SF1, has reached the adjusted
Disinfection temperature,
provided disinfection has not
been terminated because the
Stop time
has been reached.
The
Hold time of disinfection temperature
determines how long the disinfection temperature
must be maintained within the adjusted time period to rate the process successful. If the
Hold
time of disinfection temperature
is set to a value other than 0, no intermediate heating oper-
ation takes place during thermal disinfection.
If the
Start time
and
Stop time
are set to the identical time, disinfection is controlled depend-
ing on the switching state of the binary input BE17 to be performed daily or on the pro-
grammed day of the week. Disinfection starts when BE17 = ON, or optionally BE17 = OFF.
It stops at the latest when the switching state of the binary input next changes.
When the
Disinfection temperature
has not been reached before the end of the thermal disin-
fection cycle, an “Err 3“ error message is generated. This error message can also be gener-
ated prematurely if the remaining time until the disinfection temperature is reached is shorter
than the adjusted
Hold time of disinfection temperature
. The error message is automatically
reset when the
Disinfection temperature
is properly reached during the following thermal dis-
infection cycle.
Thermal disinfection for preventing legionella infection causes
4
excessively high return flow temperatures during the disinfection cycle (return flow tem-
perature limitation suspended),
4
excessively high DHW 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.
Controllers that are linked over a device bus are subjected to return flow temperature
limitation in the primary control circuit even during the thermal disinfection in a secondary
controller.
EB 5579 EN
93
Functions of the DHW circuit
Summary of Contents for TROVIS 5579
Page 6: ...6 EB 5579 EN...
