Thermal disinfection
7
Condens 8300i W – 6721841534 (2022/05)
3.5 DHW key
3.5.1 Set DHW temperature
WARNING
Hot water can cause severe scalding!
▶ Bear in mind the risk of scalding when changing the maximum DHW
temperature.
▶ Press the DHW key *.
The set DHW temperature is displayed.
▶ Press the or key to set the required DHW temperature
The setting is applied after 5 s or after pressing the OK key.
Measures for hard water
To protect against increased limescale and resulting service work:
If the water is calcareous with a hard hardness range (≥ 15°dH / 27°fH/
2.7 mmol/l)
▶ Set the DHW temperature to less than 55 °C.
3.5.2 Switch off DHW heating
▶ Press the DHW key *.
▶ Press the key until appears on the display.
The setting is applied after 5 s or after pressing the OK key. The
display shows [.
3.6 eco key
Comfort mode (no eco appears in the display)
In comfort mode, the DHW cylinder is reheated when the temperature
differential is 5 K (5 °C) or more.
ECO mode
In ECO mode, the DHW cylinder is reheated when the temperature
differential is 10 K (10 °C) or more.
▶ To set ECO mode, press the eco key.
eco appears on the display.
▶ To return to comfort mode, press the eco key.
eco goes out on the display.
For maximum gas and DHW saving:
▶ Briefly open and close the DHW tap.
The water is heated once to the set temperature.
4 Thermal disinfection
To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
You can program a heating controller with hot water control to perform
thermal disinfection. Alternately, you can have a contractor carry out
thermal disinfection.
CAUTION
Risk of scalding.
During thermal disinfection, discharging unmixed hot water can cause
serious scalding.
▶ Only use the maximum adjustable hot water temperature for thermal
disinfection.
▶ Inform occupants of the premises of the risk of scalding.
▶ Perform thermal disinfection outside of the normal operating times.
▶ Do not discharge DHW unmixed.
Proper thermal disinfection involves the DHW system including the
draw-off points.
▶ Set the thermal disinfection in the hot water program of the heating
controller ( heating controller operating instructions).
▶ Close DHW draw-off points.
▶ Enable continuous operation of any DHW circulation pump that may
be installed.
▶ Once the maximum temperature is reached, open the DHW draw-off
points one by one, starting from the nearest and ending in the
farthest, and draw off DHW until hot water at 70 °C has been
discharging for 3 minutes.
▶ Restore the original settings.
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