THERMAL DISINFECTION | 29
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8 THERMAL DISINFECTION
8.1 Perform thermal disinfection
General
To prevent Legionella bacterial contamination of the hot water system,
we recommend that a thermal disinfection is performed after a long
period of inactivity.
Some control systems have a preset programmed time interval for
thermal disinfection to be performed, see the operating instructions for
your control system.
Thermal disinfection treats the entire hot water system including the
extraction points.
8.2 Thermal disinfection for system with a hot water tank
Thermal disinfection via external controller
The thermal disinfection is in this case is performed via the external
controller, refer to the controller operating instructions
▶ Turn off all the hot water taps.
▶ Warn the occupants about the potential for scalding.
▶ Set any other pumps for continuous operation.
▶ Activate the Thermal disinfection at the maximum temperature via
the controller.
▶ Wait until the maximum temperature is reached.
▶ Run each hot water taps for at least 3 minutes at 70 °C, starting at the
one nearest to the boiler and working your way to the furthest outlet
▶ Set the circulation pump and control system back to normal
operation.
Thermal disinfection via built in controller
The Thermal disinfection is perform via the built-in controller and is
automatically started and ended.
▶ Turn off all hot water taps
▶ Warn the occupants about the potential for scalding
▶ Set any other pumps for continuous operation
▶ Activate the thermal disinfection via the service function 2.9L see
table 20 on page 35
▶ Wait until the maximum temperature is reached
▶ Run each hot water tap for at least 3 minutes at 70 °C, starting at the
tap nearest to the boiler and working your way to the furthest tap
▶ Set the other circulation pump back to normal operation
▶ Thermal disinfection is completed after the water was maintained at
70 °C for 35 minutes
To interrupt thermal disinfection
▶ Turn the device off and on again.
The appliance returns to normal into operation and the flow temperature
is displayed.
WARNING: Risk of scalding
Hot water can cause serious burns
▶ Perform thermal disinfection outside normal hot
water use times.
Drawing off hot water at too high a rate may mean that
the required temperature can not be achieved.
▶ Draw off only as much water as the appliance can
supply constantly at the disinfection temperature of
70 ° C.
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