en
22
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
Thermal disinfection of the upper DHW zone
OTD
Therm. disinfection function
Adjustment range: OFF / ON
Factory setting: OFF
PDIS
Monitoring period
Adjustment range: 0 … 30:0 … 24 h (dd:hh)
Factory setting: 01:00
DDIS
Heating period
Adjustment range:
0:00 … 23:59 (hh:mm)
Factory setting: 01:00
TDIS
Disinfection temperature
Adjustment range: 0 … 95 °C [30 … 200 °F]
Factory setting: 60 °C [140 °F]
This function helps to contain the spread of Legionella in DHW stores by system-
atically activating the backup heating.
For thermal disinfection, the temperature at the reference sensor will be moni-
tored. Protection is ensured when, during the monitoring period, the disinfection
temperature is continuously exceeded for the entire disinfection period.
The monitoring period starts as soon as the temperature at the reference sensor
falls below the disinfection temperature. When the monitoring period ends, the
allocated reference relay activates the backup heating. The disinfection period starts,
if the temperature at the allocated sensor exceeds the disinfection temperature.
Thermal disinfection can only be completed when the disinfection temperature
is exceeded for the duration of the disinfection period without any interruption.
Starting time delay
SDIS
Starting time
Adjustment range: 0:00 … 24:00 (time)
Factory setting: 00:00
If the starting delay option is activated, 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 energised with a delay of 6 hours
at 18:00 instead of 12:00 o'clock.
Note
If the thermal disinfection option is activated, the display channels TDIS,
CDIS, SDIS and DDIS will be displayed.
