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Siemens Semi-flush-mount Room Thermostats with LCD CB1N3064en
Building Technologies 24.08.2010
via control parameters P08 and P09. The individual switching differentials of the
fan speed 2 and 3 (Q2 and Q3) are fixed at 1 K.
Heating mode Cooling mode
W
SDH
SDHSDH2SDH3
Valve
Fan
W
SDC
SDC3SDC2SDC
Valve
Fan
Y11Y11
Temp
Temp
Temp
Temp
Q3
Q2
Q1
Q3
Q2
Q1
3058D03
If desired, fan control can be set to “Temperature-independent”, which means that
ventilation is always on, even within the dead zone, using at least fan speed 1. This
can be selected individually for normal operation (Comfort mode ) using parame-
ter P21. Please also refer to “Avoiding damage due to moisture”.
In automatic mode, a dwelling time of 2 minutes (factory setting) is active. The fan
maintains that speed for at least 2 minutes before it switches to the next speed.
This dwelling time can be adjusted from 1…5 minutes using parameter P14.
Whenever the fan starts from standstill, it starts with speed 3 for 1 second in order
to guarantee a safe fan motor starts (to overcome inertia and friction).
Error handling
When the room temperature is out of the measuring range, which means above 49
°C or below 0 °C, the display shows the limiting temperature in flashing figures (“0
°C” or “49 °C”).
If the current setpoint is not OFF (see parameters P03) and the controller is in
heating mode, when the temperature is below 0 °C, output Y11 will be energized.
In all other cases, output Y11 will be de-energized until the temperature returns to
the measuring range, and then the controller will resume Normal operation (Com-
fort mode ).
Control parameters
A number of control parameters can be readjusted to optimize the control perform-
ance. These parameters can also be set during operation without opening the unit.
In the event of a power failure, all control parameter settings will be maintained.
The parameters can be changed as follows:
1. Set the controller to Protection mode .
2. Press buttons + and – simultaneously for 3 seconds. Release them and, within
2 seconds, press button + again for 3 seconds. Then, the display will show
“P03”.
3. Select the required parameter by repeatedly pressing buttons + and –:
Ventilation
always on
Dwelling time
Fan start
Temperature out
of range
Parameter settings
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