Instruction of SR81 Split Pressurized Solar Hot Water System
Page 38 of 48
►Press “+/-”, to activate this function, “BLPR ON” displays on the screen
►Press “SET” or “ESC” to save the setting
8.8 OTDI Thermal Sterilization Function
Function description:
This function helps to prevent the spread of Legionella in DHW tanks by systematically
activating the after-heating.
For thermal disinfection, the temperature at the allocated sensor has to be monitored. During
the monitoring period PDIS, this protection ensures the disinfection temperature is
continuously exceeded the disinfection temperature TDIS for the entire disinfection period
DDIS. Thermal disinfection can only be completed when the disinfection temperature is
exceeded for the duration of the disinfection period without any interruption.
The monitoring period PDIS starts as soon as the temperature at the allocated sensor falls
below the disinfection temperature TDIS, once the monitoring period PDIS ends, disinfection
period SDIS starts, and the allocated reference relay activates the after-heating, when tank
temperature exceeds the disinfection temperature, disinfection phase DDIS starts and
disinfection heating time countdowns, countdown finishes, disinfection heating finishes.
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