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Siemens
Room temperature controllers
CE1N3036en
Building Technologies
13.10.2008
Functions
The controller acquires the room temperature with its integrated sensor or external
room temperature sensor (QAA32) or external return air temperature sensor (QAH11) –
if used – and maintains the setpoint by delivering control commands. The switching
differential is 1 K.
Q14
T[°C]
ON
OFF
W
SD
30
30
D
0
1
T Room
temperature
SD Switching
differential
W
Room temperature setpoint
Q14
Output signal for heating
The RDE20.1 can provide control either according to the internal room temperature or
according to a remote temperature. The controller detects automatically when a QAH11
is connected. In this case, the internal temperature sensor is deactivated.
Operating modes
The RDE20.1 provides normal operation and, optionally, energy saving mode or OFF.
The difference between normal operation and energy saving mode is only the room
temperature setpoint. The changeover between the operating modes can be made
either automatically according to the 7-day time switch or manually with the operating
mode selector.
When normal operation is activated, symbol “ “ appears on the display. The setpoint
can be readjusted by pressing buttons
+
and
-
.
When energy saving mode is activated, symbol “ “ appears on the display. The set-
point can be readjusted by pressing buttons
+
and
-
.
In energy saving mode, the unit can also be switched to “Off”. This is accomplished by
selecting a setpoint of 5 °C and then keeping button
-
depressed for 4 seconds. In
that case, the “
OFF
“
will appear and the symbol “ “ does not appear.
The changeover between the operating modes can take place either automatically
(
) or manually ( , ), depending on the position of the operating mode selector.
When the operating mode selector is in position “
”, changeover will take automati-
cally according to the selected switching pattern. For every weekday, a specific switch-
ing pattern can be selected.
Factory setting:
Day(s)
Normal operation
Energy saving mode
Mo (1) – Fr (5) 6:00 – 8:00 h and
17:00 – 22:00 h
22:00 – 6:00 h and
08:00 – 17:00 h
Sa (6) – Su (7) 7:00 – 22:00 h
22:00 – 7:00 h
The current setpoint can be temporarily readjusted by pressing
buttons
+
and
-
. The setpoint will then be reset to its initial value the next time auto-
matic or manual changeover takes place.
When the operating mode selector is set to “ “ or “ “, the RDE20.1 will maintain
normal operation or energy saving mode respectively.
Function diagram
Remote temperature
sensor
Normal operation
Energy saving mode
or OFF
7-day time switch
