digital 3-in-1
The electronically-regulated continuous-flow water heater with automatic per-
formance adjustment keeps the outflow temperature constant. This takes place
irrespective of the feed temperature, up to the performance limit. User can set
desired max. power (18/21/24kW) by selecting the switch on the main board,
please take Fig. A11 in page. 4 for reference.
The device has touch key to switch it on and off, and +/- keys to adjust the
heating. ”-”: decrease heating performance, “+”: increase heating performance.
Adjust the temperature settings as desired.
Without a temperature limiter, high temperatures may be reached at draw-off
points. Keep children away from the draw-off points.
Danger of scalding!
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.
26


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