STIEBEL ELTRON SOM 10 - Manual (Page 65)

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This function helps to contain the spread of Legio-
nella in DHW stores by systematically activating the
backup heating.
For thermal disinfection, the temperature at the al-
located sensor has to be monitored. This protection
is ensured when, during the monitoring period, the
disinfection temperature is continuously exceeded for
the entire disinfection period.
If the thermal disinfection function is activated, the
monitoring period starts as soon as the temperature
at the allocated sensor falls below the disinfection
temperature. When the monitoring period ends, the
allocated reference relay activates the backup heating.
The disinfection period starts to count as soon as the
temperature at the allocated sensor exceeds the dis-
infection temperature.
If the temperature at the allocated sensor exceeds the
disinfection temperature by more than 5 K [10 °Ra],
the reference relay switches off until the temperature
has fallen below a value of 2 K [4 °Ra], above the dis-
infection temperature.
Thermal disinfection can only be completed when the
disinfection temperature is exceeded for the duration
of the disinfection period without interruption.
If the disinfection conditions have been fulfilled by
solar loading before the monitoring period ends, ther-
mal disinfection is considered complete and a new
monitoring period begins.
Thermal disinfection
Due to the flexible control logic, the exact time of
thermal disinfection is not predictable. In order to set
a fixed time for the disinfection to be run, the starting
delay must be used:
If the starting delay option Starting time is activa-
ted, a starting time for the thermal disinfection with
starting delay can be adjusted. The activation of the
backup heating is then delayed until that starting time
after the monitoring period has ended.
If the monitoring period ends, for example, at 12:00
o'clock, and the starting time has been set to 18:00,
the reference relay will be energized with a delay of 6
hours at 18:00 instead of 12:00 o'clock.
If, during the waiting time, the disinfection conditions
are fulfilled by solar loading, thermal disinfection is
considered complete and a new monitoring period
begins.
Adjustment channel Description Adjustment range / selection Factory setting
Demand Demand relay selection system dependent system dependent
Circulation pump Circulation pump option Yes, No No
Relay Circulation pump relay selection system dependent system dependent
Sensor Disinfection sensor selection system dependent system dependent
Monit. Monitoring period 0 ... 30:1 ... 23 (dd:hh) 01:00 (1 day)
Temperature Disinfection temperature 45 ... 90 °C [114 ... 194 °F] 60 °C [140 °F]
Duration Disinfection period 0.5 ... 24.0 h 1 h
Start. time Starting delay option Yes, No No
Start. time Starting point 00:00 ... 23:30 20:00
Function Activation / Deactivation Activ., Deactivated Deactivated
Heating / Opt. functions / Add new function... / Th. disinfection