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OPERATION
Appliance description
3.
Appliance description
The appliance heats potable water that flows through it. When
a DHW valve is opened, the heater starts automatically as soon
as the start-up volume has been reached. The heating output
is determined and matched by the flow rate and the cold water
temperature.
Heating system
The bare wire heating system has a pressure-tested plastic casing.
The heating system is suitable for (both) soft and hard water and
is largely resistant to scale build-up. This heating system ensures
rapid and efficient DHW availability.
Note
The appliance is equipped with an air detector that large-
ly prevents damage to the heating system. If, during op-
eration, air is drawn into the appliance, the appliance
shuts down for one minute, thereby protecting the heat-
ing system.
Thermostatic valve
The appliance is suited to operation with a thermostatic valve.
4.
Operation
As soon as the DHW valve at the tap is opened, the heating system
of the appliance automatically starts and the water is heated.
Setting the domestic hot water temperature
Should the outlet temperature fail to reach the required level with
the draw-off valve fully open, then more water flows through the
appliance than can be heated by the heating system.
f Reduce the flow rate with the draw-off valve.
Outlet capacities
Different maximum mixed water volumes/outlet volumes will re-
sult from varying cold water temperatures, depending on the time
of year (see chapter "Installation / Specification / Data table").
Following an interruption to the water supply
See chapter "Installation / Commissioning / Restarting"
5.
Cleaning, care and maintenance
f Never use abrasive or corrosive cleaning agents. A damp
cloth is sufficient for cleaning the appliance.
f Check the taps regularly. Limescale deposits at the tap out-
lets can be removed using commercially available descaling
agents.
18
| HDB-E Si
6.
Troubleshooting
Problem
Cause
The appliance will not
There is no power.
start despite the DHW
valve being fully open.
Starting volume is not
achieved. The aerator
in the tap or the shower
head is scaled up or
dirty.
The water supply has
been interrupted.
Cold water flows briefly
The air sensor detects air
while hot water is being
in the water and briefly
drawn.
switches the heater off.
If you cannot remedy the fault, notify your qualified contractor.
To facilitate and speed up your enquiry, please provide the serial
number from the type plate (000000-0000-000000):
Remedy
Check the fuses/MCBs in
your fuse box/distribu-
tion board.
Clean and/or descale the
aerator or shower head.
Vent the appliance and
the cold water inlet line
(see chapter "Installa-
tion / Commissioning /
Restarting").
The appliance restarts
automatically after
1 minute.
HDB-E ..
Nr.: 000000-0000-000000
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