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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 10 DHW heating 05.02.2007
During the time the legionella program is active, the circulating pump continues to
operate as preselected.
The circulating pump can be specifically activated to become included in the legionella
function. For that purpose, parameter “Circulating pump operation legio“ is used. If this
parameter is set to “On“, the circulating pump will operate according to characteristic
1
in the graph above. Exception is direct DHW heating (plant type DHW 6). With this type
of plant, the circulating pump always runs, independent of the flow temperature.
If the circulating pump operates due to the preselection made, it will continue to run
during the time the legionella program is performed, independent of the DHW tempera-
ture.
During the time the legionella program is active, function “Charging time limitation“ will
also be active.
The legionella function is monitored to see if it can be successfully completed within 48
hours. Successful means that the legionella protection setpoint (minus switching differ-
ential) could be maintained without interruption, also at the optional sensors (storage
tank sensor at the bottom, consumer’s flow temperature sensor).
If the legionella protection setpoint cannot be maintained, or not for the required period
of time, a fault status message will be delivered:
Number Text Effect
2101 Legionella protection error
Message must be acknowledged.
Error disappears only when the legionella
program has been successfully completed
In the case of a legionella protection error, the legionella program will be aborted and
restarted only when, according to the program, the legionella function will be enabled
the next time.
The following settings have an impact on the legionella function:
The value set is the setpoint for disinfection that shall be maintained during the time the
legionella function is active.
Main menu > DHW > Setpoints
Operating line Range Factory setting
Legionella setpoint 55…140 °C 70 °C
The legionella setpoint for consumer control lies below the legionella setpoint for DHW
heating, the difference being the legionella setpoint reduction.
Main menu > DHW > Setpoints consumers
Operating line Range Factory setting
Legionella setpoint reduction 0…20 K 2 K
Main menu > Settings > DHW > Legionella function
Operating line Range Factory setting
Legionella protection frequency Never / Daily /
Monday…Sunday
Monday
Legionella protection time 00:00…23:59
05:00
Legionella protection period 00.00…06:00 h.min 00.30 h.min
Circulating pump operation legio Off / On On
This defines if and how often the function shall be activated. In the case of a weekly
interval, the required weekday can be selected.
Supervision
Setpoints
Legionella protection
setpoint
Legionella setpoint with
consumer control
Various settings
Legionella protection
frequency
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