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

 
3. Appliance description
This electronically controlled instantaneous water heater with
automatic output matching keeps the outlet temperature constant.
This occurs regardless of the inlet temperature up to the output
limit. The DHW outlet temperature can be freely selected.
The bare wire heating system is suitable for hard and soft water
areas; it has low susceptibility to scale build-up. The heating
system ensures quick and efficient DHW availability.
4. Operation
4.1 Temperature selector
DHB-E ... SLi
30
60
45
35
40
50
55
2602�02�1381
DHB-E ... A
30
50
40
35
45
2602�02�1382
Should the outlet temperature fail to reach the required level with
the draw-off valve fully open and the temperature selector set to
maximum, then more water flows through the appliance than can
be heated by the heating element.
Reduce the flow rate with the draw-off valve.
4.2 Draw-off capacities
Subject to season, varying maximum mixed water or draw-off
capacities result from different cold water temperatures. Further
information can be found in the chapter "Specification".
4.3 Thermostatic valve
We recommend adjusting the appliance to the maximum
temperature setting.
4.4 Temperature limit/Anti-scalding protection
The maximum outlet temperature for the appliance can be limited
to 43°C. Refer in this case to your local heating contractor.
5. Cleaning, care and maintenance
Never use abrasive or corrosive cleaning agents. A damp
cloth is sufficient for cleaning the appliance.
Maintenance work, such as checking the electrical safety, must
only be carried out by a heating contractor.
6. Troubleshooting
!
Material damage
Following an interruption of the water supply,
recommission the appliance by carrying out the following
steps, in order to prevent the destruction of the bare wire
heating system.
Disconnect the appliance from the power supply by
removing the fuses/tripping the MCBs.
Open the tap until the appliance and its upstream
cold water inlet line are free of air.
Switch the mains power back ON again.
  
The appliance will not
start in spite of a fully
open DHW valve.
There is no voltage.
Check the fuse/MCB
in your fuse box/
distribution panel.
Starting volume is not
achieved. The perlator in
the tap or shower head is
scaled up or dirty.
Clean and/or descale the
perlator or the shower
head.
The heating system is
faulty.
Contact your heating
contractor.
The air sensor detects air
in the water and briefly
switches the heater off.
The appliance restarts
automatically after one
minute.
Required temperature
>45 °C is not achieved.
Cold water inlet
temperature is > 45 °C.
Reduce the cold water
inlet temperature.
If you cannot remedy the fault, contact your heating contractor.
For better and faster help, provide him with the serial number
from the type plate (no. 000000-0000-000000):
DHB-E ...
2602�02�0818
4


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