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Ventilation
always on
Dwelling time
Fan start
Error handling
Temperature out
of range
Control parameters
Parameter settings
4 / 12
Siemens
Building Technologies
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
Valve
Y11
W
Fan
SDH
Q3
Q2
Q1
SDH3
SDH2
SDH
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
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).
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
).
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
Press buttons + and – simultaneously for 3 seconds. Release them and, within
2.
2 seconds, press button + again for 3 seconds. Then, the display will show
"P03".
Select the required parameter by repeatedly pressing buttons + and –:
3.
Semi-flush-mount Room Thermostats with LCD
Cooling mode
Valve
Y11
W
Temp
Fan
SDC
Q3
Q2
Q1
Temp
SDC
SDC2
SDC3
.
Temp
Temp
) using parame-
CB1N3064en
24.08.2010
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