7.3
Thermal disinfection
(Anl 1 to 3)
In all systems with DHW heating, the DHW storage tank is thermally disinfected on the selected
Day of week or daily. The storage tank is heated up to the adjusted Disinfection temperature.
The charging temperature is always 5 °C higher than the
Disinfection temperature.
Thermal disinfection starts at the adjusted
Start time and finishes at the Stop time at the latest. If
the
Disinfection temperature is not reached at the end of thermal disinfection,
blinks on the
display. The error alarm is automatically reset when the
Disinfection temperature is reached
during the next thermal disinfection.
Thermal disinfection for preventing legionella infection causes
4
high return flow temperatures during the disinfection cycle (return flow temperature limita-
tion suspended),
4
high storage tank temperatures after thermal disinfection has been concluded,
4
lime scale (possibly), which can have a negative effect on heat exchanger performance.
Note!
This function is not available when a storage tank thermostat is used.
Functions
WE
Configuration
Heating circuit with DHW heating
OFF
Co5 -> Fb13 = ON
Storage tank sensor SF1
OFF
Co5 -> Fb03 = ON
Thermal disinfection
OFF
3
70 °C
00:00
04:00
Co4 -> Fb08 = ON
Day of week / 0, 1 to 7 (daily, Mon to Sun)
Disinfection temperature / 50 to 80 °C
Start time / 00:00 to 23:59 h
Stop time / 00:00 to 23:59 h
EB 5474 EN
47
Functions of the DHW circuit
