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Siemens
RDU341 Basic Documentation
CE1P3172en
Building Technologies
2015-06-08
If a time schedule via bus is present, e.g. from central control unit, then the Auto
Timer mode
is active. The thermostat automatically changes between Comfort
and Economy according to the time schedule via bus.
The display shows the Auto Timer mode symbol
along with the symbol for the
effective room operating mode (Comfort
or Economy
).
By pressing the operating mode button, you can change to another operating
mode.
Automatic fan is the default fan speed in Auto Timer mode.
Each time the time schedule sends a new operating mode (switching event), the
operating mode of the thermostat is set back to Auto Timer mode. This is to assure
that the room temperature is maintained according to the time schedule.
If the time schedule sends Precomfort mode, then this mode will be transformed
either into Economy (factory setting) or Comfort (selectable via parameter P88).
No intervention is possible neither by the user nor by an operating mode switch-
over contact, if Protection mode is set by the time schedule. OFF flashes on the
display when the user presses a button.
The operating mode can be selected locally via the operating mode button.
The behavior of the operating mode button (user profile) can be defined via
parameter P02, factory setting is P02 = 1.
P02
Without time
schedule
With time sche-
dule via bus
Description
1
à
à
·
Switching manually between
2
modes, Economy is not
available (factory setting)
·
Suited for hotel guest rooms or commercial buildings.
·
If a time schedule via bus is available, then the Comfort
mode can be temporarily extended (see below)
2
à à
à à à
·
Switching manually between
3
modes
·
Suited for homes and rooms where manual switching to
Economy mode is desired
The thermostat can be forced into Economy mode (e.g. when a window is opened,
when a presence detector signals "no one present", when the keycard of a hotel
room is withdrawn, etc). The contact can be connected to multifunctional input X1,
X2. Set parameter P38, P40 to 3.
If the operating mode switchover contact is active, pressing the operating mode
button will show “OFF” (blinking).
The function is also available via the KNX signal "Window state", e.g. from a KNX
switch or a KNX presence detector.
Note: Only one input source must be used, either local input X1/X2or KNX bus.
User operations are ineffective and “OFF” is displayed if the operating mode
switchover contact is active, or if "Window state" is sent via bus.
Auto Timer mode
with time schedule via
bus
Behavior when bus
sends new operating
mode
Precomfort via bus
Behavior when bus
sends Protection
Availability of Economy
mode
Operating mode
switchover contact
(window contact)
KNX
R
Room operating mode:
Window state
