54 | KBR..-3A appliances (heating boiler) with DHW tank: Thermal disinfection
Greenstar FS
6 720 810 590 (2015/05)
Fig. 64 Key pad lock
Unlocking the key pad:
▶ Press the key pad lock button until the display shows only the supply
temperature.
9 KBR..-3A appliances (heating boiler) with DHW
tank: Thermal disinfection
Thermal disinfection covers the DHW system including the taps. For
solar DHW tanks, the solar portion of the tank is not covered.
▶ Close all DHW taps.
▶ Advise occupants of the risk of scalding if no tempering valve is
installed.
▶ Set the time and DHW temperature accordingly on the heating
control with DHW program.
▶ Set any DHW recirculation pump to continuous operation.
▶ Turn DHW thermostat clockwise to max (approx. 158 °F (70 °C)).
Fig. 65 Thermal disinfection
▶ Wait until the maximum temperature has been reached.
▶ Open all DHW taps, from the nearest to the one furthest away, and
draw off hot water until it reaches a minimum of 158 °F (70 °C) at all
taps for at least 3 minutes.
▶ Reset the DHW thermostat, DHW recirculation pump, and heating
control to standard operation.
WARNING: Risk of scalding!
Hot water can result in severe scalding.
▶ Carry out thermal disinfection only outside the
normal hours of use, or install a tempering valve.
Thermal disinfection can also be carried out
automatically and on a regular basis; see operating
instructions for the heating control included in the scope
of delivery.
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