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Thermal disinfection
This function helps to contain the spread of Legionella in DHW stores by system-
atically activating the afterheating.
For thermal disinfection, the temperature at the allocated sensor has to be mon-
itored. This protection is ensured when, during the monitoring period, the disin-
fection 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 after-
heating. The disinfection period starts to count as soon as the temperature at the
allocated sensor exceeds the disinfection temperature.
If the temperature at the allocated sensor exceeds the disinfection temperature
by more than 5 K, the reference relay switches off until the temperature has fallen
below a value of 2 K above the disinfection 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 fulfi lled by solar loading before the monitor-
ing period ends, thermal disinfection is considered complete and a new monitoring
period begins.
Due to the fl exible control logic, the exact time of thermal disinfection is not
predictable. In order to set a fi xed time for the disinfection, the starting delay can
be used.
Heating / Opt. functions / Add new function... / Th. disinfection
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
Dem.
Demand relay selection
system dependent
system dependent
Circulating
pump
Circulating pump option
Yes, No
No
Relay
Circulating pump relay
selection
system dependent
system dependent
Sensor
Disinfection sensor
selection
system dependent
system dependent
Interval
Monitoring period
0 … 30, 1 … 23 (dd:hh) 1d 0h
Temperature
Disinfection temperature 45 … 90 °C
60 °C
Duration
Disinfection period
0.5 … 24.0 h
1.0 h
Starting time
Starting delay option
Yes, No
No
Starting time
Starting point
00:00 … 23:30
20:00
Funct.
Activation / Deactivation
Activated, Deactivated Deactivated
If the starting delay option Starting time is activated, a starting time for the
thermal disinfection with starting delay can be adjusted. The activation of the after-
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 energised with a delay of 6 hours
at 18:00 instead of 12:00 o’clock.
If, before the delay time has elapsed, the disinfection conditions are fulfi lled by solar
loading, thermal disinfection is considered complete and a new monitoring period
begins.
Summary of Contents for SC5.14
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