Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 10 DHW heating 2017-09-29
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.
This defines the time of day the legionella function shall be started.
It is defined here for what period of time the DHW temperature shall be maintained at
the legionella protection setpoint.
Using setting "On" on operating line Circulating pump operation legio, the circulating pump
will be activated according to the following rule, independent of the pump’s time
program:
In the case of DHW plant types with storage tanks, the circulating pump starts to run as
soon as the storage tank temperature has reached the level of "Legionella protection
setpoint minus switching differential". With direct DHW heating, the circulating pump
always runs when the legionella function is active.
If the circulating pump operates due to its time program, this setting will have no
impact. This means that the setting will activate a stopped pump, but will not deactivate
a running pump.
10.6.3 Legionella function relay
The state of the legionella function can be delivered via a configurable output for further
handling.
The output changes to "On" as soon as the legionella function is started and remains
on until the function is ended.
Setpoints
Legionella protection
setpoint
Legionella setpoint with
consumer control
Various settings
Legionella protection
frequency
Legionella protection time
Legionella protection
period
Legionella protection and
circulating pump