User Manual

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Siemens Room Temperature Controllers N3067en
Building Technologies 2014-10-14
Fan operation
The fan operates either in automatic mode or at the selected speed when using manual
mode. In automatic mode, the fan speed depends on the setpoint and the current room
temperature. When the room temperature reaches the setpoint, the control valve will
close and the fan either remains in fan speed 1 or switches off (parameter P21, factory
setting: fan speed 1 in dead zone).
In “Temperature-dependent” fan control the fan switches off (see diagram below). The
individual switching differentials of the fan speeds can be adjusted via control
parameters P08 – P13.
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 using parameter P21 and for Economy
(Energy saving) mode using parameter P20 (only for RDF410…; 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 start (to overcome inertia and friction)
In Auto Timer mode, the default fan mode is automatic. The fan mode can be changed
to manual fan speed. With each changeover from Normal operation to Economy
(Energy saving) mode, or vice versa, the fan will return to default mode automatic.
Ventilation
always on
Dwelling time
Fan start
Fan in Auto Timer
mode (only RDF410…)